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Title
Title:
Precipitation - Millimeters
SubTitle:
National level
Filename:  
precipitation_mm
 
 
 
General Description
Abstract:
The CRU Global Climate Dataset available through the IPCC DDC consists of a multi-variate 0.5 latitude by 0.5 longitude resolution mean monthly climatology for global land areas, excluding Antarctica, strictly constrained to the period 1961-1990, together with monthly time series at the same resolution for the period 1901-1995. The mean 1961-1990 climatology comprises a suite of eleven surface variables: precipitation (PRE) and wet-day frequency (WET); mean, maximum and minimum temperature (TMP, TMX, TMN); diurnal temperature range (DTR); vapour pressure (VAP;) global radiation (RAD;) cloud cover (CLD); frost frequency (FRS); and wind speed (WND). The mean climate surfaces have been constructed from a new dataset of station 1961-1990 climatological normals, numbering between 19,800 (precipitation) and 3615 (windspeed). The station data were interpolated as a function of latitude, longitude and elevation using thin-plate splines. The accuracy of the interpolations are assessed using cross-validation and by comparison with other climatologies. this data-set has been decsribed in: New,M., Hulme,M. and Jones,P.D. (1999) Representing twentieth century space-time climate variability. Part 1: development of a 1961-90 mean monthly terrestrial climatology J.Climate 12, 829-856. To calculate monthly time series, grids of monthly anomalies relative to 1961-90 were calculated for each variable and applied to their respective 1961-90 climatology. The anomaly approach was adopted because the network of station normals was much more comprehensive than the network of station time series. The spatial variability in mean climate was best captured by the denser network of station normals, while the more sparse network of primary variable time series captured as much temporal variability as possible. This dataset has been described in: New M.G., Hulme M., and Jones P.D. 2000 representing twentieth-century space-time climate variability. Part II: Development of 1901-1996 monthly grids of terrestrial surface climate. J. Climate 13: 2217-2238. More information: http://ipcc-ddc.cru.uea.ac.uk/cru_data/cru_index.html
Purpose:
Undertaking a climate change impacts assessment not only requires climate and non-climatic scenarios for the future, but also good quality observed data describing present-day climate. Often the observed climate datasets required may be extensive (e.g. global coverage) or comprehensive (e.g. many climate variables). Data may be required as monthly means, as monthly time series, or as daily time series and the length of record would ideally be at least 30 years, perhaps longer.
Units:
Millimeters per Year
GEO Theme:
Atmosphere
GEO Data Category:   
Climate
Type:
Data downloads
Subtype:
-----
Language:
English
Status:
Complete
Maintenance:
Unknown
 
 
 
Keywords
GEMET Theme:
Climate
Free Keywords:
Climate, Atmosphere, Rain, Precipitation, millimeters, national level
 
 
 
Online Reference
URL:
http://ipcc-ddc.cru.uea.ac.uk/cru_data/examine/ddc_climate.html
File Format:
Web page
 
 
 
Spatial Reference
Coverage:
World
Coordinates:
 
North
90
 
West -180
 
180 East
 
-90
South
 
Region:
World
Subregion:
-----
Resolution:
Country
 
 
 
Temporal Reference
Covered Time:
1961-90
 
 
 
Responsability
Person:
Dr. Mike Hulme
Organization:
IPCC - Intergovernmental Panel on Climate Change
Address:
Climatic Research Unit University of East Anglia
 
 
Postal Code:
NR4 7TJ
City:
Norwich
State:
-----
Country:
United Kingdom
Phone:
+44 1603 593162
Fax:
+44 1603 507784
Email:
m.hulme@uea.ac.uk
 
 
Publisher:
IPCC
Publ. Place:
Norwich
 
 
Publ. Year:
2001
Data Source:
IPCC
Data Provider:
IPCC-DCC
Copyright:
IPCC-DCC
User Constr.:
Public
 
 
 
Metadata Information
Person:
Gregory Giuliani
Organization:
UNEP/DEWA/GRID-Geneva
Address:
11, Chemin des Anemones
 
 
Postal Code:
1219
City:
Chatelaine
State:
Geneva
Country:
Switzerland
Phone:
+41 22 917 82 94
Fax:
+41 22 917 80 29
Email:
geo@grid.unep.ch
 
 
Date:
20020321
 
 
 
 
 
GIS Data Info
Projection:
-----
 
 
Min. Scale:
-----
Max. Scale
-----
Data Resol.:
-----
Data Format:
-----
 
 
 
Statistics Data Info
Aggregation method
Mehtod:
Weighted average
Weight factor:
Total Area
Comments:
The value "-9999" corresponds to "No Data"
 
Interpolations/Extrapolations
Interpolations:
None
Extrapolations:
None
Method:
Other
Comments:
-----
 
Calculated pre 1991-1992 relative country share
Former USSR:
None
Former Yugoslavia SFR:
None
Former Czechoslovakia:
None
Former Ethiopia:
None
Comments:
-----
 
General comments
Country notes:
The Global totals do not include values for Antarctica.
Definitions:
Precipitation is the annual average (within 1961-90) of water falling on the country.
Comments:
The original data took the form of a value for each month and each box on a 0.5 degree latitude / longitude grid. The seasonal and annual values are the means of their constituent months. Original Data Station observations were first collected by national meteorological, hydrological and related services, and were acquired through the free and unrestricted exchange of meteorological and related data. These observations were gridded by collaborators at the Climatic Research Unit (www.cru.uea.ac.uk). The gridded data-set is publicly available, and has been published in a peer- reviewed scientific journal: New, M., Hulme, M., and Jones, P., 1999: Representing twentieth-century space-time climate variability. Part I: Development of a 1961-1990 mean monthly terrestrial climatology. Journal of Climate 12: 829-856. New, M.G., Hulme,M., and Jones,P.D., 2000: Representing twentieth-century space-time climate variability. Part II: Development of 1901-1996 monthly grids of terrestrial surface climate. Journal of Climate 13:2217-2238.).