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19 results on '"Khalsa S. J."'

1. Report on International Spaceborne Imaging Spectroscopy Technical Committee Calibration and Validation Workshop, National Environment Research Council Field Spectroscopy Facility, University of Edinburgh

Author

Ong, C, Mueller, A, Thome, K, Bachmann, M, Czapla-Myers, J, Holzwarth, S, Khalsa, S. J, Maclellan, C, Malthus, T, Nightingale, J, Pierce, L, and Yamamoto, H

Subjects
Earth Resources And Remote Sensing
Abstract

Calibration and validation are fundamental for obtaining quantitative information from Earth Observation (EO) sensor data. Recognising this and the impending launch of at least five sensors in the next five years, the International Spaceborne Imaging Spectroscopy Technical Committee instigated a calibration and validation initiative. A workshop was conducted recently as part of this initiative with the objective of establishing a good practice framework for radiometric and spectral calibration and validation in support of spaceborne imaging spectroscopy missions. This paper presents the outcomes and recommendations for future work arising from the workshop.

Published
2016
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3. Air-sea fluxes and surface layer turbulence around a sea surface temperature front

Author

Friehe, C. A, Shaw, W. J, Davidson, K. L, Rogers, D. P, Large, W. G, Stage, S. A, Crescenti, G. H, Khalsa, S. J. S, Greenhut, G. K, and Li, F

Subjects
Meteorology And Climatology
Abstract

The observed effects of sharp changes in sea surface temperature (SST) on the air-sea fluxes, surface roughness, and the turbulence structure in the surface layer and the marine atmospheric boundary layer are discussed. In situ flux and turbulence observations were carried out from three aircraft and two ships within the FASINEX framework. Three other aircraft used remote sensors to measure waves, microwave backscatter, and lidar signatures of cloud tops. Descriptions of the techniques, intercomparison of aircraft and ship flux data, and use of different methods for analyzing the fluxes from the aircraft data are described. Changing synoptic weather on three successive days yielded cases of wind direction both approximately parallel and perpendicular to a surface temperature front. For the wind perpendicular to the front, wind over both cold-to-warm and warm-to-cold surface temperatures occurred. Model results consistent with the observations suggest that an internal boundary layer forms at the SST.

Published
1991

10. Rapid ASTER imaging facilitates timely assessment of glacier hazards and disasters

Author

Kääb, A, Wessels, R, Haeberli, W, Huggel, C, Kargel, J S, Khalsa, S J S, Kääb, A, Wessels, R, Haeberli, W, Huggel, C, Kargel, J S, and Khalsa, S J S

Abstract

Glacier- and permafrost-related hazards increasingly threaten human lives, settlements, and infrastructure in high-mountain regions. Present atmospheric warming particularly affects terrestrial systems where surface and sub-surface ice are involved. Changes in glacier and permafrost equilibrium are shifting beyond historical knowledge. Human settlement and activities are extending toward danger zones in the cryospheric system. A number of recent glacier hazards and disasters underscore these trends. Difficult site access and the need for fast data acquisition make satellite remote sensing of crucial importance in high-mountain hazard management and disaster mapping.

Published
2003

13. BUILDING ON THE INTERNATIONAL POLAR YEAR: DISCOVERING INTERDISCIPLINARY DATA THROUGH FEDERATED SEARCH.

Author

Yarmey, L. and Khalsa, S. J.

Subjects
INTERNATIONAL Polar Year, 2007-2008, ACCESS to information, METADATA, INTERNET, POLAR research
Abstract

The legacy of the International Polar Year 2007–2008 (IPY) includes advances in open data and meaningful progress towards interoperability of data, systems, and standards. Enabled by metadata brokering technologies and by the growing adoption of international metadata standards, federated data search welcomes diversity in Arctic data and recognizes the value of expertise in community data repositories. Federated search enables specialized data holdings to be discovered by broader audiences and complements the role of metadata registries such as the Global Change Master Directory, providing interoperability across the Arctic web-of-repositories. [ABSTRACT FROM AUTHOR]

Published
2014
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14. Medium- to large-scale atmospheric variability during the Frontal Air-Sea Interaction Experiment

Author

Naval Postgraduate School (U.S.), Department of Meteorology, Davidson, K. L., Boyle, P. J., Gautier, C., Hanson, H. P., Khalsa, S. J. S., Naval Postgraduate School (U.S.), Department of Meteorology, Davidson, K. L., Boyle, P. J., Gautier, C., Hanson, H. P., and Khalsa, S. J. S.

Abstract

Shipboard, aircraft and satellite atmospheric data are examined to determine the representativeness of the Frontal Air-Sea Interaction Experiment (FASINEX) intensive measurement period. Phase II, in terms of climatology, atmospheric forcing, the general structure of the marine atmospheric boundary layer (MABL), and variability in boundary layer properties affecting air-ocean dynamics and thermodynamics. With regard to climatology, conditions observed during the intensive period were typical in terms of air-sea temperature differences, surface pressure patterns, cloud cover, and storm tracks. Storm system variabilities, such as the air temperature behind cold fronts, wind stress maxima occurring after frontal passage, the times for clockwise vector wind shifts associated with the frontal systems, and the systems' speeds, are estimated and emphasized in synoptic-scale characterizations, since these can be related to observed ocean responses. The local ocean surface variability was observed to have an influence on regional boundary layer properties and on air-sea interaction parameters even in the presence of the atmospheric storms.

Published
1991

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