{"id":2338,"date":"2009-04-04T23:59:49","date_gmt":"2009-04-04T23:59:49","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=2338"},"modified":"2009-04-07T02:19:48","modified_gmt":"2009-04-07T02:19:48","slug":"04-april-2009-redoubt-volcanic-eruption","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/2338","title":{"rendered":"Yet another Redoubt volcanic eruption"},"content":{"rendered":"
\"GOES-11<\/a>

GOES-11 visible, 3.9 \u00c2\u00b5m IR, 10.7 \u00c2\u00b5m IR, and IR "split window difference" images<\/p><\/div>\n

The Mt. Redoubt volcano<\/strong><\/a> in Alaska experienced its 19th explosive event (in a series that began on 23 March) <\/em>on 04 April 2009<\/strong>. GOES-11 visible, 3.9 \u00c2\u00b5m shortwave IR (IR2), 10.7 \u00c2\u00b5m IR window (IR4), and 10.7-11.0 \u00c2\u00b5m “split window difference” images (above)<\/strong><\/em> showed that the southeastward advection of the volcanic plume became increasingly difficult to follow a few hours after the eruption.<\/p>\n

However, the volcanic plume likely contained a good deal of water vapor, which made it easier to track on GOES-11 6.7 \u00c2\u00b5m “water vapor channel” imagery (below)<\/strong><\/em> as it moved toward and eventually south of 50\u00c2\u00ba N latitude\u00c2\u00a0 after about 21:00 UTC.<\/p>\n

\"GOES-11<\/a>

GOES-11 6.7 \u00c2\u00b5m water vapor images<\/p><\/div>\n

Images of the MODIS 1.3 \u00c2\u00b5m “cirrus detection channel” at 20:45 and 22:35 UTC (below)<\/strong><\/em> exhibited a signal of the leading edge of the volcanic plume as it approached and moved south of 50\u00c2\u00ba N latitude (between 144\u00c2\u00ba W and 142\u00c2\u00ba W longitude)<\/em>. This MODIS near-IR<\/em> channel is sensitive to particles that are efficient scatterers of light (such as smoke, haze, dust, ash),<\/em> so these types of airborne particles to show up as slightly brighter<\/em> features on grayscale-enhanced MODIS “cirrus detection channel” imagery.<\/p>\n

\"Terra<\/a>

Terra and Aqua MODIS near-IR "Cirrus detection channel" images<\/p><\/div>\n

The extent of the long-range transport of the Redoubt SO2 plume was even more obvious on the AIRS Ozone Monitoring Instrument (OMI) SO2<\/strong><\/a> 24-hour composite image for 04 April (below)<\/strong><\/em>.<\/p>\n

\"OMI<\/a>

AIRS OMI SO2 24-hour composite image<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

The Mt. Redoubt volcano in Alaska experienced its 19th explosive event (in a series that began on 23 March) on 04 April 2009. GOES-11 visible, 3.9 \u00c2\u00b5m shortwave IR (IR2), 10.7 \u00c2\u00b5m IR window (IR4), and 10.7-11.0 \u00c2\u00b5m “split window difference” images (above) showed that the southeastward advection of the volcanic plume became increasingly difficult […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37,15,18,12,26,9],"tags":[],"class_list":["post-2338","post","type-post","status-publish","format-standard","hentry","category-arctic","category-goes-sounder","category-goes-11","category-modis","category-poes","category-volcanic-activity"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2338","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=2338"}],"version-history":[{"count":10,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2338\/revisions"}],"predecessor-version":[{"id":2342,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2338\/revisions\/2342"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=2338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=2338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=2338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}