Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations
The fidelity of a prerelease Energy Exascale Earth System Model (E3SM) in reproducing atmospheric blocking is evaluated with ~100- and ~25-km horizontal resolution within ensembles of simulations with Atmospheric Modeling Intercomparison Protocol-type active atmosphere and land surface configuration...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | http://www.osti.gov/servlets/purl/1497951 https://www.osti.gov/biblio/1497951 https://doi.org/10.1029/2018jd028892 |
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ftosti:oai:osti.gov:1497951 2023-07-30T04:05:15+02:00 Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations Jiang, Tianyu Evans, Katherine J. Branstetter, Marcia Caldwell, Peter Neale, Richard Rasch, Philip J. Tang, Qi Xie, Shaocheng 2022-03-31 application/pdf http://www.osti.gov/servlets/purl/1497951 https://www.osti.gov/biblio/1497951 https://doi.org/10.1029/2018jd028892 unknown http://www.osti.gov/servlets/purl/1497951 https://www.osti.gov/biblio/1497951 https://doi.org/10.1029/2018jd028892 doi:10.1029/2018jd028892 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1029/2018jd028892 2023-07-11T09:31:44Z The fidelity of a prerelease Energy Exascale Earth System Model (E3SM) in reproducing atmospheric blocking is evaluated with ~100- and ~25-km horizontal resolution within ensembles of simulations with Atmospheric Modeling Intercomparison Protocol-type active atmosphere and land surface configurations. This evaluation is conducted via a hybrid bidimensional blocking index based on geopotential height. The lower-resolution model correctly reproduces the spatial distribution of blocking frequency maxima over the Northern Hemisphere. However, it overestimates the blocking frequency over western North America, the Pacific Northeast, and Eastern Europe regions and largely underestimates blocking frequency over the North Atlantic. The high-resolution model significantly reduces the bias over the North Pacific region, particularly over western North America, but the biases over the North Atlantic blocking sector mostly persist. A diagnosis of the mean flow reveals that the subtropical jet is displaced poleward in the high-resolution model with a jet core speed that is generally more realistic. A time scale analysis of eddies suggests that synoptic eddies associated with the blocking events are increased in the high-resolution configuration. The discrepancy between the models implies that both synoptic and low-frequency eddies play significant roles in determining North Pacific blocking, whereas North Atlantic blocking is mainly driven by low-frequency eddies. The characteristic time scale associated with blocking events is also investigated, and it shows that both model resolutions produce events that are overly persistent. However, the bias in the high-resolution model is reduced, which reflects more efficient energy dispersion with higher resolution. Other/Unknown Material North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Pacific Journal of Geophysical Research: Atmospheres 124 5 2465 2482 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Jiang, Tianyu Evans, Katherine J. Branstetter, Marcia Caldwell, Peter Neale, Richard Rasch, Philip J. Tang, Qi Xie, Shaocheng Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
The fidelity of a prerelease Energy Exascale Earth System Model (E3SM) in reproducing atmospheric blocking is evaluated with ~100- and ~25-km horizontal resolution within ensembles of simulations with Atmospheric Modeling Intercomparison Protocol-type active atmosphere and land surface configurations. This evaluation is conducted via a hybrid bidimensional blocking index based on geopotential height. The lower-resolution model correctly reproduces the spatial distribution of blocking frequency maxima over the Northern Hemisphere. However, it overestimates the blocking frequency over western North America, the Pacific Northeast, and Eastern Europe regions and largely underestimates blocking frequency over the North Atlantic. The high-resolution model significantly reduces the bias over the North Pacific region, particularly over western North America, but the biases over the North Atlantic blocking sector mostly persist. A diagnosis of the mean flow reveals that the subtropical jet is displaced poleward in the high-resolution model with a jet core speed that is generally more realistic. A time scale analysis of eddies suggests that synoptic eddies associated with the blocking events are increased in the high-resolution configuration. The discrepancy between the models implies that both synoptic and low-frequency eddies play significant roles in determining North Pacific blocking, whereas North Atlantic blocking is mainly driven by low-frequency eddies. The characteristic time scale associated with blocking events is also investigated, and it shows that both model resolutions produce events that are overly persistent. However, the bias in the high-resolution model is reduced, which reflects more efficient energy dispersion with higher resolution. |
author |
Jiang, Tianyu Evans, Katherine J. Branstetter, Marcia Caldwell, Peter Neale, Richard Rasch, Philip J. Tang, Qi Xie, Shaocheng |
author_facet |
Jiang, Tianyu Evans, Katherine J. Branstetter, Marcia Caldwell, Peter Neale, Richard Rasch, Philip J. Tang, Qi Xie, Shaocheng |
author_sort |
Jiang, Tianyu |
title |
Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations |
title_short |
Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations |
title_full |
Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations |
title_fullStr |
Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations |
title_full_unstemmed |
Northern Hemisphere Blocking in ~25-km-Resolution E3SM v0.3 Atmosphere-Land Simulations |
title_sort |
northern hemisphere blocking in ~25-km-resolution e3sm v0.3 atmosphere-land simulations |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1497951 https://www.osti.gov/biblio/1497951 https://doi.org/10.1029/2018jd028892 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1497951 https://www.osti.gov/biblio/1497951 https://doi.org/10.1029/2018jd028892 doi:10.1029/2018jd028892 |
op_doi |
https://doi.org/10.1029/2018jd028892 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
124 |
container_issue |
5 |
container_start_page |
2465 |
op_container_end_page |
2482 |
_version_ |
1772817054258167808 |