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).

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

Filename SizeDescription
tpi.dat 10 kilobytesTPI
tpi_hob.dat 8 kilobytesPressure data for Hobart, Australia
tpi_stan.dat 8 kilobytesPressure 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