{"id":12860,"date":"2019-05-29T10:51:45","date_gmt":"2019-05-29T10:51:45","guid":{"rendered":"https:\/\/www.nwpsaf.eu\/site\/?page_id=12860"},"modified":"2026-04-28T08:04:16","modified_gmt":"2026-04-28T08:04:16","slug":"amv-usage-in-the-jma-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-jma-nwp-model\/","title":{"rendered":"AMV usage in the JMA NWP model"},"content":{"rendered":"

Use of AMVs in the JMA model<\/h2>\n

Physical characteristics<\/span><\/h3>\n

Global Model<\/span><\/h4>\n
    \n
  • Spectral model\n
  • Horizontal resolution:\n
      \n
    • Model: TQ959 (∼0.1250° (13 km), Reduced Gaussian Grid).\n
    • Analysis: Outer loop is TQ959, inner loop is TL319 (∼0.5625° (55 km), Reduced Gaussian Grid).\n<\/ul>\n
    • Vertical resolution: Surface + 128 levels up to 0.01 hPa.\n
    • Analysis times (T): 00, 06, 12, 18 Z\n<\/ul>\n

      Data assimilation method<\/span><\/h3>\n

      Global Model<\/span><\/h4>\n
        \n
      • Hybrid LETKF\/4D-Var, 6 hr time window\n
      • Time window: T ± 3 hr\n
      • Time constraints (model runtime):\n
          \n
        • Early analysis: 40 min before time window ends\n
        • Cycle analysis: 8 hr 50 min after time window ends (T=00,12Z) and 4 hr 50 min after time window ends (T=06,18Z)\n<\/ul>\n<\/ul>\n

          AMV types assimilated<\/span><\/h3>\n

          Global Model<\/span><\/h4>\n
            \n
          • Meteosat-9,10 BUFR IR10.8, VIS0.8, cloudy WV(6.2, 7.3)<\/li>\n
          • Himawari-9 BUFR IR(3.9, 10.4), VIS(0.64), cloudy WV(6.2, 6.9, 7.3)<\/li>\n
          • GOES-16,18 BUFR IR(3.9, 11.2), VIS0.64, cloudy\/clear sky WV(6.2, 6.9, 7.3)<\/li>\n
          • CIMSS MODIS Terra A\/N IR, cloudy WV<\/li>\n
          • CIMSS MODIS Aqua A\/N IR, cloudy WV<\/li>\n
          • NESDIS and direct broadcast CIMSS MODIS Aqua IR, cloudy WV, clear sky WV <\/li>\n
          • CIMSS and NESDIS AVHRR NOAA-15<\/li>\n
          • CIMSS AVHRR NOAA-18,-19, Metop-B<\/li>\n
          • NESDIS VIIRS Suomi-NPP,NOAA-20\n
          • CIMSS LEOGEO<\/li>\n
          • EUMETSAT AVHRR Dual-Metop\n<\/ul>\n

            Global quality control<\/span><\/h3>\n

            Blacklisting in space<\/span><\/h4>\n
              \n
            • MODIS IR winds for NH above 300 hPa or below 900 hPa\n<\/li>\n
            • MODIS WV and CSWV winds for NH above 300 hPa or below 550 hPa\n<\/li>\n
            • MODIS IR and WV winds for SH above 300 hPa or below 550 hPa\n<\/li>\n
            • MODIS CSWV winds for SH above 350 hPa or below 550 hPa\n<\/li>\n
            • MODIS IR and WV winds for SH above 300 hPa or below 550 hPa\n<\/li>\n
            • MODIS CSWV winds for SH above 350 hPa or below 550 hPa\n<\/li>\n
            • ALL AVHRR and VIIRS winds below 700 hPa <\/li>\n
            • NESDIS AVHRR winds above 400 hPa\n<\/li>\n
            • VIIRS winds above 300 hPa\n
            • VIIRS winds over land below 400 hPa\n
            • LEOGEO winds above 300 hPa or below 900 hPa\n<\/li>\n
            • LEOGEO winds between 600 hPa and 640 hPa\n<\/li>\n
            • LEOGEO winds at the extratropics poleward of 70N or 70S\n<\/li>\n
            • LEOGEO winds at the extratropics poleward of 60S between 640 hPa and 900 hPa\n<\/li>\n
            • Dual-Metop winds between 50S and 50N\n
            • Dual-Metop winds above 300 hPa\n
            • Dual-Metop winds over land below 700 hPa\n
            • All polar winds at the extratropics poleward of 88N or 88S\n<\/li>\n
            • All geostationary winds above 175 hPa or below 975 hPa except Himawari-9 winds\n<\/li>\n
            • All geostationary winds between 400 hPa and 825 hPa except Himawari-9 winds\n<\/li>\n
            • All geostationary IR winds above 275 hPa at the extratropics poleward of 20N or 20S except Himawari-9 winds <\/li>\n
            • All geostationary WV winds above 225 hPa at the extratropics poleward of 20N or 20S except Himawari-9 winds <\/li>\n
            • Himawari-9 IR and VIS winds over land below 700 hPa<\/li>\n
            • Meteosat-9 IR and VIS winds over land below 700 hPa<\/li>\n<\/ul>\n

              Blacklisting by wind speed<\/p>\n

                \n
              • Japan and surrounding area (Area of super-observation processing) wind speed 15 m\/s and over 15 m\/s and large u-component wind speed compared with v-component wind speed and O-B over 3 m\/s or under -2 m\/s <\/li>\n
              • Reject for O-B vector difference > 14.1 m\/s for GOES winds\n<\/ul>\n

                QI thresholds<\/span><\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                 <\/td>\nextratropics<\/td>\ntropics<\/td>\n<\/tr>\n
                HL (NH\/SH)<\/td>\nML (NH\/SH)<\/td>\nLL (NH\/SH)<\/td>\nHL<\/td>\nML<\/td>\nLL<\/td>\n<\/tr>\n
                Meteosat-9,10<\/td>\nQI1<\/td>\nIR<\/td>\n94\/90<\/td>\n90\/90<\/td>\n80\/80<\/td>\n82<\/td>\n88<\/td>\n85<\/td>\n<\/tr>\n
                VIS<\/td>\n-\/-<\/td>\n-\/-<\/td>\n82\/82<\/td>\n–<\/td>\n–<\/td>\n82<\/td>\n<\/tr>\n
                WV<\/td>\n94\/94<\/td>\n-\/-<\/td>\n-\/-<\/td>\n84<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
                GOES-16,18<\/td>\nQI2<\/td>\nIR<\/td>\n90<\/td>\n90<\/td>\n90<\/td>\n87<\/td>\n87<\/td>\n87<\/td>\n<\/tr>\n
                VIS<\/td>\n–<\/td>\n–<\/td>\n90<\/td>\n–<\/td>\n–<\/td>\n87<\/td>\n<\/tr>\n
                WV<\/td>\n90<\/td>\n–<\/td>\n–<\/td>\n87<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
                Himawari-9<\/td>\nQI1<\/td>\nIR<\/td>\n85\/92<\/td>\n94\/91<\/td>\n88\/93<\/td>\n85<\/td>\n85<\/td>\n88<\/td>\n<\/tr>\n
                VIS<\/td>\n88\/96<\/td>\n95\/96<\/td>\n85\/85<\/td>\n95<\/td>\n90<\/td>\n85<\/td>\n<\/tr>\n
                WV<\/td>\n85\/95<\/td>\n85\/85<\/td>\n-\/-<\/td>\n85<\/td>\n85<\/td>\n–<\/td>\n<\/tr>\n
                Polar orbit satellites
                \n(except LEOGEO and Dual-Metop)<\/td>\n                		QI1<\/td>\nIR<\/td>\n60<\/td>\n60<\/td>\n60<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
                VIS<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
                WV<\/td>\n60<\/td>\n60<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
                LEOGEO<\/td>\nQI1<\/td>\nIR<\/td>\n70<\/td>\n70<\/td>\n70<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
                Dual-Metop<\/td>\nQI1<\/td>\nIR<\/td>\n85<\/td>\n85<\/td>\n85<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                tropics: 20S-20N, extratropics: polewards of 20S\/N
                \nHL: 10-400 hPa, ML: 400-700 hPa, LL: 700-1000 hPa
                \nNH: Northern Hemisphere, SH: Southern Hemisphere<\/p>\n

                QI1 – EUMETSAT QI with first guess check
                \nQI2 – EUMETSAT QI without first guess check
                \nRFF – Recursive Filter Function (CIMSS\/NESDIS)<\/p>\n

                For information on how the quality indicators are formulated
                \nsee Holmlund (1998, Weather Forecasting<\/i> 13<\/b> 1093-1104) and Hayden and Purser (1995, Journal of Applied Meteorology<\/i> 34<\/b> 3-15).<\/p>\n

                Thinning<\/span><\/h4>\n
                  \n
                • All geostationary winds thinned in 2° by 2° by 100 hPa boxes. A minimum horizontal distance is 200 km. <\/li>\n
                • Wind selected by highest QI and proximity to analysis time and centre of thinning boxes for all geostationary winds.<\/li>\n
                • All polar winds thinned in 1.5° by 1.5° by 100 hPa boxes.<\/li>\n
                • Wind selected by proximity to analysis time and centre of thinning boxes for all polar winds.<\/li>\n
                • Only one wind selected per box in the 6 hour time window for all winds. <\/li>\n<\/ul>\n<\/td>\n<\/tr>\n

                Super-observation processing<\/b><\/p>\n
                  \n
                • The super-observation data are produced by averaging hourly Himawari-8 winds in 1° by 1° by 100 hPa boxes.<\/li>\n
                • The data are only produced over Japan and the surrounding areas (20N-45N, 120E-150E).<\/li>\n<\/ul>\n

                  Background check<\/span><\/h4>\n
                    \n
                  • Pass for |O-B| ≤ a + 1.5 * σ <\/li>\n
                  • Reject for |O-B| > a + 3 * σ <\/li>\n
                  • Between these criteria, the data undergoes consistency check. <\/li>\n<\/ul>\n

                    where “a” is predefined criteria calculated from averaged O-B and σ is predefined observation error, dependent on wind level.
                    \nO: observation, B: first guess<\/p>\n

                    Observation errors<\/span><\/h3>\n\n\n\n\n
                    Level (hPa)<\/td>\n1000<\/td>\n850<\/td>\n700<\/td>\n500<\/td>\n400<\/td>\n300<\/td>\n200<\/td>\n100<\/td>\n50<\/td>\n30<\/td>\n10<\/td>\n<\/tr>\n
                    Error (m\/s)<\/td>\n4.5<\/td>\n4.5<\/td>\n4.5<\/td>\n4.5<\/td>\n4.3<\/td>\n5.3<\/td>\n5.8<\/td>\n6.8<\/td>\n7.0<\/td>\n7.2<\/td>\n7.6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

                    Use of AMVs in the JMA model Physical characteristics Global Model Spectral model Horizontal resolution: Model: TQ959 (∼0.1250° (13 km), Reduced Gaussian Grid). Analysis: Outer loop is TQ959, inner loop is TL319 (∼0.5625° (55 km), Reduced Gaussian Grid). Vertical resolution: Surface + 128 levels up to 0.01 hPa. Analysis times (T): 00, 06, 12, 18 Z Data assimilation method Global Model Hybrid LETKF\/4D-Var, 6 hr time window Time window: T ± 3 hr Time constraints (model runtime): Early analysis: 40 min before time window ends Cycle analysis: 8 hr 50 min after time window ends (T=00,12Z) and 4 hr 50 […]<\/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-12860","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/12860","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=12860"}],"version-history":[{"count":1,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/12860\/revisions"}],"predecessor-version":[{"id":51903,"href":"https:\/\/nwp-saf.eumetsat.int\/site\/wp-json\/wp\/v2\/pages\/12860\/revisions\/51903"}],"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=12860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}