Contributions to Polar Amplification in CMIP5 and CMIP6 Models

Hahn, L. C.; Armour, K. C.; Zelinka, M. D.; Bitz, C. M.; Donohoe, A.

doi:10.3389/feart.2021.710036

Title: Contributions to Polar Amplification in CMIP5 and CMIP6 Models

Journal Article · Fri Aug 20 00:00:00 EDT 2021 · Frontiers in Earth Science

DOI:https://doi.org/10.3389/feart.2021.710036· OSTI ID:1814671

Hahn, L. C. ^[1]; Armour, K. C. ^[2]; Zelinka, M. D. ^[3]; Bitz, C. M. ^[1]; Donohoe, A. ^[4]

Univ. of Washington, Seattle, WA (United States). Dept. of Atmospheric Sciences
Univ. of Washington, Seattle, WA (United States). Dept. of Atmospheric Sciences; Univ. of Washington, Seattle, WA (United States). School of Oceanography
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Washington, Seattle, WA (United States). Polar Science Center, Applied Physics Lab.

As a step towards understanding the fundamental drivers of polar climate change, we evaluate contributions to polar warming and its seasonal and hemispheric asymmetries in Coupled Model Intercomparison Project phase 6 (CMIP6) as compared with CMIP5. CMIP6 models broadly capture the observed pattern of surface- and winter-dominated Arctic warming that has outpaced both tropical and Antarctic warming in recent decades. For both CMIP5 and CMIP6, CO₂ quadrupling experiments reveal that the lapse-rate and surface albedo feedbacks contribute most to stronger warming in the Arctic than the tropics or Antarctic. The relative strength of the polar surface albedo feedback in comparison to the lapse-rate feedback is sensitive to the choice of radiative kernel, and the albedo feedback contributes most to intermodel spread in polar warming at both poles. By separately calculating moist and dry atmospheric heat transport, we show that increased poleward moisture transport is another important driver of Arctic amplification and the largest contributor to projected Antarctic warming. Seasonal ocean heat storage and winter-amplified temperature feedbacks contribute most to the winter peak in warming in the Arctic and a weaker winter peak in the Antarctic. In comparison with CMIP5, stronger polar warming in CMIP6 results from a larger surface albedo feedback at both poles, combined with less-negative cloud feedbacks in the Arctic and increased poleward moisture transport in the Antarctic. However, normalizing by the global-mean surface warming yields a similar degree of Arctic amplification and only slightly increased Antarctic amplification in CMIP6 compared to CMIP5.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1814671

Report Number(s):: LLNL-JRNL-822049; 1034255

Journal Information:: Frontiers in Earth Science, Vol. 9, Issue N/A; ISSN 2296-6463

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
54 ENVIRONMENTAL SCIENCES
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Title: Contributions to Polar Amplification in CMIP5 and CMIP6 Models

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