Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability
Enabled by advances in data assimilation and the digitization of historical observations, atmospheric reanalysis products that span the entire twentieth century provide valuable gridded data over the sparsely observed high-latitude Southern Hemisphere. Here austral summer and winter surface pressure...
Published in: | Geophysical Research Letters |
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Language: | English |
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2018
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Online Access: | https://doi.org/10.1002/2017GL076226 |
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ftncar:oai:drupal-site.org:articles_21389 2023-09-05T13:13:32+02:00 Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability Schneider, David P. (author) Fogt, Ryan L. (author) 2018-01-28 https://doi.org/10.1002/2017GL076226 en eng Geophysical Research Letters--Geophys. Res. Lett.--00948276 The International Surface Pressure Databank version 3--10.5065/D6D50K29 articles:21389 ark:/85065/d7g73hdm doi:10.1002/2017GL076226 Copyright 2018 American Geophysical Union. article Text 2018 ftncar https://doi.org/10.1002/2017GL076226 2023-08-14T18:48:05Z Enabled by advances in data assimilation and the digitization of historical observations, atmospheric reanalysis products that span the entire twentieth century provide valuable gridded data over the sparsely observed high-latitude Southern Hemisphere. Here austral summer and winter surface pressure trends in three reanalyses are compared to trends in a statistically based pressure reconstruction, trends in atmospheric models without data assimilation, and estimates of uncertainty from the reanalyses. In austral summer during the early twentieth century, the reanalyses underestimate the depth of the circumpolar trough, leading to erroneously high pressure values over the region. Around 1950, a rapid increase in the number of assimilated pressure observations leads to a dramatic reduction in the reanalyses standard error and a spurious drop in the surface pressure. A more likely history of the surface pressure over this region is provided by the reconstruction, which is consistent with the model simulations without data assimilation. PLR-1341527 Article in Journal/Newspaper Antarc* Antarctica OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Austral Geophysical Research Letters 45 2 964 973 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Enabled by advances in data assimilation and the digitization of historical observations, atmospheric reanalysis products that span the entire twentieth century provide valuable gridded data over the sparsely observed high-latitude Southern Hemisphere. Here austral summer and winter surface pressure trends in three reanalyses are compared to trends in a statistically based pressure reconstruction, trends in atmospheric models without data assimilation, and estimates of uncertainty from the reanalyses. In austral summer during the early twentieth century, the reanalyses underestimate the depth of the circumpolar trough, leading to erroneously high pressure values over the region. Around 1950, a rapid increase in the number of assimilated pressure observations leads to a dramatic reduction in the reanalyses standard error and a spurious drop in the surface pressure. A more likely history of the surface pressure over this region is provided by the reconstruction, which is consistent with the model simulations without data assimilation. PLR-1341527 |
author2 |
Schneider, David P. (author) Fogt, Ryan L. (author) |
format |
Article in Journal/Newspaper |
title |
Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability |
spellingShingle |
Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability |
title_short |
Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability |
title_full |
Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability |
title_fullStr |
Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability |
title_full_unstemmed |
Artifacts in century-length atmospheric and coupled reanalyses over Antarctica due to historical data availability |
title_sort |
artifacts in century-length atmospheric and coupled reanalyses over antarctica due to historical data availability |
publishDate |
2018 |
url |
https://doi.org/10.1002/2017GL076226 |
geographic |
Austral |
geographic_facet |
Austral |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
Geophysical Research Letters--Geophys. Res. Lett.--00948276 The International Surface Pressure Databank version 3--10.5065/D6D50K29 articles:21389 ark:/85065/d7g73hdm doi:10.1002/2017GL076226 |
op_rights |
Copyright 2018 American Geophysical Union. |
op_doi |
https://doi.org/10.1002/2017GL076226 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
2 |
container_start_page |
964 |
op_container_end_page |
973 |
_version_ |
1776204770304851968 |