NOAA/NCDC Global Gridded Temperature Anomalies, 1880-presentEntry ID: NOAA_NCDC_GHCN_ANOM
Abstract: These data sets contain gridded temperature anomalies for three parameters
(mean, minimum, and maximum temperatures) from the GHCN V2 monthly temperature
data sets. GHCN homogeneity adjusted data was the primary source for developing
the gridded fields. In grid boxes without homogeneity adjusted data, GHCN raw
data was used to provide additional coverage when possible. Each ... month of data
consists of 2592 gridded data points produced on a 5 X 5 degree basis for the
entire globe (72 longitude X 36 latitude grid boxes).
Gridded data for every month from January 1880 to the most recent month is
available. The data are temperature anomalies in degrees Celcius.
These datasets were created from station data using the Anomaly Method, a
method that uses station averages during a specified base period (1961-1990 in
this case) from which the monthly/seasonal/annual departures can be calculated.
Prior to March 25, 2005 the First Difference Method (Peterson et al. 1998) was
used in producing the Mean Temperature grid, and prior to February 24, 2004,
the FD Method was used in producing the Maximum and Minimum Temperature grids.
Due to recent efforts to restructure the GHCN station data by removing
duplicates (see Peterson et al. 1997 for a discussion of duplicates), it became
possible to develop grids for all temperature data sets using the Anomaly
Method. The Anomaly Method can be considered to be superior to the FD Method
when calculating gridbox size averages. The FD Method has been found to
introduce random errors that increase with the number of time gaps in the data
and with decreasing number of stations (Free et al. 2004). While the FD Method
works well for large-scale means, these issues become serious on 5X5 degree
Anomalies were calculated on a monthly basis for all adjusted stations having
at least 25 years of data in the 1961-1990 base period. Station anomalies were
then averaged within each 5 X 5 degree grid box to obtain the gridded
anomalies. For those grid boxes without adjusted data, anomalies were
calculated from the raw station data using the same technique.
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Data Set Citation
Dataset Originator/Creator: NOAA/NCDC
Dataset Title: Global Gridded Temperature Products
Dataset Series Name: Global Historical Climatology Network (GHCN)
Dataset Release Place: Asheville, NC
Dataset Publisher: NOAA/NCDCOnline Resource: http://www.ncdc.noaa.gov/oa/climate/research/ghcn/ghcngrid.html
Start Date: 1880-01-01
Latitude Resolution: 5 degrees
Longitude Resolution: 5 degrees
Horizontal Resolution Range: 500 km - < 1000 km or approximately 5 degrees - < 10 degrees
Temporal Resolution: monthly
Temporal Resolution Range: Monthly - < Annual
ISO Topic Category
Data Set Progress
Distribution Media: online www
Distribution Format: ascii
Role: TECHNICAL CONTACT
Email: jay.lawrimore at noaa.gov
Climate Monitoring Branch National Climatic Data Center
Province or State: NC
Postal Code: 28801-5001
Free, M., J.K. Angell, I. Durre, J. Lanzante, T.C. Peterson and D.J. Seidel,
2004: Using first differences to reduce inhomogeneity in radiosonde temperature
datasets, J. Climate, 21, 4171-4179.
Peterson, Thomas C. and Russell S. Vose, 1997: An overview of the Global
Historical Climatology Network temperature data base, Bulletin of the American
Meteorological Society, 78, 2837-2849.
Peterson, T.C., T.R. Karl, P.F. Jamason, R. Knight, and D.R. Easterling, 1998:
The first difference method: maximizing station density for the calculation of
long-term global temperature change. Journal of Geophysical Research,
Atmospheres, 103 (D20), 25967-25974.
Creation and Review Dates
DIF Creation Date: 2005-12-21
Last DIF Revision Date: 2011-07-21