Climate

Map of mean annual and monthly precipitation amount's standard deviation. December .

Download GIS-layers

Authors:

A.N. Afonin, K.L. Lipiyaynen, V.Y. Tsepelev
The layer of mean annual and monthly precipitation amount's standard deviation is the Kriging in accordance with the data on mean average precipitation values from the nodes of the regular grid which were elaborated at NOAA NCEP, USA by Dr. Aiguo Dai

Compilation date:

May 2005.

Scale:

10 km/pix

Map's precision:

The map contains averaged values of mean annual and monthly precipitation amount's standard deviation for fragments of the Earth's surface with the area of 10 x 10 km.

Projection:

Albers equal-area projection for the USSR
ref. system : Alber's Equal Area Conic for Russia
projection : Alber's Equal Area Conic
datum : Pulkovo 1942 (S42)
delta WGS84 : 28 -130 -95
ellipsoid : Krasovsky
major s-ax : 6378245.000
minor s-ax : 6356863.019
origin long : 100
origin lat : 0
origin X : 0
origin Y : 0
scale fac : na
units : m
parameters : 2
stand ln 1 : 44
stand ln 2 : 68

Main content:

A bitmapped map. The map contains mean annual precipitation amount's standard deviation

Classifier's precision:

The precision of mean annual and monthly precipitation amount's standard deviation is to a tenth of a unit of measurement.

Map's compilation procedure:

Mean annual and monthly precipitation amount's standard deviation in the nodes of the regular grid with a spacing of 1 degree has been calculated on the basis of the information from the database of mean monthly precipitation values for the period from 1961 to 1990. The values of mean annual precipitation in this database are distributed among the nodes of the regular grid with the spacing of 2.5 degrees. Therefore the values of the mean annual and monthly precipitation amount's standard deviation were initially calculated for the nodes of the regular grid with the spacing of 2.5 degrees and afterwards they were interpolated by way of optimal interpolation into the regular grid with the spacing of 1 degree. The database of mean annual precipitation values has been found in the database created at NOAA NCEP by Dr. Aiguo Dai. This database contains verified data from basic stations of NOAA NCEP for the period from 1850 to 1995. This information was obtained via the Internet from the FTP-server ftp.ncep.noaa.gov/pub/precip/cmap/monthly

Data sources:

Dai, A., I.Y. Fung and A.D. Del Genio 1997. Surface observed global land precipitation variations during 1900-1988. J. Climate 10, 2943-2962.
Escheid et al. 1991. A comprehensive precipitation data set for the global land areas. DOE Technical Report No. TR051, DOE ER-69017T-H1, 81 pages.
Shea, D.J. 1986. Climatological Atlas: 1950-1979. NCAR TN-269+STR. National Center for Atmospheric Research, Boulder, CO.