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Summertime Transport Pathways from Different Northern Hemisphere Regions into the ArcticTrace 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 (~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.
Document ID
20205007200
Acquisition Source
Goddard Space Flight Center
Document Type
Accepted Manuscript (Version with final changes)
Authors
Cheng Zheng ORCID
(Lamont-Doherty Earth Observatory Sparkill, New York, United States)
Yutian Wu ORCID
(Lamont-Doherty Earth Observatory Sparkill, New York, United States)
Mingfang Ting ORCID
(Lamont-Doherty Earth Observatory Sparkill, New York, United States)
Clara Orbe ORCID
(Goddard Institute for Space Studies New York, New York, United States)
Xinyue Wang ORCID
(National Center for Atmospheric Research Boulder, Colorado, United States)
Simone Tilmes ORCID
(National Center for Atmospheric Research Boulder, Colorado, United States)
Date Acquired
September 3, 2020
Publication Date
February 1, 2021
Publication Information
Publication: Journal of Geophysical Research: Atmospheres
Publisher: American Geophysical Union
Volume: 126
Issue: 4
Issue Publication Date: February 27, 2021
ISSN: 2169-897X
e-ISSN: 2169-8996
Subject Category
Meteorology And Climatology
Funding Number(s)
WBS: 281945.02.31.04.14
CONTRACT_GRANT: NSF OPP‐1825858
CONTRACT_GRANT: NSF AGS‐1802248
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
External Peer Committee
Keywords
Trace gases
Aerosols
Arctic
Transport
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