In my post
“What is missing from the otherwise excellent website (refering to website http://www.osdpd.noaa.gov/ml/ocean/sst/anomaly.html), of course, are time plots of the global average sea surface temperatures, as well as averages for different subregions of the oceans. With that information, we could more readily track the ocean contribution to the global average surface temperature trend, as well as anomalies within the subregions.”
Bob Tisdale on his weblog http://bobtisdale.blogspot.com/ has alerted us to his excellent weblog presentation with monthly updates of SST anomalies globally, and for hemispheric and ocean basin basins. His information is accessible at
The global average anomaly is currently well above average, but unless this positive anomaly continues for the coming months, the absence of a clear long term trend since 1998 remains (although the interannual variations are remarkably large).
As Bob writes
“NINO3.4 SST anomalies are dropping but El Niño conditions remained during April in the central tropical Pacific (Monthly NINO3.4 SST Anomaly = +0.68 deg C). Weekly data has fallen into ENSO-neutral ranges (+0.30 deg C). Global SST anomalies increased slightly again during April (0.017 deg C). On a hemispheric basis, the rise was limited basically to the Northern Hemisphere, since the increase in the Southern Hemisphere was negligible (0.002 deg C). And looking at the major ocean basins, the North Pacific, South Atlantic, Indian Ocean, and the East Indian-West Pacific Ocean datasets all show drops this month, but they were not strong enough to outweigh the rises in the North Atlantic and South Pacific.”
Bob also provides mid-month updates of NINO3.4 and global data using the weekly OI.v2 SST anomaly data, aka Reynolds SST data at http://bobtisdale.blogspot.com/2010/05/mid-may-2010-sst-anomaly-update.html. He writes
“NINO3.4 SST anomalies for the week centered on May 19, 2010 show that central equatorial Pacific SST anomalies are below zero and continuing their decline. Presently they’re at -0.21 deg C, which is in ENSO-neutral levels.”
“Weekly Global SST anomalies are still elevated, but they may have peaked for this El Nino. They are starting to show signs of a drop in response to the decline in central equatorial Pacific temperatures, but the global weekly data is much too variable to tell for sure.”
I recommend bookmarking this excellent, much needed weblog!