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A new version of HadSLP

A new version of HadSLP. Rob Allan, Tara Ansell, David Parker, Philip Brohan & Nick Rayner. Outline. HadSLP version 1.0 Methodology Problems with HadSLP 1.0 New Marine (I-COADs) and land obs. Preliminary results Summary and future plans. HadSLP 1.

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A new version of HadSLP

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  1. A new version of HadSLP Rob Allan, Tara Ansell, David Parker, Philip Brohan & Nick Rayner

  2. Outline • HadSLP version 1.0 • Methodology • Problems with HadSLP 1.0 • New Marine (I-COADs) and land obs. • Preliminary results • Summary and future plans

  3. HadSLP 1 • Gridded 5 x 5 degree product, 1871-1998 • Marine - Met Office Marine data bank & COADS • Land - CSIRO, NIWA, CRU, CLIMAT, GHCN, Roseau Mondial, WWR & various sources • Employed Reduced Space Optimum Interpolation (RSOI, Kaplan et al. 1997) to give globally complete coverage

  4. Methodology • Quality control (QC) • Marine data QC involves comparison to background field. • standard gravity, ship deckheights, Paris longitude, reduction to mean sea level, correction for effect of semi-diurnal oscillation, nearest neighbour checks, remove jumps, trends (with reference to station histories) • Gridding & blending of marine and land obs • Interpolate over data sparse regions (RSOI)

  5. Problems with HadSLP 1.0 • Spurious trends in the high southern latitudes • evident in NCEP reanalysis and ECMWF fields, which were used to create the EOF patterns for the RSOI analysis. • Poor spatial coverage in high southern latitudes • Static error field • Unable to be readily updated in near real time

  6. HadSLP annual trend

  7. New data sources • Extend HadSLP to 1850-2001 • Marine • I-COADs • Land • digitisation efforts • requests for data through international collaboration

  8. Preliminary Results • Marine observations • gridded marine MSLP product, 1826-2001 • increased coverage in southern mid-latitudes • potential to remove spurious trend • Land observations • anticipate to increase number of stations from 719 to, roughly, 1500 (as collected to date).

  9. Improved spatial coverage: 1871 Hadslp (land & marine) I-COADs (marine only) Number of observations

  10. Improved spatial coverage: 1980 Hadslp (land & marine) I-COADs (marine only) Number of observations

  11. Future plans • Include uncertainty estimates • Updated in near real time • Include I-COADs wind measurements and potentially CLIWOC records. • Bring to 24 hour means • Non-static error field for RSOI analysis

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