The CoRTAD contains global, approximately 4 km resolution SST data on a weekly
time scale from 1982 through 2009. In addition to SST, it contains SST anomaly
(SSTA, weekly SST minus weekly climatological SST), thermal stress anomaly (TSA,
weekly SST minus the maximum weekly climatological SST), SSTA Degree Heating Week
(SSTA_DHW, sum of previous 12 weeks when SSTA >= 1 degree C), SSTA Frequency
(number of times over previous 52 weeks that SSTA >= 1 degree C), TSA DHW
(TSA_DHW, also known as a Degree Heating Week, sum of previous 12 weeks when TSA
= 1 degree C),and TSA Frequency (number of times over previous 52 weeks that TSA
= 1 degree C).