Medspiration â System Requirements Document - Data User Element

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Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry 60 Figure WP2-188 Functional breakdown diagram of data processing steps to produce L2P data records for microwave satellite SST NASR 2.2.2.1 data files. 60 WP-ID2.2.2.2 Test for possible sidelobe contamination 60 WP2-189 Microwave SST observations within about 50 to 100 km from land and sea ice are affected by the warm emission of land NASR and ice entering the antenna side-lobes. The effect varies by region and season (e.g., in monsoon climates where more contamination is expected in wet ground conditions) and is difficult to quantify without having access to engineering data provided by the satellite sensor. 60 WP2-190 It cannot be quantified using buoy match-ups in the coastal zone. NASR 60 WP2-191 Instead, global reference maps identifying regions with persistent sidelobe contamination will be generated by Remote NASR Sensing Systems to provide an estimate the retrieval error in coastal zones and near sea ice margins. 60 WP2-192 The geolocation of each pixel will be used to look up possible contamination from the reference map. NASR 61 WP2-193 Since the effect is different for the 10.7 GHz and 6.9 GHz retrievals, it must be calculated separately for TMI and AMSR-E NASR radiometers. We will approach this problem in two ways. Initially, TMI will be collocated with VIRS infrared SSTs while AMSR-E will be collocated with MODIS SST retrievals. The bias and variability in the STD will be calculated as the STD as a function of geographic location minus the minimum STD as a function of geographic location. This may be done using only retrievals within 200 km of land or ice or it may be done globally. There are several issues with this methodology that should be considered. There will be some overlap with dependencies on SST and wind speed. If the check is only used close to land, it will ignore possible side-lobe effects near frontal features, but if it is used globally, increased variability from the IR sensors due to water vapour or stray light will be included. It is expected that further work will be required to establish the optimum configuration of sidelobe contamination maps. 61 The GDS specifies the following rule: 61 Rule WP2-194 · Rule 2.2.2.2a: If a pixel is located within an area of known sidelobe contamination as defined by sensor specific CFD.0110 © 2004 SOC Page 152 of 193
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry 2.2.2.2a sidelobe contamination maps, bit 0 of the L2P confidence data variable MW_SST_flags should be set. 61 Rule WP2-195 · Rule 2.2.2.2b: If a sidelobe contamination map is not available, any pixel within sidelobe_distance_threshold CFD.0120 2.2.2.2b (specified in the L2P configuration file in km) d should flagged as contaminated. 61 WP-ID2.2.2.3 Strict test for possible rain contamination 61 WP2-196 SST cannot be retrieved in raining conditions and data flagged as rain contaminated must be rejected from the L2P data QLC.0065 file. The GDS specifies the following rule: 61 Rule WP2-197 · Rule 2.2.2.3: If a measurement is identified as rain contaminated in the native data input file, this measurement QLC.0065 2.2.2.3 should not be included in a L2P data file. 61 WP-ID2.2.2.4 Relaxed test for possible rain contamination 61 WP2-198 A recognized problem in the MW SST retrievals is unidentified rain contamination in the SST, often nearby raining pixels. NASR Low rain rates or small areas of rain within the large MW footprint are difficult to identify and in many cases, the quality of SST retrievals surrounding a rain flagged pixel are degraded by unresolved rain. 61 WP2-199 For this reason, pixels within a defined radius relaxed_MW_rain_distance (specified in km and held within the L2P CFD.0140 configuration file) of a raining pixel will be flagged as potentially rain contaminated. 61 WP2-200 In addition, a comparison of the previous analysed SST values will be used to reject or accept the measurement for CFD.0150 inclusion within a L2P file if the difference is greater than a predefined threshold specified in K and held in the L2P configuration file variable relaxed_rain_threshold. 61 The GDS specifies the following rules: 61 Rule WP2-201 · Rule 2.2.2.4a: If a pixel lies within a radius of relaxed_MW_rain_distance specified in km of a clearly flagged rain CFD.0140 2.2.2.4a contaminated pixel, bit 1 of the L2P confidence data variable MW_SST_flags should be set. 61 Rule WP2-202 · Rule 2.2.2.4b: If the difference between the most recent GHRSST-PP analysis SST and the potentially CFD.0150 2.2.24b contaminated pixel is greater than relaxed_rain_threshold (K), the pixel should not be included in a L2P data file. © 2004 SOC Page 153 of 193
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Medspiration â System Requirements Document - Data User Element