Improvement of the Global Precipitation Climatology Project in High Latitudes Using the Latest Satellite and Surface Observations
Abstract
The Global Precipitation Climatology Project (GPCP) is a widely-used community-based analysis of global precipitation under the auspices of the World Climate Research Program (WCRP) and the Global Energy and Water Exchanges (GEWEX) project. GPCP is a combined satellite-gauge product. Satellite data are used over land and ocean and obtained from the Special Sensor Microwave Imager (SSMI), Special Sensor Microwave Imager/Sounder (SSMIS), geostationary imagers and polar orbiting infrared sounders. GPCP uses the Global Precipitation Climatology Centre (GPCC) full product over land, as its in situ component, but prior to combination with satellite data, GPCC estimates are adjusted for gauge undercatch. Over the last few years advanced sensors from TRMM, CloudSat and GPM have provided valuable new insights and we have started to utilize them to update GPCP. This is especially the case over extra tropics and high latitudes, using CloudSat and GPM, and tropics using TRMM and GPM. Furthermore, we have used the Gravity Recovery and Climate Experiment (GRACE) to assess snowfall accumulations over frozen lands, adding valuable insights into what we already measured from sparse rain gauges together with correction factors needed to correct for gauge undercatch. There are few other recent resources that we are exploring in this project to update GPCP in light of recent advances in precipitation instruments and retrieval algorithms that we will also discuss in our presentation. We are planning to make a beta version of the updated GPCP available to community in few months.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.H22D..04B
- Keywords:
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- 3354 Precipitation;
- ATMOSPHERIC PROCESSES;
- 3360 Remote sensing;
- ATMOSPHERIC PROCESSES;
- 1655 Water cycles;
- GLOBAL CHANGE;
- 1840 Hydrometeorology;
- HYDROLOGY