Pressure Data in the International COADS (iCOADS) Scott Woodruff (NOAA/CDC) AOPC/SLP WG meeting Norwich, UK 20-21 November 2002 1)iCOADS 2.0  COADS background.

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Presentation transcript:

Pressure Data in the International COADS (iCOADS) Scott Woodruff (NOAA/CDC) AOPC/SLP WG meeting Norwich, UK November )iCOADS 2.0  COADS background 2)Data composition--future data enhancements 3)SLP data quality + metadata issues

International Comprehensive Ocean-Atmosphere Data Set (iCOADS) COADS: project since 1981: NOAA + NCAR 1985: Release 1 ( ) (ships and buoys) : partial releases  Release 2.0 (155M) 2002: I-COADS agreed: Boulder Workshop on the Use of Historical Marine Climate Data Open and unrestricted data distribution

Release 2.0 (dark blue) vs. Release 1 (light blue) reports/year F uture blend candidates: red (undigitized), yellow (partly), green (fully)

Mixture of ship/other data:

Japanese Whaling Ships (30K reports)

U.S. Marine Meteorological Journals (1.8 M reports)

National Composition: Release 1c

SST: Release 1 (left) Release 2.0 (right) Obs/2  box/decade: grey1-9 red10-99 orange yellow400-

SLP: Release 1 (left) Release 2.0 (right)

Wind speed: Release 1 (left) Release 2.0 (right)

iCOADS SLP: Data Quality + Metadata Issues Ship-buoy data homogeneity, metadata? Dutch deck 193 (gravity adj.) –HSST undetected dups + biases Barometer corrections + reporting practices? –New data additions: correction uncertainties: Norwegian ( )? Japanese Kobe ( )? –US Maury Collection ( ): Todd Mitchell Large negative anomalies: 1850s

Maury Collection (line) and SLP Bias Flags: 2 = gravity 1 = temp + gravity (  Todd Mitchell)

“ERSLP” (Smith and Reynolds 2002) SLP Quality Control Number of annual 2-degree super observations: the green line is the total number and the red dashed line is the number after quality control.

“ERSLP” (Recon) Spatial Correlations Spatial correlations (between 60S-60N) between the reconstruction and the Met Office analysis (GMSLP2), the Kaplan et al. (2000) analysis (KEA) and the reanalysis of Kalnay et al. (1996, Renal).

Second WMO Workshop on Advances in Marine Climatology Nov. 2003, Brussels Follow-up: CLIMAR99, Vancouver, 8-15 Sep Receive appropriate input: WMO Guide to the Applications of Marine Climatology (WMO--No. 781) Review the requirements of users: marine products, climate information, iCOADS Guidance and technical support: national MS/MCSS Celebrate 150th Anniversary: 1854 Brussels Conference