ESRL/PSD Seminar Series
The Transition in Atmospheric Boundary Layer Turbulence Structure from Neutral to Moderately Convective Stability States
NOAA Climate Prediction Center
CMORPH global high-resolution satellite precipitation estimates have
been reprocessed and bias-corrected for a 15-year period from
January 1998 to the present to cover the entire TRMM/GPM era. As the
first step of this project, the CMORPH estimates have been extended
backward in time from the December 2002 operational initiation to
January 1998 and reprocessed from 2003 to the present using the most
recent passive microwave (PMW) retrieval algorithm version from all
available low earth orbiters and infrared (IR) observations from
Bias correction is then performed for the raw CMORPH over the entire
data period from 1998 to the present. Over land, the bias in the raw
CMORPH is removed by matching the probability density function (PDF)
of the CMORPH with that of the CPC unified daily gauge analysis in
two sequential steps. Over ocean, the raw CMORPH satellite estimates
are calibrated against a long-term precipitation analysis (pentad
GPCP) to ensure temporal homogeneity for climate applications. The
reprocessed, bias-corrected CMORPH estimates present a 15-year
homogeneous record of high-resolution precipitation on an 8kmx8km
and 30-min resolution covering the globe from 60oS-60oN.
Bias corrected CMORPH is applied to examine the large-scale
precipitation variations over the globe. In particular, diurnal
variations of precipitation is investigated and compared with that
captured by the three new generation reanalyses (CFSR, MERRA, and
ERA-Interim). While the reanalyses tend to over-estimate the total
precipitation, the magnitude of the diurnal cycle is smaller than
that in the bias-corrected CMORPH over most of the global regions.
Detailed results will be illustrated at the seminar.
At the end of the seminar, new developments in the area of creating
a regional CMORPH with refined resolution and reduced latency
through enhancement from GOES-R and constructing high-resolution
precipitation analyses through fusion with gauge measurements, radar
estimates and numerical model forecasts will be introduced to
discussions with our colleagues in Boulder.
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extra minutes for this procedure. If you are a foreign national
coming from outside the NOAA campus, please email the seminar coordinator at least 48 hours prior to the seminar to provide information required for security purposes.