Global SST Time Series
The global average sea surface temperature (SST) change over time since 1991. We see 2015 as the warmest year for SST, with a marked increase since 2012. A similar sharp rise was seen in 1997/8, which was also the result of a major El Nino event. As then, it is likely that the global SST will drop down again during 2016 to temperatures more typical of recent years.
Global time series of satellite sea surface temperature (SST) anomaly, in comparison with a climate data record from the UK Hadley Centre. Satellite data: from ATSR Reprocessing for Climate (ARC), two (red line) or three (black line) wavelengths for estimating SST. In situ data: grey band represents the spread of an ensemble of equally likely realisations of a global time series estimated from ship and buoy measurements. Note: the ARC time series are preliminary, being generated from the ARC data set by a tool still under testing within the SST CCI project; the SST climatologies underlying the anomaly calculations in this plot have not yet been harmonised between satellite and in situ time series. The wedge labelled "Estimated ARC trend uncertainty" represents the spread of potential bias in the satellite data relative to the end of the time series.