Triple collocations of SST observations from ATSR-2/AATSR, drifting buoys and TMI/AMSR-E. The ATSR-2/AATSR observations are from the respective prouct of CCI SST Phase 1 (Merchant, C.J.; Embury, O.; Roberts-Jones, J.; Fiedler, E.K.; Bulgin, C.E.; Corlett, G.K.; Good, S.A.; McLaren, A.; Rayner, N.A.; Donlon, C. (2014): ESA Sea Surface Temperature Climate Change Initiative (ESA SST CCI): Along-Track Scanning Radiometer (ATSR) level 3 uncollated data (L3U) long-term product version 1.1. NERC Earth Observation Data Centre, 29 May 2014. doi:10.5285/79229cee-71ab-48b6-b7d6-2fceccead938. http://dx.doi.org/10.5285/79229cee-71ab-48b6-b7d6-2fceccead938). The observations of TMI/AMSR-E are from version 7 produced by Remote Sensing Systems. TMI data were produced by Remote Sensing Systems and sponsored by the NASA Earth Sciences Program. Data are available at www.remss.com/missions/tmi. AMSR data are produced by Remote Sensing Systems and were sponsored by the NASA AMSR-E Science Team and the NASA Earth Science MEaSUREs Program. Data are available at www.remss.com.