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New Sea Surface Temperature Products from SST_cci

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Three types of long-term dataset have been generated by the SST_cci team

  1. Sea surface temperatures (SSTs) from Along-Track Scanning Radiometers (ATSRs). These are output on a 0.05° latitude-longitude grid of average SSTs within cells. They come as daily files, with day-time and night-time retrievals separated. In the terminology of the Group for High Resolution SST, they are “L3U” (Level 3 uncollated data).
  2. Sea surface temperatures (SSTs) from Advanced Very High Resolution Radiometers (AVHRRs). These are output at locations corresponding to the original satellite viewing geometry, which for Global Area Coverage data form AVHRRs implies a spatial resolution of 4 to 25 km, depending on satellite zenith angle. They are compatible with the GHRSST L2P format definition.
  3. Gap-filled daily SSTs – “L4 SST”. This “analysed” SST is based on an improved version of the well-known Met Office system “OSTIA” for interpolating SSTs in time and space. The outputs are at 0.05° daily resolution.

Verification and validation of their content is complete and the products are available publicly from February 2014. To access the data users will need to visit the NEODC/CEMS website and follow the registartion instructions contained there.

ATSRs are designed to be highly accurate, stable and well enough characterized to support independent SST retrieval. However, their dual-view scanning geometry limits their daily coverage to a series of narrow swaths. In SST_cci, AVHRR SSTs are derived after AVHRR brightness temperatures have been adjusted to be consistent with the calibration of ATSRs. In this way, the AVHRRs can be made more accurate (smaller regional biases), stable (tied to the ATSRs over time) and independent of in situ observations (unlike all other existing AVHRR SST products). AVHRR SSTs do not have the same quality as the ATSRs, but can help underpin daily analysis by greatly increasing coverage (reducing sampling uncertainty).

A product user guide is also available. Please visit the PUG site for further details.