Raikoke eruption retrieving SO2 column amounts too low. Improved by retrieving
v3 then v1 sequentially. Might be due to ash, as shown by different surface
temperatures retrieved in the two bands. Might need joint retrieval of SO2 and ash.
OCS (AD)
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OCS using Scaled Linear Retrieval results.
MPhys report from Edwin Phua shows plausible OCS distributions over the oceans,
low OCS in tropical forests, but
large diurnal signatures over land/desert.