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Werner Alpers, Andrei Yu. Ivanov, and Knut-Frode Dagestad

1. Introduction At least since 1978, when the first spaceborne synthetic aperture radar (SAR) images became available from the American Seasat satellite, it has been known that SAR can sense finescale features of the near-surface wind field. But only in the last few years have robust algorithms been developed, which can be used operationally to retrieve near-surface wind fields from SAR images acquired of the ocean. The aim of this paper is to draw the attention of modelers to spaceborne SAR

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Ernani de Lima Nascimento, Gerhard Held, and Ana Maria Gomes

configuration in 2005 it completed a full set of plan position indicators (PPIs) at 11 elevations every 7.5 min when in volume scan mode. The beamwidth is 2°, and the range resolution is 1 km. Postprocessing of the clutter-filtered radar data was conducted using the storm tracking algorithm Thunderstorm Identification, Tracking, Analysis and Nowcasting (TITAN; Dixon and Wiener 1993 ). Data from the National Centers for Environmental Prediction’s Climate Forecast System Reanalysis (NCEP CFSR; Saha et al

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Andreas Dörnbrack, Sonja Gisinger, Michael C. Pitts, Lamont R. Poole, and Marion Maturilli

cloud observations: Second-generation detection algorithm and composition discrimination . Atmos. Chem. Phys. , 9 , 7577 – 7589 , doi: 10.5194/acp-9-7577-2009 . 10.5194/acp-9-7577-2009 Pitts , M. C. , L. R. Poole , A. Dörnbrack , and L. W. Thomason , 2011 : The 2009–2010 Arctic polar stratospheric cloud season: A CALIPSO perspective . Atmos. Chem. Phys. , 11 , 2161 – 2177 , doi: 10.5194/acp-11-2161-2011 . 10.5194/acp-11-2161-2011 Pitts , M. C. , L. R. Poole , A. Lambert

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John P. Monteverdi, Roger Edwards, and Gregory J. Stumpf

: The National Severe Storms Laboratory mesocyclone detection algorithm for the WSR-88D . Wea. Forecasting , 13 , 304 – 326 , doi: 10.1175/1520-0434(1998)013<0304:TNSSLM>2.0.CO;2 . Thompson , R. L. , R. Edwards , J. A. Hart , K. L. Elmore , and P. Markowski , 2003 : Close proximity soundings within supercell environments obtained from the Rapid Update Cycle . Wea. Forecasting , 18 , 1243 – 1261 , doi: 10.1175/1520-0434(2003)018<1243:CPSWSE>2.0.CO;2 . Weisman , M. L. , and J. B

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