{"id":7220,"date":"2010-11-19T23:59:40","date_gmt":"2010-11-19T23:59:40","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=7220"},"modified":"2011-01-25T18:04:54","modified_gmt":"2011-01-25T18:04:54","slug":"detecting-ship-tracks-in-the-gulf-of-alaska","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/7220","title":{"rendered":"Detecting ship condensation trails in the Gulf of Alaska"},"content":{"rendered":"<div style=\"width: 490px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/101119_avhrr_anim.gif\"><img loading=\"lazy\" decoding=\"async\" title=\"POES AVHRR images and derived cloud products\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/101119_avhrr_anim.gif\" alt=\"POES AVHRR images and derived cloud products\" width=\"480\" height=\"453\" \/><\/a><p class=\"wp-caption-text\">POES AVHRR images and derived cloud products<\/p><\/div>\n<p>A comparison of AWIPS images of the 1-km resolution <strong><a title=\"POES\/AVHRR in AWIPS: VISIT training lesson\" href=\"http:\/\/rammb.cira.colostate.edu\/training\/visit\/training_sessions\/poes_and_avhrr_satellite_products_in_awips\/\">POES AVHRR<\/a><\/strong> 0.86 \u00c2\u00b5m visible channel, 12.0 \u00c2\u00b5m IR channel, Cloud Top Temperature product, Cloud Type product, Cloud Top Height product, Cloud Optical Depth product, and Cloud Particle Effective Radius product <em><strong>(above)<\/strong><\/em> demonstrated that the Cloud Particle Effective Radius product was the best tool to use in locating the pattern of ship condensation trails <em>(or &#8220;ship tracks&#8221;)<\/em> that was located over the northern Gulf of Alaska on <strong>19 November 2010<\/strong>.<\/p>\n<p>The Cloud Type of the stratus cloud deck where the ship tracks were seen was primarily  of the &#8220;supercooled&#8221; classification <em>(green color enhancement),<\/em> with Cloud Top Temperatures generally in the -3\u00c2\u00ba to -4\u00c2\u00ba C range and Cloud Top Heights of 2-3 km. According to the Cloud Particle Effective Radius product, the size of the particles within the ship track features was about 23-25 \u00c2\u00b5m &#8212; somewhat smaller than the 27-31 \u00c2\u00b5m in the surrounding undisturbed stratus cloud deck. This is evidence of the &#8220;Twomey effect&#8221;, where sulfate aerosols (found in the exhaust plumes of the diesel-burning ships) act as cloud condensation nuclei, which leads to greater numbers of <em>smaller<\/em> cloud droplets.<\/p>\n<p>As part of the CIMSS involvement in <strong><a href=\"..\/..\/..\/goes_r\/proving-ground.html\">GOES-R Proving Ground<\/a><\/strong> activities,\u00c2\u00a0POES AVHRR satellite images and products are currently being made  available in an AWIPS format for interested NWS  forecast offices to add  to their local AWIPS workstations <em>(via LDM  subscription)<\/em>. For more information, see the\u00c2\u00a0<a title=\"MODIS Imagery in D-2D website\" href=\"http:\/\/www.ssec.wisc.edu\/%7Ejordang\/awips-modis\/index.html\"><strong> <\/strong><\/a> <a title=\"AVHRR Imagery and Products in D-2D web site\" href=\"http:\/\/www.ssec.wisc.edu\/%7Ejordang\/awips-avhrr\/index.html\"><strong>AVHRR Imagery and Products in D-2D<\/strong><\/a> site. A <a title=\"VISIT training\" href=\"http:\/\/rammb.cira.colostate.edu\/training\/visit\/\"><strong>VISIT training<\/strong><\/a> lesson has  also been created for these <a title=\"AVHRR Imagery and Products in AWIPS training lesson\" href=\"http:\/\/rammb.cira.colostate.edu\/training\/visit\/training_sessions\/poes_and_avhrr_satellite_products_in_awips\/\"><strong>AVHRR<\/strong><\/a> images and products.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A comparison of AWIPS images of the 1-km resolution POES AVHRR 0.86 \u00c2\u00b5m visible channel, 12.0 \u00c2\u00b5m IR channel, Cloud Top Temperature product, Cloud Type product, Cloud Top Height product, Cloud Optical Depth product, and Cloud Particle Effective Radius product (above) demonstrated that the Cloud Particle Effective Radius product was the best tool to use [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37,22,26],"tags":[],"class_list":["post-7220","post","type-post","status-publish","format-standard","hentry","category-arctic","category-avhrr","category-poes"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7220","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=7220"}],"version-history":[{"count":16,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7220\/revisions"}],"predecessor-version":[{"id":7523,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7220\/revisions\/7523"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=7220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=7220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=7220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}