Air Mass Origin in the Arctic and its Response to Future Warming
We present the first climatology of air mass origin in the Arctic in terms of rigorously defined air mass fractions that partition air according to where it last contacted the planetary boundary layer (PBL). Results from a present-day climate integration of the GEOSCCM general circulation model reve...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20160000353 2023-05-15T14:34:18+02:00 Air Mass Origin in the Arctic and its Response to Future Warming Orbe, Clara Li, Feng Waugh, Darryn W. Oman, Luke Holzer, Mark Newman, Paul A. Polvani, Lorenzo M. Unclassified, Unlimited, Publicly available December 15, 2014 application/pdf http://hdl.handle.net/2060/20160000353 unknown Document ID: 20160000353 http://hdl.handle.net/2060/20160000353 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC-E-DAA-TN20210 AGU Fall Meeting 2014; 15-19 Dec. 2014; San Francisco, CA; United States 2014 ftnasantrs 2019-07-20T23:58:38Z We present the first climatology of air mass origin in the Arctic in terms of rigorously defined air mass fractions that partition air according to where it last contacted the planetary boundary layer (PBL). Results from a present-day climate integration of the GEOSCCM general circulation model reveal that the Arctic lower troposphere below 700 mb is dominated year round by air whose last PBL contact occurred poleward of 60degN, (Arctic air, or air of Arctic origin). By comparison, approx. 63% of the Arctic troposphere above 700 mb originates in the NH midlatitude PBL, (midlatitude air). Although seasonal changes in the total fraction of midlatitude air are small, there are dramatic changes in where that air last contacted the PBL, especially above 700 mb. Specifically, during winter air in the Arctic originates preferentially over the oceans, approx. 26% in the East Pacific, and approx. 20% in the Atlantic PBL. By comparison, during summer air in the Arctic last contacted the midlatitude PBL primarily over land, overwhelmingly so in Asia (approx. 40 %) and, to a lesser extent, in North America (approx. 24%). Seasonal changes in air-mass origin are interpreted in terms of seasonal variations in the large-scale ventilation of the midlatitude boundary layer and lower troposphere, namely changes in the midlatitude tropospheric jet and associated transient eddies during winter and large scale convective motions over midlatitudes during summer. Other/Unknown Material Arctic NASA Technical Reports Server (NTRS) Arctic Pacific |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
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topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Orbe, Clara Li, Feng Waugh, Darryn W. Oman, Luke Holzer, Mark Newman, Paul A. Polvani, Lorenzo M. Air Mass Origin in the Arctic and its Response to Future Warming |
topic_facet |
Meteorology and Climatology |
description |
We present the first climatology of air mass origin in the Arctic in terms of rigorously defined air mass fractions that partition air according to where it last contacted the planetary boundary layer (PBL). Results from a present-day climate integration of the GEOSCCM general circulation model reveal that the Arctic lower troposphere below 700 mb is dominated year round by air whose last PBL contact occurred poleward of 60degN, (Arctic air, or air of Arctic origin). By comparison, approx. 63% of the Arctic troposphere above 700 mb originates in the NH midlatitude PBL, (midlatitude air). Although seasonal changes in the total fraction of midlatitude air are small, there are dramatic changes in where that air last contacted the PBL, especially above 700 mb. Specifically, during winter air in the Arctic originates preferentially over the oceans, approx. 26% in the East Pacific, and approx. 20% in the Atlantic PBL. By comparison, during summer air in the Arctic last contacted the midlatitude PBL primarily over land, overwhelmingly so in Asia (approx. 40 %) and, to a lesser extent, in North America (approx. 24%). Seasonal changes in air-mass origin are interpreted in terms of seasonal variations in the large-scale ventilation of the midlatitude boundary layer and lower troposphere, namely changes in the midlatitude tropospheric jet and associated transient eddies during winter and large scale convective motions over midlatitudes during summer. |
format |
Other/Unknown Material |
author |
Orbe, Clara Li, Feng Waugh, Darryn W. Oman, Luke Holzer, Mark Newman, Paul A. Polvani, Lorenzo M. |
author_facet |
Orbe, Clara Li, Feng Waugh, Darryn W. Oman, Luke Holzer, Mark Newman, Paul A. Polvani, Lorenzo M. |
author_sort |
Orbe, Clara |
title |
Air Mass Origin in the Arctic and its Response to Future Warming |
title_short |
Air Mass Origin in the Arctic and its Response to Future Warming |
title_full |
Air Mass Origin in the Arctic and its Response to Future Warming |
title_fullStr |
Air Mass Origin in the Arctic and its Response to Future Warming |
title_full_unstemmed |
Air Mass Origin in the Arctic and its Response to Future Warming |
title_sort |
air mass origin in the arctic and its response to future warming |
publishDate |
2014 |
url |
http://hdl.handle.net/2060/20160000353 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
CASI |
op_relation |
Document ID: 20160000353 http://hdl.handle.net/2060/20160000353 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766307373979271168 |