Medspiration â System Requirements Document - Data User Element

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Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F models. It is never observed directly by satellites, but it comes closest to being detected by a microwave radiometer which penetrates the skin, at dawn when the previous day’s diurnal stratification can be assumed to have decayed and SSTsubskin, SSTdepth and SSTfnd are equal. Figure 2-1 Schematic diagram showing (a) idealised night-time vertical temperature deviations from SSTfnd and (b) idealised day-time vertical temperature deviations from SSTfnd in the upper ocean. Although the distinctions between the different definitions of SST may seem arcane, they are very significant when uncertainties of temperature measurement less than 0.3ºC are being sought. 2.1.2 Medspiration SST Products The Medspiration processing system (MPS) will adhere closely to the data processing model and product specifications defined by the GHRSST-PP [RD.1]. It will produce the following data products: • L2P SST products for the European RDAC area which spans from 70S to 90N (to the ice limit) and from 100W to 45E and contains the whole Atlantic and the adjacent European seas (see Figure 2-2). Parts of the Pacific Ocean within these limits are expressly excluded. L2P products consist of the L2 SST data in their native sampling grid as ingested, with the addition of a quantitative confidence value attached to every data point. The confidence value will be based on the sensor specific error © 2004 SOC Page 16 of 193
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F statistics (SSES) to be supplied by GHRSST-PP and ancillary data such as wind speed and solar radiation, which can influence the diurnal variability of SST. The L2P data will be provided in near-real time to the GHRSST-PP global data assembly centre (GDAC) and to selected operational users in Europe for assimilation into ocean forecasting models. They will also be archived and served widely to general European users. Figure 2-2 The GHRSST-PP EURDAC product grid domain (Note that the Pacific areas are not included) • Available in situ measurements of SST will be matched with coincident samples within the L2P SST data, in order to prepare records for delivery to the GHRSST-PP match-up data base (MDB). This is required by GHRSST-PP to determine the sensor specific error statistics (SSES) needed when assigning quality values for the L2P data. The geographical scope of the MDB records to be delivered is the same European area as defined for the L2P products. • A L4 SST product will be produced at ultra-high resolution (UHR) on a 2 × 2 km grid for the Mediterranean Sea (see Figure 2-3). Optimal interpolation (OI) techniques will be used to combine coincident L2P measures of SST from different types of sensor and to fill gaps where no observations are available. Whereas L2P data essentially represent the skin or sub-skin SST, the L4 SST product is defined to represent SSTfnd (as explained in 2.1.1) and is updated only once every 24 hr. Using GHRSST-provided parameterisations of the skin layer and diurnal thermocline thermal structure, L2P products will be converted to SSTfnd before applying OI. The © 2004 SOC Page 17 of 193
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Medspiration â System Requirements Document - Data User Element

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Medspiration â System Requirements Document - Data User Element