NUMBER 83
DATE: 07/06/90
Sector Processing Center (SPC):
During May, NOA, JMA and ESA processed greater than 98% of A data into B1/B2 data.
Normal operations were reported by NOA, JMA and ESA. No report was received from AES.
CSU delivered the first INSAT B2 data covering the first three months of 86.
Special Area Processing Center (SAPC):
No reports were received.
Satellite Calibration Center (SCC):
New BC data were received for GMS-3 for July 89. Extra BC data near the transitions between METEOSAT-3
and METEOSAT-4 are being processed. Minor problems with AES AC data have occurred and are being
investigated.
Global Processing Center (GPC):
The GPC continued to receive B2 data and correlative data in a routine manner.
Production of NOAA-11 (preliminary) B3 data is current.
Production of (preliminary) B3 data for METEOSAT is current.
Production of NOAA-10 (preliminary) B3 data is current. Re-calibration of NOAA-10 B3 has been completed from December 86 through April 87.
Production of GOES-6 (preliminary) B3 data is completed. Re-calibration of GOES-6 B3 data will commence later this month.
Production of GOES-7 (preliminary) B3 data has started.
The replacement GMS-3 B2 data for six months in 87 and 88 have been received from JMA. Production of B3 data for GMS-4 is on hold awaiting information about the nominal calibration.
We have received the first delivery of INSAT-1 data from CSU, covering the first three months of 86; these data are acquired only twice daily. The GPC was also contacted by a Canadian company under contract to the Indian Meteorology Department to produce data processing software for INSAT-2 (scheduled to be launched later next year). Included in the processing software will be routine production of ISCCP data products. Further discussion of details is underway.
Production of TOVS correlative data is current. Delivery to the ICA of TOVS data for 1989 was made.
C1 data for April and May 86 have been completed. Production of C1 data for June and July 86 is underway.
Test C2 data production has commenced. In addition to averaging the C1 data over each diurnal phase and
then combining these averages to obtain the monthly mean statistics, several small corrections are made.
First, the overlapping results from each geostationary satellite and the afternoon polar orbiter are used to
remove small residual biases related to calibration differences. These corrections are typically of order 1-2%
for VIS-channel-dependent quantities and 1-2 K for IR-channel-dependent quantities. Second, we calculate
the average difference between daytime results produced with and without visible channel information and
apply this difference to nighttime data to reduce the day-night bias associated with the lack of visible data at
night. Third, we calculate zonal average diurnal variations to correct for undersampling of the diurnal cycle
in those areas covered only by the polar orbiters. Deliveries of C2 data should commence by the end of this
month.
ISCCP Central Archive (ICA):
The ICA continued to receive B1 data from NOA, AES, ESA, and JMA and B3 and C data from the GPC in
a routine manner.
The health of GMS-4, METEOSAT-3, METEOSAT-4, GOES-7, NOAA-10 and NOAA-11 remained good.
METEOSAT-4 is now the operational satellite. Solution of the propulsion problem for NOAA-D may delay
launch until after May 91. Estimated delivery dates for GOES-I instruments indicates a launch date no earlier
than summer 91.
Delivering backlog of NOAA-10 B2 data for October 89 through May 90 to the GPC.
Completing BC data for 1989.
Delivering all B3 data for 1987 and 1988 to the ICA.
Delivering snow and sea ice data for 1989 to the GPC.
Completing C1 data for 1986.
Delivering C2 data for 1983, 1984 and 1985.