The Role of Katabatic Outflow in Maintaining the Upper Level Antarctic Winter Vortex
Entry ID: ASAC_692

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Summary
Abstract: 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.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 692


Link: VIEW RELATED INFORMATION
Description: Download point for the data - pdf abstract


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -50.0 S: -90.0  E: 180.0  W: -180.0

Temporal Coverage
Start Date: 1993-09-30
Stop Date: 1995-03-31


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR


Science Keywords
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS    [Definition]
ATMOSPHERE >ATMOSPHERIC WINDS >UPPER LEVEL WINDS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
GCM >General Circulation Model    [Information]


Quality
Values provided in temporal coverage are approximate only.


Access Constraints
A pdf copy of the referenced paper is available for download from the provided URL.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference at the provided URL when using these data.


Keywords
KATABATIC FLOW
UPPER LEVEL VORTEX


Data Set Progress
COMPLETE


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia



Distribution
Distribution_Media: HTTP
Distribution_Size: 252 kb
Distribution_Format: pdf
Fees: free


Personnel
IAN SIMMONDS
Role: INVESTIGATOR
Role: TECHNICAL CONTACT
Phone: +61 3 9344 7216
Fax: +61 3 9344 7761
Email: simmonds at unimelb.edu.au
Contact Address:
University of Melbourne
School of Earth Sciences
City: PARKVILLE
Province or State: Victoria
Postal Code: 3052
Country: Australia


DAVE J. CONNELL
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


Publications/References
Simmonds I., Law R. (1995) Do low-level winds over Antarctica play a role in maintaining the upper-level low? Abstracts Volume, Australian Meteorological and Oceanographic Society Conference, Lorne, Australia, 20-22 February, 1995 115

Creation and Review Dates
DIF Creation Date: 2000-07-28
Last DIF Revision Date: 2014-01-10

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