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94 results on '"Yardim, Caglar"'

1. CASPER : Coupled Air–Sea Processes and Electromagnetic Ducting Research

Author

Wang, Qing, Alappattu, Denny P., Billingsley, Stephanie, Blomquist, Byron, Burkholder, Robert J., Christman, Adam J., Creegan, Edward D., de Paolo, Tony, Eleuterio, Daniel P., Fernando, Harindra Joseph S., Franklin, Kyle B., Grachev, Andrey A., Haack, Tracy, Hanley, Thomas R., Hocut, Christopher M., Holt, Teddy R., Horgan, Kate, Jonsson, Haflidi H., Hale, Robert A., Kalogiros, John A., Khelif, Djamal, Leo, Laura S., Lind, Richard J., Lozovatsky, Iossif, Planella-Morato, Jesus, Mukherjee, Swagato, Nuss, Wendell A., Pozderac, Jonathan, Rogers, L. Ted, Savelyev, Ivan, Savidge, Dana K., Shearman, R. Kipp, Shen, Lian, Terrill, Eric, Ulate, A. Marcela, Wang, Qi, Wendt, R. Travis, Wiss, Russell, Woods, Roy K., Xu, Luyao, Yamaguchi, Ryan T., and Yardim, Caglar

Published
2018

2. Ice Sheet and Sea Ice Ultrawideband Microwave radiometric Airborne eXperiment (ISSIUMAX) in Antarctica: first results from Terra Nova Bay

Author

Brogioni, Marco, Andrews, Mark J, Urbini, Stefano, Jezek, Kenneth C, Johnson, Joel T, Leduc-Leballeur, Marion, Macelloni, Giovanni, Ackley, Stephen F, Bringer, Alexandra, Brucker, Ludovic, Demir, Oguz, Fontanelli, Giacomo, Yardim, Caglar, Kaleschke, Lars, Montomoli, Francesco, Tsang, Leung, Becagli, Silvia, Frezzotti, Massimo, Brogioni, Marco, Andrews, Mark J, Urbini, Stefano, Jezek, Kenneth C, Johnson, Joel T, Leduc-Leballeur, Marion, Macelloni, Giovanni, Ackley, Stephen F, Bringer, Alexandra, Brucker, Ludovic, Demir, Oguz, Fontanelli, Giacomo, Yardim, Caglar, Kaleschke, Lars, Montomoli, Francesco, Tsang, Leung, Becagli, Silvia, and Frezzotti, Massimo

Abstract

An airborne microwave wide-band radiometer (500-2000 MHz) was operated for the first time in Antarctica to better understand the emission properties of sea ice, outlet glaciers and the interior ice sheet from Terra Nova Bay to Dome C. The different glaciological regimes were revealed to exhibit unique spectral signatures in this portion of the microwave spectrum. Generally, the brightness temperatures over a vertically homogeneous ice sheet are warmest at the lowest frequencies, consistent with models that predict that those channels sensed the deeper, warmer parts of the ice sheet. Vertical heterogeneities in the ice property profiles can alter this basic interpretation of the signal. Spectra along the lengths of outlet glaciers were modulated by the deposition and erosion of snow, driven by strong katabatic winds. Similar to previous experiments in Greenland, the brightness temperatures across the frequency band were low in crevasse areas. Variations in brightness temperature were consistent with spatial changes in sea ice type identified in satellite imagery and in situ ground-penetrating radar data. The results contribute to a better understanding of the utility of microwave wide-band radiometry for cryospheric studies and also advance knowledge of the important physics underlying existing L-band radiometers operating in space.

Published
2023

3. Ice Sheet and Sea Ice Ultrawideband Microwave radiometric Airborne eXperiment (ISSIUMAX) in Antarctica: first results from Terra Nova Bay

Author

Brogioni, Marco, primary, Andrews, Mark J., additional, Urbini, Stefano, additional, Jezek, Kenneth C., additional, Johnson, Joel T., additional, Leduc-Leballeur, Marion, additional, Macelloni, Giovanni, additional, Ackley, Stephen F., additional, Bringer, Alexandra, additional, Brucker, Ludovic, additional, Demir, Oguz, additional, Fontanelli, Giacomo, additional, Yardim, Caglar, additional, Kaleschke, Lars, additional, Montomoli, Francesco, additional, Tsang, Leung, additional, Becagli, Silvia, additional, and Frezzotti, Massimo, additional

Published
2023
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9. Ice Sheet and Sea Ice Ultrawideband Microwave Airborne eXperiment (ISSIUMAX) in Antarctica: first results from Terra Nova Bay

Author

Brogioni, Marco, primary, Andrews, Mark J., additional, Urbini, Stefano, additional, Jezek, Kenneth C., additional, Johnson, Joel T., additional, Leduc-Leballeur, Marion, additional, Macelloni, Giovanni, additional, Ackley, Stephen F., additional, Bringer, Alexandra, additional, Brucker, Ludovic, additional, Demir, Oguz, additional, Fontanelli, Giacomo, additional, Yardim, Caglar, additional, Kaleschke, Lars, additional, Montomoli, Francesco, additional, Tsang, Leung, additional, Becagli, Silvia, additional, and Frezzotti, Massimo, additional

Published
2022
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23. Microwave Radiometry at Frequencies From 500 to 1400 MHz: An Emerging Technology for Earth Observations

Author

Johnson, Joel T, Jezek, Kenneth C, Macelloni, Giovanni, Brogioni, Marco, Tsang, Leung, Dinnat, Emmanuel P, Walker, Jeffrey P, Ye, Nan, Misra, Sidharth, Piepmeier, Jeffrey R, Bindlish, Rajat, LeVine, David M, O'Neill, Peggy E, Kaleschke, Lars, Andrews, Mark J, Yardim, Caglar, Aksoy, Mustafa, Durand, Michael, Chen, Chi-Chih, Demir, Oguz, Bringer, Alexandra, Miller, Julie Z, Brown, Shannon T, Kwok, Ron, Lee, Tong, Kerr, Yann, Entekhabi, Dara, Peng, Jinzheng, Colliander, Andreas, Chan, Steven, MacGregor, Joseph A, Medley, Brooke, DeRoo, Roger, Drinkwater, Mark, Johnson, Joel T, Jezek, Kenneth C, Macelloni, Giovanni, Brogioni, Marco, Tsang, Leung, Dinnat, Emmanuel P, Walker, Jeffrey P, Ye, Nan, Misra, Sidharth, Piepmeier, Jeffrey R, Bindlish, Rajat, LeVine, David M, O'Neill, Peggy E, Kaleschke, Lars, Andrews, Mark J, Yardim, Caglar, Aksoy, Mustafa, Durand, Michael, Chen, Chi-Chih, Demir, Oguz, Bringer, Alexandra, Miller, Julie Z, Brown, Shannon T, Kwok, Ron, Lee, Tong, Kerr, Yann, Entekhabi, Dara, Peng, Jinzheng, Colliander, Andreas, Chan, Steven, MacGregor, Joseph A, Medley, Brooke, DeRoo, Roger, and Drinkwater, Mark

Abstract

icrowave radiometry has provided valuable spaceborne observations of Earth’s geophysical properties for decades. The recent SMOS, Aquarius, and SMAP satellites have demonstrated the value of measurements at 1400 MHz for observ- ing surface soil moisture, sea surface salinity, sea ice thickness, soil freeze/thaw state, and other geophysical variables. However, the information obtained is limited by penetration through the subsur- face at 1400 MHz and by a reduced sensitivity to surface salinity in cold or wind-roughened waters. Recent airborne experiments have shown the potential of brightness temperature measurements from 500–1400 MHz to address these limitations by enabling sensing of soil moisture and sea ice thickness to greater depths, sensing of temperature deep within ice sheets, improved sensing of sea salinity in cold waters, and enhanced sensitivity to soil moisture under veg- etation canopies. However, the absence of significant spectrum re- served for passive microwave measurements in the 500–1400 MHz band requires both an opportunistic sensing strategy and systems for reducing the impact of radio-frequency interference. Here, we summarize the potential advantages and applications of 500–1400 MHz microwave radiometry for Earth observation and review recent experiments and demonstrations of these concepts. We also describe the remaining questions and challenges to be addressed in advancing to future spaceborne operation of this technology along with recommendations for future research activities.

Published
2021

25. Microwave Radiometry at Frequencies From 500 to 1400 MHz: An Emerging Technology for Earth Observations

Author

Johnson, Joel T., primary, Jezek, Kenneth C., additional, Macelloni, Giovanni, additional, Brogioni, Marco, additional, Tsang, Leung, additional, Dinnat, Emmanuel P., additional, Walker, Jeffrey P., additional, Ye, Nan, additional, Misra, Sidharth, additional, Piepmeier, Jeffrey R., additional, Bindlish, Rajat, additional, LeVine, David M., additional, OaNeill, Peggy E., additional, Kaleschke, Lars, additional, Andrews, Mark J., additional, Yardim, Caglar, additional, Aksoy, Mustafa, additional, Durand, Michael, additional, Chen, Chi-Chih, additional, Demir, Oguz, additional, Bringer, Alexandra, additional, Miller, Julie Z., additional, Brown, Shannon T., additional, Kwok, Ron, additional, Lee, Tong, additional, Kerr, Yann, additional, Entekhabi, Dara, additional, Peng, Jinzheng, additional, Colliander, Andreas, additional, Chan, Steven, additional, MacGregor, Joseph A., additional, Medley, Brooke, additional, DeRoo, Roger, additional, and Drinkwater, Mark, additional

Published
2021
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26. ICE SHEET AND SEA ICE ULTRAWIDEBAND MICROWAVE RADIOMETRIC AIRBORNE EXPERIMENT (ISSIUMAX) IN ANTARCTICA: FIRST RESULTS FROM TERRA NOVA BAY.

Author

Brogioni, Marco, Andrews, Mark J., Urbini, Stefano, Jezek, Kenneth C., Johnson, Joel T., Leduc-Leballeur, Marion, Macelloni, Giovanni, Ackley, Stephen F., Bringer, Alexandra, Brucker, Ludovic, Demir, Oguz, Fontanelli, Giacomo, Yardim, Caglar, Kaleschke, Lars, Montomoli, Francesco, Leung Tsang, Becagli, Silvia, and Frezzotti, Massimo

Abstract

An airborne microwave wide-band radiometer (500-2000 MHz) was operated for the first time in Antarctica to better understand the emission properties of sea ice, outlet glaciers and the interior ice sheet from Terra Nova Bay to Dome C. The different glaciological regimes were revealed to exhibit unique spectral signatures in this portion of the microwave spectrum. Generally, the brightness temperatures over the inland ice sheet were warmest at the lowest frequencies consistent with models that predict that those channels sensed the deeper, warmer parts of the ice sheet. Spectra along the lengths of outlet glaciers were modulated by the deposition and erosion of snow, driven by strong katabatic winds. Similar to previous experiments in Greenland, the brightness temperatures across the frequency band were low in crevasse areas. Variations in brightness temperature were consistent with spatial changes in sea ice type identified in satellite imagery and in situ ground penetrating radar data. The results contribute to a better understanding of the utility of microwave wide-band radiometry for cryospheric studies and also advance knowledge of the important physics underlying existing L-band radiometers operating in space. [ABSTRACT FROM AUTHOR]

Published
2022
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33. Measurements of 0.5-2 GHz Thermal Emission Spectra from the Greenland Ice Sheet, Sea Ice, and Permafrost: Results from September 2017 Campaign

Author

Johnson, Joel T., primary, Jezek, Kenneth C., additional, Andrews, Mark, additional, Li, Hongkun, additional, Bringer, Alexandra, additional, Yardim, Caglar, additional, Belgiovane, Domenic, additional, Miller, Julie, additional, Durand, Michael, additional, Duan, Yuna, additional, Macelloni, Giovanni, additional, Brogioni, Marco, additional, Kaleschke, Lars, additional, Tan, Shurun, additional, and Tsang, Leung, additional

Published
2018
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41. 500–2000-MHz Brightness Temperature Spectra of the Northwestern Greenland Ice Sheet

Author

Jezek, Kenneth C., primary, Johnson, Joel T., additional, Tan, Shurun, additional, Tsang, Leung, additional, Andrews, Mark J., additional, Brogioni, Marco, additional, Macelloni, Giovanni, additional, Durand, Michael, additional, Chen, Chi-Chih, additional, Belgiovane, Domenic J., additional, Duan, Yuna, additional, Yardim, Caglar, additional, Li, Hongkun, additional, Bringer, Alexandra, additional, Leuski, Vladimir, additional, and Aksoy, Mustafa, additional

Published
2018
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42. CASPER: Coupled Air-Sea Processes and Electromagnetic Ducting Research

Author

Naval Postgraduate School (U.S.), Meteorology, Wang, Qing, Alappattu, Denny P., Billingsley, Stephanie, Blomquist, Byron, Burkholder, Robert J., Christman, Adam J., Creegan, Edward D., Paolo, Tony De, Eleuterio, Daniel P., Fernando, Harindra Joseph S., Franklin, Kyle B., Grachev, Andrey A., Haack, Tracy, Hanley, Thomas R., Hocut, Christopher M., Holt, Teddy R., Horgan, Kate, Jonsson, Haflidi H., Hale, Robert A., Kalogiros, John A., Khelif, Djamal, Leo, Laura S., Lind, Richard J., Lozovatsky, Iossif, Planella-Morato, Jesus, Mukherjee, Swagato, Nuss, Wendell A., Pozderac, Jonathan, Rogers, L. Ted, Savelyev, Ivan, Savidge, Dana K., Shearman, R. Kipp, Shen, Lian, Terrill, Eric, Ulate, A. Marcela, Wang, Qi, Wendt, R. Travis, Wiss, Russell, Woods, Roy K., Xu, Luyao, Yamaguchi, Ryan T., Yardim, Caglar, Naval Postgraduate School (U.S.), Meteorology, Wang, Qing, Alappattu, Denny P., Billingsley, Stephanie, Blomquist, Byron, Burkholder, Robert J., Christman, Adam J., Creegan, Edward D., Paolo, Tony De, Eleuterio, Daniel P., Fernando, Harindra Joseph S., Franklin, Kyle B., Grachev, Andrey A., Haack, Tracy, Hanley, Thomas R., Hocut, Christopher M., Holt, Teddy R., Horgan, Kate, Jonsson, Haflidi H., Hale, Robert A., Kalogiros, John A., Khelif, Djamal, Leo, Laura S., Lind, Richard J., Lozovatsky, Iossif, Planella-Morato, Jesus, Mukherjee, Swagato, Nuss, Wendell A., Pozderac, Jonathan, Rogers, L. Ted, Savelyev, Ivan, Savidge, Dana K., Shearman, R. Kipp, Shen, Lian, Terrill, Eric, Ulate, A. Marcela, Wang, Qi, Wendt, R. Travis, Wiss, Russell, Woods, Roy K., Xu, Luyao, Yamaguchi, Ryan T., and Yardim, Caglar

Abstract

The objective of CASPER is to improve our capability to characterize the propagation of radio frequency (RF) signals through the marine atmosphere with coordinated efforts in data collection, data analyses, and modeling of the air–sea interaction processes, refractive environment, and RF propagation.

Published
2017

43. The Ultra-Wideband Software Defined Microwave Radiometer (UWBRAD) for Ice sheet subsurface temperature sensing: Calibration and campaign results

Author

Andrews, Mark, primary, Li, Hongkun, additional, Johnson, Joel T., additional, Jezek, Kenneth C., additional, Bringer, Alexandra, additional, Yardim, Caglar, additional, Chen, Chi-Chih, additional, Belgiovane, Domenic, additional, Leuski, Vladimir, additional, Durand, Michael, additional, Duan, Yuna, additional, Macelloni, Giovanni, additional, Brogioni, Marco, additional, Tan, Shurun, additional, and Tsang, Leung, additional

Published
2017
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47. The Ultra-wideband Software-Defined Radiometer (UWBRAD) for ice sheet internal temperature sensing: Results from recent observations

Author

Johnson, Joel T., primary, Jezek, Kenneth C., additional, Aksoy, Mustafa, additional, Bringer, Alexandra, additional, Yardim, Caglar, additional, Andrews, Mark, additional, Chen, Chi-Chih, additional, Belgiovane, Domenic, additional, Leuski, Vladimir, additional, Durand, Michael, additional, Duan, Yuna, additional, Macelloni, Giovanni, additional, Brogioni, Marco, additional, Tan, Shurun, additional, Wang, Tian-Lin, additional, and Tsang, Leung, additional

Published
2016
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