Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales
Unforced global mean surface air temperature (T) is stable in the long term primarily because warm T anomalies are associated with enhanced outgoing longwave radiation (↑LW) to space and thus a negative net radiative energy flux (N, positive downward) at the top of the atmosphere (TOA). However, it...
id |
ftunivsthongkong:oai:repository.hkust.edu.hk:1783.1-120369 |
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openpolar |
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Open Polar |
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The Hong Kong University of Science and Technology: HKUST Institutional Repository |
op_collection_id |
ftunivsthongkong |
language |
English |
topic |
Atm/Ocean Structure/Phenomena Cloud radiative effects El Nino Feedback Interannual variability Longwave radiation Physical Meteorology and Climatology Surface temperature Variability |
spellingShingle |
Atm/Ocean Structure/Phenomena Cloud radiative effects El Nino Feedback Interannual variability Longwave radiation Physical Meteorology and Climatology Surface temperature Variability Brown, Patrick T. Li, Wenhong Jiang, Jonathan H. Su, Hui Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales |
topic_facet |
Atm/Ocean Structure/Phenomena Cloud radiative effects El Nino Feedback Interannual variability Longwave radiation Physical Meteorology and Climatology Surface temperature Variability |
description |
Unforced global mean surface air temperature (T) is stable in the long term primarily because warm T anomalies are associated with enhanced outgoing longwave radiation (↑LW) to space and thus a negative net radiative energy flux (N, positive downward) at the top of the atmosphere (TOA). However, it is shown here that, with the exception of high latitudinal and specific continental regions, warm unforced surface air temperature anomalies at the local spatial scale [T(θ, φ), where (θ, φ) = (latitude, longitude)] tend to be associated with anomalously positive N(θ, φ). It is revealed that this occurs mainly because warm T(θ, φ) anomalies are accompanied by anomalously low surface albedo near sea ice margins and over high altitudes, low cloud albedo over much of the middle and low latitudes, and a large water vapor greenhouse effect over the deep Indo-Pacific. It is shown here that the negative N versus T relationship arises because warm anomalies are associated with large divergence of atmospheric energy transport over the tropical Pacific [where the N(θ, φ) versus T(θ, φ) relationship tends to be positive] and convergence of atmospheric energy transport at high latitudes [where the N(θ, φ) versus T(θ, φ) relationship tends to be negative]. Additionally, the characteristic surface temperature pattern contains anomalously cool regions where a positive local N(θ, φ) versus T(θ, φ) relationship helps induce negative N. Finally, large-scale atmospheric circulation changes play a critical role in the production of the negative N versus T relationship as they drive cloud reduction and atmospheric drying over large portions of the tropics and subtropics, which allows for greatly enhanced ↑LW. © 2016 American Meteorological Society. |
format |
Article in Journal/Newspaper |
author |
Brown, Patrick T. Li, Wenhong Jiang, Jonathan H. Su, Hui |
author_facet |
Brown, Patrick T. Li, Wenhong Jiang, Jonathan H. Su, Hui |
author_sort |
Brown, Patrick T. |
title |
Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales |
title_short |
Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales |
title_full |
Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales |
title_fullStr |
Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales |
title_full_unstemmed |
Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales |
title_sort |
unforced surface air temperature variability and its contrasting relationship with the anomalous toa energy flux at local and global spatial scales |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
https://repository.hkust.edu.hk/ir/Record/1783.1-120369 https://doi.org/10.1175/JCLI-D-15-0384.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0894-8755&rft.volume=29&rft.issue=3&rft.date=2016&rft.spage=925&rft.aulast=Brown&rft.aufirst=P.T.&rft.atitle=Unforced+surface+air+temperature+variability+and+its+contrasting+relationship+with+the+anomalous+TOA+energy+flux+at+local+and+global+spatial+scales&rft.title=Journal+of+Climate http://www.scopus.com/record/display.url?eid=2-s2.0-84957831209&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000369279500003 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://repository.hkust.edu.hk/ir/Record/1783.1-120369 Journal of Climate, v. 29, (3), February 2016, p. 925-940 0894-8755 1520-0442 https://doi.org/10.1175/JCLI-D-15-0384.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0894-8755&rft.volume=29&rft.issue=3&rft.date=2016&rft.spage=925&rft.aulast=Brown&rft.aufirst=P.T.&rft.atitle=Unforced+surface+air+temperature+variability+and+its+contrasting+relationship+with+the+anomalous+TOA+energy+flux+at+local+and+global+spatial+scales&rft.title=Journal+of+Climate http://www.scopus.com/record/display.url?eid=2-s2.0-84957831209&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000369279500003 |
op_doi |
https://doi.org/10.1175/JCLI-D-15-0384.1 |
container_title |
Journal of Climate |
container_volume |
29 |
container_issue |
3 |
container_start_page |
925 |
op_container_end_page |
940 |
_version_ |
1766195615995265024 |
spelling |
ftunivsthongkong:oai:repository.hkust.edu.hk:1783.1-120369 2023-05-15T18:18:52+02:00 Unforced surface air temperature variability and its contrasting relationship with the anomalous TOA energy flux at local and global spatial scales Brown, Patrick T. Li, Wenhong Jiang, Jonathan H. Su, Hui 2016 https://repository.hkust.edu.hk/ir/Record/1783.1-120369 https://doi.org/10.1175/JCLI-D-15-0384.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0894-8755&rft.volume=29&rft.issue=3&rft.date=2016&rft.spage=925&rft.aulast=Brown&rft.aufirst=P.T.&rft.atitle=Unforced+surface+air+temperature+variability+and+its+contrasting+relationship+with+the+anomalous+TOA+energy+flux+at+local+and+global+spatial+scales&rft.title=Journal+of+Climate http://www.scopus.com/record/display.url?eid=2-s2.0-84957831209&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000369279500003 English eng American Meteorological Society https://repository.hkust.edu.hk/ir/Record/1783.1-120369 Journal of Climate, v. 29, (3), February 2016, p. 925-940 0894-8755 1520-0442 https://doi.org/10.1175/JCLI-D-15-0384.1 http://lbdiscover.ust.hk/uresolver?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rfr_id=info:sid/HKUST:SPI&rft.genre=article&rft.issn=0894-8755&rft.volume=29&rft.issue=3&rft.date=2016&rft.spage=925&rft.aulast=Brown&rft.aufirst=P.T.&rft.atitle=Unforced+surface+air+temperature+variability+and+its+contrasting+relationship+with+the+anomalous+TOA+energy+flux+at+local+and+global+spatial+scales&rft.title=Journal+of+Climate http://www.scopus.com/record/display.url?eid=2-s2.0-84957831209&origin=inward http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=LinksAMR&SrcApp=PARTNER_APP&DestLinkType=FullRecord&DestApp=WOS&KeyUT=000369279500003 Atm/Ocean Structure/Phenomena Cloud radiative effects El Nino Feedback Interannual variability Longwave radiation Physical Meteorology and Climatology Surface temperature Variability Article 2016 ftunivsthongkong https://doi.org/10.1175/JCLI-D-15-0384.1 2022-10-07T00:07:38Z Unforced global mean surface air temperature (T) is stable in the long term primarily because warm T anomalies are associated with enhanced outgoing longwave radiation (↑LW) to space and thus a negative net radiative energy flux (N, positive downward) at the top of the atmosphere (TOA). However, it is shown here that, with the exception of high latitudinal and specific continental regions, warm unforced surface air temperature anomalies at the local spatial scale [T(θ, φ), where (θ, φ) = (latitude, longitude)] tend to be associated with anomalously positive N(θ, φ). It is revealed that this occurs mainly because warm T(θ, φ) anomalies are accompanied by anomalously low surface albedo near sea ice margins and over high altitudes, low cloud albedo over much of the middle and low latitudes, and a large water vapor greenhouse effect over the deep Indo-Pacific. It is shown here that the negative N versus T relationship arises because warm anomalies are associated with large divergence of atmospheric energy transport over the tropical Pacific [where the N(θ, φ) versus T(θ, φ) relationship tends to be positive] and convergence of atmospheric energy transport at high latitudes [where the N(θ, φ) versus T(θ, φ) relationship tends to be negative]. Additionally, the characteristic surface temperature pattern contains anomalously cool regions where a positive local N(θ, φ) versus T(θ, φ) relationship helps induce negative N. Finally, large-scale atmospheric circulation changes play a critical role in the production of the negative N versus T relationship as they drive cloud reduction and atmospheric drying over large portions of the tropics and subtropics, which allows for greatly enhanced ↑LW. © 2016 American Meteorological Society. Article in Journal/Newspaper Sea ice The Hong Kong University of Science and Technology: HKUST Institutional Repository Pacific Journal of Climate 29 3 925 940 |