{"id":12858,"date":"2019-05-29T10:44:20","date_gmt":"2019-05-29T10:44:20","guid":{"rendered":"https:\/\/www.nwpsaf.eu\/site\/?page_id=12858"},"modified":"2026-04-28T08:03:53","modified_gmt":"2026-04-28T08:03:53","slug":"amv-usage-in-the-env-canada-nwp-model","status":"publish","type":"page","link":"https:\/\/nwp-saf.eumetsat.int\/site\/monitoring\/winds-quality-evaluation\/amv\/amv-use-in-nwp\/amv-usage-in-the-env-canada-nwp-model\/","title":{"rendered":"AMV usage in the Env. Canada NWP model"},"content":{"rendered":"<h2>Use of AMVs in the Environment Canada model<\/h2>\n\n<h3>Physical characteristics<\/h3>\n<h4>Global Model<\/h4>\n<ul>\n<li>Grid-point model 2x2047x683 Yin-Yang horizontal grid<\/li>\n<li>Horizontal resolution: ~15 km<\/li>\n<li>Vertical resolution: 84 levels, model top 0.1 hPa<\/li>\n<\/ul>\n<h3>Data assimilation method<\/h3>\n<h4>Global Model<\/h4>\n<ul>\n<li>4D-EnVar, 6-h assimilation window, 4DIAU, 0.33\u00b0 x 0.33\u00b0 increment resolution<\/li>\n<li>Time window: T \u00b1 3 hr, analysis times (T): 00, 06, 12, 18 UTC<\/li>\n<li>Time constraints (model runtime):<\/li>\n<li>Early analysis and forecast run: T+3 hr, forecast at 00 and 12 UTC only<\/li>\n<li>Update analysis run: ~T+7 hr at 00, 06, 12 and 18 UTC<br \/>\n25 time bins in the 6-h assimilation window.<\/li>\n<\/ul>\n<h3>AMV types assimilated<\/h3>\n<h4>Global Model<\/h4>\n<ul>\n<li>Meteosat-10 IR, VIS, WV<\/li>\n<li>Meteosat-9 IR, VIS, WV<\/li>\n<li>GOES-16 IR, VIS, WV 6.2<\/li>\n<li>GOES-18 IR, VIS, WV 6.2<\/li>\n<li>NESDIS MODIS Terra IR, WV<\/li>\n<li>NESDIS MODIS Aqua IR, WV<\/li>\n<li>direct broadcast MODIS from Tromso, Fairbanks and McMurdo<\/li>\n<li>AVHRR NOAA-15\/18\/19 IR<\/li>\n<li>EUMETSAT Single Metop-B\/C IR<\/li>\n<li>EUMETSAT Dual-Metop IR<\/li>\n<li>VIIRS NPP IR<\/li>\n<li>VIIRS NOAA-20 IR<\/li>\n<li>Himawari-9\/8 IR, VIS, WV 6.9<\/li>\n<\/ul>\n<h3>Global quality control<\/h3>\n<h4>Blacklisting in space<\/h4>\n<ul>\n<li>All geostationary winds beyond 68\u00b0 satellite zenith angle<\/li>\n<li>All winds above 200 hPa (160 hPa over the Tropics)<\/li>\n<li>All winds below 1000 hPa (400 hPa over land)<\/li>\n<li>All VIS winds above 700 hPa<\/li>\n<li>All geostationary WV winds below 400 hPa<\/li>\n<li>All Meteosat-11, Meteosat-8 and Himawari-8\/9 winds over land north of 25N, south of 20S and below 400 hPa<\/li>\n<li>All GOES winds over land north of 20N, south of 20S and below 400 hPa<\/li>\n<li>All polar WV winds below 550 hPa<\/li>\n<li>All polar IR winds below 700 hPa<\/li>\n<li>All polar winds over land below 400 hPa<\/li>\n<li>All Dual Metop outside the latitude bands 40-60 N\/S<\/li>\n<li>All wind speeds below 3.0 m\/s<\/li>\n<\/ul>\n<h4>QI thresholds<\/h4>\n<p>Note: There are no QI thresholds applied to the polar winds except EUMETSAT Single Metop and Dual Metop (QI1&gt;80)<\/p>\n<table border=\"1\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td colspan=\"3\" rowspan=\"2\"><\/td>\n<td colspan=\"3\" align=\"center\" width=\"30%\">extratropics<\/td>\n<td colspan=\"3\" align=\"center\" width=\"30%\">tropics<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">HL<\/td>\n<td align=\"center\">ML<\/td>\n<td align=\"center\">LL<\/td>\n<td align=\"center\">HL<\/td>\n<td align=\"center\">ML<\/td>\n<td align=\"center\">LL<\/td>\n<\/tr>\n<tr class=\"dkpurplebkgnd\">\n<td rowspan=\"3\" align=\"center\">Meteosat-8\/-11<\/td>\n<td rowspan=\"3\" align=\"center\">QI1<\/td>\n<td align=\"center\">IR<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">85<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">80<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">80<\/td>\n<td align=\"center\">90<\/td>\n<td align=\"center\">90<\/td>\n<td align=\"center\">90<\/td>\n<\/tr>\n<tr class=\"dkpurplebkgnd\">\n<td align=\"center\">VIS<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">&#8211;<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">&#8211;<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">65<\/td>\n<td align=\"center\">&#8211;<\/td>\n<td align=\"center\">&#8211;<\/td>\n<td align=\"center\">90<\/td>\n<\/tr>\n<tr class=\"dkpurplebkgnd\">\n<td align=\"center\">WV<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">80<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">&#8211;<\/td>\n<td class=\"ltpurplebkgnd\" align=\"center\">&#8211;<\/td>\n<td align=\"center\">90<\/td>\n<td align=\"center\">&#8211;<\/td>\n<td align=\"center\">&#8211;<\/td>\n<\/tr>\n<tr class=\"grnbkgnd\">\n<td rowspan=\"3\" align=\"center\">GOES-16\/17<\/td>\n<td rowspan=\"3\" align=\"center\">QI2<\/td>\n<td align=\"center\">IR<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">96<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">96<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">95<\/td>\n<td align=\"center\">96<\/td>\n<td align=\"center\">98<\/td>\n<td align=\"center\">95<\/td>\n<\/tr>\n<tr class=\"grnbkgnd\">\n<td align=\"center\">VIS<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">&#8211;<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">&#8211;<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">95<\/td>\n<td align=\"center\">&#8211;<\/td>\n<td align=\"center\">&#8211;<\/td>\n<td align=\"center\">95<\/td>\n<\/tr>\n<tr class=\"grnbkgnd\">\n<td align=\"center\">WV<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">80<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">&#8211;<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">&#8211;<\/td>\n<td align=\"center\">90<\/td>\n<td align=\"center\">&#8211;<\/td>\n<td align=\"center\">&#8211;<\/td>\n<\/tr>\n<tr class=\"grnbkgnd\">\n<td rowspan=\"1\" align=\"center\">Himawari-8<\/td>\n<td rowspan=\"1\" align=\"center\">QI1<\/td>\n<td align=\"center\">ALL<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">85<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">85<\/td>\n<td class=\"ltgrnbkgnd\" align=\"center\">85<\/td>\n<td align=\"center\">85<\/td>\n<td align=\"center\">85<\/td>\n<td align=\"center\">85<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>tropics: 20S-20N<br \/>\nextratropics: polewards of 20S\/N<\/p>\n<p>hl: 10-400 hPa<br \/>\nml: 400-700 hPa<br \/>\nll: 700-1000 hPa<\/p>\n<p>QI1 &#8211; EUMETSAT QI with first guess check<br \/>\nQI2 &#8211; EUMETSAT QI without first guess check<br \/>\nRFF &#8211; Recursive Filter Function (CIMSS\/NESDIS)<\/p>\n<p>For information on how the quality indicators are formulated see Holmlund (1998, <i>Weather Forecasting<\/i> <b>13<\/b> 1093-1104) and Hayden and Purser (1995, <i>Journal of Applied Meteorology<\/i> <b>34<\/b> 3-15).<\/p>\n<h4>Thinning<\/h4>\n<ul>\n<li>The AMV are first sorted according to their quality index (QI1\/2) from highest to lowest on 10 layers.<\/li>\n<li>For each satellite, the selection process starts from the AMV with the highest QI1\/2.<\/li>\n<li>The next AMV is selected if all previous selected data in the same layer and within 6 time bins (1h30) are beyond 200 km.<\/li>\n<li>The selection process is repeated for all subsequent AMVs.<\/li>\n<li>Therefore, a minimal distance of 200km and a minimal time difference of 1h30 between adjacent AMVs are strictly imposed at each levels<\/li>\n<\/ul>\n<h4>Background check<\/h4>\n<p>The background check is applied to the vector difference between the AMV and the corresponding background value. A variational quality control is then applied on each wind component during the minimization.<\/p>\n<h3>Observation errors<\/h3>\n<p>Similar to Met Office \u2013 observation errors calculated individually for each wind using estimates of the error in vector, error in height and variation in the background wind column<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Use of AMVs in the Environment Canada model Physical characteristics Global Model Grid-point model 2x2047x683 Yin-Yang horizontal grid Horizontal resolution: ~15 km Vertical resolution: 84 levels, model top 0.1 hPa Data assimilation method Global Model 4D-EnVar, 6-h assimilation window, 4DIAU, 0.33\u00b0 x 0.33\u00b0 increment resolution Time window: T \u00b1 3 hr, analysis times (T): 00, 06, 12, 18 UTC Time constraints (model runtime): Early analysis and forecast run: T+3 hr, forecast at 00 and 12 UTC only Update analysis run: ~T+7 hr at 00, 06, 12 and 18 UTC 25 time bins in the 6-h assimilation window. AMV types assimilated [&hellip;]<\/p>\n","protected":false},"author":25,"featured_media":0,"parent":1312,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-12858","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/12858","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/comments?post=12858"}],"version-history":[{"count":1,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/12858\/revisions"}],"predecessor-version":[{"id":51902,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/12858\/revisions\/51902"}],"up":[{"embeddable":true,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/1312"}],"wp:attachment":[{"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/media?parent=12858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}