Trends in the tropospheric general circulation from 1979 to 2022
Atmospheric general circulation changes from March 1979 to February 2022 are examined using the ERA5 reanalysis. Maps of linear trends and time series for specific areas are presented. Attention is concentrated on monthly, seasonal and annual means, but shorter-timescale variability is also consider...
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ftdoajarticles:oai:doaj.org/article:babba1c8aeef4e71bbbbf1876f57a1fd 2023-05-15T13:54:08+02:00 Trends in the tropospheric general circulation from 1979 to 2022 A. J. Simmons 2022-07-01T00:00:00Z https://doi.org/10.5194/wcd-3-777-2022 https://doaj.org/article/babba1c8aeef4e71bbbbf1876f57a1fd EN eng Copernicus Publications https://wcd.copernicus.org/articles/3/777/2022/wcd-3-777-2022.pdf https://doaj.org/toc/2698-4016 doi:10.5194/wcd-3-777-2022 2698-4016 https://doaj.org/article/babba1c8aeef4e71bbbbf1876f57a1fd Weather and Climate Dynamics, Vol 3, Pp 777-809 (2022) Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.5194/wcd-3-777-2022 2022-12-30T22:21:33Z Atmospheric general circulation changes from March 1979 to February 2022 are examined using the ERA5 reanalysis. Maps of linear trends and time series for specific areas are presented. Attention is concentrated on monthly, seasonal and annual means, but shorter-timescale variability is also considered, including extremes. Changes in near-tropopause winds are the main focus, but related changes in temperature, wind and other variables throughout the troposphere are discussed. Middle- and upper-tropospheric warming is larger in the subtropics and outer tropics than in the deep tropics, except over the Pacific. This is linked with a strengthening and meridional expansion of the tropical easterlies that has received little previous attention. The change occurs predominantly over the first half of the period. Warming over several mid-latitude and subtropical land areas comes close to matching the large warming of the Arctic, in some seasons at least. Westerly upper-level winds in general weaken over the Arctic in winter but strengthen in northern middle latitudes, contrary to arguments based on circulation changes due solely to amplified Arctic warming. The jet-stream region over the eastern North Atlantic and western Europe shifts southward. Westerlies strengthen in a band stretching south-eastwards from the tropical western Pacific to southern Australia, as well as in the polar-jet-stream region that surrounds Antarctica. Extreme jet-stream winds increase over the North Atlantic. Net kinetic energy also increases, mostly associated with sub-monthly variability along the mid-latitude storm tracks and over the tropical Pacific. Available potential energy changes less. Geopotential height shows a distinct pattern of change in stationary long-wave structures. There are increases in surface pressure over the North Pacific and southern mid-latitudes and decreases over the Arctic Ocean and offshore of Antarctica. Several comparisons are made between ERA5 and the JRA-55 reanalysis and between ERA5 and the observations it ... Article in Journal/Newspaper Antarc* Antarctica Arctic Arctic Ocean North Atlantic Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Pacific Weather and Climate Dynamics 3 3 777 809 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Meteorology. Climatology QC851-999 |
spellingShingle |
Meteorology. Climatology QC851-999 A. J. Simmons Trends in the tropospheric general circulation from 1979 to 2022 |
topic_facet |
Meteorology. Climatology QC851-999 |
description |
Atmospheric general circulation changes from March 1979 to February 2022 are examined using the ERA5 reanalysis. Maps of linear trends and time series for specific areas are presented. Attention is concentrated on monthly, seasonal and annual means, but shorter-timescale variability is also considered, including extremes. Changes in near-tropopause winds are the main focus, but related changes in temperature, wind and other variables throughout the troposphere are discussed. Middle- and upper-tropospheric warming is larger in the subtropics and outer tropics than in the deep tropics, except over the Pacific. This is linked with a strengthening and meridional expansion of the tropical easterlies that has received little previous attention. The change occurs predominantly over the first half of the period. Warming over several mid-latitude and subtropical land areas comes close to matching the large warming of the Arctic, in some seasons at least. Westerly upper-level winds in general weaken over the Arctic in winter but strengthen in northern middle latitudes, contrary to arguments based on circulation changes due solely to amplified Arctic warming. The jet-stream region over the eastern North Atlantic and western Europe shifts southward. Westerlies strengthen in a band stretching south-eastwards from the tropical western Pacific to southern Australia, as well as in the polar-jet-stream region that surrounds Antarctica. Extreme jet-stream winds increase over the North Atlantic. Net kinetic energy also increases, mostly associated with sub-monthly variability along the mid-latitude storm tracks and over the tropical Pacific. Available potential energy changes less. Geopotential height shows a distinct pattern of change in stationary long-wave structures. There are increases in surface pressure over the North Pacific and southern mid-latitudes and decreases over the Arctic Ocean and offshore of Antarctica. Several comparisons are made between ERA5 and the JRA-55 reanalysis and between ERA5 and the observations it ... |
format |
Article in Journal/Newspaper |
author |
A. J. Simmons |
author_facet |
A. J. Simmons |
author_sort |
A. J. Simmons |
title |
Trends in the tropospheric general circulation from 1979 to 2022 |
title_short |
Trends in the tropospheric general circulation from 1979 to 2022 |
title_full |
Trends in the tropospheric general circulation from 1979 to 2022 |
title_fullStr |
Trends in the tropospheric general circulation from 1979 to 2022 |
title_full_unstemmed |
Trends in the tropospheric general circulation from 1979 to 2022 |
title_sort |
trends in the tropospheric general circulation from 1979 to 2022 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/wcd-3-777-2022 https://doaj.org/article/babba1c8aeef4e71bbbbf1876f57a1fd |
geographic |
Arctic Arctic Ocean Pacific |
geographic_facet |
Arctic Arctic Ocean Pacific |
genre |
Antarc* Antarctica Arctic Arctic Ocean North Atlantic |
genre_facet |
Antarc* Antarctica Arctic Arctic Ocean North Atlantic |
op_source |
Weather and Climate Dynamics, Vol 3, Pp 777-809 (2022) |
op_relation |
https://wcd.copernicus.org/articles/3/777/2022/wcd-3-777-2022.pdf https://doaj.org/toc/2698-4016 doi:10.5194/wcd-3-777-2022 2698-4016 https://doaj.org/article/babba1c8aeef4e71bbbbf1876f57a1fd |
op_doi |
https://doi.org/10.5194/wcd-3-777-2022 |
container_title |
Weather and Climate Dynamics |
container_volume |
3 |
container_issue |
3 |
container_start_page |
777 |
op_container_end_page |
809 |
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1766259781814714368 |