ETIN-MIP Extratropical-Tropical Interaction Model Intercomparison Project – protocol and initial results

Kang, Sarah M. and Hawcroft, Matt and Xiang, Baoqiang and Hwang, Yen-Ting and Cazes, Gabriel and Codron, Francis and Crueger, Traute and Deser, Clara and Hodnebrog, Oivind and Kim, Hanjun and Kim, Jiyeong and Kosaka, Yu and Losada, Teresa and Mechoso, Carlos R. and Myhre, Gunnar and Seland, Oyvind and Stevens, Bjorn and Watanabe, Masahiro and Yu, Sungduk (2019) ETIN-MIP Extratropical-Tropical Interaction Model Intercomparison Project – protocol and initial results. Bulletin of the American Meteorological Society, 100 (12). pp. 2589-2606. ISSN 0003-0007


Abstract

ETIN-MIP is a community-wide effort to improve dynamical understanding of the linkages between tropical precipitation and radiative biases in various regions, with implications for anthropogenic climate change and geoengineering.

This article introduces the Extratropical-Tropical Interaction Model Intercomparison Project (ETIN-MIP), where a set of fully coupled model experiments are designed to examine the sources of longstanding tropical precipitation biases in climate models. In particular, we reduce insolation over three targeted latitudinal bands of persistent model biases: the southern extratropics, the southern tropics and the northern extratropics. To address the effect of regional energy bias corrections on the mean distribution of tropical precipitation, such as the double Intertropical Convergence Zone problem, we evaluate the quasi-equilibrium response of the climate system corresponding to a 50-year period after the 100 years of prescribed energy perturbation. Initial results show that, despite a large inter-model spread in each perturbation experiment due to differences in ocean heat uptake response and climate feedbacks across models, the southern tropics is most efficient at driving a meridional shift of tropical precipitation. In contrast, the extratropical energy perturbations are effectively damped by anomalous heat uptake over the subpolar oceans, thereby inducing a smaller meridional shift of tropical precipitation compared with the tropical energy perturbations. The ETIN-MIP experiments allow us to investigate the global implications of regional energy bias corrections, providing a route to guide the practice of model development, with implications for understanding dynamical responses to anthropogenic climate change and geoengineering.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Accepted version published online: 30 August 2019. Permanent restricted access to Accepted version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Date Deposited: 09 Oct 2019 05:32
Last Modified: 14 Apr 2021 04:01
Uncontrolled Keywords: ETIN-MIP; Extratropical-Tropical Interaction Model Intercomparison Project; tropical precipitation; radiative biases; climate models
Fields of Research (2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040107 Meteorology
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Fields of Research (2020): 37 EARTH SCIENCES > 3701 Atmospheric sciences > 370108 Meteorology
37 EARTH SCIENCES > 3702 Climate change science > 370202 Climatology
Identification Number or DOI: https://doi.org/10.1175/BAMS-D-18-0301.1
URI: http://eprints.usq.edu.au/id/eprint/37169

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