Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM
The amount of Arctic sea ice predicted by the Hadley Centre Global Climate Model (GCM) is evaluated using 15 years of passive-microwave data. While the Hadley model reproduces the seasonal cycle reasonably well, it underestimates the total area of sea ice by more than 3 x 10(6) km(2) for most of the...
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INT GLACIOLOGICAL SOC
1997
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ftucl:oai:eprints.ucl.ac.uk.OAI2:154907 2023-05-15T13:29:06+02:00 Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM Smith, DM Cooper, C Wingham, DJ Laxon, SW Walsh, JE 1997 http://discovery.ucl.ac.uk/154907/ unknown INT GLACIOLOGICAL SOC ANNALS OF GLACIOLOGY, VOL 25, 1997 , 25 423 - 428. (1997) Article 1997 ftucl 2016-01-21T23:11:26Z The amount of Arctic sea ice predicted by the Hadley Centre Global Climate Model (GCM) is evaluated using 15 years of passive-microwave data. While the Hadley model reproduces the seasonal cycle reasonably well, it underestimates the total area of sea ice by more than 3 x 10(6) km(2) for most of the year. In the winter months, most of the underestimate in ice area results from the prediction of far too little ice in Hudson Bay and the Sea of Okhotsk, leading to an excess of up to 0.2 PW heat input to the atmosphere from Hudson Bay alone. The surface-energy budget of Hudson Bay is investigated using a mixture of surface observations (POLES), satellite data (ATSR, SSM/I and ISCCP) and output from the Goddard Data Assimilation Office analysis. Flux adjustments of the order of 200 Wm(-2), resulting from anomalously high sea-surface temperatures in the Levitus (1982) climatology, are found to be the cause of the model's underestimation of sea ice in both Hudson Bay and the Sea of Okhotsk. The fact that flux adjustments based on an inaccurate climatology will produce errors, even if the model physics is correct, underlines the need both for improved climatologies and for models accurate enough not to require flux adjustment. Article in Journal/Newspaper Annals of Glaciology Arctic Hudson Bay Sea ice University College London: UCL Discovery Arctic Hudson Hudson Bay Okhotsk |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
description |
The amount of Arctic sea ice predicted by the Hadley Centre Global Climate Model (GCM) is evaluated using 15 years of passive-microwave data. While the Hadley model reproduces the seasonal cycle reasonably well, it underestimates the total area of sea ice by more than 3 x 10(6) km(2) for most of the year. In the winter months, most of the underestimate in ice area results from the prediction of far too little ice in Hudson Bay and the Sea of Okhotsk, leading to an excess of up to 0.2 PW heat input to the atmosphere from Hudson Bay alone. The surface-energy budget of Hudson Bay is investigated using a mixture of surface observations (POLES), satellite data (ATSR, SSM/I and ISCCP) and output from the Goddard Data Assimilation Office analysis. Flux adjustments of the order of 200 Wm(-2), resulting from anomalously high sea-surface temperatures in the Levitus (1982) climatology, are found to be the cause of the model's underestimation of sea ice in both Hudson Bay and the Sea of Okhotsk. The fact that flux adjustments based on an inaccurate climatology will produce errors, even if the model physics is correct, underlines the need both for improved climatologies and for models accurate enough not to require flux adjustment. |
author2 |
Walsh, JE |
format |
Article in Journal/Newspaper |
author |
Smith, DM Cooper, C Wingham, DJ Laxon, SW |
spellingShingle |
Smith, DM Cooper, C Wingham, DJ Laxon, SW Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM |
author_facet |
Smith, DM Cooper, C Wingham, DJ Laxon, SW |
author_sort |
Smith, DM |
title |
Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM |
title_short |
Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM |
title_full |
Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM |
title_fullStr |
Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM |
title_full_unstemmed |
Evaluation of the representation of Arctic sea ice in the UK Hadley Centre GCM |
title_sort |
evaluation of the representation of arctic sea ice in the uk hadley centre gcm |
publisher |
INT GLACIOLOGICAL SOC |
publishDate |
1997 |
url |
http://discovery.ucl.ac.uk/154907/ |
geographic |
Arctic Hudson Hudson Bay Okhotsk |
geographic_facet |
Arctic Hudson Hudson Bay Okhotsk |
genre |
Annals of Glaciology Arctic Hudson Bay Sea ice |
genre_facet |
Annals of Glaciology Arctic Hudson Bay Sea ice |
op_source |
ANNALS OF GLACIOLOGY, VOL 25, 1997 , 25 423 - 428. (1997) |
_version_ |
1765998497651228672 |