Surface pressure data from the ISPD v4.7 was used as input to the 20CRv3 Reanalysis Project. The count of all available data is mapped here.

The plots have summed all the counts for a year in every 2 degree latitude/longitude box and divided by 365 to get an average counts per day with a maximum of 24 per day shown on the map.

The NetCDF file is 2x2 degree bins centered on the lat/lon given in the file. All observation data can be found in the ISPDv47 HDF5 files at NCAR.

Plot shows available observations per year for 20CRv3 assimilation

Maps of Observations used in 20CR through time (monthly).

FTP Link to netCDF data file of observation counts.

Maps of ISPD station locations through time.

ISPD Documentation

If you have data available for a year, please contact Gil Compo.

The International Surface Pressure Databank is a collaboration of the Atmospheric Circulation Reconstructions over the Earth initiative, the Global Climate Observing System (GCOS) Working Group on Surface Pressure, and the GCOS/World Climate Research Programme Working Group on Observational Data Sets for Reanalysis, and their partners. The ISPD station component shown here was merged by NOAA's National Centers for Environmental Information.

Citations:

• Cram, T.A., G. P. Compo, X. Yin, R. J. Allan, C. McColl, R. S. Vose, J.S. Whitaker, N. Matsui, L. Ashcroft, R. Auchmann, P. Bessemoulin, T. Brandsma, P. Brohan, M. Brunet, J. Comeaux, R. Crouthamel, B. E. Gleason, Jr., P. Y. Groisman, H. Hersbach, P. D. Jones, T. Jonsson, S. Jourdain, G. Kelly, K. R. Knapp, A. Kruger, H. Kubota, G. Lentini, A. Lorrey, N. Lott, S. J. Lubker, J. Luterbacher, G. J. Marshall, M. Maugeri, C. J. Mock, H. Y. Mok, O. Nordli, M. J. Rodwell, T. F. Ross, D. Schuster, L. Srnec, M. A. Valente, Z. Vizi, X. L. Wang, N. Westcott, J. S. Woollen, S. J. Worley, 2015: The International Surface Pressure Databank version 2. Geoscience Data J., 2, 31-46. doi:10.1002/gdj3.25.
• Compo, G. P., Slivinski, L. C., Whitaker, J. S., Sardeshmukh, P. D., McColl, C., Brohan, P., Allan, R., Yin, X., Vose, R., Spencer, L. J., Ashcroft, L., Bronnimann, S., Brunet, M., Camuffo, D., Cornes, R., Cram, T. A., Crouthamel, R., Dominguez-Castro, F., Freeman, J. E., Gergis, J., Giese, B. S., Hawkins, E., Jones, P. D., Jourdain, S., Kaplan, A., Kennedy, J., Kubota, H., Blancq, F. L., Lee, T., Lorrey, A., Luterbacher, J., Maugeri, M., Mock, C. J., Moore, K., Przybylak, R., Pudmenzky, C., Reason, C., Slonosky, V. C., Tinz, B., Titchner, H., Trewin, B., Valente, M. A., Wang, X. L., Wilkinson, C., Wood, K., and Wyszynski, P. (2019): The International Surface Pressure Databank version 4. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. http://rda.ucar.edu/datasets/ds132.2/.