Weekly global sea surface temperature (SST) data can be noisy, capturing very short-term responses to weather, seasonal components, and the El Niño-Southern Oscillation (ENSO). The preliminary and the February sea surface temperature anomaly updates included graphs of weekly global SST anomalies starting in 2004. They showed a sudden rise over 3 weeks in February. The rebound has ended, with global SST anomalies dropping significantly over the past 2 weeks.
Weekly Global Sea Surface Temperature Anomalies
While that rise in global sea surface temperature anomalies appears unusual in that short-term graph, we can present the data in another way to illustrate that there have been a couple of 3-week rises in global SST anomalies in the past that were comparable or greater. The next graph illustrates the 3-week change in global sea surface temperature anomalies, from the start of the Reynolds OI.v2 sea surface temperature data. The change is calculated as the weekly value minus the value from 3 weeks before. [Note that I spliced the early period (November 1, 1981 to December 31, 1989) to the later data (starting January 3, 1990).]
3-Week Change in Global Sea Surface Temperature Anomalies
The Reynolds Optimally Interpolated Sea Surface Temperature Data (OISST) are available through the NOAA National Operational Model Archive & Distribution System (NOMADS).