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139522 - Recent hemispheric asymmetry in global ocean warming induced by climate change.pdf (1.92 MB)

Recent hemispheric asymmetry in global ocean warming induced by climate change and internal variability

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posted on 2023-05-20, 15:20 authored by Saurabh RathoreSaurabh Rathore, Nathaniel BindoffNathaniel Bindoff, Helen PhillipsHelen Phillips, Feng, M
Recent research shows that 90% of the net global ocean heat gain during 2005–2015 was confined to the southern hemisphere with little corresponding heat gain in the northern hemisphere ocean. We propose that this heating pattern of the ocean is driven by anthropogenic climate change and an asymmetric climate variation between the two hemispheres. This asymmetric variation is found in the pre-industrial control simulations from 11 climate models. While both layers (0–700 m and 700–2000 m) experience steady anthropogenic warming, the 0–700 m layer experiences large internal variability, which primarily drives the observed hemispheric asymmetry of global ocean heat gain in 0–2000 m layer. We infer that the rate of global ocean warming is consistent with the climate simulations for this period. However, the observed hemispheric asymmetry in heat gain can be explained by the Earth’s internal climate variability without invoking alternate hypotheses, such as asymmetric aerosol loading.

History

Publication title

Nature Communications

Volume

11

Article number

2008

Number

2008

Pagination

1-8

ISSN

2041-1723

Department/School

Institute for Marine and Antarctic Studies

Publisher

Nature Publishing Group

Place of publication

United Kingdom

Rights statement

© The Author(s) 2020. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

Repository Status

  • Open

Socio-economic Objectives

Climate variability (excl. social impacts)

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