The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex
The data set associated with this project is a long simulation from a global climate model, with data saved every 6 hours. Also part of the simulated atmospheric data in the project is the results of sensitivity studies which were designed to assess the impact of changes in Antarctic katabatic flow....
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ftands:oai:ands.org.au::700272 2023-05-15T13:46:58+02:00 The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex SIMMONDS, IAN (hasPrincipalInvestigator) SIMMONDS, IAN (processor) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-50.0; southlimit=-90.0; westlimit=-180.0; eastLimit=180.0; projection=WGS84 Temporal: From 1993-09-30 to 1995-03-31 https://researchdata.ands.org.au/role-katabatic-outflow-winter-vortex/700272 https://data.aad.gov.au/metadata/records/ASAC_692 http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.ands.org.au/role-katabatic-outflow-winter-vortex/700272 d5bab61b-142d-4417-8ddc-43849dd7532c ASAC_692 https://data.aad.gov.au/metadata/records/ASAC_692 http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre climatologyMeteorologyAtmosphere SURFACE WINDS EARTH SCIENCE ATMOSPHERE ATMOSPHERIC WINDS UPPER LEVEL WINDS KATABATIC FLOW UPPER LEVEL VORTEX GCM > General Circulation Model CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:17:19Z The data set associated with this project is a long simulation from a global climate model, with data saved every 6 hours. Also part of the simulated atmospheric data in the project is the results of sensitivity studies which were designed to assess the impact of changes in Antarctic katabatic flow. Among these are simulated data with enhanced surface friction, and with the removal of Antarctic topography. From the abstract of the referenced paper: The results of some published studies have been interpreted to suggest that transports associated with the intense katabatic flow field over the Antarctic continent are important factors influencing the development of the upper level winter vortex over the continent. Some of these studies have been rather simplistic and their results may have been taken out of context. We have undertaken some experiments with a model which includes the effects of many feedbacks and synoptic forcing. In this model we have artificially weakened the katabatic flow and assessed the impact on the upper-level vortex. We have effected this weakening by: 1) 'removing' the Antarctic topography, and 2) increasing the surface momentum drag coefficient over Antarctica. We find a weakened upper-level vortex circulation in the no-topography experiment but a strengthened vortex in the increased drag experiment. The difference in response can be traced to the nature of the reaction of the tropospheric thermal field. Our results indicate that there is no simple, unambiguous relationship between the strength of the katabatic flow and the depth of the upper-level vortex. Dataset Antarc* Antarctic Antarctica Research Data Australia (Australian National Data Service - ANDS) Antarctic The Antarctic ENVELOPE(-180.0,180.0,-50.0,-90.0) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
climatologyMeteorologyAtmosphere SURFACE WINDS EARTH SCIENCE ATMOSPHERE ATMOSPHERIC WINDS UPPER LEVEL WINDS KATABATIC FLOW UPPER LEVEL VORTEX GCM > General Circulation Model CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
spellingShingle |
climatologyMeteorologyAtmosphere SURFACE WINDS EARTH SCIENCE ATMOSPHERE ATMOSPHERIC WINDS UPPER LEVEL WINDS KATABATIC FLOW UPPER LEVEL VORTEX GCM > General Circulation Model CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex |
topic_facet |
climatologyMeteorologyAtmosphere SURFACE WINDS EARTH SCIENCE ATMOSPHERE ATMOSPHERIC WINDS UPPER LEVEL WINDS KATABATIC FLOW UPPER LEVEL VORTEX GCM > General Circulation Model CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR |
description |
The data set associated with this project is a long simulation from a global climate model, with data saved every 6 hours. Also part of the simulated atmospheric data in the project is the results of sensitivity studies which were designed to assess the impact of changes in Antarctic katabatic flow. Among these are simulated data with enhanced surface friction, and with the removal of Antarctic topography. From the abstract of the referenced paper: The results of some published studies have been interpreted to suggest that transports associated with the intense katabatic flow field over the Antarctic continent are important factors influencing the development of the upper level winter vortex over the continent. Some of these studies have been rather simplistic and their results may have been taken out of context. We have undertaken some experiments with a model which includes the effects of many feedbacks and synoptic forcing. In this model we have artificially weakened the katabatic flow and assessed the impact on the upper-level vortex. We have effected this weakening by: 1) 'removing' the Antarctic topography, and 2) increasing the surface momentum drag coefficient over Antarctica. We find a weakened upper-level vortex circulation in the no-topography experiment but a strengthened vortex in the increased drag experiment. The difference in response can be traced to the nature of the reaction of the tropospheric thermal field. Our results indicate that there is no simple, unambiguous relationship between the strength of the katabatic flow and the depth of the upper-level vortex. |
author2 |
SIMMONDS, IAN (hasPrincipalInvestigator) SIMMONDS, IAN (processor) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex |
title_short |
The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex |
title_full |
The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex |
title_fullStr |
The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex |
title_full_unstemmed |
The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex |
title_sort |
role of katabatic outflow in maintaining the upper level antarctic winter vortex |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.ands.org.au/role-katabatic-outflow-winter-vortex/700272 https://data.aad.gov.au/metadata/records/ASAC_692 http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-50.0; southlimit=-90.0; westlimit=-180.0; eastLimit=180.0; projection=WGS84 Temporal: From 1993-09-30 to 1995-03-31 |
long_lat |
ENVELOPE(-180.0,180.0,-50.0,-90.0) |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.ands.org.au/role-katabatic-outflow-winter-vortex/700272 d5bab61b-142d-4417-8ddc-43849dd7532c ASAC_692 https://data.aad.gov.au/metadata/records/ASAC_692 http://nla.gov.au/nla.party-617536 |
_version_ |
1766245908132921344 |