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The variability of the Southern Annular Mode and associations with high latitude weather and climate

Entry ID: ASAC_2540

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Summary

Abstract: Metadata record for data from ASAC Project 2540
See the link below for public details on this project.

The hemispheric and regional atmospheric circulation influences the Southern Ocean in many and profound ways, including intense air-sea fluxes of momentum, energy, fresh water and dissolved gases. The Southern Ocean ventilates a large fraction of the world ocean and hence these influences are ... spread globally. We use the NCEP-2 reanalysis dataset to diagnose aspects of the large-scale atmospheric structure and variability and explore how these impact on the Southern Ocean. We discuss how the 'Southern Annular Mode' and the 'Pacific-South American' pattern influence the Southern Ocean, particularly in the Eastern Pacific. We review the importance of atmospheric eddies in Southern Ocean climate, and the role they play in transport of mechanical energy into the ocean. The fluxes of fresh water across the air-sea boundary influence strongly the processes of water mass formation. It is shown that climatological precipitation exceeds evaporation over most of the Southern Ocean. When averaged over the ocean from 50S to the Antarctic coast the annual mean excess is 0.8 mm per day. The magnitude of the flux displays only a small measure of seasonality, and it's largest value of 0.92 mm per day occurs in summer.

In this project, the NCEP reanalysis datasets were sourced from: NOAA/National Weather Service, National Centers for Environmental Prediction (5200 Auth Road, Camp Springs, Maryland, 20746 USA).

Two NCEP reanalysis data sets were used in this study. The first was NCEP/NCAR, with 6-hourly data available from 1958 (see the URL provided below for further information). The second was the NCEP/DOE set, with 6-hourly data available from 1979 (see the URL provided below for further information).

The ERA-40 is a 're-analysis' of meteorological observations from September 1957 to August 2002 produced by the European Centre for Medium-Range Weather Forecasts (ECMWF) in collaboration with many institutions.

The HadISST1.1 data set was the first version of the global sea-ice and sea surface temperature dataset produced by the Hadley Centre at the United Kingdom Meteorological Office.

In this project the following model/analysis was applied:

Application of The University of Melbourne cyclone tracking scheme (Simmonds et al., 2003, Monthly Weather Review, 131, 272-288) and a broad range of statistical tests. Brief details are provided in the Summary. See the link for the pdf document for more detailed information.

These complex statistical analyses were run over the entire length of the project (2004/05 - 2006/07). They were run on Dell PCs in the School of Earth Sciences, The University of Melbourne.

Related URL

Link: GET DATA

Description: Download point for the data - pdf document detailing the model used

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: 58.0

S: 51.0

E: 101.0

W: 40.0

Data Set Citation

Dataset Originator/Creator: A. Robock, K. Vinnikov, C.A. Schlosser, N.A. Speranskaya

Dataset Title: RUSWET-GRASS-6STA-FORCING: Forcing and Validation Data from 6 Russian Stations

Dataset Series Name: RUSWET-GRASS-6STA-FORCING: Forcing and Validation Data from 6 Russian Stations

Dataset Release Date: 1999

Dataset Release Place: NJ

Dataset Publisher: Dept. of Environmental Sciences, Rutgers University

Online Resource: http://climate.envsci.rutgers.edu/soil_moisture/ruswet.forcing.6sta...

Parent DIF

This data set description is a member of a collection. The collection is described in
GLOBAL_SM_DATABANK_RUSWET6STA

Temporal Coverage

Start Date: 1978-01-01

Stop Date: 1983-12-31

Location Keywords

CONTINENT > EUROPE > EASTERN EUROPE > RUSSIA

GEOGRAPHIC REGION > EURASIA

Science Keywords

AGRICULTURE > SOILS > SOIL MOISTURE/WATER CONTENT

ATMOSPHERE > ATMOSPHERIC PRESSURE > ATMOSPHERIC PRESSURE MEASUREMENTS

ISO Topic Category

FARMING

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

GEOSCIENTIFIC INFORMATION

INLAND WATERS

Platform

GROUND-BASED OBSERVATIONS

Ancillary Keywords

ACTINOMETRIC DATA

DEW POINT TEMPERATURE

Data Set Progress

COMPLETE

Originating Center

RU/GSMDB

Data Center

Global Soil Moisture Data Bank, Department of Environmental Science, Cook College, Rutgers University

Data Center URL: http://climate.envsci.rutgers.edu/soil_moisture/index.html
Dataset ID: Global_Soil_Moisture_Data_Bank

Data Center Personnel
Name: ALAN ROBOCK Phone: 732-932-9800 x6222 Fax: 732-932-8644 Email: robock at envsci.rutgers.edu Contact Address: Department of Environmental Sciences Rutgers University 14 College Farm Road City: New Brunswick Province or State: New Jersey Postal Code: 08901-8551 Country: USA

Distribution

Distribution Media: ftp

Distribution Format: ASCII

Fees: Free

Personnel

ALAN ROBOCK

Role: INVESTIGATOR

Phone: 732-932-9800 x6222

Fax: 732-932-8644

Email: robock at envsci.rutgers.edu

Contact Address:

Department of Environmental Sciences

Rutgers University

14 College Farm Road

City: New Brunswick

Province or State: New Jersey

Postal Code: 08901-8551

Country: USA

Publications/References

Robock, Alan, Konstantin Ya. Vinnikov, C. Adam Schlosser, Nina
A. Speranskaya, and Yongkang Xue, 1995: Use of midlatitude soil
moisture and meteorological observations to validate soil moisture
simulations with biosphere and bucket models. J. Climate, 8,
15-35. Abstract available from
http://climate.envsci.rutgers.edu/robock/robock_pub9.html

Vinnikov, K. Ya. and I. B. Yeserkepova, 1991: Soil moisture: empirical
data and model results. J. Climate, 4, 66-79.

Creation and Review Dates

Last DIF Revision Date: 2008-01-22

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