Wave-current interaction study in the Gulf of Alaska for detection of eddies by synthetic aperture radar

1994 ◽  
Vol 99 (C5) ◽  
pp. 10075 ◽  
Author(s):  
Antony K. Liu ◽  
Chich Y. Peng ◽  
James D. Schumacher
Keyword(s):  
Synthetic Aperture Radar ◽  
Gulf Of Alaska ◽  
Synthetic Aperture ◽  
Interaction Study ◽  
Current Interaction ◽  
Aperture Radar

scholarly journals A Novel Approach to Marine Wind Speed Assessment Using Synthetic Aperture Radar

2006 ◽  
Vol 21 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Todd D. Sikora ◽  
George S. Young ◽  
Nathaniel S. Winstead
Keyword(s):  
Wind Speed ◽  
Synthetic Aperture Radar ◽  
Wind Direction ◽  
A Priori ◽  
Gulf Of Alaska ◽  
Synthetic Aperture ◽  
A Priori Knowledge ◽  
Direction Field ◽  
Aperture Radar ◽  
Priori Knowledge

Abstract This paper describes a product that allows one to assess the lower and upper bounds on synthetic aperture radar (SAR)-based marine wind speed. The SAR-based wind speed fields of the current research are generated using scatterometry techniques and, thus, depend on a priori knowledge of the wind direction field. The assessment product described here consists of a pair of wind speed images bounding the wind speed range consistent with the observed SAR data. The minimum wind speed field is generated by setting the wind direction field to be directly opposite to the radar look direction. The maximum wind speed field is generated by setting the wind direction field to be perpendicular to the radar look direction. Although the assessment product could be generated using any marine SAR scene, it is expected to be most useful in coastal regions where the large concentration of maritime operations requires accurate, high-resolution wind speed data and when uncertainty in the a priori knowledge of the wind direction precludes the generation of accurate SAR-based wind speed fields. The assessment product is demonstrated using a case in the northern Gulf of Alaska where synoptic-scale and mesoscale meteorological events coexist. The corresponding range of possible SAR-based wind speed is large enough to have operational significance to mariners and weather forecasters. It is recommended that the product become available to the public through an appropriate government outlet.

scholarly journals Use of Synthetic Aperture Radar in Finescale Surface Analysis of Synoptic-Scale Fronts at Sea

2005 ◽  
Vol 20 (3) ◽  
pp. 311-327 ◽  
Author(s):  
G. S. Young ◽  
T. N. Sikora ◽  
N. S. Winstead
Keyword(s):  
North America ◽  
Synthetic Aperture Radar ◽  
East Coast ◽  
Gulf Of Alaska ◽  
Data Sources ◽  
Synthetic Aperture ◽  
Synoptic Scale ◽  
Sar Images ◽  
Cold Fronts ◽  
Aperture Radar

Abstract The viability of synthetic aperture radar (SAR) as a tool for finescale marine meteorological surface analyses of synoptic-scale fronts is demonstrated. In particular, it is shown that SAR can reveal the presence of, and the mesoscale and microscale substructures associated with, synoptic-scale cold fronts, warm fronts, occluded fronts, and secluded fronts. The basis for these findings is the analysis of some 6000 RADARSAT-1 SAR images from the Gulf of Alaska and from off the east coast of North America. This analysis yielded 158 cases of well-defined frontal signatures: 22 warm fronts, 37 cold fronts, 3 stationary fronts, 32 occluded fronts, and 64 secluded fronts. The potential synergies between SAR and a range of other data sources are discussed for representative fronts of each type.

scholarly journals Indian Ocean Crossing Swells: New Insights from “Fireworks” Perspective Using Envisat Advanced Synthetic Aperture Radar

2021 ◽  
Vol 13 (4) ◽  
pp. 670
Author(s):  
He Wang ◽  
Alexis Mouche ◽  
Romain Husson ◽  
Bertrand Chapron
Keyword(s):  
Indian Ocean ◽  
Synthetic Aperture Radar ◽  
Wave Mode ◽  
Ocean Basin ◽  
Synthetic Aperture ◽  
Agulhas Current ◽  
Current Interaction ◽  
The Indian Ocean ◽  
Current Region ◽  
Aperture Radar

Synthetic Aperture Radar (SAR) in wave mode is a powerful sensor for monitoring the swells propagating across ocean basins. Here, we investigate crossing swells in the Indian Ocean using 10-years Envisat SAR wave mode archive spanning from December 2003 to April 2012. Taking the benefit of the unique “fireworks” analysis on SAR observations, we reconstruct the origins and propagating routes that are associated with crossing swell pools in the Indian Ocean. Besides, three different crossing swell mechanisms are discriminated from space by the comparative analysis between results from “fireworks” and original SAR data: (1) in the mid-ocean basin of the Indian Ocean, two remote southern swells form the crossing swell; (2) wave-current interaction; and, (3) co-existence of remote Southern swell and shamal swell contribute to the crossing swells in the Agulhas Current region and the Arabian Sea.

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