page 1 © crown copyright 2004 modern biases in in situ sst measurements john kennedy, nick rayner,...
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© Crown copyright 2004 Page 1Page 1
Modern biases in in situ SST measurements
John Kennedy, Nick Rayner, Philip Brohan, David Parker, Chris Folland, et al.
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Summary
SST measurement methods.
Introduction to the SST record.
Biases associated with each method.
Impacts of measurement method on climate monitoring.
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Measurement Methods
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Relating Measurement Method to Bias.
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SST (60˚N-60˚S) and uncertainties
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Japanese and Dutch SSTs
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American SSTs
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The changing balance
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Modern period 1970-2005
Metadata on measurement methods from
WMO publication 47 (1972-2005) ICOADS.VOSClim
WMO Pub. 47 being digitized back to 1953.
Kent, E. C., S. D. Woodruff and D. I. Berry, 2005: WMO Publication No. 47 Metadata and an Assessment of Observation Heights in ICOADS. Submitted to the Journal of Atmospheric and Oceanic Technology
Kent, E. C., and A. Kaplan, 2005: Towards Estimating Climatic Trends in SST, Part 3: Systematic Biases. Journal of Atmospheric and Oceanic Technology, in press
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Buckets v ERI
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Drifting Buoys vs Ships
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A Plague of Buoys
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Implications
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SSTdrifter-SSTship (average 1990-2005)
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Seasonal CycleD
iffe
ren
ce
(˚C
)
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Conclusions
There are biases in modern SST measurements
Current monitoring system is potentially good – random errors are small…
… but, errors due to biases are larger than random errors.
Predominance of buoys in recent data may be leading to an underestimate of warming.
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Further Work
•(A)ATSR instruments 1991-2005
•Buoy/Ship matchup database
1.3 Million ship-buoy pairs
Use VOSClim data
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Questions and Answers