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Variability and stability of Antarctic Bottom Water

Entry ID: ASAC_2535

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Summary

Abstract: Metadata record for data from ASAC Project 2535
See the link below for public details on this project.

Project 2535

'Variability and stability of Antarctic Bottom Water (AABW)'

Metadata description

(1) Model analysis of natural AABW variability:-

We have assessed the interannual to multi-decadal variability of AABW in a global ... coupled climate model, focussing on variations in bottom water formation rates, T-S changes on AABW neutral surfaces, and the physical mechanisms controlling this variability.

The global coupled climate model used is the CSIRO Mark 3 Coupled Climate Model, which incorporates sub-models of the ocean, atmosphere, sea-ice, and land-surface. The experiments were run over a global grid at approximate resolution of 1.9 degrees x 1.9 degrees x 18 levels in the atmosphere, and 1.875 degrees x 0.94 degrees x 31 levels in the ocean. Variables analysed include oceanic temperature, salinity and circulation on AABW density layers, sea-ice extent and thickness, atmospheric sealevel pressure, temperature, and winds. The model integration considered was run with steady CO2 levels for two hundred years in a quasi-steady state mode. Full details of the CSIRO Mark 3 Coupled Climate Model can be found in Gordon et al. (2002).

Gordon, H.B., Rotstayn, L.D., McGregor J.L., Dix M.R., Kowalczyk E.A., O'Farrell S.P., 2002: The CSIRO Mk3 Climate System Model. CSIRO Division of Atmospheric Research Technical Paper, No. 60. 130pp.

(2) Model simulations of CO2-induced change in AABW:

We also ran simulations of climate change within the Canadian University of Victoria Earth System Climate Model of Intermediate Complexity at a global longitude x latitude resolution of 3.6 degrees x 1.8 degrees. The model includes a primitive equation three-dimensional, 19 level ocean model, a sea-ice model, a simple land and river model and a two dimensional energy-moisture balance atmospheric model. A number of sensitivity experiments on ocean mixing parameters and the sea-ice model were conducted to ptimise the Southern Hemisphere climatology for the control experiment. The control case (CTRL) was integrated for 3100 years starting from idealised initial conditions. Three climate change experiments were conducted, in which atmospheric carbon dioxide concentrations are changed to 450 ppm, 750 ppm and 1000 ppm from a pre-industrial level of 280 ppm, over different temporal regimes. Full model experiment descriptions appear in Bates, Sijp, and England (2005).

Bates, M.L., W.P. Sijp, and M.H. England, 2005: On the multi-century Southern Hemisphere response to changes in atmospheric CO2 concentration in a coupled climate model. Meteor. Atmos. Phys., in press.

Related URL

Link: VIEW PROJECT HOME PAGE

Description: Public information for ASAC project 2535

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -50.0

S: -70.0

E: 180.0

W: -180.0

Temporal Coverage

Start Date: 2004-10-07

Location Keywords

OCEAN > SOUTHERN OCEAN

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > OCEAN CIRCULATION > WATER MASSES

ISO Topic Category

OCEANS

Quality The Date provided in temporal coverage is approximate only.

Access Constraints This project was a modelling projet, and as such did not collect any actual data. Model details are provided in the summary.

See the link for the pdf document for further information.

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 provided at the URL below when using these data.

Ancillary Keywords

Bottom water

CSIRO

Model

Climate

Data Set Progress

IN WORK

Originating Center

Data Center

Australian Antarctic Data Centre, Australia

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 Format: pdf

Fees: free

Personnel

MATTHEW ENGLAND

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Role: INVESTIGATOR

Phone: +61 2 9385 7065

Email: M.England at unsw.edu.au

Contact Address:

CENTRE FOR ENVIRONMENTAL MODELLING

AND PREDICTION, SCHOOL OF MATHEMATICS

THE UNIVERSITY OF NSW

Province or State: New South Wales

Country: Australia

Publications/References

Gordon, H.B., Rotstayn, L.D., McGregor J.L., Dix M.R., Kowalczyk E.A., O'Farrell S.P., 2002: The CSIRO Mk3 Climate System Model. CSIRO Division of Atmospheric Research Technical Paper, No. 60. 130pp

Bates, M.L., W.P. Sijp, and M.H. England, 2005: On the multi-century Southern Hemisphere response to changes in atmospheric CO2 concentration in a coupled climate model. Meteor. Atmos. Phys., in press.

Creation and Review Dates

DIF Creation Date: 2005-03-02

Last DIF Revision Date: 2009-04-20

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