{"id":4765,"date":"2010-03-16T23:59:24","date_gmt":"2010-03-16T23:59:24","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=4765"},"modified":"2010-03-18T04:21:16","modified_gmt":"2010-03-18T04:21:16","slug":"contrails-over-the-southwest-us","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/4765","title":{"rendered":"Contrails over the Southwest US"},"content":{"rendered":"
\"MODIS<\/a>

MODIS 0.65 \u00c2\u00b5m visible channel images<\/p><\/div>\n

AWIPS images of the 1-km resolution MODIS 0.65 \u00c2\u00b5m visible channel data (above)<\/em><\/strong> showed a hint of a few aircraft contrails over the Southwestern US at 18:03 and 21:22 UTC on 16 March 2010<\/a><\/strong>. However, note that many more contrails were apparent on the corresponding MODIS 1.4 \u00c2\u00b5m near-IR “cirrus detection channel” images (below)<\/strong>. The ABI instrument<\/a><\/strong> on the upcoming GOES-R satellite<\/a><\/strong> will contain near-IR channels similar to this MODIS near-IR channel that will enable more accurate cirrus cloud and contrail detection.<\/p>\n

\"MODIS<\/a>

MODIS 1.4 \u00c2\u00b5m near-IR "cirrus detection channel" images<\/p><\/div>\n

While none of these contrails appeared to be very cold on 1-km resolution MODIS 11.0 \u00c2\u00b5m IR imagery<\/a><\/strong> (none were even near the -20\u00c2\u00ba C IR brightness temperature threshold),<\/em> the 1-km resolution AVHRR Cloud Top Temperature (CTT) product at 20:36 UTC (below)<\/em><\/strong> indicated that portions of a few of the contrails were exhibiting CTT values as cold as -30 to -40\u00c2\u00ba C (darker blue color enhancement)<\/em> — however, no single contrail appeared to be cold enough to have completely glaciated along it’s entire length.<\/p>\n

\"AVHRR<\/a>

AVHRR Cloud Top Temperature product<\/p><\/div>\n

The 1-km resolution AVHRR Cloud Type Product (below)<\/em><\/strong> also indicated that the majority of these contrails were composed of supercooled water droplets (cyan color enhancement),<\/em> although some portions of a few of the contrails were glaciating and being flagged as cirrus (orange color enhancement)<\/em>.<\/p>\n

\"AVHRR<\/a>

AVHRR Cloud Type Product<\/p><\/div>\n

The 1-km resolution AVHRR Cloud Top Height (CTH) product (below)<\/em><\/strong> showed that segments of the highest contrails had CTH values around 9 km (blue color enhancement)<\/em>.<\/p>\n

\"AVHRR<\/a>

AVHRR Cloud Top Height product<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

AWIPS images of the 1-km resolution MODIS 0.65 \u00c2\u00b5m visible channel data (above) showed a hint of a few aircraft contrails over the Southwestern US at 18:03 and 21:22 UTC on 16 March 2010. However, note that many more contrails were apparent on the corresponding MODIS 1.4 \u00c2\u00b5m near-IR “cirrus detection channel” images (below). The […]<\/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":[22,21,34,12],"tags":[],"class_list":["post-4765","post","type-post","status-publish","format-standard","hentry","category-avhrr","category-aviation","category-goes-r","category-modis"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/4765","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=4765"}],"version-history":[{"count":11,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/4765\/revisions"}],"predecessor-version":[{"id":4767,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/4765\/revisions\/4767"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=4765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=4765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=4765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}