Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models
This study examines the dynamical mechanisms responsible for changes in midlatitude clouds and cloud radiative effects (CRE) that occur in conjunction with meridional shifts in the jet streams over the North Atlantic, North Pacific, and Southern Oceans. When the midlatitude jet shifts poleward, extr...
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ftncar:oai:drupal-site.org:articles_19398 2023-09-05T13:21:33+02:00 Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models Grise, Kevin M. (author) Medeiros, Brian (author) 2016-12 https://doi.org/10.1175/JCLI-D-16-0295.1 en eng Journal of Climate--J. Climate--0894-8755--1520-0442 articles:19398 ark:/85065/d70003w1 doi:10.1175/JCLI-D-16-0295.1 Copyright 2016 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. article Text 2016 ftncar https://doi.org/10.1175/JCLI-D-16-0295.1 2023-08-14T18:46:40Z This study examines the dynamical mechanisms responsible for changes in midlatitude clouds and cloud radiative effects (CRE) that occur in conjunction with meridional shifts in the jet streams over the North Atlantic, North Pacific, and Southern Oceans. When the midlatitude jet shifts poleward, extratropical cyclones and their associated upward vertical velocity anomalies closely follow. As a result, a poleward jet shift contributes to a poleward shift in high-topped storm-track clouds and their associated longwave CRE. However, when the jet shifts poleward, downward vertical velocity anomalies increase equatorward of the jet, contributing to an enhancement of the boundary layer estimated inversion strength (EIS) and an increase in low cloud amount there. Because shortwave CRE depends on the reflection of solar radiation by clouds in all layers, the shortwave cooling effects of midlatitude clouds increase with both upward vertical velocity anomalies and positive EIS anomalies. Over midlatitude oceans where a poleward jet shift contributes to positive EIS anomalies but downward vertical velocity anomalies, the two effects cancel, and net observed changes in shortwave CRE are small. Article in Journal/Newspaper North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Pacific Journal of Climate 29 24 9005 9025 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
This study examines the dynamical mechanisms responsible for changes in midlatitude clouds and cloud radiative effects (CRE) that occur in conjunction with meridional shifts in the jet streams over the North Atlantic, North Pacific, and Southern Oceans. When the midlatitude jet shifts poleward, extratropical cyclones and their associated upward vertical velocity anomalies closely follow. As a result, a poleward jet shift contributes to a poleward shift in high-topped storm-track clouds and their associated longwave CRE. However, when the jet shifts poleward, downward vertical velocity anomalies increase equatorward of the jet, contributing to an enhancement of the boundary layer estimated inversion strength (EIS) and an increase in low cloud amount there. Because shortwave CRE depends on the reflection of solar radiation by clouds in all layers, the shortwave cooling effects of midlatitude clouds increase with both upward vertical velocity anomalies and positive EIS anomalies. Over midlatitude oceans where a poleward jet shift contributes to positive EIS anomalies but downward vertical velocity anomalies, the two effects cancel, and net observed changes in shortwave CRE are small. |
author2 |
Grise, Kevin M. (author) Medeiros, Brian (author) |
format |
Article in Journal/Newspaper |
title |
Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
spellingShingle |
Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
title_short |
Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
title_full |
Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
title_fullStr |
Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
title_full_unstemmed |
Understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
title_sort |
understanding the varied influence of midlatitude jet position on clouds and cloud radiative effects in observations and global climate models |
publishDate |
2016 |
url |
https://doi.org/10.1175/JCLI-D-16-0295.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Journal of Climate--J. Climate--0894-8755--1520-0442 articles:19398 ark:/85065/d70003w1 doi:10.1175/JCLI-D-16-0295.1 |
op_rights |
Copyright 2016 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work. |
op_doi |
https://doi.org/10.1175/JCLI-D-16-0295.1 |
container_title |
Journal of Climate |
container_volume |
29 |
container_issue |
24 |
container_start_page |
9005 |
op_container_end_page |
9025 |
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1776202143551717376 |