Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ...
Southern Ocean shortwave radiation biases of up to 40 Wm-2 in summer are common in general circulation models, with misrepresentation of cloud identified as the major cause. We evaluate the atmospheric component GA7.0 and GA7.1 of the HadGEM3 general circulation model and the MERRA-2 reanalysis, and...
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ftdatacite:10.5281/zenodo.3764274 2024-02-04T10:04:40+01:00 Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... Kuma, Peter McDonald, Adrian Morgenstern, Olaf Parsons, Simon Hartery, Sean Alexander, Simon P. Cassano, John J. Garrett, Sally Harvey, Mike J. Plank, Graeme Williams, Jonny 2019 https://dx.doi.org/10.5281/zenodo.3764274 https://zenodo.org/doi/10.5281/zenodo.3764274 en eng Zenodo https://dx.doi.org/10.5281/zenodo.3764275 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 ScholarlyArticle Poster Text article-journal 2019 ftdatacite https://doi.org/10.5281/zenodo.376427410.5281/zenodo.3764275 2024-01-05T01:01:48Z Southern Ocean shortwave radiation biases of up to 40 Wm-2 in summer are common in general circulation models, with misrepresentation of cloud identified as the major cause. We evaluate the atmospheric component GA7.0 and GA7.1 of the HadGEM3 general circulation model and the MERRA-2 reanalysis, and find that GA7.0 and GA7.1 underestimate the reflected top of atmosphere shortwave radiation, while MERRA-2 overestimates this quantity. Using a dataset of ship ceilometer and radiosonde observations we evaluate cloud cover and link it to the thermodynamic profile. We find low cloud below 2 km and fog predominant and cloud cover exceeding 90% in most regions. We show that this cloud is strongly linked to boundary layer stability and sea surface temperature. Using a ground-based lidar simulator we produce virtual ceilometer measurements along the voyage tracks for a 1:1 comparison with the ceilometer measurements. We find that GA7.0 and MERRA-2 underestimate cloud cover by 18–25%, especially cloud below 1 km and ... Text Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Merra ENVELOPE(12.615,12.615,65.816,65.816) Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
Southern Ocean shortwave radiation biases of up to 40 Wm-2 in summer are common in general circulation models, with misrepresentation of cloud identified as the major cause. We evaluate the atmospheric component GA7.0 and GA7.1 of the HadGEM3 general circulation model and the MERRA-2 reanalysis, and find that GA7.0 and GA7.1 underestimate the reflected top of atmosphere shortwave radiation, while MERRA-2 overestimates this quantity. Using a dataset of ship ceilometer and radiosonde observations we evaluate cloud cover and link it to the thermodynamic profile. We find low cloud below 2 km and fog predominant and cloud cover exceeding 90% in most regions. We show that this cloud is strongly linked to boundary layer stability and sea surface temperature. Using a ground-based lidar simulator we produce virtual ceilometer measurements along the voyage tracks for a 1:1 comparison with the ceilometer measurements. We find that GA7.0 and MERRA-2 underestimate cloud cover by 18–25%, especially cloud below 1 km and ... |
format |
Text |
author |
Kuma, Peter McDonald, Adrian Morgenstern, Olaf Parsons, Simon Hartery, Sean Alexander, Simon P. Cassano, John J. Garrett, Sally Harvey, Mike J. Plank, Graeme Williams, Jonny |
spellingShingle |
Kuma, Peter McDonald, Adrian Morgenstern, Olaf Parsons, Simon Hartery, Sean Alexander, Simon P. Cassano, John J. Garrett, Sally Harvey, Mike J. Plank, Graeme Williams, Jonny Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... |
author_facet |
Kuma, Peter McDonald, Adrian Morgenstern, Olaf Parsons, Simon Hartery, Sean Alexander, Simon P. Cassano, John J. Garrett, Sally Harvey, Mike J. Plank, Graeme Williams, Jonny |
author_sort |
Kuma, Peter |
title |
Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... |
title_short |
Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... |
title_full |
Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... |
title_fullStr |
Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... |
title_full_unstemmed |
Evaluation of Southern Ocean cloud in the HadGEM3 general circulation model and MERRA-2 reanalysis using ship-based observations ... |
title_sort |
evaluation of southern ocean cloud in the hadgem3 general circulation model and merra-2 reanalysis using ship-based observations ... |
publisher |
Zenodo |
publishDate |
2019 |
url |
https://dx.doi.org/10.5281/zenodo.3764274 https://zenodo.org/doi/10.5281/zenodo.3764274 |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Merra Southern Ocean |
geographic_facet |
Merra Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.5281/zenodo.3764275 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.5281/zenodo.376427410.5281/zenodo.3764275 |
_version_ |
1789973309881843712 |