Independent Variables (Grids)

Time (time)	grid: /T (julian_day) ordered (1 Jan 1981) to (31 Oct 2024) by 1.0 N= 16010 pts :grid
Longitude (longitude)	grid: /X (degree_east) periodic (179.975W) to (179.975E) by 0.05 N= 7200 pts :grid
Latitude (latitude)	grid: /Y (degree_north) ordered (49.975N) to (49.975S) by 0.05 N= 2000 pts :grid

Other Info

acknowledgements

The Climate Hazards Group InfraRed Precipitation with Stations development process was carried out through U.S. Geological Survey (USGS) cooperative agreement #G09AC000001 "Monitoring and Forecasting Climate, Water and Land Use for Food Production in the Developing World" with funding from: U.S. Agency for International Development Office of Food for Peace, award #AID-FFP-P-10-00002 for "Famine Early Warning Systems Network Support," the National Aeronautics and Space Administration Applied Sciences Program, Decisions award #NN10AN26I for "A Land Data Assimilation System for Famine Early Warning," SERVIR award #NNH12AU22I for "A Long Time-Series Indicator of Agricultural Drought for the Greater Horn of Africa," The National Oceanic and Atmospheric Administration award NA11OAR4310151 for "A Global Standardized Precipitation Index supporting the US Drought Portal and the Famine Early Warning System Network," and the USGS Land Change Science Program.

creator_email

pete@geog.ucsb.edu

creator_name

Pete Peterson

date_created

2015-02-20

documentation

http://pubs.usgs.gov/ds/832/

faq

http://chg-wiki.geog.ucsb.edu/wiki/CHIRPS_FAQ

ftp_url

ftp://ftp.chc.ucsb.edu/pub/org/chc/products/CHIRPS-2.0

institution

Climate Hazards Center. University of California at Santa Barbara

note

There is an improved temporal downscaling procedure for estimating the final daily CHIRPS. The previous daily data will be supported through the end of 2015. Since CHIRPS pentads and monthly remain unchanged there will be no change in the CHIRPS version number. This is not a new version of CHIRPS, it is an improvement on the temporal downscaling to daily estimates. The Problem: When temporally downscaling CHIRPS to daily maps, there are many locations with significant residuals. (Residual here is the difference between monthly CHIRPS and the sum of daily CHIRPS for that month) In fact for over 80 percent of the locations with residuals, the residual was 100 percent of the monthly CHIRPS. These are places where the daily CCD fails, often due to warm precipitation. The Solution: Add an extra step to distribute the monthly precipitation to across days in the month only for pixels where the monthly residual is > 1 mm. The first challenge was to decide the appropriate number of days of precipitation for a given month. We used the locations with zero residual to derive a relationship between total monthly CHIRPS and number of rain days. Now, using the total residual and number of rain days, we use the highest N values of daily CHIRP for the month to proportionally distribute the monthly total across those days.

reference

Funk, C.C., Peterson, P.J., Landsfeld, M.F., Pedreros, D.H., Verdin, J.P., Rowland, J.D., Romero, B.E., Husak, G.J., Michaelsen, J.C., and Verdin, A.P., 2014, A quasi-global precipitation time series for drought monitoring: U.S. Geological Survey Data Series 832, 4 p., http://dx.doi.org/110.3133/ds832.

title

CHIRPS Version 2.0

version

Version 2.0

website

https://www.chc.ucsb.edu/data/chirps/

history

created by Climate Hazards Center

References

Funk, C. C, Peterson, P. J., Landsfeld, M. F., Pedreros, D. H., Verdin, J. P., Rowland, J. D., Romero, B. E., Husak, G. J. Michaelsen, J. C., and Verdin, A. P., 2014, A quasi-global precipitation time series for drought monitoring: U. S. Geological Survey Data Series 832, 4 p., http://dx.doi.org/110.3133/ds832.

Last updated: Fri, 15 Nov 2024 23:28:12 GMT
Expires: Sun, 01 Dec 2024 00:00:00 GMT