{"id":17179,"date":"2014-11-15T23:59:56","date_gmt":"2014-11-15T23:59:56","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=17179"},"modified":"2014-11-17T16:26:54","modified_gmt":"2014-11-17T16:26:54","slug":"eruption-of-the-pavlof-volcano-in-alaska","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/17179","title":{"rendered":"Eruption of the Pavlof Volcano in Alaska"},"content":{"rendered":"
\"Suomi<\/a>

Suomi NPP VIIRS 0.7 \u00b5m Day\/Night Band and 3.74 \u00b5m shortwave IR images<\/p><\/div>\n

According to the Alaska Volcano Observatory<\/strong><\/a>, an eruption of the Pavlof Volcano<\/strong><\/a> began around 01:50 UTC on 13 November 2014. A comparison of nighttime images of Suomi NPP VIIRS 0.7 \u00b5m Day\/Night Band (DNB) and 3.74 \u00b5m shortwave IR data at 13:07 UTC or 4:07 am local time on 14 November (above)<\/em><\/strong> showed the bright glow of the eruption on the DNB image, with the hottest pixel being 52\u00ba C (red color enhancement)<\/em> on the shortwave IR image.<\/p>\n

With the subsequent arrival of daylight, a break in the clouds allowed the faint volcanic plume to be observed on GOES-15 0.63 \u00b5m visible channel images (below; click image to play animation),<\/strong><\/em> drifting northwestward over the Bering Sea.<\/p>\n

\"GOES-15<\/a>

GOES-15 0.63 \u00b5m visible channel images (click to play animation)<\/p><\/div>\n

At 22:02 UTC on 14 November, the radiometrically-retrieved maximum volcanic ash mass loading value was 1.8 tons per km2, the maximum ash height was 16.8 km, and the maximum ash mass effective radius was 7.81 \u00b5m (below)<\/strong><\/em>.<\/p>\n

\"MODIS<\/a>

MODIS volcanic ash mass loading, ash height, and ash mass effective radius products<\/p><\/div>\n

About an hour later, the volcanic ash plume could be seen on a 23:03 UTC Suomi NPP VIIRS Day\/Night Band image, with a maximum 3.74 \u00b5m shortwave IR brightness temperature of 46\u00ba C at the summit of the volcano (below)<\/strong><\/em>.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.7 \u00b5m Day\/Night Band and 3.74 \u00b5m shortwave IR images<\/p><\/div>\n

The brown hue of the volcanic ash plume was very evident on Suomi NPP VIIRS true-color Red\/Green\/Blue (RGB) images from the SSEC RealEarth<\/strong><\/a> web map server (below)<\/strong><\/em>.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS true-color RGB images<\/p><\/div>\n

The intensity of the Pavlof eruption increased on 15 November, and a well-defined volcanic ash plume could be seen on GOES-15 0.63 \u00b5m visible channel images (below; click image to play animation).<\/strong><\/em> Pilot reports estimated that the top of the plume was as high as 38,000 feet.
\n<\/strong><\/em><\/p>\n

\"GOES-15<\/a>

GOES-15 0.63 \u00b5m visible channel images (click to play animation)<\/p><\/div>\n

On a comparison of Suomi NPP VIIRS 0.64 \u00b5m visible channel and 11.45 \u00b5m IR channel images at 22:45 UTC (below),<\/strong><\/em> the coldest cloud-top IR brightness temperature value was -55\u00ba C.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.64 \u00b5m visible channel and 11.45 \u00b5m IR channel images<\/p><\/div>\n

At 22:29 UTC, the CLAVR-x<\/strong><\/a> POES AVHRR Cloud Top Temperature product indicated a minimum value of -54\u00ba C, with a maximum Cloud Top Height value of 9 km; the -54\u00ba C cloud top temperature corresponded to an altitude of around 29,000 feet or 8.7 km on the 16 November\/00 UTC Cold Bay AK rawinsonde profile<\/strong><\/a>.<\/p>\n

\"POES<\/a>

POES AVHRR Cloud Top Temperature and Cloud Top Height products<\/p><\/div>\n

A Suomi NPP VIIRS true-color RGB image at 23:04 UTC (below)<\/strong> <\/em>suggested that the volcanic plume consisted of a dense layer of tan-colored ash, with a layer of mostly ice cloud at the top of the plume.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS true-color RGB image<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

According to the Alaska Volcano Observatory, an eruption of the Pavlof Volcano began around 01:50 UTC on 13 November 2014. A comparison of nighttime images of Suomi NPP VIIRS 0.7 \u00b5m Day\/Night Band (DNB) and 3.74 \u00b5m shortwave IR data at 13:07 UTC or 4:07 am local time on 14 November (above) showed the bright […]<\/p>\n","protected":false},"author":18,"featured_media":17182,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[22,43,12,26,53,45,49,48,9],"tags":[],"class_list":["post-17179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-avhrr","category-goes-15","category-modis","category-poes","category-real-earth","category-redgreenblue-rgb-images","category-suomi_npp","category-viirs","category-volcanic-activity"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/17179","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=17179"}],"version-history":[{"count":13,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/17179\/revisions"}],"predecessor-version":[{"id":17194,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/17179\/revisions\/17194"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/17182"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=17179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=17179"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=17179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}