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The Implementation Plan of the Arctic Climate
Systeme Study (ACSYS) requested for establishment
of an Arctic Precipitation Data Archive (APDA).
APDA has been established in 1996 within the
Global Precipitation Climatology Center (GPCC)
at the Deutscher Wetterdienst. APDA focuses on
the period 1950-2000 and contains both daily and
monthly as well as uncorrected and corrected
precipitation and snow depth data from all
observation stations (as far as available)
within the Arctic drainage basin.
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ACSYS APDA Location of Arctic SYNOP stations
in GPCCs data bank
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ACSYS APDA Sampling error of monthly
precipitation calculated for Canada and Finland
on 1 gridboxes using a Monte-Carlo technique.
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ACSYS APDA Decrease of the number GTS-SYNOP
stations being available in the Yenisey
hydrological catchment area after 1994
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Comparison of GPCCs gridded precipitation data
sets and GRDCs river discharge data (figure of
1999)
GPCCs analysis period startet with the year
1986, while GRDCs collection is mostly based on
earlier data deliveries. GPCC is going to
extend its data collection and analysis for the
20th century retrospectively.
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• APDA Research and Development Project Phase 2
• (April 2002 March 2005)
• The aims of this project (beginning in Sep 2002,
  funded by the German Polar Research Programme)
  are
• Updating of the archive of precipitation and
  snow depth by additional data from surface
  networks, satellite data and model results
  (ERA-40).
• Development of a method for using snow depth
  data for quality-control of precipitation data
  and complementation of precipitation analysis.
• Quality assessment based on statistical studies
  for the data being hold in the archive.
• Further development of the method for
  correction of precipitation data with regard to
  the systematic gauge measurement error.
• Verification of precipitation predicted by NWP
  re-analyses of ERA-40.
• Development of an improved large-scale
  precipitation climatology for the Arctic
  catchment area based on both precipitation and
  snow depth data.
• Continuation of the Archives service for
  ACSYS participants.