Summertime Transport Pathways From Different Northern Hemisphere Regions Into the Arctic

被引:10
|
作者
Zheng, Cheng [1 ]
Wu, Yutian [1 ]
Ting, Mingfang [1 ]
Orbe, Clara [2 ]
Wang, Xinyue [3 ]
Tilmes, Simone [3 ]
机构
[1] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
[2] NASA, Goddard Inst Space Studies, New York, NY 10025 USA
[3] Natl Ctr Atmospher Res, Atmospher Chem Observat & Modeling Lab, POB 3000, Boulder, CO 80307 USA
基金
美国国家科学基金会;
关键词
ASIAN MONSOON ANTICYCLONE; BLACK CARBON; CLIMATE SIMULATIONS; SOURCE ATTRIBUTION; TRANSIT-TIME; POLLUTION; MODEL; AIR; DISTRIBUTIONS; STRATOSPHERE;
D O I
10.1029/2020JD033811
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Trace gases and aerosols play an important role in Arctic chemistry and climate. As most Arctic tracers and aerosols are transported from midlatitude source regions, long-range transport into the Arctic is one of the key factors to understand the current and future states of Arctic climate. While previous studies have investigated the airmass fraction and transit time distribution in the Arctic, the actual transport pathways and their underlying dynamics and efficiencies are yet to be understood. In this study, we implement a large ensemble of idealized tagged pulse passive tracers in the Whole Atmosphere Community Climate Model version 5 to identify and analyze summertime transport pathways from different Northern Hemisphere surface regions into the Arctic. Three different transport pathways are identified as those associated with fast, intermediate and slow time scales. Midlatitude tracers can be transported into the Arctic in the troposphere via the fast transport pathway (similar to 8 days), which moves tracers northward from the source region mainly through transient eddies. For the intermediate transport pathway, which happens on 1-3 weeks' time scales, midlatitude tracers are first zonally transported by the jet stream, and then advected northward into the Arctic over Alaska and northern North Atlantic. Tropical and subtropical tracers are transported into the Arctic lower stratosphere via the slow transport pathway (1-3 months), as the tracers are lifted upward into the tropical and subtropical lower stratosphere, and then transported into the Arctic following the isentropic surfaces.
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页数:23
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