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ISLSCP II Global Precipitation Climatology Project Version 2, Monthly Precipitation
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Revision date: March 1, 2011

Summary:

The Global Precipitation Climatology Project (GPCP) Version 2 data set includes global, monthly precipitation rates and associated random errors (RMSE), and a monthly precipitation climatology derived as an average from all GPCP data  from January 1979 to December 1999. The data are derived from measured gauge data and merged with satellite estimates of rainfall. This is a portion of the version 2 GPCP data and covers the ISLSCP II period from 1986 to 1995. There are six data files included with this data set:  the original precipitation rates, errors and climatology at 2.5 degrees spatial resolution, and the same data  re-gridded to a 1.0 degree spatial resolution by the ISLSCP II staff.

Additional Documentation:

This data set is one of the products of the International Satellite Land-Surface Climatology Project, Initiative II (ISLSCP II) data collection which contains 50 global time series data sets for the ten-year period 1986 to 1995. A complete description of the data, it's derivation, acknowledgements, and references provided by the ISLSCP II Data Management Staff is included with this data set as a companion file named 1_gpcp_precip_monthly_doc.pdf.

ISLSCP II is a consistent collection of data sets that were compiled from existing data sources and algorithms, and were designed to satisfy the needs of modelers and investigators of the global carbon, water and energy cycle. The data were acquired from a number of U.S. and international agencies, universities, and institutions. The data and documentation have undergone two peer reviews.

ISLSCP is one of several projects of Global Energy and Water Cycle Experiment (GEWEX) [http://www.gewex.org/] and has the lead role in addressing land-atmosphere interactions -- process modeling, data retrieval algorithms, field experiment design and execution, and the development of global data sets.

 

Data Citation:

Cite this data set as follows:

Huffman, G., D. Bolvin, and R. Adler. 2011. ISLSCP II Global Precipitation Climatology Project Version 2, Monthly Precipitation. In Hall, Forrest G., G. Collatz, B. Meeson, S. Los, E. Brown de Colstoun, and D. Landis (eds.). ISLSCP Initiative II Collection.  Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/1003

File Information:

The archived data sets for ISLSCP II have been organized by categories. This data set is in the Hydrology, Soils, and Topography category -- a collection of hydroclimatology and surface elevation data sets

Data Set Spatial Extent: Global gridded

Westernmost Longitude: -180 W

Easternmost Longitude: 180 E

Northernmost Latitude: 90 N

Southernmost Latitude: -90 S

Projection: Geographic

Data Set Spatial Resolution: 1.0 degree  and 2.5 degrees in both latitude and longitude

Data Set Temporal Extent: 1979 through 1999

Data File Format

All of the data files in each data set within the ISLSCP Initiative II data collection are in ASCII GRID format. The file format consists of numerical fields of varying length, which are delimited by a single space and arranged in columns and rows. There are 6 data files (.zip) with this data set,  3 file with the original 2.5 degree spatial resolution and 3 files regridded to a 1.0 degree spatial resolution:

gpcp_clim_1deg_1979-99.zip:  When expanded, this file contains 12 files named  gpcp_clim_1d_1979-99MM.asc with the original GPCP 1979 to 1999 precipitation monthly climatology (mm/day) at a 1.0 degree resolution. Here 1979-99 implies that this is an average for the particular month for the period 1979 to 1999. MM is the month from 01 to 12.

gpcp_esg_1deg.zip: When expanded, this file contains 120 files named  gpsp_esg_1d_YYYYMM00.asc with the original GPCP precipitation error estimates (mm/day) at a 1.0 degree resolution. Here YYYY is the year from 1986 to 1995 , MM is the month from 01 to 12, and 00 means that it is a monthly average;  esg stands for Error Satellite Guage. 

gpcp_psg_1deg.zip: When expanded, this file contains 120 files named gpcp_psg_1d_YYYYMM00.asc with the original GPCP precipitation error estimates (mm/day) at a 1.0 degree resolution. Here YYYY is the year from 1986 to 1995 , MM is the month from 01 to 12, and 00 means that it is a monthly average;  psg stands for Precipitation Satellite Guage. 

gpcp_clim_orig_1979-99.zip: When expanded, this file contains 12 files named gpcp_clim_orig_1979-99MM.asc with the original GPCP 1979 to 1999 precipitation monthly climatology (mm/day) at a 2.5 degree resolution. Here 1979-99 implies that this is an average for the particular month for the period 1979 to 1999. MM is the month from 01 to 12.

gpcp_esg_orig.zip: When expanded, this file contains 120 files named gpsp_esg_orig__YYYYMM00.asc with the original GPCP precipitation error estimates (mm/day) at a 2.5 degree resolution. Here YYYY is the year from 1986 to 1995 , MM is the month from 01 to 12, and 00 means that it is a monthly average;  esg stands for Error Satellite Guage. 

gpcp_psg_orig.zip: When expanded, this file contains 120 files named gpsp_psg_orig_YYYYMM00.asc with the original GPCP precipitation error estimates (mm/day) at a 2.5 degree resolution. Here YYYY is the year from 1986 to 1995 , MM is the month from 01 to 12, and 00 means that it is a monthly average;  psg stands for Precipitation Satellite Guage. 

 

Data file naming conventions are further described in the 1_gpcp_precip_monthly_doc.pdf  and  0__gpcp_precip_monthly_readme.txt

References: 

Adler, R.F., G.J. Huffman, A. Chang, R. Ferraro, P. Xie, J. Janowiak, B. Rudolf, U. Schneider, S. Curtis, D. Bolvin, A. Gruber, J. Susskind, P. Arkin, E.J. Nelkin, (2003): The version 2 Global Precipitation Climatology Project (GPCP) Monthly Precipitation Analysis (1979-Present). J Hydrometeor., 4(6), 1147-1167.

Data Access:

These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC) [http://daac.ornl.gov].

Data Archive Contact Information:

E-mail: uso@daac.ornl.gov
Telephone: +1 (865) 241-3952