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Met Office Hadley Centre Global Gridded Mean Sea Level Pressure (HadSLP1) data (1871-1998)

Update Frequency: Not Planned
Latest Data Update: 2004-12-02
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2007-02-03
Download Stats: last 12 months
Dataset Size: 3 Files | 59MB


The Met Office Hadley Centre produced the HadSLP1 dataset which replaces the Global Mean Sea Level Pressure (GMSLP) data sets, and is a unique combination of monthly globally-complete fields of land and sea pressure observations a 5 degree latitude-longitude grid from 1871 to 1998.

The advantages of HadSLP1 over GMSLP2 are an improved land station data base, new interpolation scheme and the incorporation of local detail while safeguarding against random errors. Like GMSLP2, HadSLP1 was developed by Tracy Basnett and David Parker, in collaboration with R.J. Allan (previously at CSIRO and now at the Met Office) and M.J. Salinger (NIWA).

Marine observations were taken from the Met Office Marine Data Bank (MDB) and from the NOAA Comprehensive Ocean-Atmosphere Data Set (COADS) (Woodruff et al, 1987). The MDB data were given priority in the blend, which is described in Basnett and Parker (1997). Land observations are a combination of data obtained from CSIRO (Australia), NIWA (New Zealand), CRU (University of East Anglia), GHCN, and operationally-received "CLIMAT" messages. The latter were used mainly for updating station series and for the Arctic.

HadSLP1 pressures are reconstructed using a reduced-space optimal interpolation procedure, followed by superposition of quality-improved gridded observations onto the reconstructions to restore local detail.

Citable as:  Basnett, T.; Parker, D.E.; Allan, R.J.; Sallinger, M.J. (2007): Met Office Hadley Centre Global Gridded Mean Sea Level Pressure (HadSLP1) data (1871-1998). NCAS British Atmospheric Data Centre, date of citation.
Abbreviation: Hadley-HadSLP1
Keywords: Met Office, Hadley, MSLP, HadSLP, GMSLP


Previous Info:
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Access rules:
Restricted data: please submit an application using the REQUEST ACCESS link for access.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data files from 1871 to 1998 acquired from the Hadley Centre directly, as is, and stored at the BADC.

Data Quality:
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Process overview

This dataset was generated by the computation detailed below.

HadSLP1 data processing deployed on Met Office Hadley Centre Computers


This computation involved: HadSLP1 data processing deployed on Met Office Hadley Centre Computers. Data processing used to produce the HadSLP1 dataset.

Input Description


Output Description


Software Reference


  • long_name: Mean Sea Level Pressure
  • names: Mean Sea Level Pressure
  • long_name: Sea Level Pressure
  • gcmd_url:
  • gcmd_keyword: Sea Level Pressure
  • names: Sea Level Pressure,

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