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Experiments are conducted to examine the sensitivity of the base period length in defining the mean and extreme precipitation climatology

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Progress Report from the Global Satellite – Derived Products Provider at NOAA/NWS Climate Prediction Center

Pingping Xie

NOAA Climate Prediction Center

As a global satellite-derived products provider, we generate a suite of satellite-based products at NOAA Climate Prediction Center (CPC) for the WMO SEMDP program.

These include a) gauge-based, satellite-derived, and gauge-satellite blended analyses of precipitation; b) satellite-derived outgoing longwave radiation (OLR); c) geostationary satellite infrared (IR) blackbody temperature (TBB) data array; d) satellite-derived soil moisture fields and vegetation products from NESDIS/STAR. In addition to the real- time updates of the above mentioned fields, climatology for both the mean and extremes are constructed for a 20-year period from 1998 to 2017 to facilitate the monitoring of weather and climate extremes from a historical context.

At the core of these products is the CPC Morphing technique (CMORPH) precipitation estimates (Xie et al. 2017) which are produced through integrating information from multiple passive microwave (PMW) and infrared (IR) channel measurements aboard multiple geostationary (GEO) and low earth orbit (LEO) platforms. Examinations of the CMORPH satellite precipitation estimates showed good performance of the product in detecting and quantifying precipitation and its variations especially during warm seasons and over tropics and sub-tropics.

Experiments are conducted to examine the sensitivity of the base period length in defining the mean and extreme precipitation climatology. In general, precipitation anomaly, percentage of normal and the Standardized Precipitation Index (SPI) computed using climatology derived for a short base period (20/30 years) show quite good

quantitative agreements with those with a climatology of longer period (70 years).

Cautions, however, are needed in detecting and quantifying rare extremes (both heavy rainfall events and droughts) with the climatology for shorter periods.

Over the past year, we have established a set of procedures to generate weekly and monthly summaries of the most important geophysical fields for easy utilization in field applications.

All satellite-derived products described above are available through ftp at https://ftp.cpc.ncep.noaa.gov/precip/PORT/SEMDP.

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