Analysis of island wakes and katabatic winds imaged by RADARSAT-1 synthetic aperture radar

In this study, the sea surface imprints of strong mountain katabatic winds and gap winds are observed on RADARSAT-1 synthetic aperture radar (SAR) ScanSAR wide images off the west coast of the U.S. and in the Gulf of Alaska. Two case studies are presented. In the first case study, a RARASAT-1 SAR scene taken at 14:25:30 UTC on January 21, 2003 shows a finger-like wind pattern that mirrors the coastal mountain height. In the second case, the SAR image was taken at 4:41:45 UTC on December 22, 1999. It shows a strong gap wind and vortex streets through the Aleutian Islands. In order to understand the dynamics of these wind patterns observed in the SAR images, we simulated the low level atmospheric circulation using the fifth-generation Pennsylvania State University (PSU)-National Center for Atmospheric Research (NCAR) Mesoscale Model, MM5. A triple nested-grid (9/3/1 km) technique is employed to achieve a multi-scale simulation. In general the MM5 model captures the wind pattern very well and reveals the dynamics of these meso-scale atmospheric phenomena. However, the MM5 did not resolve the vortex shedding due to the model resolution and the complex nature of this phenomenon

[1]  Xiaofeng Li,et al.  Monitoring Hurricanes Over the Ocean with Wide Swath SAR , 2000 .

[2]  Xiaofeng Li,et al.  The sea surface imprint of island lee waves as observed by RADARSAT synthetic aperture radar , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).

[3]  J. Dudhia.  Numerical Study of Convection Observed during the Winter Monsoon Experiment Using a Mesoscale Two-Dimensional Model , 1989 .

[4]  Paris W. Vachon,et al.  An ERS 1 synthetic aperture radar image of atmospheric lee waves , 1994 .

[5]  Werner Alpers,et al.  Observation of a nonlinear wave disturbance in the marine atmosphere by the synthetic aperture radar aboard the ERS 1 satellite , 1996 .

[6]  D Atlas.  Origin of Storm Footprints on the Sea Seen by Synthetic Aperture Radar , 1994, Science.

[7]  Gad Levy,et al.  Boundary layer roll statistics from SAR , 2001 .

[8]  Paris W. Vachon,et al.  Analysis and modeling of atmospheric gravity waves observed in RADARSAT SAR images , 2000 .

[9]  Paris W. Vachon,et al.  Atmospheric vortex streets on a RADARSAT SAR image , 2000 .

[10]  Feifei Pan,et al.  Gap Winds and Wakes: SAR Observations and Numerical Simulations , 1999 .

[11]  J. Kain,et al.  A Shallow-Convection Parameterization for Mesoscale Models. Part I: Submodel Description and Preliminary Applications. , 2003 .

[12]  Pierre D. Mourad,et al.  Inferring multiscale structure in atmospheric turbulence using satellite-based synthetic aperture radar imagery , 1996 .

[13]  Chung-Ru Ho,et al.  Coastal lee waves on ERS-1 SAR images , 1998 .

[14]  Paris W. Vachon,et al.  Characterization of hurricane eyes in RADARSAT-1 images with wavelet analysis , 2003 .

[15]  W. Alpers,et al.  Atmospheric boundary layer rolls observed by the synthetic aperture radar aboard the ERS-1 satellite , 1994 .

[16]  T. W. Thompson,et al.  Synthetic aperture radar observation of ocean roughness from rolls in an unstable marine boundary layer , 1983 .

[17]  Pierre D. Mourad,et al.  Viewing a cold air outbreak using satellite‐based synthetic aperture radar and advanced very high resolution radiometer imagery , 1996 .

[18]  Werner Alpers,et al.  Katabatic wind fields in coastal areas studied by ERS-1 synthetic aperture radar imagery and numerical modeling , 1998 .

[19]  John S. Kain,et al.  Convective parameterization for mesoscale models : The Kain-Fritsch Scheme , 1993 .

[20]  Da‐Lin Zhang,et al.  A High-Resolution Model of the Planetary Boundary Layer—Sensitivity Tests and Comparisons with SESAME-79 Data , 1982 .

[21]  G. Grell,et al.  A description of the fifth-generation Penn State/NCAR Mesoscale Model (MM5) , 1994 .

[22]  Ola M. Johannessen,et al.  Synthetic aperture radar imaging of upper ocean circulation features and wind fronts , 1991 .