Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect

Freeman, Mervyn ORCID: https://orcid.org/0000-0002-8653-8279; Lam, Mai Mai. 2019 Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect. Environmental Research Communications, 11 (1), 111007. 10.1088/2515-7620/ab4a84

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Text (Open Access) © 2019 The Author(s). Published by IOP Publishing Ltd. Original content from thiswork may be used under the terms of the Creative Commons Attribution 3.0 icence. Any further distribution of this work must maintain attribution to theauthor(s)and the title ofthe work, journal citation and DOI. Freeman_2019_Environ._Res._Commun._1_111007.pdf - Published Version Available under License Creative Commons Attribution. Download (1MB) | Preview

Abstract/Summary

We use National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data to show that Antarctic surface air temperature anomalies result from differences in the daily-mean duskward component, By, of the interplanetary magnetic field (IMF). We find the statistically-significant anomalies have strong geographical, seasonal, and inter-annual variations. For the interval 1999-2002, regional anomalies poleward of 60°S are of diminishing representative peak amplitude from autumn (3.2°C) to winter (2.4°C) to spring (1.6°C) to summer (0.9°C). Exploiting apparently simplifying properties in the sub-Antarctic region in autumn 1999-2002, we demonstrate that temperature anomalies in this case are due to geostrophic wind anomalies, resulting from the same By changes, moving air across large meridional gradients in zonal mean air temperature between 50 and 70°S over the 7-hour timescale for which a change in By can be expected to persist. Since the tropospheric pressure anomalies causing these winds have been associated with By-driven anomalies in the electric potential of the ionosphere, we conclude that IMF-induced changes to the global atmospheric electric circuit can cause day-to-day changes in regional surface air temperature of up to several degrees Centigrade.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1088/2515-7620/ab4a84
Additional Keywords:	Interplanetary magnetic field, surface air temperature, Antarctic, global electric circuit
Date made live:	25 Oct 2019 09:26 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/525285

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