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Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
Menne_pairwise.briefing.COST_part2.ppt
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Menne_pairwise.briefing.COST_part2.ppt

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  • 1. GHCN-Daily
    • Global Daily Data Set derived from multiple sources (10+)
    • ~20,000 temperature stations (Tmax and Tmin)
    • ~43,000 precipitation stations (Precip)
    • Currently > 1 450 000 000 daily observations (Tmax, Tmin, Prcp, Snowfall/Snowdepth)
  • 2. Temperature Stations
  • 3. Precipitation Stations
  • 4. Updates
    • All sources are “refreshed” daily or weekly
    • Dataset is reassembled each week from original source data
    • QC checks are applied to full period of record
  • 5.  
  • 6.  
  • 7. GCOS Surface Network Data
    • GSN Archive available from: ftp:// ftp.ncdc.noaa.gov/pub/data/ghcn/daily/gsn
    • The GSN Archive is also integrated from a number of sources via the GHCN-Daily processing system
      • QC’d as part of GHCN Daily
      • Updated daily using GTS synoptic data and country specific sources
      • Still to be done:
      • Add “un-quarantined” data from RA I-Africa
  • 8.  
  • 9. Flag Rates
    • No check has a false-positive rate of more than 20% (most <10%)—false positive rate for overall system 10% or less
    • Total flag rate equal to 0.06% for all temperature values and 0.15% for all precipitation values
  • 10. Undocumented Changepoint Example Version 1 Version 2 Pine River Dam Maximum Temperature Series minus Regional Average
  • 11. USHCN V.1 Temperature series near Milan, MN
  • 12. USHCN V.2 Temperature series near Milan, MN
  • 13. All Coop Series surrounding Waynesville, NC
  • 14. All Coop Series surrounding Waynesville, NC
  • 15. Summary of shifts in HCN mean monthly maximum and minimum temperature series. A negative shift indicates that the inhomogeneity led to a decrease in the mean level of the temperature series relative to preceding values.
  • 16. Summary of shifts in HCN mean monthly maximum and minimum temperature series. A negative shift indicates that the inhomogeneity led to a decrease in the mean level of the temperature series relative to preceding values.
  • 17. The Time of Observation Bias
  • 18. The Time of Observation Bias 1950s 1960s 1980s 2000- 2006 1970s 1990s
    • Since the 1950s, observation times have shifted from afternoon/ evening to morning
    Hour of observation histograms at bottom of each U.S. decadal map (Figure courtesy of Xioamoa Lin, University of Nebraska)
  • 19. Impact of Time of Observation Changes Average year by year difference over the conterminous United States between the Time of Observation Bias (TOB)-adjusted data and the unadjusted (raw) data.
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