HadRT: Hadley Centre Radiosonde Temperature dataset
This product has been replaced by our
new radiosonde temperature data set HadAT.
These pages are provided for the benefit of existing and past users of HadRT.
New and existing users are now encouraged to use HadAT instead.
Please note that it is a term of usage of this dataset that it
is used in conjunction with our HadAT dataset
Brief description of the data
The Met Office Hadley Centre's mean radiosonde temperature
dataset, HadRT, is a data set of monthly fields of radiosonde
temperature anomalies at standard pressure levels on a 5 degree latitude
by 10 degree longitude grid from 1958 to present.The HadRT data sets consist of monthly or
seasonal temperature anomalies. Anomalies are calculated
with respect to 1971-1990 climatology. Anomalies are available for 9
standard levels (850, 700, 500, 300, 200, 150, 100, 50, 30hPa) as well
as tropospheric (850 - 300hPa) and stratospheric (150 -
30hPa) averages. In some versions bias corrections linked to
instrumental or operational discontinuities have been applied to data,
by weighting in the vertical to simulate Microwave Sounding Unit (MSU)
retrievals MSU2 - troposphere and MSU4 - stratosphere.
Radiosonde observations are taken
from the Met Office archive of monthly CLIMAT TEMP reports received in
near-real time. The currently available versions of
- HADRT2.0: Unadjusted data
- HADRT2.1: As HadRT2.0 but with bias corrections made to many station
time series world-wide. The adjustments were calculated by reference to
MSU data products, but only for known changes in instrumental or
operational procedures for the period post 1979. No data are available
for the 30hPa level in this version.
- HADRT2.1s: This is a combination of HadRT2.0 in the troposphere (up to
and including 200hPa) and HadRT2.1 in the stratosphere (above 200hPa).
- HADRT2.2: This is an eigenvector reconstructed grid data set from 1958
- 2000, on a 10 degree latitude by 20 degree longitude grid, created
from HadRT2.1. The eigenvector reconstruction was used to
infill missing seasons or years in boxes with 70% of seasonal or annual
- HADRT2.2u: As HadRT2.2, but created from HadRT2.0.
- HADRT2.3: This is a globally complete dataset based on HadRT2.1
1958-2000, but with gaps filled in by reference to the second
derivative of the corresponding NCEP reanalysis temperature fields,
using the Laplacian technique of R.W. Reynolds 1988: 'A real-time
Global Sea Surface Temperature Analysis',J.Climate, 1, 75-86
- HADRT2.3s: As HadRT2.3 but using HadRT2.1s.
Commercial and media enquiries
You can access the Met Office Customer Centre, any time of the day or night by phone, fax or e-mail. Trained staff will help you find the information or products that are right for you.
Contact the Met Office Customer Centre
When using the data set in a paper, the following is the correct citation to use:
D.E.Parker, Gordon, M., Cullum, D.P.N., Sexton, D.M.H., Folland,
C.K., and Rayner, N. 1997: 'A New Gridded Radiosonde Temperature Data
Base and Recent Temperature Trends'. Geophys. Res. Letters, 24, 1499-1503
Dataset produced in collaboration with: