{"id":13992,"date":"2013-09-22T23:59:11","date_gmt":"2013-09-22T23:59:11","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=13992"},"modified":"2013-10-01T19:37:22","modified_gmt":"2013-10-01T19:37:22","slug":"resuspended-ash-from-the-katmai-volcano-in-alaska","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/13992","title":{"rendered":"Re-suspended ash from the Katmai volcano in Alaska"},"content":{"rendered":"
\"GOES-15<\/a>

GOES-15 0.63 \u00c2\u00b5m visible channel images (click image to play animation)<\/p><\/div>\n

GOES-15 0.63 \u00c2\u00b5m visible channel images (above; click image to play animation)<\/strong><\/em> showed a distinct hazy plume streaming southeastward from the Katmai volcano area in Alaska on 22 September 2013. This was a signature of re-suspended volcanic ash — a deep layer of ash has remained on the ground near the volcano following the massive 1912 eruption<\/strong><\/a> — which was carried aloft by strong winds on the back side of a deep area of low pressure over the Gulf of Alaska (below)<\/strong><\/em>.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.7 \u00c2\u00b5m Day\/Night Band image<\/p><\/div>\n

A closer view using a sequence of four Suomi NPP VIIRS 0.7 \u00c2\u00b5m Day\/Night Band images (below)<\/strong><\/em> showed the evolution of the ash plume as it moved over southeastward over Kodiak Island and then out over the Gulf of Alaska. Winds at Kodiak (station identifier PADQ)<\/em> gusted as high as 55 knots or 63 mph. With limited snow cover and strong winds (which were enhanced by local terrain effects),<\/em> the surface volcanic ash was easily lofted to great heights.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.7 \u00c2\u00b5m Day\/Night Band images<\/p><\/div>\n

An image of a MODIS-based NOAA\/STAR\/CIMSS Volcanic Ash Height product is shown in combination with the Volcanic Ash Advisory that was issued by the Anchorage Volcanic Ash Advisory Center (below)<\/strong><\/em>.<\/p>\n

\"MODIS<\/a>

MODIS Ash Height product with Volcanic Ash Advisory<\/p><\/div>\n

\"MODIS<\/a>

MODIS Ash Height product<\/p><\/div>\n

A sequence of three MODIS Volcanic Ash Height product images (above)<\/strong><\/em> suggested that the average height of the re-suspended ash plume was around 9,000 – 11,000 feet. A vertical profile of CALIPSO<\/strong><\/a> satellite-based lidar data near the source of the ash plume (below; courtesy of Mike Pavolonis, NOAA\/NESDIS\/STAR)<\/strong><\/em> indicated that the top of the plume was around 3.5 km or 11,000 feet (at 12:57 UTC, near latitude\/longitude 58 N \/ 155 W).<\/p>\n

\"CALIPSO<\/a>

CALIPSO total attenuated backscatter<\/p><\/div>\n

The corresponding MODIS Ash Mass Loading product (below)<\/strong><\/em> indicated values of 2-3 tons per square kilometer existed over much of the ash plume.<\/p>\n

\"MODIS<\/a>

MODIS Ash Mass Loading product<\/p><\/div>\n

Finally, the corresponding MODIS Ash Mass Effective Radius product (below)<\/strong><\/em> showed that much of the plume likely consisted of particles with radii in the 4-6 \u00c2\u00b5m range, with a maximum value of 8.33 \u00c2\u00b5m.<\/p>\n

\"MODIS<\/a>

MODIS Ash Mass Effective Radius product<\/p><\/div>\n

Additional information on the NOAA\/UW-CIMSS GOES-R Volcanic Ash Products shown above can be found in this Java-based VISITview lesson<\/strong><\/a> (a separate Lesson Playback Control window will open to assist in viewing the lesson content)<\/em>.<\/p>\n

===== 23 September Update =====<\/strong><\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.7 \u00c2\u00b5m Day\/Night Band image<\/p><\/div>\n

On the following day (23 September),<\/em> a Suomi NPP VIIRS 0.7 \u00c2\u00b5m Day\/Night Band image (above)<\/strong><\/em> showed that the resuspended Katmai ash plume was still present, but was much less expansive than what was seen on 22 September.<\/p>\n

Hat tip to Mark Ruminski of the NOAA\/NESDIS Satellite Services Division for bringing this interesting event to our attention!<\/p>\n","protected":false},"excerpt":{"rendered":"

GOES-15 0.63 \u00c2\u00b5m visible channel images (above; click image to play animation) showed a distinct hazy plume streaming southeastward from the Katmai volcano area in Alaska on 22 September 2013. This was a signature of re-suspended volcanic ash — a deep layer of ash has remained on the ground near the volcano following the massive […]<\/p>\n","protected":false},"author":18,"featured_media":14051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37,21,43,34,12,47,49,48,9],"tags":[],"class_list":["post-13992","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arctic","category-aviation","category-goes-15","category-goes-r","category-modis","category-other-satellites","category-suomi_npp","category-viirs","category-volcanic-activity"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13992","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=13992"}],"version-history":[{"count":18,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13992\/revisions"}],"predecessor-version":[{"id":14031,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13992\/revisions\/14031"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/14051"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=13992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=13992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=13992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}