{"id":51902,"date":"2023-04-23T23:59:00","date_gmt":"2023-04-23T23:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=51902"},"modified":"2023-04-24T14:33:24","modified_gmt":"2023-04-24T14:33:24","slug":"sar-data-views-of-the-north-wall-of-the-gulf-stream","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/51902","title":{"rendered":"SAR data views of the North Wall of the Gulf Stream"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225025.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1137\" height=\"751\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225025.png\" alt=\"\" class=\"wp-image-51903\" srcset=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225025.png 1137w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225025-300x198.png 300w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225025-1024x676.png 1024w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225025-768x507.png 768w\" sizes=\"auto, (max-width: 1137px) 100vw, 1137px\" \/><\/a><figcaption class=\"wp-element-caption\">GOES-16 Level 2 Sea-Surface Temperature, 2300 UTC on 23 April 2023 with Sentinel-1A SAR Winds at 2250 UTC (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p>Sentinel-1A&#8217;s overpass just east of North Carolina right after sunset on 23 April 2023, above, shows a sharp delineation in wind speeds, with wind speeds at the western edge of the SAR winds dropping from around 8-9 knots (cyan enhancement) to 2-3 knots (magenta enhancement).  The animation below includes the SAR footprints north and south of the footprint shown above &#8212; taken within 1 second of each other.  There are multiple features in the SAR data that have underlying signals in the SST field.  The warmth of the sea surface here is affecting the wind strength;  stability changes will change the amount of vertical mixing after all.  The North Wall is also apparent in the <a href=\"https:\/\/www.star.nesdis.noaa.gov\/socd\/mecb\/sar\/AKDEMO_products\/APL_winds\/wind_images2\/2023-04\/S1A_ESA_2023_04_23_22_50_25_0735605425_072.79W_36.69N_VV_C_nrcs.png\">Normalized Radar Cross Section (NRCS) data<\/a> (from <a href=\"https:\/\/www.star.nesdis.noaa.gov\/socd\/mecb\/sar\/AKDEMO_products\/APL_winds\/wind_images2\/sarwinds_daily_rcs.html?date=20230423\">this site<\/a>).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225000_225025_225050_step.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1137\" height=\"751\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16SST-20230423_225000_225025_225050_step.gif\" alt=\"\" class=\"wp-image-51905\"\/><\/a><figcaption class=\"wp-element-caption\">GOES-16 Level 2 Sea-Surface Temperature, 2300 UTC on 23 April 2023 with Sentinel-1A SAR Winds at 22:50:00, 22:50:25 and 22:50:50 UTC (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>The toggle below shows the SAR data overlain on top of GOES-16 Shortwave Infrared (Band 7, 3.9 \u00b5m) imagery.  A cleaner view of the temperature gradients is apparent.  The SST Level 2 product shown above is computed only in regions that are confidently cloud-free.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1137\" height=\"751\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/S1A_G16Band07-20230423_225025_toggle.gif\" alt=\"\" class=\"wp-image-51907\"\/><figcaption class=\"wp-element-caption\">GOES-16 Shortwave Infrared imagery (Band 7, 3.9 \u00b5m) with\/without observations of Sentinel-1A SAR winds, 2250 UTC on 23 April 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><a href=\"https:\/\/ovl.oceandatalab.com\/?date=1682078400000&amp;timespan=1d&amp;extent=-16871276.73941_2117649.9622003_-3173761.2726136_9367549.2199835&amp;center=-10022519.006012_5742599.5910919&amp;zoom=4&amp;products=3857_SAR_roughness&amp;opacity=100&amp;stackLevel=100.02&amp;selection=1\">This European Space Agency SAR Data viewer<\/a> will give you hours of SAR data viewing pleasure (in addition to <a href=\"https:\/\/www.star.nesdis.noaa.gov\/socd\/mecb\/sar\/AKDEMO_products\/APL_winds\/wind_images2\/sarwinds_daily_rcs.html\">this NOAA\/STAR link<\/a>!)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sentinel-1A&#8217;s overpass just east of North Carolina right after sunset on 23 April 2023, above, shows a sharp delineation in wind speeds, with wind speeds at the western edge of the SAR winds dropping from around 8-9 knots (cyan enhancement) to 2-3 knots (magenta enhancement). The animation below includes the SAR footprints north and south [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":51908,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10,74,104,25],"tags":[],"class_list":["post-51902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-interpretation","category-goes-16","category-sar","category-satellite-winds"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/51902","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=51902"}],"version-history":[{"count":2,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/51902\/revisions"}],"predecessor-version":[{"id":51909,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/51902\/revisions\/51909"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/51908"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=51902"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=51902"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=51902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}