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2. Heparin Binding Protein for the Early Diagnosis and Prognosis of Sepsis in the Emergency Department: The Prompt Multicenter Study

Author

Katsaros, K. Renieris, G. Safarika, A. Adami, E.-M. Gkavogianni, T. Giannikopoulos, G. Solomonidi, N. Halvatzis, S. Koutelidakis, I.M. Tsokos, N. Tritzali, M. Koutoukas, P. Avgoustou, C. Vasishta, A. Giamarellos-Bourboulis, E.J.

Abstract

BACKGROUND: The validation of new biomarkers for the diagnosis and risk stratification of patients with sepsis at an early point is essential for successful treatment. Recent publications prompted us to investigate of heparin binding protein (HBP) for the emergency department (ED) admissions. MATERIALS AND METHODS: In this multicenter, cross-sectional study, HBP and procalcitonin (PCT) were measured within the first hour upon admission to the ED in plasma samples of 371 patients with signs of infection. Patients were classified into non-sepsis and sepsis by the Sepsis-3 definitions and were followed up for outcome. RESULTS: HBP was significantly higher in patients with sepsis and was positively correlated to PCT and C-reactive protein, absolute neutrophil and monocyte counts, creatinine, bilirubin and lactate. Sensitivity, specificity, positive predictive value, and negative predictive value of HBP more than 19.8 ng/mL for the diagnosis of sepsis was 66.3%, 44.9%, 49.3%, and 62.2%, respectively; and for prediction of early death was 100%, 41.0%, 4.5%, and 100%, respectively. Single HBP and PCT could not predict 28-day mortality; this was performed with sensitivity, specificity, positive predictive value, and negative predictive value 44.8%, 81.8%, 17.3%, and 94.6% when used in combination. CONCLUSION: Admission HBP can be used as a tool for the early diagnosis of sepsis and for the risk of early death in the ED. Copyright © 2021 by the Shock Society.

Published
2022

5. Work engagement and job crafting as conditions of ambivalent employees’ adaptation to organizational change

Author

Vakola, M, Petrou, Paraskevas, Katsaros, K, Vakola, M, Petrou, Paraskevas, and Katsaros, K

Abstract

This work focuses on how mixed feelings serve adaptive functions in organizational change. Failing to recognize that attitudes to change may involve both positive and negative evaluations of the change at the same time may affect change implementation. This article explored the relationship between ambivalence to change and adaptive performance in the context of an acquisition using a diary study. We also examined work engagement and job crafting as specific conditions under which ambivalence can lead to adaptive or nonadaptive courses of action. Our results showed that the relationship between ambivalence to change and adaptive performance is positive but not robust. We uncovered two conditions that increase ambivalent employees’ chances to adapt to organizational change: (1) either employees display high work engagement or (2) they display high reducing demands and low seeking resources. Analyses of change recipients’ reactions beyond dichotomous ones and their mechanisms will better inform practitioners and researchers.

Published
2021

11. Study of the air-sea interactions at the mesoscale: the SEMAPHORE experiment

Author

Eymard, L., Planton, S., Durand, P., Le Visage, C., Le Traon, P. Y., Prieur, L., Weill, A., Hauser, D., Rolland, J., Pelon, J., Baudin, F., Bénech, B., Brenguier, J. L., Caniaux, G., De Mey, P., Dombrowski, E., Druilhet, A., Dupuis, H., Ferret, B., Flamant, C., Flamant, P., Hernandez, F., Jourdan, D., Katsaros, K., Lambert, D., Lefèvre, J. M., Le Borgne, P., Le Squere, B., Marsoin, A., Roquet, H., Tournadre, J., Trouillet, V., Tychensky, A., and Zakardjian, B.

Published
1996
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15. A Unified Directional Spectrum for Long and Short Wind-Driven Waves

Author

Elfouhaily, T, Chapron, B, Katsaros, K, and Vandemark, D

Subjects
Oceanography
Abstract

Review of several recent ocean surface wave models finds that while comprehensive in many regards, these spectral models do not satisfy certain additional, but fundamental, criteria. We propose that these criteria include the ability to properly describe diverse fetch conditions and to provide agreement with in situ observations of Cox and Munk [1954] and Jiihne and Riemer [1990] and Hara et al. [1994] data in the high-wavenumber regime. Moreover, we find numerous analytically undesirable aspects such as discontinuities across wavenumber limits, nonphysical tuning or adjustment parameters, and noncentrosymmetric directional spreading functions. This paper describes a two-dimensional wavenumber spectrum valid over all wavenumbers and analytically amenable to usage in electromagnetic models. The two regime model is formulated based on the Joint North Sea Wave Project (JONSWAP) in the long-wave regime and on the work of Phillips [1985] and Kitaigorodskii [1973] at the high wavenumbers. The omnidirectional and wind-dependent spectrum is constructed to agree with past and recent observations including the criteria mentioned above. The key feature of this model is the similarity of description for the high- and low-wavenumber regimes; both forms are posed to stress that the air-sea interaction process of friction between wind and waves (i.e., generalized wave age, u/c) is occurring at all wavelengths simultaneously. This wave age parameterization is the unifying feature of the spectrum. The spectrum's directional spreading function is symmetric about the wind direction and has both wavenumber and wind speed dependence. A ratio method is described that enables comparison of this spreading function with previous noncentrosymmetric forms. Radar data are purposefully excluded from this spectral development. Finally, a test of the spectrum is made by deriving roughness length using the boundary layer model of Kitaigorodskii. Our inference of drag coefficient versus wind speed and wave age shows encouraging agreement with Humidity Exchange Over the Sea (HEXOS) campaign results.

Published
1997

16. Satellite observations of polar lows by SSM/I, Geosat and TOVS

Author

Claud, C, Mognard, N. M, Katsaros, K. B, Chedin, A, and Scott, N. A

Subjects
Spacecraft Instrumentation
Abstract

Satellite observations in high-latitude regions were used to detect polar lows and track their propagation and evolution. The Special Sensor Microwave/Imager (SSM/I) provided estimates of surface wind speed, integrated cloud liquid water, and water vapor contents over ocean; the Geosat radar altimeter measured surface wind speed and significant wave height; the TIROS-N Operational Vertical Sounder (TOVS) allowed the determination of temperature and humidity profiles in the atmosphere, as well as cloud information (cloud top pressure and temperature). The detection of polar lows at a very early stage, and their development, propagation, and decay is presented for a specific case occurring in the Norwegian Sea on 23-24 January 1988, using a combination of these three instruments, namely a passive and an active microwave sensor, and a vertical sounder (19 infrared, 1 visible, and 4 microwave channels). Advantage is taken of the time and coverage differences between these three satellite sensors for the observation of polar lows. A discussion of the results is given.

Published
1991

21. RADARSAT-1 Hurricane Watch

Author

Vachon, P W, primary, Black, P, additional, Dodge, P, additional, Katsaros, K, additional, Clemente-Colon, P, additional, Pichel, W, additional, and MacDonell, K, additional

Published
2001
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22. RADARSAT-1 SAR for Hurricane Watch

Author

Vachon, P W, primary, Black, P, additional, Dodge, P, additional, Katsaros, K, additional, Clemente-Colon, P, additional, Pichel, W, additional, and MacDonell, K, additional

Published
2001
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25. SDN/NFV-based end to end network slicing for 5G multi-tenant networks

Author

K. Chartsias, P., primary, Amiras, A., additional, Plevrakis, I., additional, Samaras, I., additional, Katsaros, K., additional, Kritharidis, D., additional, Trouva, E., additional, Angelopoulos, I., additional, Kourtis, A., additional, Siddiqui, M.S., additional, Vines, A., additional, and Escalona, E., additional

Published
2017
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27. Hierarchical, virtualised and distributed intelligence 5G architecture for low-latency and secure applications

Author

Siddiqui, M.S., primary, Legarrea, A., additional, Escalona, E., additional, Parker, M.C., additional, Koczian, G., additional, Walker, S.D., additional, Lyberopoulos, G., additional, Theodoropoulou, E., additional, Filis, K., additional, Foglar, A., additional, Ulbricht, M., additional, Liu, Y., additional, Point, J.C., additional, Trouva, E., additional, Rokkas, Th., additional, Neokosmidis, I., additional, Kritharidis, D., additional, Katsaros, K., additional, Spirou, S., additional, Habel, K., additional, Jungnickel, V., additional, Canales, C., additional, and Lorenzo, M., additional

Published
2016
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28. CLWPR - A novel cross-layer optimized position based routing protocol for VANETs

Author

Katsaros K., Dianati M., Tafazolli R., and Kernchen R.

Subjects
ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS
Abstract

In this paper, we propose a novel position-based routing protocol designed to anticipate the characteristics of an urban VANET environment. The proposed algorithm utilizes the prediction of the node's position and navigation information to improve the efficiency of routing protocol in a vehicular network. In addition, we use the information about link layer quality in terms of SNIR and MAC frame error rate to further improve the efficiency of the proposed routing protocol. This in particular helps to decrease end-to-end delay. Finally, carry-n-forward mechanism is employed as a repair strategy in sparse networks. It is shown that use of this technique increases packet delivery ratio, but increases end-to-end delay as well and is not recommended for QoS constraint services. Our results suggest that compared with GPSR, our proposal demonstrates better performance in the urban environment. © 2011 IEEE.

Published
2011

30. Heart rate variability in advanced chronic kidney disease with or without diabetes: Midterm effects of the initiation of chronic haemodialysis therapy

Author

Mylonopoulou, M. Tentolouris, N. Antonopoulos, S. Mikros, S. Katsaros, K. Melidonis, A. Sevastos, N. Katsilambros, N.

Abstract

Background. Previous studies in different clinical settings have established heart rate variability (HRV) as a significant independent risk factor for higher mortality and cardiac death. The aim of this study was to examine the effect of chronic haemodialysis therapy on time- and frequencydomain parameters of HRV in diabetic and non-diabetic patients with chronic kidney disease (CKD). Methods. We studied 25 patients with stage 4 CKD and type 2 diabetes mellitus (CKD4+DM), 25 patients with stage 4 CKD without diabetes (CKD4), 25 patients with type 2 diabetes mellitus (DM) and 25 healthy subjects (HS). The study was performed in two phases. In the first phase, a 24-h Holter electrocardiographic (ECG) monitoring was performed in all subjects. The patients with stage 4 CKD were followed up until they progressed to stage 5, and in the second phase of the study, they underwent a 24-h Holter ECG monitoring after completion of 3months of conventional haemodialysis treatment. Results. In the first phase of the study, a reduction in cardiac sympathetic activity in CKD4 patients (significantly lower SDNN, SDANN/5 min, SD and VLF vs. HS) and worse autonomic function in CKD4+DMpatients (significantly lower SDNN, SDANN/5 min, SD, VLFand LF/HF) vs. HS,DM and CKD4 was observed. After 3 months of dialysis therapy, the patients with CKD+DM showed a significant improvement only in the time-domain parameter SDANN/5 min, while the time-domain parameters SDNN, SDANN/5 min and SD were improved in CKD patients without diabetes. Frequency-domain parameters of HRV remained unchanged in both groups. Conclusions. CKD is associated with worse cardiac autonomic function. Haemodialysis therapy for 3 months improves some indices of HRV, and this effect is more pronounced in non-diabetic subjects. Our findings suggest that the improvement of HRVafter the initiation of chronic dialysis therapy can ameliorate clinical outcomes and survival in patients with end-stage renal disease. © The Author 2010.

Published
2010

32. The prognostic significance of atrial arrhythmias recorded early after cardioversion for atrial fibrillation

Author

Maounis, T Kyrozi, E Katsaros, K Bilianou, E Vassilikos, VP Manolis, AS Cokkinos, D

Subjects
cardiovascular system, cardiovascular diseases
Abstract

In a substantial number of patients, AF recurs after successful electrical cardioversion. The purpose of this study was to investigate if the atrial arrhythmias recorded immediately after cardioversion are associated with the risk of recurrence of the arrhythmia and to compare the prognostic significance of this parameter with that of other established risk factors. In a series of 71 patients, the risk factors for recurrence of AF during the first year after successful electrical cardioversion were analyzed. A new parameter that was investigated was the frequency of atrial premature beats and the presence of runs of supraventricular tachycardia in the Holter recording started immediately after the cardioversion. Age, left atrial size, left ventricular systolic function, duration of the arrhythmia before cardioversion, underlying cardiac disease, or medication taken were not found to be predictive of recurrence of the arrhythmia. However, the natural logarithm of the number of atrial premature complexes per hour of the Holter recording in the 37 patients in whom AF recurred was higher compared to that of the 34 patients who maintained sinus rhythm (P < 0.0005). The same was true if only the first 6 hours of the recording were analyzed (P < 0.0005). There was a trend for more frequent arrhythmia recurrence if runs of supraventricular tachycardia were present. The finding of > 10 atrial premature complexes per hour in the recording had a relative risk of 2.57 (1.51-4.37), a positive predictive accuracy of 76.5%, and a negative predictive accuracy of 70.3% for subsequent arrhythmia recurrence. We can conclude that frequent (> 10/hour) atrial premature complexes in the Holter recording after electrical cardioversion for AF is a significant risk factor for recurrence of the arrhythmia.

Published
2001

35. Design challenges of open spectrum access

Author

Katsaros, K. V., Frangoudis, P. A., Polyzos, G. C., Karlsson, Gunnar, Katsaros, K. V., Frangoudis, P. A., Polyzos, G. C., and Karlsson, Gunnar

Abstract

The use of licensed spectrum for wireless communication is driven by the need to control interference between different operators. However, with this mode of regulation, spectrum utilization is far from efficient and the growth of wireless networks is hindered by the shortage of free frequency bands and the vast investments for the acquisition of a license. In view of this situation, we present an alternative evolution path for the unobstructed growth of wireless networks and the efficient use of spectrum. The proposed architecture is based on the use of unlicensed spectrum and the open access of users to all public networks without prior contracts with operators. We highlight and discuss the inherent technical challenges that must be tackled before the proposed solution can be realized. Special attention is paid to the inherent need for alternative interference mitigation strategies., QC 20110708

Published
2008
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36. Air-sea exchange of water vapor and sensible heat: The humidity exchange over the sea (HEXOS) results

Author

Decosmo, J., Katsaros, K. B., Smith, S. D., Oost, W. A., Bumke, Karl, and Chadwick, H.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics::Atmospheric and Oceanic Physics
Abstract

Surface layer fluxes of sensible heat and water vapor were measured from a fixed platform in the North Sea during the Humidity Exchange over the Sea (HEXOS) Main Experiment (HEXMAX). Eddy wind stress and other relevant atmospheric and oceanic parameters were measured simultaneously and are used to interpret the heat and water vapor flux results. One of the main goals of the HEXOS program was to find accurate empirical heat and water vapor flux parameterization formulas for high wind conditions over the sea. It had been postulated that breaking waves and sea spray, which dominate the air-sea interface at high wind speeds, would significantly affect the air-sea heat and water vapor exchange for wind speeds above 15 m/s. Water vapor flux has been measured at wind speeds up to 18 m/s, sufficient to test these predictions, and sensible heat flux was measured at wind speeds up to 23 m/s. Within experimental error, the HEXMAX data do not show significant variation of the flux exchange coefficients with wind speed, indicating that modification of the models is needed. Roughness lengths for heat and water vapor derived from these direct flux measurements are slightly lower in value but closely parallel the decreasing trend with increasing wind speed predicted by the surface renewal model of Liu et al. [1979], created for lower wind speed regimes, which does not include effects of wave breaking. This suggests that either wave breaking does not significantly affect the surface layer fluxes for the wind speed range in the HEXMAX data, or that a compensating negative feedback process is at work in the lower atmosphere. The implication of the feedback hypothesis is that the moisture gained in the lower atmosphere from evaporation of sea spray over rough seas may be largely offset by decreased vapor flux from the air-sea interface.

Published
1996

38. Saturday, 17 July 2010

Author

Dimova, I., primary, Hlushchuk, R., additional, Makanya, A., additional, Djonov, V., additional, Theurl, M., additional, Schgoer, W., additional, Albrecht, K., additional, Beer, A., additional, Patsch, J. R., additional, Schratzberger, P., additional, Mahata, S., additional, Kirchmair, R., additional, Didie, M., additional, Christalla, P., additional, Rau, T., additional, Eschenhagen, T., additional, Schumacher, U., additional, Lin, Q., additional, Zenke, M., additional, Zimmmermann, W., additional, Hoch, M., additional, Fischer, P., additional, Stapel, B., additional, Missol-Kolka, E., additional, Erschow, S., additional, Scherr, M., additional, Drexler, H., additional, Hilfiker-Kleiner, D., additional, Diebold, I., additional, Petry, A., additional, Kennel, P., additional, Djordjevic, T., additional, Hess, J., additional, Goerlach, A., additional, Castellano, J., additional, Aledo, R., additional, Sendra, J., additional, Costales, P., additional, Badimon, L., additional, Llorente-Cortes, V., additional, Dworatzek, E., additional, Mahmoodzadeh, S., additional, Regitz-Zagrosek, V., additional, Posa, A., additional, Varga, C., additional, Berko, A., additional, Veszelka, M., additional, Szablics, P., additional, Vari, B., additional, Pavo, I., additional, Laszlo, F., additional, Brandenburger, M., additional, Wenzel, J., additional, Bogdan, R., additional, Richardt, D., additional, Reppel, M., additional, Hescheler, J., additional, Terlau, H., additional, Dendorfer, A., additional, Heijman, J., additional, Rudy, Y., additional, Westra, R., additional, Volders, P., additional, Rasmusson, R., additional, Bondarenko, V., additional, Ertas Gokhan, M. D., additional, Ural Ertan, M. D., additional, Karaoz Erdal, P. H. D., additional, Aksoy Ayca, P. H. D., additional, Kilic Teoman, M. D., additional, Kozdag Guliz, M. D., additional, Vural Ahmet, M. D., additional, Ural Dilek, M. D., additional, Poulet, C., additional, Christ, T., additional, Wettwer, E., additional, Ravens, U., additional, Van Der Pouw Kraan, C., additional, Schirmer, S., additional, Fledderus, J., additional, Moerland, P., additional, Leyen, T., additional, Piek, J., additional, Van Royen, N., additional, Horrevoets, A., additional, Fleissner, F., additional, Jazbutyte, V., additional, Fiedler, J., additional, Galuppo, P., additional, Mayr, M., additional, Ertl, G., additional, Bauersachs, J., additional, Thum, T., additional, Protze, S., additional, Bussek, A., additional, Li, F., additional, Hoo, R., additional, Lam, K., additional, Xu, A., additional, Subramanian, P., additional, Karshovska, E., additional, Megens, R., additional, Akhtar, S., additional, Heyll, K., additional, Jansen, Y., additional, Weber, C., additional, Schober, A., additional, Zafeiriou, M., additional, Noack, C., additional, Renger, A., additional, Dietz, R., additional, Zelarayan, L., additional, Bergmann, M., additional, Meln, I., additional, Malashicheva, A., additional, Anisimov, S., additional, Kalinina, N., additional, Sysoeva, V., additional, Zaritskey, A., additional, Barbuti, A., additional, Scavone, A., additional, Mazzocchi, N., additional, Crespi, A., additional, Capilupo, D., additional, Difrancesco, D., additional, Qian, L., additional, Shim, W., additional, Gu, Y., additional, Mohammed, S., additional, Wong, P., additional, Zafiriou, M., additional, Schaeffer, H., additional, Kovacs, P., additional, Simon, J., additional, Varro, A., additional, Athias, P., additional, Wolf, J., additional, Bouchot, O., additional, Vandroux, D., additional, Mathe, A., additional, De Carvalho, A., additional, Laurent, G., additional, Rainer, P., additional, Huber, M., additional, Edelmann, F., additional, Stojakovic, T., additional, Trantina-Yates, A., additional, Trauner, M., additional, Pieske, B., additional, Von Lewinski, D., additional, De Jong, A., additional, Maass, A., additional, Oberdorf-Maass, S., additional, Van Gelder, I., additional, Lin, Y., additional, Li, J., additional, Wang, F., additional, He, Y., additional, Li, X., additional, Xu, H., additional, Yang, X., additional, Coppini, R., additional, Ferrantini, C., additional, Ferrara, C., additional, Rossi, A., additional, Mugelli, A., additional, Poggesi, C., additional, Cerbai, E., additional, Rozmaritsa, N., additional, Voigt, N., additional, Dobrev, D., additional, Kienitz, M.-C., additional, Zoidl, G., additional, Bender, K., additional, Pott, L., additional, Kohajda, Z., additional, Kristof, A., additional, Virag, L., additional, Jost, N., additional, Trafford, A., additional, Prnjavorac, B., additional, Mujaric, E., additional, Jukic, J., additional, Abduzaimovic, K., additional, Brack, K., additional, Patel, V., additional, Coote, J., additional, Ng, G., additional, Wilders, R., additional, Van Ginneken, A., additional, Verkerk, A., additional, Xaplanteris, P., additional, Vlachopoulos, C., additional, Baou, K., additional, Vassiliadou, C., additional, Dima, I., additional, Ioakeimidis, N., additional, Stefanadis, C., additional, Ruifrok, W., additional, Qian, C., additional, Sillje, H., additional, Van Goor, H., additional, Van Veldhuisen, D., additional, Van Gilst, W., additional, De Boer, R., additional, Schmidt, K., additional, Kaiser, F., additional, Erdmann, J., additional, De Wit, C., additional, Barnett, O., additional, Kyyak, Y., additional, Cesana, F., additional, Boffi, L., additional, Mauri, T., additional, Alloni, M., additional, Betelli, M., additional, Nava, S., additional, Giannattasio, C., additional, Mancia, G., additional, Vilskersts, R., additional, Kuka, J., additional, Svalbe, B., additional, Liepinsh, E., additional, Dambrova, M., additional, Zakrzewicz, A., additional, Maroski, J., additional, Vorderwuelbecke, B., additional, Fiedorowicz, K., additional, Da Silva-Azevedo, L., additional, Pries, A., additional, Gryglewska, B., additional, Necki, M., additional, Zelawski, M., additional, Grodzicki, T., additional, Scoditti, E., additional, Massaro, M., additional, Carluccio, M., additional, Distante, A., additional, Storelli, C., additional, De Caterina, R., additional, Kocgirli, O., additional, Valcaccia, S., additional, Dao, V., additional, Suvorava, T., additional, Kumpf, S., additional, Floeren, M., additional, Oppermann, M., additional, Kojda, G., additional, Leo, C., additional, Ziogas, J., additional, Favaloro, J., additional, Woodman, O., additional, Goettsch, W., additional, Marton, A., additional, Goettsch, C., additional, Morawietz, H., additional, Khalifa, E., additional, Ashour, Z., additional, Rupprecht, V., additional, Scalera, F., additional, Martens-Lobenhoffer, J., additional, Bode-Boeger, S., additional, Li, W., additional, Kwan, Y., additional, Leung, G., additional, Patella, F., additional, Mercatanti, A., additional, Pitto, L., additional, Rainaldi, G., additional, Tsimafeyeu, I., additional, Tishova, Y., additional, Wynn, N., additional, Kalinchenko, S., additional, Clemente Lorenzo, M., additional, Grande, M., additional, Barriocanal, F., additional, Aparicio, M., additional, Martin, A., additional, Hernandez, J., additional, Lopez Novoa, J., additional, Martin Luengo, C., additional, Kurlianskaya, A., additional, Denisevich, T., additional, Barth, N., additional, Loot, A., additional, Fleming, I., additional, Wang, Y., additional, Gabrielsen, A., additional, Ripa, R., additional, Jorgensen, E., additional, Kastrup, J., additional, Arderiu, G., additional, Pena, E., additional, Kobus, K., additional, Czyszek, J., additional, Kozlowska-Wiechowska, A., additional, Milkiewicz, P., additional, Milkiewicz, M., additional, Madonna, R., additional, Montebello, E., additional, Geng, Y., additional, Chin-Dusting, J., additional, Michell, D., additional, Skilton, M., additional, Dixon, J., additional, Dart, A., additional, Moore, X., additional, Ehrbar, M., additional, Reichmuth, P., additional, Heinimann, N., additional, Hewing, B., additional, Stangl, V., additional, Stangl, K., additional, Laule, M., additional, Baumann, G., additional, Ludwig, A., additional, Widmer-Teske, R., additional, Mueller, A., additional, Stieger, P., additional, Tillmanns, H., additional, Braun-Dullaeus, R., additional, Sedding, D., additional, Troidl, K., additional, Eller, L., additional, Benli, I., additional, Apfelbeck, H., additional, Schierling, W., additional, Troidl, C., additional, Schaper, W., additional, Schmitz-Rixen, T., additional, Hinkel, R., additional, Trenkwalder, T., additional, Pfosser, A., additional, Globisch, F., additional, Stachel, G., additional, Lebherz, C., additional, Bock-Marquette, I., additional, Kupatt, C., additional, Seyler, C., additional, Duthil-Straub, E., additional, Zitron, E., additional, Scholz, E., additional, Thomas, D., additional, Gierten, J., additional, Karle, C., additional, Fink, R., additional, Padro, T., additional, Lugano, R., additional, Garcia-Arguinzonis, M., additional, Schuchardt, M., additional, Pruefer, J., additional, Toelle, M., additional, Pruefer, N., additional, Jankowski, V., additional, Jankowski, J., additional, Zidek, W., additional, Van Der Giet, M., additional, Fransen, P., additional, Van Hove, C., additional, Michiels, C., additional, Van Langen, J., additional, Bult, H., additional, Quarck, R., additional, Wynants, M., additional, Alfaro-Moreno, E., additional, Rosario Sepulveda, M., additional, Wuytack, F., additional, Van Raemdonck, D., additional, Meyns, B., additional, Delcroix, M., additional, Christofi, F., additional, Wijetunge, S., additional, Sever, P., additional, Hughes, A., additional, Ohanian, J., additional, Forman, S., additional, Ohanian, V., additional, Gibbons, C., additional, Vernia, S., additional, Das, A., additional, Shah, V., additional, Casado, M., additional, Bielenberg, W., additional, Daniel, J., additional, Daniel, J.-M., additional, Hersemeyer, K., additional, Schmidt-Woell, T., additional, Kaetzel, D., additional, Tillmans, H., additional, Kanse, S., additional, Tuncay, E., additional, Kandilci, H., additional, Zeydanli, E., additional, Sozmen, N., additional, Akman, D., additional, Yildirim, S., additional, Turan, B., additional, Nagy, N., additional, Acsai, K., additional, Farkas, A., additional, Papp, J., additional, Toth, A., additional, Viero, C., additional, Mason, S., additional, Williams, A., additional, Marston, S., additional, Stuckey, D., additional, Dyer, E., additional, Song, W., additional, El Kadri, M., additional, Hart, G., additional, Hussain, M., additional, Faltinova, A., additional, Gaburjakova, J., additional, Urbanikova, L., additional, Hajduk, M., additional, Tomaskova, B., additional, Antalik, M., additional, Zahradnikova, A., additional, Steinwascher, P., additional, Jaquet, K., additional, Muegge, A., additional, Wang, G., additional, Zhang, M., additional, Tesi, C., additional, Ter Keurs, H., additional, Kettlewell, S., additional, Smith, G., additional, Workman, A., additional, Lenaerts, I., additional, Holemans, P., additional, Sokolow, S., additional, Schurmans, S., additional, Herchuelz, A., additional, Sipido, K., additional, Antoons, G., additional, Wehrens, X., additional, Li, N., additional, Respress, J. R., additional, De Almeida, A., additional, Van Oort, R., additional, Lohmann, H., additional, Saes, M., additional, Messer, A., additional, Copeland, O., additional, Leung, M., additional, Matthes, F., additional, Steinbrecher, J., additional, Salinas-Riester, G., additional, Opitz, L., additional, Hasenfuss, G., additional, Lehnart, S., additional, Caracciolo, G., additional, Eleid, M., additional, Carerj, S., additional, Chandrasekaran, K., additional, Khandheria, B., additional, Sengupta, P., additional, Riaz, I., additional, Tyng, L., additional, Dou, Y., additional, Seymour, A., additional, Dyer, C., additional, Griffin, S., additional, Haswell, S., additional, Greenman, J., additional, Yasushige, S., additional, Amorim, P., additional, Nguyen, T., additional, Schwarzer, M., additional, Mohr, F., additional, Doenst, T., additional, Popin Sanja, S., additional, Lalosevic, D., additional, Capo, I., additional, Momcilov Popin, T., additional, Astvatsatryan, A., additional, Senan, 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Tedeschi, L., additional, Trivella, M., additional, Citti, L., additional, Chen, B., additional, Ma, Y., additional, Yang, Y., additional, Ma, X., additional, Liu, F., additional, Hasanzad, M., additional, Rejali, L., additional, Fathi, M., additional, Minassian, A., additional, Mohammad Hassani, R., additional, Najafi, A., additional, Sarzaeem, M., additional, Sezavar, S., additional, Akhmedov, A., additional, Klingenberg, R., additional, Yonekawa, K., additional, Lohmann, C., additional, Gay, S., additional, Maier, W., additional, Neithard, M., additional, Luescher, T., additional, Xie, X., additional, Fu, Z., additional, Kevorkov, A., additional, Verduci, L., additional, Cremisi, F., additional, Wonnerth, A., additional, Katsaros, K., additional, Zorn, G., additional, Weiss, T., additional, De Rosa, R., additional, Galasso, G., additional, Piscione, F., additional, Santulli, G., additional, Iaccarino, G., additional, Piccolo, R., additional, Luciano, R., additional, Chiariello, M., additional, Szymanski, M., additional, Schoemaker, R., additional, Hillege, H., additional, Rizzo, S., additional, Basso, C., additional, Thiene, G., additional, Valente, M., additional, Rickelt, S., additional, Franke, W., additional, Bartoloni, G., additional, Bianca, S., additional, Giurato, E., additional, Barone, C., additional, Ettore, G., additional, Bianca, I., additional, Eftekhari, P., additional, Wallukat, G., additional, Bekel, A., additional, Heinrich, F., additional, Fu, M., additional, Briedert, M., additional, Briand, J., additional, Roegel, J., additional, Pilichou, K., additional, Korkmaz, S., additional, Radovits, T., additional, Pali, S., additional, Hirschberg, K., additional, Zoellner, S., additional, Loganathan, S., additional, Karck, M., additional, Szabo, G., additional, Pucci, A., additional, Pantaleo, J., additional, Martino, S., additional, Pelosi, G., additional, Matteucci, M., additional, Kusmic, C., additional, Vesentini, N., additional, Piccolomini, F., additional, Viglione, F., additional, L'abbate, A., additional, Slavikova, J., additional, Chottova Dvorakova, M., additional, Kummer, W., additional, Campanile, A., additional, Spinelli, L., additional, Ciccarelli, M., additional, De Gennaro, S., additional, Assante Di Panzillo, E., additional, Trimarco, B., additional, Akbarzadeh Najar, R., additional, Ghaderian, S., additional, Tabatabaei Panah, A., additional, Vakili, H., additional, Rezaei Farimani, A., additional, Rezaie, G., additional, Beigi Harchegani, A., additional, Hamdani, N., additional, Gavina, C., additional, Van Der Velden, J., additional, Niessen, H., additional, Stienen, G., additional, Paulus, W., additional, Moura, C., additional, Lamego, I., additional, Eloy, C., additional, Areias, J., additional, Bonda, T., additional, Dziemidowicz, M., additional, Hirnle, T., additional, Dmitruk, I., additional, Kaminski, K., additional, Musial, W., additional, Winnicka, M., additional, Villar, A., additional, Merino, D., additional, Ares, M., additional, Pilar, F., additional, Valdizan, E., additional, Hurle, M., additional, Nistal, J., additional, Vera, V., additional, Karuppasamy, P., additional, Chaubey, S., additional, Dew, T., additional, Sherwood, R., additional, Desai, J., additional, John, L., additional, Marber, M., additional, Kunst, G., additional, Cipolletta, E., additional, Attanasio, A., additional, Del Giudice, C., additional, Campiglia, P., additional, Illario, M., additional, Berezin, A., additional, Koretskaya, E., additional, Bishop, E., additional, Fearon, I., additional, Heger, J., additional, Warga, B., additional, Abdallah, Y., additional, Meyering, B., additional, Schlueter, K., additional, Piper, H., additional, Euler, G., additional, Lavorgna, A., additional, Cecchetti, S., additional, Rio, T., additional, Coluzzi, G., additional, Carrozza, C., additional, Conti, E., additional, Andreotti, F., additional, Glavatskiy, A., additional, Uz, O., additional, Kardesoglu, E., additional, Yiginer, O., additional, Bas, S., additional, Ipcioglu, O., additional, Ozmen, N., additional, Aparci, M., additional, Cingozbay, B., additional, Ivanes, F., additional, Hillaert, M., additional, Susen, S., additional, Mouquet, F., additional, Doevendans, P., additional, Jude, B., additional, Montalescot, G., additional, Van Belle, E., additional, Castellani, C., additional, Angelini, A., additional, De Boer, O., additional, Van Der Loos, C., additional, Gerosa, G., additional, Van Der Wal, A., additional, Dumitriu, I., additional, Baruah, P., additional, Kaski, J., additional, Maytham, O., additional, D Smith, J., additional, Rose, M., additional, Cappelletti, A., additional, Pessina, A., additional, Mazzavillani, M., additional, Calori, G., additional, Margonato, A., additional, Cassese, S., additional, D'anna, C., additional, Leo, A., additional, Silenzi, A., additional, Baca', M., additional, Biasucci, L., additional, Baller, D., additional, Gleichmann, U., additional, 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D., additional, Sanden, E., additional, Xi, C., additional, Sundset, R., additional, Ytrehus, K., additional, Bliksoen, M., additional, Rutkovskiy, A., additional, Mariero, L., additional, Vaage, I., additional, Stenslokken, K., additional, Pisarenko, O., additional, Shulzhenko, V., additional, Studneva, I., additional, Serebryakova, L., additional, Tskitishvili, O., additional, Pelogeykina, Y., additional, Timoshin, A., additional, Vanin, A., additional, Ziberna, L., additional, Lunder, M., additional, Drevensek, G., additional, Passamonti, S., additional, Gorza, L., additional, Ravara, B., additional, Scapin, C., additional, Vitadello, M., additional, Zigrino, F., additional, Gwathmey, J., additional, Del Monte, F., additional, Vilahur, G., additional, Juan-Babot, O., additional, Onate, B., additional, Casani, L., additional, Lemoine, S., additional, Calmettes, G., additional, Jaspard-Vinassa, B., additional, Duplaa, C., additional, Couffinhal, T., additional, Diolez, P., additional, Dos Santos, P., additional, Fusco, A., additional, Sorriento, D., additional, Cervero, P., additional, Feliciello, A., additional, Barnucz, E., additional, Kozichova, K., additional, Hlavackova, M., additional, Neckar, J., additional, Kolar, F., additional, Novakova, O., additional, Novak, F., additional, Barsanti, C., additional, Abraham, N., additional, Muntean, D., additional, Mirica, S., additional, Duicu, O., additional, Raducan, A., additional, Hancu, M., additional, Fira-Mladinescu, O., additional, Ordodi, V., additional, Voelkl, J., additional, Haubner, B., additional, Neely, G., additional, Moriell, C., additional, Seidl, S., additional, Pachinger, O., additional, Penninger, J., additional, and Metzler, B., additional

Published
2010
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42. Experimental investigation of the dependence of radar backscattering on wind speed, wind stress and wave height

Author

Gogineni, S. P and Katsaros, K. B

Subjects
Oceanography
Abstract

During summer 1988, radar measurements were performed in conjunction with detailed environmental observations on Lake Washington at the University of Washington Sand Point field station. Radar data were collected at 5.3 and 10 GHz for incidence angles between 30 and 60 deg with VV-polarization. The environmental measurements included wind speed and direction, large-wave heights, the high-frequency portion of the wave spectrum, humidity, and air and water temperatures. The small-scale wave spectrum was measured using a resistance wire gauge. The results show that backscatter increased with wind speed as expected. However, little difference was observed in the scattering coefficient for upwind and crosswind directions. The results also indicated an increase in the amplitude of small waves with friction velocity.

Published
1989

43. Intrinsic frequency spectra of short gravity-capillary waves obtained from temporal measurements of wave height on a lake

Author

Atakturk, S. S and Katsaros, K. B

Subjects
Oceanography
Abstract

Intrinsic frequency spectra of water waves in the range of 6-17 Hz were obtained as a function of both wind speed and wind stress from point measurements of wave height. In a lake with a limited fetch, there are two types of surface motions causing Doppler shift in the frequencies of short waves: orbital velocity of long waves and surface wind drift. The former was estimated from long-wave amplitude by using a linear wave theory. The error in this estimate is of the order of the long-wave slope, and for this work it is typically 10 percent. The latter was approximated by the friction velocity. The friction velocity could be either taken as 3 percent of the mean wind speed measured at a height of 10 m or obtained from direct measurements of the wind stress. The surface drift velocities obtained by these two approaches were found to be in close agreement. Doppler frequency shift can be corrected in either the frequency or the equivalent spatial domain. The two techniques were found to produce comparable results. Experimental results showed that the spectral energy of short waves rapidly increased in response to increasing winds and jumped up by an order of magnitude when wave breaking occurred.

Published
1987

44. Variation of the drag coefficient and its dependence on sea state

Author

Geernaert, G. L, Katsaros, K. B, and Richter, K

Subjects
Oceanography
Abstract

Using a Gill propeller vane anemometer and resistance wave wires over a water column depth of 15 m, simultaneous measurements of the momentum flux and sea surface wave spectra were acquired from the Pisa mast, 28 km offshore in the German Bight during autumn and winter 1979. These data were analyzed to identify the relationship between wind stress and surface waves. It was found that wind stresses for wind speeds above 15 m/s were regularly higher than open ocean wind stresses as reported by Smith (1980) and by Large and Pond (1981) for the same mean wind speed. These results, when described in terms of the drag coefficient, compared closely with the results of Sheppard et al. (1972), who collected surface layer statistics over Lough Neagh, Northern Ireland. After modeling the surface waves of the North Sea as a function of wave saturation (or wave age), it became evident that variations in the magnitude of the drag coefficient could be explained by coincident variations in the surface wave energy spectrum. By applying the wave dependent roughness length model described by Kitaigorodskii (1973), the North Sea drag coefficient was predicted to be larger than drag coefficients reported from the open sea.

Published
1986

45. Mesoscale and synoptic scale features of North Pacific weather systems observed with the scanning multichannel microwave radiometer on Nimbus 7

Author

Katsaros, K. B and Lewis, R. M

Subjects
Meteorology And Climatology
Abstract

Employing data on integrated atmospheric water vapor, total cloud liquid water and rain rate obtainable from the Nimbus 7 Scanning Multichannel Microwave Radiometer (SMMR), the frontal structure of several mid-latitude cyclones over the North Pacific Ocean as they approach the West Coast of North America in the winter of 1979. The fronts, analyzed with all available independent data, are consistently located at the leading edge of the strongest gradient in integrated water vapor. The cloud liquid water content, which unfortunately has received very little in situ verification, has patterns which are consistent with the structure seen in visible and infrared imagery. The rain distribution is also a good indicator of frontal location and rain amounts are generally within a factor of two of what is observed with rain gauges on the coast. Furthermore, the onset of rain on the coast can often be accurately forecast by simple advection of the SMMR observed rain areas.

Published
1986

46. Atmospheric water distribution in a midlatitude cyclone observed by the Seasat Scanning Multichannel Microwave Radiometer

Author

Mcmurdie, L. A and Katsaros, K. B

Subjects
Meteorology And Climatology
Abstract

Patterns in the horizontal distribution of integrated water vapor, integrated liquid water and rainfall rate derived from the Seasat Scanning Multichannel Microwave Radiometer (SMMR) during a September 10-12, 1978 North Pacific cyclone are studied. These patterns are compared with surface analyses, ship reports, radiosonde data, and GOES-West infrared satellite imagery. The SMMR data give a unique view of the large mesoscale structure of a midlatitude cyclone. The water vapor distribution is found to have characteristic patterns related to the location of the surface fronts throughout the development of the cyclone. An example is given to illustrate that SMMR data could significantly improve frontal analysis over data-sparse oceanic regions. The distribution of integrated liquid water agrees qualitatively well with corresponding cloud patterns in satellite imagery and appears to provide a means to distinguish where liquid water clouds exist under a cirrus shield. Ship reports of rainfall intensity agree qualitatively very well with SMMR-derived rainrates. Areas of mesoscale rainfall, on the order of 50 km x 50 km or greater are detected using SMMR derived rainrates.

Published
1985
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48. Spatial variation of sea surface temperature and flux-related parameters measured from aircraft in the JASIN experiment

Author

Liu, W. T and Katsaros, K. B

Subjects
Oceanography
Abstract

Spatial variation of some parameters measured on two aircraft flying 100-km box and 200-km triangular patterns at low levels in the atmospheric boundary layer during the Joint Air Sea Interaction Experiment in the North Atlantic was studied. The variation should be representative of summer conditions in mid-latitude oceans. The variance density of remotely sensed sea surface temperature, corrected for sky reflection, is found to depend on the one-dimensional wave number raised to the power of approximately -5/3. Nonuniform clouds add low-frequency variance to observations of a downward looking radiometer and result in steeper slope of the spectra of uncorrected sea surface temperature. Turbulent fluxes of momentum, sensible heat, and moisture were determined with the bulk formulae from the parameters (wind speed, temperature, specific humidity, and sea surface temperature) measured from the aircraft. The averages of these fluxes over each flight leg were compared with the fluxes determined from the parameters averaged over the same leg. The difference is negligible, showing that spatially averaged observations, such as those from spaceborne sensors, can be used in the bulk formulae to evaluate the fluxes.

Published
1984

49. Studies of Atmospheric Water in Storms with the Nimbus 7 Scanning Multichannel Microwave Radiometer

Author

Katsaros, K. B

Subjects
Meteorology And Climatology
Abstract

The new tools for the study of midlattitude cyclones by atmospheric water channels of the scanning multichannel microwave radiometer (SMMR) on Nimbus 7, were discussed. The integrated atmospheric water vapor, total cloud liquid water and rain data were obtained from the Nimbus 7 Scanning Multichannel Microwave Radiometer (SMMR). The frontal structure of several midlattitude cyclones over the North Pacific Ocean as they approached the West Coast of North America were studied. It is found that fronts are consistently located at the leading edge of the strongest gradient in integrated water vapor. The cloud liquid water content has patterns which are consistent with the structure seen in visible and infrared imagery. The rain distribution is a good indicator of frontal location. It is concluded that the onset of rain on the coast can be forecast accurately by simple advection of the SMMR observed rain areas.

Published
1984

50. A summary of results from the first Nimbus 7 SMMR observations

Author

Gloersen, P, Cavalieri, D. J, Wilheit, T. T, Chang, A. T. C, Campbell, W. J, Johannessen, O. M, Katsaros, K. B, Kunzi, K. F, Ross, D. B, and Staelin, D

Subjects
Geosciences (General)
Abstract

Selected data obtained during the first year of operation of the scanning multichannel microwave radiometer (SMMR) on board the Nimbus 7 satellite (launched in late October 1978) have been used to calculate, on a global basis, various geophysical parameters over open oceans, polar regions, and terrain. Over open oceans these calculations have provided values for sea surface temperatures, near-surface winds, atmospheric water vapor in a column, and rainfall rates. In polar regions, sea ice concentration, multiyear ice fraction, and radiating temperatures have been obtained. Finally, the extent and water equivalence of snow cover over terrain have been calculated. These parameters have been compared with in situ measurements of the same geophysical parameters, where available, and the results of these comparisons are described. The self-consistency of the global displays of all the parameters is discussed along with the plans for archiving them for subsequent research purposes. A description of the SMMR calibration and data processing scheme is also given.

Published
1984

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