Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM
The response of atmospheric blocks and the wave amplitude of midlatitude jets to changes in the midlatitude to pole, near-surface temperature difference (Delta T), is studied using an idealized dry general circulation model (GCM) with Held-Suarez forcing. Decreasing Delta T results in slower zonal w...
Published in: | Geophysical Research Letters |
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American Geophysical Union
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Online Access: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:41534233 https://doi.org/10.1002/2014GL060764 |
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ftharvardudash:oai:dash.harvard.edu:1/41534233 2023-05-15T15:03:24+02:00 Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM Hassanzadeh, Pedram Kuang, Zhiming Farrell, Brian F. 2014 application/pdf http://nrs.harvard.edu/urn-3:HUL.InstRepos:41534233 https://doi.org/10.1002/2014GL060764 en_US eng American Geophysical Union Geophysical Research Letters Hassanzadeh, Pedram, Zhiming Kuang, and Brian F. Farrell. 2014. “Responses of Midlatitude Blocks and Wave Amplitude to Changes in the Meridional Temperature Gradient in an Idealized Dry GCM.” Geophysical Research Letters41 (14): 5223–32. https://doi.org/10.1002/2014GL060764. 0094-8276 1944-8007 http://nrs.harvard.edu/urn-3:HUL.InstRepos:41534233 doi:10.1002/2014GL060764 Journal Article 2014 ftharvardudash https://doi.org/10.1002/2014GL060764 2022-04-05T18:54:55Z The response of atmospheric blocks and the wave amplitude of midlatitude jets to changes in the midlatitude to pole, near-surface temperature difference (Delta T), is studied using an idealized dry general circulation model (GCM) with Held-Suarez forcing. Decreasing Delta T results in slower zonal winds, a mean state with reduced meridional gradient of the 500 hPa geopotential height (Z500), a smaller variance of Z500 anomalies, and a robust decrease in blocks and meridional amplitude of waves. Neglecting the decrease of variance associated with reduced Delta T would lead to the incorrect expectation that mean states with smaller Z500 gradients produce more blocks and higher wave amplitudes. Our results suggest further investigation of the hypothesis that reduced Delta T due to Arctic Amplification would increase blocking events and wave amplitude, hence leading to more midlatitude extreme weather events. Version of Record Article in Journal/Newspaper Arctic Harvard University: DASH - Digital Access to Scholarship at Harvard Arctic Suarez ENVELOPE(-145.700,-145.700,-86.450,-86.450) Geophysical Research Letters 41 14 5223 5232 |
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Open Polar |
collection |
Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
description |
The response of atmospheric blocks and the wave amplitude of midlatitude jets to changes in the midlatitude to pole, near-surface temperature difference (Delta T), is studied using an idealized dry general circulation model (GCM) with Held-Suarez forcing. Decreasing Delta T results in slower zonal winds, a mean state with reduced meridional gradient of the 500 hPa geopotential height (Z500), a smaller variance of Z500 anomalies, and a robust decrease in blocks and meridional amplitude of waves. Neglecting the decrease of variance associated with reduced Delta T would lead to the incorrect expectation that mean states with smaller Z500 gradients produce more blocks and higher wave amplitudes. Our results suggest further investigation of the hypothesis that reduced Delta T due to Arctic Amplification would increase blocking events and wave amplitude, hence leading to more midlatitude extreme weather events. Version of Record |
format |
Article in Journal/Newspaper |
author |
Hassanzadeh, Pedram Kuang, Zhiming Farrell, Brian F. |
spellingShingle |
Hassanzadeh, Pedram Kuang, Zhiming Farrell, Brian F. Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM |
author_facet |
Hassanzadeh, Pedram Kuang, Zhiming Farrell, Brian F. |
author_sort |
Hassanzadeh, Pedram |
title |
Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM |
title_short |
Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM |
title_full |
Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM |
title_fullStr |
Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM |
title_full_unstemmed |
Responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry GCM |
title_sort |
responses of midlatitude blocks and wave amplitude to changes in the meridional temperature gradient in an idealized dry gcm |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:41534233 https://doi.org/10.1002/2014GL060764 |
long_lat |
ENVELOPE(-145.700,-145.700,-86.450,-86.450) |
geographic |
Arctic Suarez |
geographic_facet |
Arctic Suarez |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Geophysical Research Letters Hassanzadeh, Pedram, Zhiming Kuang, and Brian F. Farrell. 2014. “Responses of Midlatitude Blocks and Wave Amplitude to Changes in the Meridional Temperature Gradient in an Idealized Dry GCM.” Geophysical Research Letters41 (14): 5223–32. https://doi.org/10.1002/2014GL060764. 0094-8276 1944-8007 http://nrs.harvard.edu/urn-3:HUL.InstRepos:41534233 doi:10.1002/2014GL060764 |
op_doi |
https://doi.org/10.1002/2014GL060764 |
container_title |
Geophysical Research Letters |
container_volume |
41 |
container_issue |
14 |
container_start_page |
5223 |
op_container_end_page |
5232 |
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1766335251169148928 |