A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions
The reliability of the global reanalyses in the polar regions is investigated. The overview stems from an April 2006 Scientific Committee on Antarctic Research (SCAR) workshop on the performance of global reanalyses in high latitudes held at the British Antarctic Survey. Overall, the skill is much h...
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ftunivreading:oai:centaur.reading.ac.uk:187 2024-06-23T07:46:41+00:00 A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions Bromwich, D. H. Fogt, R. L. Hodges, K. I. Walsh, E. 2007 text https://centaur.reading.ac.uk/187/ https://centaur.reading.ac.uk/187/1/1287grl24641.pdf http://www.agu.org/journals/jd/ en eng American Geophysical Union https://centaur.reading.ac.uk/187/1/1287grl24641.pdf Bromwich, D. H., Fogt, R. L., Hodges, K. I. <https://centaur.reading.ac.uk/view/creators/90000463.html> and Walsh, E. (2007) A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions. Journal of Geophysical Research, 112. D10111. ISSN 0148-0227 doi: https://doi.org/10.1029/2006JD007859 <https://doi.org/10.1029/2006JD007859> 551 Geology hydrology meteorology Article PeerReviewed 2007 ftunivreading https://doi.org/10.1029/2006JD007859 2024-06-11T14:41:45Z The reliability of the global reanalyses in the polar regions is investigated. The overview stems from an April 2006 Scientific Committee on Antarctic Research (SCAR) workshop on the performance of global reanalyses in high latitudes held at the British Antarctic Survey. Overall, the skill is much higher in the Arctic than the Antarctic, where the reanalyses are only reliable in the summer months prior to the modern satellite era. In the Antarctic, large circulation differences between the reanalyses are found primarily before 1979, when vast quantities of satellite sounding data started to be assimilated. Specifically for ERA-40, this data discontinuity creates a marked jump in Antarctic snow accumulation, especially at high elevations. In the Arctic, the largest differences are related to the reanalyses depiction of clouds and their associated radiation impacts; ERA-40 captures the cloud variability much better than NCEP1 and JRA-25, but the ERA-40 and JRA-25 clouds are too optically thin for shortwave radiation. To further contrast the reanalyses skill, cyclone tracking results are presented. In the Southern Hemisphere, cyclonic activity is markedly different between the reanalyses, where there are few matched cyclones prior to 1979. In comparison, only some of the weaker cyclones are not matched in the Northern Hemisphere from 1958-2001, again indicating the superior skill in this hemisphere. Although this manuscript focuses on deficiencies in the reanalyses, it is important to note that they are a powerful tool for climate studies in both polar regions when used with a recognition of their limitations. Article in Journal/Newspaper Antarc* Antarctic Arctic British Antarctic Survey SCAR Scientific Committee on Antarctic Research CentAUR: Central Archive at the University of Reading Antarctic Arctic The Antarctic Journal of Geophysical Research: Atmospheres 112 D10 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
topic |
551 Geology hydrology meteorology |
spellingShingle |
551 Geology hydrology meteorology Bromwich, D. H. Fogt, R. L. Hodges, K. I. Walsh, E. A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions |
topic_facet |
551 Geology hydrology meteorology |
description |
The reliability of the global reanalyses in the polar regions is investigated. The overview stems from an April 2006 Scientific Committee on Antarctic Research (SCAR) workshop on the performance of global reanalyses in high latitudes held at the British Antarctic Survey. Overall, the skill is much higher in the Arctic than the Antarctic, where the reanalyses are only reliable in the summer months prior to the modern satellite era. In the Antarctic, large circulation differences between the reanalyses are found primarily before 1979, when vast quantities of satellite sounding data started to be assimilated. Specifically for ERA-40, this data discontinuity creates a marked jump in Antarctic snow accumulation, especially at high elevations. In the Arctic, the largest differences are related to the reanalyses depiction of clouds and their associated radiation impacts; ERA-40 captures the cloud variability much better than NCEP1 and JRA-25, but the ERA-40 and JRA-25 clouds are too optically thin for shortwave radiation. To further contrast the reanalyses skill, cyclone tracking results are presented. In the Southern Hemisphere, cyclonic activity is markedly different between the reanalyses, where there are few matched cyclones prior to 1979. In comparison, only some of the weaker cyclones are not matched in the Northern Hemisphere from 1958-2001, again indicating the superior skill in this hemisphere. Although this manuscript focuses on deficiencies in the reanalyses, it is important to note that they are a powerful tool for climate studies in both polar regions when used with a recognition of their limitations. |
format |
Article in Journal/Newspaper |
author |
Bromwich, D. H. Fogt, R. L. Hodges, K. I. Walsh, E. |
author_facet |
Bromwich, D. H. Fogt, R. L. Hodges, K. I. Walsh, E. |
author_sort |
Bromwich, D. H. |
title |
A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions |
title_short |
A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions |
title_full |
A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions |
title_fullStr |
A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions |
title_full_unstemmed |
A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions |
title_sort |
tropospheric assessment of the era-40, ncep, and jra-25 global reanalyses in the polar regions |
publisher |
American Geophysical Union |
publishDate |
2007 |
url |
https://centaur.reading.ac.uk/187/ https://centaur.reading.ac.uk/187/1/1287grl24641.pdf http://www.agu.org/journals/jd/ |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic British Antarctic Survey SCAR Scientific Committee on Antarctic Research |
genre_facet |
Antarc* Antarctic Arctic British Antarctic Survey SCAR Scientific Committee on Antarctic Research |
op_relation |
https://centaur.reading.ac.uk/187/1/1287grl24641.pdf Bromwich, D. H., Fogt, R. L., Hodges, K. I. <https://centaur.reading.ac.uk/view/creators/90000463.html> and Walsh, E. (2007) A Tropospheric Assessment of the ERA-40, NCEP, and JRA-25 Global Reanalyses in the Polar Regions. Journal of Geophysical Research, 112. D10111. ISSN 0148-0227 doi: https://doi.org/10.1029/2006JD007859 <https://doi.org/10.1029/2006JD007859> |
op_doi |
https://doi.org/10.1029/2006JD007859 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
112 |
container_issue |
D10 |
_version_ |
1802647543908139008 |