Abstract
A comparison between in situ and satellite sea surface temperature (SST) is presented for the Western Mediterranean Sea during 1999. Several international databases are used to extract in situ data (World Ocean Database, MEDAR/Medatlas, Coriolis Data Center, International Council for the Exploration of the Sea and International Comprehensive Ocean-Atmosphere Data Set). The in situ data are classified into different platforms or sensors (conductivity–temperature–depth, expendable bathythermographs, drifters, bottles, and ships), in order to assess the relative accuracy of these type of data with respect to Advanced Very High Resolution Radiometer SST satellite data. It is shown that the results of the error assessment vary with the sensor type, the depth of the in situ measurements, and the database used. Ship data are the most heterogeneous data set, and therefore present the largest differences with respect to in situ data. A cold bias is detected in drifter data. The differences between satellite and in situ data are not normally distributed. However, several analysis techniques, as merging and data assimilation, usually require Gaussian-distributed errors. The statistics obtained during this study will be used in future work to merge the in situ and satellite data sets into one unique estimation of the SST.
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Alvera-Azcárate A, Barth A, Rixen M, Beckers J-M (2005) Reconstruction of incomplete oceanographic data sets using Empirical Orthogonal Functions. Application to the Adriatic Sea surface temperature. Ocean Model 9:325–346. doi:10.1016/j.ocemod.2004.08.001
Alvera-Azcárate A, Sirjacobs D, Barth A, Beckers J-M (2011) Outlier detection in satellite data using spatial coherence. Rem Sens Environ (submitted)
Anderson TW, Darling DA (1952) Asymptotic theory of certain “goodness-of-fit” criteria based on stochastic processes. Ann Math Stat 23:193–212
Barton I (2007) Comparison of In Situ and Satellite-Derived Sea Surface Temperatures in the Gulf of Carpentaria. J Atmos Oceanic Technol 24:1773–1784
Beckers J-M, Rixen M (2003) EOF calculations and data filling from incomplete oceanographic data sets. J Atmos Oceanic Technol 20(12):1839–1856
Castro SL, Wick GA, Jackson DL, Emery WJ (2008) Error characterization of infrared and microwave satellite sea surface temperature products for merging and analysis. J Geophys Res 113(C03010). doi:10.1029/2006JC003829
Donlon C, Casey KS, Robinson IS, Gentemann CL, Reynolds RW, Barton I, Arino O, Stark J, Rayner N, Le Borgne P, Poulter D, Vazquez-Cuervo J, Armstrong E, Beggs H, Llewellyn-Jones D, Minnett PJ, Merchant CJ, Evans R (2009) The GODAE high-resolution sea surface temperature pilot project. Oceanography 22(3):34–45
Emery W, Baldwin DJ, Schlüssel P, Reynolds R (2001a) Accuracy of in situ sea surface temperatures used to calibrate infrared satellite measurements. J Geophys Res 106(C2): 2387–2405
Emery W, Castro S, Wick G, Schluessel P, Donlon C, (2001b). Estimating sea surface temperature from infrared satellite and in situ temperature data. Bull Am Meteorol Soc 82(12):2773–2785
Gentemann C, Minnett P, Sienkiewicz J, DeMaria M, Cummings J, Jin Y, Doyle J, Gramer L, Barron C, Casey K, Donlon C (2009) MISST: the multi-sensor improved sea surface temperature project. J Oceanogr 22(2):78–89
Guan L, Kawamura H (2004) Merging satellite infrared and microwave SSTs: methodology and evaluation of the New SST. J Oceanogr 60:905–912
Ingleby B (2010) Factors affecting ship and buoy data quality: a data assimilation perspective. J Atmos Ocean Technol 27:1476–1489
Kent C, Kennedy J, Berry D, Smith R (2010) Effects of instrumentation changes on sea surface temperature measured in situ. WIREs Climate Change 1(5):718–728. doi: 10.1002/wcc.55
Kent C, Taylor P, Truscott B, Hopkins J (1993) The accuracy of voluntary observing ships’ meteorological observations - results of the VSOP-NA. J Atmos Ocean Technol 10:591–608
Kent E, Challenor P (2006) Toward estimating climatic trends in SST. Part II: random errors. J Atmos Ocean Technol 23:476–486
Locarnini RA, Mishonov AV, Antonov JI, Boyer TP, Garcia HE (2006) World ocean atlas 2005, volume 1: temperature. tech. rep., NOAA. Washington. 182 pp
MEDAR-Group (2002) MEDATLAS/2002 database. Mediterranean and black sea database of temperature salinity and bio-chemical parameters. Climatological Atlas. Ifremer edition 4 CD-ROM
Reynolds R, Smith T, Liu C, Chelton D, Casey K, Schlax M (2007) Daily high-resolution-blended analyses for sea surface temperature. J Climate 20:5473–5496
Robinson IS (2004) Measuring the oceans from space. The principles and methods of satellite oceanography. Springer, London. 669 pp
Sirjacobs D, Alvera-Azcárate A, Barth A, Lacroix G, Park Y, Nechad B, Ruddick K, Beckers J-M (2011) Cloud filling of ocean color and sea surface temperature remote sensing products over the southern north sea by the data interpolating empirical orthogonal functions methodology. J Sea Res 65:114–130
Taylor KE (2001) Summarizing multiple aspects of model performance in a single diagram. J Geophys Res 106(D7):7183–7192
Xu F, Ignatov A (2010) Evaluation of in situ sea surface temperatures for use in the calibration and validation of satellite retrievals. J Geophys Res 115:C09022. doi:10.1029/2010JC006129
Acknowledgements
This work was realized in the context of the HiSea—SR/12/140 project funded by the Belgian Science Policy (BELSPO) in the frame of the Research Program For Earth Observation “STEREO II”. The AVHRR Oceans Pathfinder SST data were obtained through the online PO.DAAC Ocean ESIP Tool (POET) at the Physical Oceanography Distributed Active Archive Center (PO.DAAC), NASA Jet Propulsion Laboratory, Pasadena, CA. The different providers for the databases used (World Ocean Database, MEDAR/MedAtlas, Coriolis Data Center, the International Council for the Exploration of the Sea and the International Comprehensive Ocean-Atmosphere Data Set) are also acknowledged for their important work of compiling extensive amounts of data and making them publicly available. The National Fund for Scientific Research, Belgium, is acknowledged for funding the post-doctoral positions of A. Alvera-Azcárate and A. Barth and for funding C. Troupin’s thesis through a FRIA grant. This is a MARE publication.
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Responsible Editor: Pierre-Marie Poulain
This article is part of the Topical Collection on Multiparametric observation and analysis of the Sea
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Alvera-Azcárate, A., Troupin, C., Barth, A. et al. Comparison between satellite and in situ sea surface temperature data in the Western Mediterranean Sea. Ocean Dynamics 61, 767–778 (2011). https://doi.org/10.1007/s10236-011-0403-x
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DOI: https://doi.org/10.1007/s10236-011-0403-x