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Variability and uncertainty in measuring sea surface temperature

Variability and uncertainty in measuring sea surface temperature
Variability and uncertainty in measuring sea surface temperature
Sea Surface Temperature (SST) measurement is one of the most easily obtainable climate variables. However, it is challenging to meet the required absolute accuracy and long term stability whether the data are derived by in situ or satellite measurements. This study explores the quality of SST measurements, in particular those derived by the Advanced Along Track Scanning Radiometer (AATSR) and in situ measurements recorded by the shipborne Infrared Sea surface temperature Autonomous Radiometer (ISAR), which are used for validating AATSR data. Its broad objective is to improve understanding of measurement uncertainties in order to quantify the quality of satellite derived SST used for climate records.

The uncertainties of in situ measurement by ISAR have been analysed and modelled in order to estimate an independent measurement uncertainty for every SST data point in the ISAR records. In a complementary study the separate uncertainties of the SST as observed by AATSR, ISAR and ship-based hull-mounted thermometry (SSTdepth), when observing the same track, have been resolved by means of three way uncertainty analysis. This not only serves to verify the ISAR uncertainty model but also demonstrates the effectiveness of using shipborne radiometry in preference to in water thermometry from ships or buoys for validating satellite SST products. A third area of study concerns the errors and uncertainties when comparing satellite and in situ observations, which result from failure to properly match the in situ observations to what the satellite sees". A new method has been developed for classifying the match-up quality" of each data pair. Its use is demonstrated to show that the quality of AATSR data may be better than classical validation match.
Wimmer, Werenfrid
7b66c35e-5f83-4f95-82e3-5ced9614f28d
Wimmer, Werenfrid
7b66c35e-5f83-4f95-82e3-5ced9614f28d
Robinson, Ian
548399f7-f9eb-41ea-a28d-a248d3011edc

(2012) Variability and uncertainty in measuring sea surface temperature. University of Southampton, Ocean and Earth Science, Doctoral Thesis, 244pp.

Record type: Thesis (Doctoral)

Abstract

Sea Surface Temperature (SST) measurement is one of the most easily obtainable climate variables. However, it is challenging to meet the required absolute accuracy and long term stability whether the data are derived by in situ or satellite measurements. This study explores the quality of SST measurements, in particular those derived by the Advanced Along Track Scanning Radiometer (AATSR) and in situ measurements recorded by the shipborne Infrared Sea surface temperature Autonomous Radiometer (ISAR), which are used for validating AATSR data. Its broad objective is to improve understanding of measurement uncertainties in order to quantify the quality of satellite derived SST used for climate records.

The uncertainties of in situ measurement by ISAR have been analysed and modelled in order to estimate an independent measurement uncertainty for every SST data point in the ISAR records. In a complementary study the separate uncertainties of the SST as observed by AATSR, ISAR and ship-based hull-mounted thermometry (SSTdepth), when observing the same track, have been resolved by means of three way uncertainty analysis. This not only serves to verify the ISAR uncertainty model but also demonstrates the effectiveness of using shipborne radiometry in preference to in water thermometry from ships or buoys for validating satellite SST products. A third area of study concerns the errors and uncertainties when comparing satellite and in situ observations, which result from failure to properly match the in situ observations to what the satellite sees". A new method has been developed for classifying the match-up quality" of each data pair. Its use is demonstrated to show that the quality of AATSR data may be better than classical validation match.

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Published date: 1 December 2012
Organisations: University of Southampton, Ocean and Earth Science

Identifiers

Local EPrints ID: 359071
URI: http://eprints.soton.ac.uk/id/eprint/359071
PURE UUID: 20e4dc50-d9aa-4e93-9f97-9ea613fd061f
ORCID for Werenfrid Wimmer: ORCID iD orcid.org/0000-0003-4693-1161

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Date deposited: 23 Oct 2013 14:22
Last modified: 06 Jun 2018 12:44

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