Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect
Abstract 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, B y , of the interplanetary magnetic field (IMF). We find the...
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crioppubl:10.1088/2515-7620/ab4a84 2024-09-15T17:45:31+00:00 Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect Freeman, Mervyn P Lam, Mai Mai British Antarctic Survey Philip Leverhulme Prize 2019 http://dx.doi.org/10.1088/2515-7620/ab4a84 https://iopscience.iop.org/article/10.1088/2515-7620/ab4a84 https://iopscience.iop.org/article/10.1088/2515-7620/ab4a84/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Communications volume 1, issue 11, page 111007 ISSN 2515-7620 journal-article 2019 crioppubl https://doi.org/10.1088/2515-7620/ab4a84 2024-08-05T04:18:55Z Abstract 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, B y , 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 B y 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 B y can be expected to persist. Since the tropospheric pressure anomalies causing these winds have been associated with B y -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. Article in Journal/Newspaper Antarc* Antarctic IOP Publishing Environmental Research Communications 1 11 111007 |
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Abstract 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, B y , 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 B y 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 B y can be expected to persist. Since the tropospheric pressure anomalies causing these winds have been associated with B y -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. |
author2 |
British Antarctic Survey Philip Leverhulme Prize |
format |
Article in Journal/Newspaper |
author |
Freeman, Mervyn P Lam, Mai Mai |
spellingShingle |
Freeman, Mervyn P Lam, Mai Mai Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect |
author_facet |
Freeman, Mervyn P Lam, Mai Mai |
author_sort |
Freeman, Mervyn P |
title |
Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect |
title_short |
Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect |
title_full |
Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect |
title_fullStr |
Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect |
title_full_unstemmed |
Regional, seasonal, and inter-annual variations of Antarctic and sub-Antarctic temperature anomalies related to the Mansurov effect |
title_sort |
regional, seasonal, and inter-annual variations of antarctic and sub-antarctic temperature anomalies related to the mansurov effect |
publisher |
IOP Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1088/2515-7620/ab4a84 https://iopscience.iop.org/article/10.1088/2515-7620/ab4a84 https://iopscience.iop.org/article/10.1088/2515-7620/ab4a84/pdf |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Environmental Research Communications volume 1, issue 11, page 111007 ISSN 2515-7620 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/2515-7620/ab4a84 |
container_title |
Environmental Research Communications |
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1 |
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11 |
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111007 |
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1810493385112289280 |