Comparisons of Daily Sea Surface Temperature Analyses for 2007–08 Public Deposited

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  • Six different SST analyses are compared with each other and with buoy data for the period 2007–08. All analyses used different combinations of satellite data [for example, infrared Advanced Very High Resolution Radiometer (AVHRR) and microwave Advanced Microwave Scanning Radiometer (AMSR) instruments] with different algorithms, spatial resolution, etc. The analyses considered are the National Climatic Data Center (NCDC) AVHRR-only and AMSR+AVHRR, the Navy Coupled Ocean Data Assimilation (NCODA), the Remote Sensing Systems (RSS), the Real-Time Global High-Resolution (RTG-HR), and the Operational SST and Sea Ice Analysis (OSTIA); the spatial grid sizes were 1/4°, 1/4°, 1/9°, 1/11°, 1/12°, and 1/20°, respectively. In addition, all analyses except RSS used in situ data. Most analysis procedures and weighting functions differed. Thus, differences among analyses could be large in high-gradient and data-sparse regions. An example off the coast of South Carolina showed winter SST differences that exceeded 5°C. To help quantify SST analysis differences, wavenumber spectra were computed at several locations. These results suggested that the RSS is much noisier and that the RTG-HR analysis is much smoother than the other analyses. Further comparisons made using collocated buoys showed that RSS was especially noisy in the tropics and that RTG-HR had winter biases near the Aleutians region during January and February 2007. The correlation results show that NCODA and, to a somewhat lesser extent, OSTIA are strongly tuned locally to buoy data. The results also show that grid spacing does not always correlate with analysis resolution. The AVHRR-only analysis is useful for climate studies because it is the only daily SST analysis that extends back to September 1981. Furthermore, comparisons of the AVHRR-only analysis and the AMSR+AVHRR analysis show that AMSR data can degrade the combined AMSR and AVHRR resolution in cloud-free regions while AMSR otherwise improves the resolution. These results indicate that changes in satellite instruments over time can impact SST analysis resolution.
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  • Reynolds, Richard W., Dudley B. Chelton, 2010: Comparisons of Daily Sea Surface Temperature Analyses for 2007–08. Journal of Climate, 23, 3545–3562.
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  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2012-02-14T21:28:00Z No. of bitstreams: 1 CheltonDudleyB.CEOAS.ComparisonsDailySea.pdf: 6215399 bytes, checksum: d2a94e0e52a034f1c92d4d7fbed9d367 (MD5)
  • description.provenance : Made available in DSpace on 2012-02-14T21:28:00Z (GMT). No. of bitstreams: 1 CheltonDudleyB.CEOAS.ComparisonsDailySea.pdf: 6215399 bytes, checksum: d2a94e0e52a034f1c92d4d7fbed9d367 (MD5) Previous issue date: 2010-07

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