Www.argans.co.uk SMOS L2 Ocean Salinity L1OP v620 border flag width 23 May 2014 ARGANS & L2OS ESL 0.010.02.

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SMOS L2 Ocean Salinity L1OP v620 border flag width 23 May 2014 ARGANS & L2OS ESL

SMOS L2 Ocean Salinity Smaller border width -> more retrievals Ascending orbit T173027

SMOS L2 Ocean Salinity Smaller border width -> lower Sigma_SSS Impact is at edges of swath > ±300 km No impact from belt/braces Ascending orbit T Cross-track transect at 20N Land impact?

SMOS L2 Ocean Salinity At ~50S different border width changes number of measurements -> increased Stokes3 std/ra-> false RFI detection -> need to change RFI thresholds Descending orbit T (eclipse contaminated)

SMOS L2 Ocean Salinity Smaller border width -> lower Sigma_SSS Impact is at edges of swath > ±300 km No impact from belt/braces Descending orbit T (eclipse contaminated) Land/ice impact? Cross-track transect at 0N

SMOS L2 Ocean Salinity Conclusions OTT may correct higher biases at borders, so data could be useful Border flag indicates decreased quality due to aliasing Impact of border flag width on L2OS in open ocean seen only at edges of swath Land near FOV may distort border flag TBs Maybe use width 0.015, as 0.01 sometimes misses edges of FOV? Need L1 radiometric analysis L1 border flag width