Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system
Abstract The Korean Integrated Model (KIM) forecast system, based on a hybrid four‐dimensional ensemble‐variational method, was extended to assimilate Horizontal Line‐Of‐Sight (HLOS) wind observations from the Atmospheric Laser Doppler Instrument (ALADIN) on board the Atmospheric Dynamic Mission Aeo...
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ftdoajarticles:oai:doaj.org/article:0c4531c3543f4813b15f7944ce9b13ca 2023-05-15T13:39:24+02:00 Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system Sihye Lee Hyo‐Jong Song In‐Hyuk Kwon Jeon‐Ho Kang 2023-03-01T00:00:00Z https://doi.org/10.1002/asl.1138 https://doaj.org/article/0c4531c3543f4813b15f7944ce9b13ca EN eng Wiley https://doi.org/10.1002/asl.1138 https://doaj.org/toc/1530-261X 1530-261X doi:10.1002/asl.1138 https://doaj.org/article/0c4531c3543f4813b15f7944ce9b13ca Atmospheric Science Letters, Vol 24, Iss 3, Pp n/a-n/a (2023) Aeolus data assimilation HLOS wind KIM Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.1002/asl.1138 2023-03-05T01:31:25Z Abstract The Korean Integrated Model (KIM) forecast system, based on a hybrid four‐dimensional ensemble‐variational method, was extended to assimilate Horizontal Line‐Of‐Sight (HLOS) wind observations from the Atmospheric Laser Doppler Instrument (ALADIN) on board the Atmospheric Dynamic Mission Aeolus satellite. In a global cycling experiment, assimilation of Aeolus HLOS wind observations led to reductions in the average root‐mean‐square error of 0.8 and 0.5% for the zonal and meridional wind analyses when compared against European Center for Medium‐Range Weather Forecasts (ECMWF) Integrated Forecast System (IFS) analyses. Even though the observed variable is wind, there was also an overall beneficial impact on analyses of the mass variables. In the Southern Hemisphere (SH), the reduced analysis errors led to forecast skill improvements out to 72 h. In contrast, in the Northern Hemisphere (NH) there was relatively little reduction of analysis errors, but wind forecasts were nevertheless improved, and these positive impacts lasted longer – out to 120 h rather than 72 h. Experiments suggest that the relatively poor long‐range performance in the SH high latitudes was due to problems with the mass increments derived from Aeolus wind increments via the ensemble‐based part of the hybrid background error covariance (B), which eventually led to adverse effects on the wind variables as forecasts progressed in the SH. This study shows that it is necessary to estimate the ensemble B in the Antarctic region with its high elevation more accurately in order to effectively use the Aeolus observation information. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Aeolus ENVELOPE(161.267,161.267,-77.483,-77.483) Atmospheric Science Letters 24 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Aeolus data assimilation HLOS wind KIM Meteorology. Climatology QC851-999 |
spellingShingle |
Aeolus data assimilation HLOS wind KIM Meteorology. Climatology QC851-999 Sihye Lee Hyo‐Jong Song In‐Hyuk Kwon Jeon‐Ho Kang Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system |
topic_facet |
Aeolus data assimilation HLOS wind KIM Meteorology. Climatology QC851-999 |
description |
Abstract The Korean Integrated Model (KIM) forecast system, based on a hybrid four‐dimensional ensemble‐variational method, was extended to assimilate Horizontal Line‐Of‐Sight (HLOS) wind observations from the Atmospheric Laser Doppler Instrument (ALADIN) on board the Atmospheric Dynamic Mission Aeolus satellite. In a global cycling experiment, assimilation of Aeolus HLOS wind observations led to reductions in the average root‐mean‐square error of 0.8 and 0.5% for the zonal and meridional wind analyses when compared against European Center for Medium‐Range Weather Forecasts (ECMWF) Integrated Forecast System (IFS) analyses. Even though the observed variable is wind, there was also an overall beneficial impact on analyses of the mass variables. In the Southern Hemisphere (SH), the reduced analysis errors led to forecast skill improvements out to 72 h. In contrast, in the Northern Hemisphere (NH) there was relatively little reduction of analysis errors, but wind forecasts were nevertheless improved, and these positive impacts lasted longer – out to 120 h rather than 72 h. Experiments suggest that the relatively poor long‐range performance in the SH high latitudes was due to problems with the mass increments derived from Aeolus wind increments via the ensemble‐based part of the hybrid background error covariance (B), which eventually led to adverse effects on the wind variables as forecasts progressed in the SH. This study shows that it is necessary to estimate the ensemble B in the Antarctic region with its high elevation more accurately in order to effectively use the Aeolus observation information. |
format |
Article in Journal/Newspaper |
author |
Sihye Lee Hyo‐Jong Song In‐Hyuk Kwon Jeon‐Ho Kang |
author_facet |
Sihye Lee Hyo‐Jong Song In‐Hyuk Kwon Jeon‐Ho Kang |
author_sort |
Sihye Lee |
title |
Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system |
title_short |
Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system |
title_full |
Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system |
title_fullStr |
Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system |
title_full_unstemmed |
Impacts of Aeolus horizontal Line‐Of‐Sight (HLOS) wind assimilation on the Korean integrated model (KIM) forecast system |
title_sort |
impacts of aeolus horizontal line‐of‐sight (hlos) wind assimilation on the korean integrated model (kim) forecast system |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1002/asl.1138 https://doaj.org/article/0c4531c3543f4813b15f7944ce9b13ca |
long_lat |
ENVELOPE(161.267,161.267,-77.483,-77.483) |
geographic |
Antarctic The Antarctic Aeolus |
geographic_facet |
Antarctic The Antarctic Aeolus |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Atmospheric Science Letters, Vol 24, Iss 3, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1002/asl.1138 https://doaj.org/toc/1530-261X 1530-261X doi:10.1002/asl.1138 https://doaj.org/article/0c4531c3543f4813b15f7944ce9b13ca |
op_doi |
https://doi.org/10.1002/asl.1138 |
container_title |
Atmospheric Science Letters |
container_volume |
24 |
container_issue |
3 |
_version_ |
1766117985969242112 |