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Evaluating Simulations of Interhemispheric Transport: Interhemispheric Exchange Time versus SF6 Age

Yang, Huang and Waugh, Darryn W. and Orbe, Clara and Patra, Prabir K. and Jöckel, Patrick and Lamarque, Jean-Francois and Tilmes, Simone and Kinnison, Douglas and Elkins, James W. and Dlugokencky, Edward J. (2019) Evaluating Simulations of Interhemispheric Transport: Interhemispheric Exchange Time versus SF6 Age. Geophysical Research Letters, 46 (2), pp. 1113-1120. Wiley. doi: 10.1029/2018GL080960. ISSN 0094-8276.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL080960


Two recent studies using SF6 observations to evaluate interhemispheric transport in two different ensembles of atmospheric chemistry models reached different conclusions on model performance. We show here that the different conclusions are due to the use of different metrics and not differences in the performance of the models. For both model ensembles, the multi‐model mean interhemispheric exchange time τex agrees well with observations, but in nearly all models the SF6 age in the southern hemisphere is older than observed. This occurs because transport from the northern extratropics into the tropics is too slow in most models, and the SF6 age is more sensitive to this bias than τex. Thus, simulating τex correctly does not necessarily mean that transport from northern midlatitudes into the southern hemisphere is correct. It also suggests that more attention needs to be paid to evaluating transport from northern midlatitudes into the tropics.

Item URL in elib:https://elib.dlr.de/126249/
Document Type:Article
Title:Evaluating Simulations of Interhemispheric Transport: Interhemispheric Exchange Time versus SF6 Age
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Yang, HuangJohn Hopkins Univ., Baltimore, MD, USAUNSPECIFIED
Waugh, Darryn W.John Hopkins Univ., Baltimore, MD, USAUNSPECIFIED
Orbe, ClaraNASA Goddard, New York, NY, USAUNSPECIFIED
Patra, Prabir K.JAMSTEC, Yokohama, JapanUNSPECIFIED
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Lamarque, Jean-FrancoisNCAR, Boulder, CO, USAUNSPECIFIED
Tilmes, SimoneNCAR, Boulder, CO, USAUNSPECIFIED
Kinnison, DouglasNCAR, Boulder, CO, USAUNSPECIFIED
Elkins, James W.NOAA, Boulder, CO, USAUNSPECIFIED
Dlugokencky, Edward J.NOAA, Boulder, CO, USAUNSPECIFIED
Date:30 January 2019
Journal or Publication Title:Geophysical Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1029/2018GL080960
Page Range:pp. 1113-1120
Keywords:Interhemispheric transport, SF6 metrics, climate models, CCMI, ESCiMo, EMAC, MESSy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds, R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:11 Feb 2019 10:50
Last Modified:27 May 2020 15:25

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