Distinct circulation states of the Arctic atmosphere induced by natural climate variability
The high-resolution regional climate model HIRHAM4 with a horizontalresolution of 0.5 degrees times 0.5 degrees was used to determine theinfluence of natural climate variations in the Arctic. The large-scalelateral forcing and the lower boundary forcing for the HIRHAM4 weredelivered from a long-term...
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ftawi:oai:epic.awi.de:659 2023-09-05T13:15:53+02:00 Distinct circulation states of the Arctic atmosphere induced by natural climate variability Dorn, Wolfgang Dethloff, Klaus Rinke, Annette Botzet, M. 2000 https://epic.awi.de/id/eprint/659/ http://dx.doi.org/2000JD900546 https://hdl.handle.net/10013/epic.11243 unknown Dorn, W. orcid:0000-0002-2071-9472 , Dethloff, K. , Rinke, A. orcid:0000-0002-6685-9219 and Botzet, M. (2000) Distinct circulation states of the Arctic atmosphere induced by natural climate variability , Journal of Geophysical Research - Atmospheres, Vol. 105, No. D24, pp. 29659-29668 . doi:2000JD900546 , hdl:10013/epic.11243 EPIC3Journal of Geophysical Research - Atmospheres, Vol. 105, No. D24, pp. 29659-29668, ISSN: 0148-0227 Article isiRev 2000 ftawi 2023-08-22T19:42:05Z The high-resolution regional climate model HIRHAM4 with a horizontalresolution of 0.5 degrees times 0.5 degrees was used to determine theinfluence of natural climate variations in the Arctic. The large-scalelateral forcing and the lower boundary forcing for the HIRHAM4 weredelivered from a long-term run of the coupled circulation model ECHO-Gat T30 resolution. This run was carried out with prescribed constantexternal forcing for present-day climate conditions. 600 years of thisECHO-G simulation were analyzed to find periods persisting over severalyears either with mainly warm or mainly cold conditions during the Arcticwinter. Two warm and two cold periods, each of 6 years duration, wereselected for the regionalization of the Arctic climate in January. Theperformed model simulations show that a warm or cold Arctic winterclimate is connected with two distinct circulation states of the Arcticatmosphere. These states are characterized by a different location andextension of the tropospheric vortex with a vortex center over thewestern Arctic in warm Januaries or over the eastern Arctic in coldJanuaries, respectively. Moreover, there are indications that thesedifferent locations of the vortex are linked to a different synopticactivity in Alaska and the eastern part of the Arctic which is, in turn,related to a different meridional transport of heat and moisture intothese regions. The resultant climate conditions in these regions differfrom each other with statistical significance and are, finally, decisivefor the warm or cold Arctic climate state. Article in Journal/Newspaper Arctic Arctic Alaska Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The high-resolution regional climate model HIRHAM4 with a horizontalresolution of 0.5 degrees times 0.5 degrees was used to determine theinfluence of natural climate variations in the Arctic. The large-scalelateral forcing and the lower boundary forcing for the HIRHAM4 weredelivered from a long-term run of the coupled circulation model ECHO-Gat T30 resolution. This run was carried out with prescribed constantexternal forcing for present-day climate conditions. 600 years of thisECHO-G simulation were analyzed to find periods persisting over severalyears either with mainly warm or mainly cold conditions during the Arcticwinter. Two warm and two cold periods, each of 6 years duration, wereselected for the regionalization of the Arctic climate in January. Theperformed model simulations show that a warm or cold Arctic winterclimate is connected with two distinct circulation states of the Arcticatmosphere. These states are characterized by a different location andextension of the tropospheric vortex with a vortex center over thewestern Arctic in warm Januaries or over the eastern Arctic in coldJanuaries, respectively. Moreover, there are indications that thesedifferent locations of the vortex are linked to a different synopticactivity in Alaska and the eastern part of the Arctic which is, in turn,related to a different meridional transport of heat and moisture intothese regions. The resultant climate conditions in these regions differfrom each other with statistical significance and are, finally, decisivefor the warm or cold Arctic climate state. |
format |
Article in Journal/Newspaper |
author |
Dorn, Wolfgang Dethloff, Klaus Rinke, Annette Botzet, M. |
spellingShingle |
Dorn, Wolfgang Dethloff, Klaus Rinke, Annette Botzet, M. Distinct circulation states of the Arctic atmosphere induced by natural climate variability |
author_facet |
Dorn, Wolfgang Dethloff, Klaus Rinke, Annette Botzet, M. |
author_sort |
Dorn, Wolfgang |
title |
Distinct circulation states of the Arctic atmosphere induced by natural climate variability |
title_short |
Distinct circulation states of the Arctic atmosphere induced by natural climate variability |
title_full |
Distinct circulation states of the Arctic atmosphere induced by natural climate variability |
title_fullStr |
Distinct circulation states of the Arctic atmosphere induced by natural climate variability |
title_full_unstemmed |
Distinct circulation states of the Arctic atmosphere induced by natural climate variability |
title_sort |
distinct circulation states of the arctic atmosphere induced by natural climate variability |
publishDate |
2000 |
url |
https://epic.awi.de/id/eprint/659/ http://dx.doi.org/2000JD900546 https://hdl.handle.net/10013/epic.11243 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Alaska |
genre_facet |
Arctic Arctic Alaska |
op_source |
EPIC3Journal of Geophysical Research - Atmospheres, Vol. 105, No. D24, pp. 29659-29668, ISSN: 0148-0227 |
op_relation |
Dorn, W. orcid:0000-0002-2071-9472 , Dethloff, K. , Rinke, A. orcid:0000-0002-6685-9219 and Botzet, M. (2000) Distinct circulation states of the Arctic atmosphere induced by natural climate variability , Journal of Geophysical Research - Atmospheres, Vol. 105, No. D24, pp. 29659-29668 . doi:2000JD900546 , hdl:10013/epic.11243 |
_version_ |
1776197695749226496 |