{"id":56616,"date":"2024-01-22T20:59:00","date_gmt":"2024-01-22T20:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=56616"},"modified":"2024-01-23T23:42:14","modified_gmt":"2024-01-23T23:42:14","slug":"opening-of-the-kivalliq-polynya-in-western-hudson-bay","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/56616","title":{"rendered":"Opening of the Kivalliq Polynya in northwestern Hudson Bay"},"content":{"rendered":"

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NOAA-20 VIIRS Day\/Night Band (0.7 \u00b5m) and Infrared Window (11.45 \u00b5m) images, valid at 0827 UTC [click to enlarge]<\/p><\/div>A toggle between NOAA-20 VIIRS Day\/Night Band and Infrared Window images valid at 0827 UTC (2:27 AM local time) on 22 January 2024 (above)<\/strong><\/em> showed an opening of the Kivalliq Polynya<\/strong><\/a> along the northwest coast of Hudson Bay — which was the result of a period of strong offshore winds (Arviat Airport CYEK observations<\/strong><\/a>), which tend to push thicker first year ice away from the Nunavut and Manitoba coast. With cold arctic air blowing across the polynya, a layer of thin ice quickly begins to grow where the thicker ice was displaced.<\/p>\n

During the following daytime hours, a comparison of NOAA-20 VIIRS Visible, Near-Infrared and Infrared Window images valid at 1820 UTC (below)<\/strong><\/em> displayed the lower reflectance of the polynya ice in Visible imagery (which was also evident, via reflected moonlight, in the earlier Day\/Night Band image) — along with horizontal convective rolls in the Near-Infrared image, highlighting bands of blowing snow moving east-southeastward across Hudson Bay.<\/p>\n

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NOAA-20 VIIRS Visible (0.64 \u00b5m), Near-Infrared (1.61 \u00b5m) and Infrared Window (11.45 \u00b5m) images, valid at 1820 UTC [click to enlarge]<\/p><\/div>In a toggle between NOAA-20 VIIRS Visible and ATMS MiRS Sea Ice Concentration images (below)<\/em><\/strong> the Sea Ice Concentration within the polynya was as low as 88% (darker red pixels).<\/p>\n

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NOAA-20 VIIRS Visible (0.64 \u00b5m) and ATMS MiRS Sea Ice Concentration images, valid at 1820 UTC [click to enlarge]<\/p><\/div>Suomi-NPP VIIRS Ice Surface Temperature (IST) and Sea Ice Concentration (SIC) products (below)<\/strong><\/em> displayed gradients in those parameters within the polynya, with warmer IST and lower SIC values closer to the coast. The IST gradient was more notable, being about 10 K warmer near the coast.<\/p>\n

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Suomi-NPP VIIRS Ice Surface Temperature product at 1917 UTC (credit: Rich Dworak, CIMSS) [click to enlarge]<\/p><\/div>
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Suomi-NPP VIIRS Sea Ice Concentration product at 1917 UTC (credit: Rich Dworak, CIMSS) [click to enlarge]<\/p><\/div>A sequence of GOES-16 True Color RGB images (source<\/strong><\/a>) from 1540-2030 UTC on 21 January and 22 January (below)<\/strong><\/em> showed a widening of the Kivalliq Polynya during that 2-day period.<\/p>\n

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GOES-16 True Color RGB images, from 1540-2030 UTC on 21 January and 22 January [click to play MP4 animation]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A toggle between NOAA-20 VIIRS Day\/Night Band and Infrared Window images valid at 0827 UTC (2:27 AM local time) on 22 January 2024 (above) showed an opening of the Kivalliq Polynya along the northwest coast of Hudson Bay — which was the result of a period of strong offshore winds (Arviat Airport CYEK observations), which […]<\/p>\n","protected":false},"author":18,"featured_media":56621,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[89,108,74,79,93,78,49,48],"tags":[],"class_list":["post-56616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-atms","category-cryosphere","category-goes-16","category-microwave","category-mirs","category-noaa-20","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/56616","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\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=56616"}],"version-history":[{"count":14,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/56616\/revisions"}],"predecessor-version":[{"id":56647,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/56616\/revisions\/56647"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/56621"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=56616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=56616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=56616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}