{"id":65621,"date":"2025-06-30T16:13:21","date_gmt":"2025-06-30T16:13:21","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=65621"},"modified":"2025-07-04T16:54:38","modified_gmt":"2025-07-04T16:54:38","slug":"smog-with-light-winds-over-kyushu","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/65621","title":{"rendered":"Smog with light winds over Kyushu"},"content":{"rendered":"\n
\"\"<\/a>
True Color imagery from NOAA-21 (ca. 0422 UTC), Suomi-NPP (ca. 0448 UTC) and NOAA-20 (ca. 0510 UTC) , 30 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

True Color imagery over western Japan, above, from three JPSS Satellites (from the NASA Worldview site<\/a>) show a region with a hazy signature that appears to originate over Kyushu’s main cities of Kumamoto and Fukuoka. Winds at this time are relatively light, as evidenced by the NOAA-21 image, shown below, that includes a dark region within the sun glint (see this blog post<\/a> for another discussion of diagnosing light winds within areas of sun glint).<\/p>\n\n\n\n

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NOAA-21 True Color imagery ca. 0422 UTC on 30 June 2025 (Click to enlarge). A region of likely light winds is circled.<\/figcaption><\/figure>\n\n\n\n

Advanced Scattermeter (ASCAT) data from a fortuitous overpass from Metop-B (source<\/a>), shown below, confirms the region of very light winds around Kyushu.<\/p>\n\n\n\n

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ASCAT winds from MetopB, 1229 UTC on 30 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Aerosol Optical Depth (scaled from 0-5) computed from Suomi NPP and NOAA-20 is shown below. The haze does not appear to be from active fires based on this animation of shortwave infrared imagery from Himawari-9<\/a>.<\/p>\n\n\n\n

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Aerosol Optical Depth imagery (blended from Suomi-NPP and NOAA-20), 30 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Air Quality Indices, below, (from this site<\/a>), show the worst near-surface Air Quality over southern Kyushu. This is a good reminder that satellite detection of AOD views the entire atmosphere — to get the best description of Air Quality, use both surface and satellite detection.<\/p>\n\n\n\n

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Near-surface Air Quality over southwestern Japan, 30 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

Editor’s Note: This is my last contribution to the CIMSS Satellite Blog, as I am retiring today after 30 years (plus 1 month, a week and a day) with the University of Wisconsin-Madison. It has been a great honor to talk about beautiful and informative satellite imagery in this space, starting in 2006 with this blog post on Parallax<\/a>. I hope my writings (1) have been helpful and (2) have been accurate. It’s honestly the best job I could imagine having!<\/p>\n","protected":false},"excerpt":{"rendered":"

True Color imagery over western Japan, above, from three JPSS Satellites (from the NASA Worldview site) show a region with a hazy signature that appears to originate over Kyushu’s main cities of Kumamoto and Fukuoka. Winds at this time are relatively light, as evidenced by the NOAA-21 image, shown below, that includes a dark region […]<\/p>\n","protected":false},"author":19,"featured_media":65622,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7,73,78,131,49],"tags":[],"class_list":["post-65621","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-quality","category-himawari-9","category-noaa-20","category-noaa-21","category-suomi_npp"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/65621","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=65621"}],"version-history":[{"count":6,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/65621\/revisions"}],"predecessor-version":[{"id":65738,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/65621\/revisions\/65738"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/65622"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=65621"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=65621"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=65621"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}