Climatic Research Unit : Data : Pressure & Circulation Indices

Trans Polar Index (TPI)

The TPI is defined as the normalized pressure difference between Hobart and Stanley. The index was first suggested by Pittock (1980,1984) and has been updated and analysed further by Jones et al. (1999).

Jones, P.D., Salinger, M.J. and Mullan, A.B., 1999: Extratropical circulation indices in the Southern Hemisphere based on station data. International Journal of Climatology 19, 1301-1317
Pittock, A.B., 1980: Patterns of climatic variation in Argentina and Chile, I: Precipitation, 1931-60, Monthly Weather Review, 108, 1347-1361
Pittock, A.B., 1984: On the reality, stability and usefulness of Southern Hemisphere teleconnections, Australian Meteorological Magazine, 32, 75-82

File format (TPI)

for year = 1895 to endyear format(i5,12f7.2,f8.2) year, 12 * monthly value, annual value
Missing values represented by -9.99

File format (TPI)
for year = 1895 to endyear format(i5,12f7.2,f8.2) year, 12 * monthly value, annual value
Missing values represented by -9.99

File format (Station pressure)

format(i3,i5,i5,a) ?, ?, endyear, sitename for year = 1895 to endyear format(i4,1x,12i6) year, 12 * monthly value

Missing values represented by -10
Divide by 10 for millibars

File format (Station pressure)
format(i3,i5,i5,a) ?, ?, endyear, sitename for year = 1895 to endyear format(i4,1x,12i6) year, 12 * monthly value
Missing values represented by -10 Divide by 10 for millibars

Filename Size Description

tpi.dat 10 kilobytes TPI

tpi_hob.dat 8 kilobytes Pressure data for Hobart, Australia

tpi_stan.dat 8 kilobytes Pressure data for Stanley, Falklands

You can download these files from here (right-click then select "Save Target As" or "Save Link As")

Filename	Size	Description
tpi.dat	10 kilobytes	TPI
tpi_hob.dat	8 kilobytes	Pressure data for Hobart, Australia
tpi_stan.dat	8 kilobytes	Pressure data for Stanley, Falklands
You can download these files from here (right-click then select "Save Target As" or "Save Link As")

Last updated: November 2006, Mike Salmon

These datasets are made available under the Open Database License.

Any rights in individual contents of the datasets are licensed under the
Database Contents License under the conditions of Attribution and Share-Alike.

Please use the attribution Climatic Research Unit, University of East Anglia