Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers

Dalaiden, Quentin; Abram, Nerilie J.; Goosse, Hugues; Holland, Paul R. ORCID: https://orcid.org/0000-0001-8370-289X; O'Connor, Gemma K.; Topál, Dániel. 2024 Multi-Decadal Variability of Amundsen Sea Low Controlled by Natural Tropical and Anthropogenic Drivers. Geophysical Research Letters, 51 (16), e2024GL109137. 13, pp. https://doi.org/10.1029/2024GL109137

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.102...

Abstract/Summary

A crucial factor influencing the mass balance of the West Antarctic Ice Sheet is the Amundsen Sea Low (ASL), a climatological low-pressure region situated off the West Antarctic coast. However, albeit the deepening of the ASL since the 1950s has been attributed to anthropogenic forcing, the multi-decadal variability of the ASL remains poorly understood, because of a lack of long observations. Here, we apply a newly developed data assimilation method to reconstruct the ASL over 1870–2000. We study the forced and internal variability of the ASL using our new reconstruction in concert with existing large ensembles of climate model simulations. Our findings robustly demonstrate that an atmospheric teleconnection originating from the tropical Indo-Pacific is the main driver of ASL variability at the multi-decadal time scale, with resemblance to the Interdecadal Pacific Oscillation. Since the mid-20th century, anthropogenic forcing has emerged as a dominant contributor to the strengthening of the ASL.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2024GL109137
ISSN:	0094-8276
Date made live:	19 Aug 2024 10:12 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537878

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2024GL109137

ISSN:

0094-8276

Date made live:

19 Aug 2024 10:12 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/537878