Data

Southern Oscillation Index

Australian Antarctic Data Centre
CLIMATE SERVICES ; REGIONAL OBSERVATIONS SECTION
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://data.aad.gov.au/metadata/records/SOE_southern_oscillation_index&rft.title=Southern Oscillation Index&rft.identifier=https://data.aad.gov.au/metadata/records/SOE_southern_oscillation_index&rft.publisher=Australian Antarctic Data Centre&rft.description=INDICATOR DEFINITION The Southern Oscillation Index (SOI) is calculated from the monthly or seasonal fluctuations in the air pressure difference between Tahiti and Darwin. TYPE OF INDICATOR There are three types of indicators used in this report: 1.Describes the CONDITION of important elements of a system; 2.Show the extent of the major PRESSURES exerted on a system; 3.Determine RESPONSES to either condition or changes in the condition of a system. This indicator is one of: CONDITION DESIGN AND STRATEGY FOR INDICATOR MONITORING PROGRAM Note: this indicator is mirrored from the Bureau of Meterologys SOI page at http://www.bom.gov.au/climate/current/soihtm1.shtml Spatial scale: Southern hemisphere Frequency: Monthly reporting Measurement technique: There are a few different methods of how to calculate the SOI. The method used by the Australian Bureau of Meteorology is the Troup SOI which is the standardised anomaly of the Mean Sea Level Pressure difference between Tahiti and Darwin. It is calculated as follows: SOI = 10*(Pdiff - Pdiffav) / SD(Pdiff) where Pdiff = (average Tahiti MSLP for the month) - (average Darwin MSLP for the month), Pdiffav = long term average of Pdiff for the month in question, and SD(Pdiff) = long term standard deviation of Pdiff for the month in question. The multiplication by 10 is a convention. Using this convention, the SOI ranges from about ?35 to about +35, and the value of the SOI can be quoted as a whole number. The SOI is usually computed on a monthly basis, with values over longer periods such a year being sometimes used. Daily or weekly values of the SOI do not convey much in the way of useful information about the current state of the climate, and accordingly the Bureau of Meteorology does not issue them. Daily values in particular can fluctuate markedly because of daily weather patterns, and should not be used for climate purposes. RESEARCH ISSUES This dataset has obvious implications for climate change research.&rft.creator=CLIMATE SERVICES &rft.creator=REGIONAL OBSERVATIONS SECTION &rft.date=2005&rft.coverage=northlimit=90; southlimit=-90; westlimit=-180; eastLimit=180; projection=WGS84&rft.coverage=northlimit=90; southlimit=-90; westlimit=-180; eastLimit=180; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SOE_southern_oscillation_index when using these data.&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=ATMOSPHERIC PRESSURE MEASUREMENTS&rft_subject=EARTH SCIENCE&rft_subject=ATMOSPHERE&rft_subject=ATMOSPHERIC PRESSURE&rft_subject=EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > TELECONNECTIONS > EL NINO SOUTHERN OSCILLATION (ENSO)&rft_subject=EL NINO&rft_subject=AIR PRESSURE&rft_subject=SOI&rft_subject=SOUTHERN OSCILLATION INDEX&rft_subject=AWS > Automated Weather System&rft_subject=FIXED OBSERVATION STATIONS&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > GLOBAL&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data

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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SOE_southern_oscillation_index when using these data.

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Brief description

INDICATOR DEFINITION
The Southern Oscillation Index (SOI) is calculated from the monthly or seasonal fluctuations in the air pressure difference between Tahiti and Darwin.

TYPE OF INDICATOR
There are three types of indicators used in this report:
1.Describes the CONDITION of important elements of a system;
2.Show the extent of the major PRESSURES exerted on a system;
3.Determine RESPONSES to either condition or changes in the condition of a system.

This indicator is one of: CONDITION

DESIGN AND STRATEGY FOR INDICATOR MONITORING PROGRAM
Note: this indicator is mirrored from the Bureau of Meterologys SOI page at http://www.bom.gov.au/climate/current/soihtm1.shtml

Spatial scale: Southern hemisphere

Frequency: Monthly reporting

Measurement technique: There are a few different methods of how to calculate the SOI. The method used by the Australian Bureau of Meteorology is the Troup SOI which is the standardised anomaly of the Mean Sea Level Pressure difference between Tahiti and Darwin. It is calculated as follows:

SOI = 10*(Pdiff - Pdiffav) / SD(Pdiff)

where

Pdiff = (average Tahiti MSLP for the month) - (average Darwin MSLP for the month),

Pdiffav = long term average of Pdiff for the month in question, and

SD(Pdiff) = long term standard deviation of Pdiff for the month in question.

The multiplication by 10 is a convention. Using this convention, the SOI ranges from about ?35 to about +35, and the value of the SOI can be quoted as a whole number. The SOI is usually computed on a monthly basis, with values over longer periods such a year being sometimes used. Daily or weekly values of the SOI do not convey much in the way of useful information about the current state of the climate, and accordingly the Bureau of Meteorology does not issue them. Daily values in particular can fluctuate markedly because of daily weather patterns, and should not be used for climate purposes.

RESEARCH ISSUES
This dataset has obvious implications for climate change research.

Issued: 2005-07-07

Data time period: 1876-01-01

This dataset is part of a larger collection

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