CHANGES TO MONTHLY UPDATE POSTS
I’ve changed the longitude used as the boundary between the Indian and South Pacific Oceans from 145E to 120E. With the Indian Ocean data extending north to 30N, the eastern boundary of 145E was picking up too much of the western tropical North Pacific data. The new boundary of 120E reduces that overlap significantly.
The links to past posts have all been updated to the WordPress addresses.
I also no longer include the tinypic links below each graph. The graphs SHOULD now be linked directly so that all you have to do is click on them for the full-sized versions.
MONTHLY SST ANOMALY MAP
The map of Global OI.v2 SST anomalies for March 2011 downloaded from the NOMADS website is shown below.
March 2011 SST Anomalies Map (Global SST Anomaly = +0.11 deg C)
Monthly NINO3.4 SST anomalies are continuing their rise toward ENSO-neutral conditions. The Monthly NINO3.4 SST Anomaly is -0.92 deg C.
The SST anomalies in Northern Hemisphere dropped this month, but this was exceeded, slightly by the rise in the Southern Hemisphere. Global SST anomalies rose slightly (+0.012 deg C). The Global SST anomalies are presently at +0.11 deg C.
Monthly Change = +0.012 deg C
(2) NINO3.4 SST Anomaly
Monthly Change = +0.322 deg C
THE EAST PACIFIC VERSUS THE REST OF THE WORLD
As noted in the post Sea Surface Temperature Anomalies – East Pacific Versus The Rest Of The World, I have added these two datasets to the monthly updates. Both datasets have been adjusted for the impacts of volcanic aerosols, and both are smoothed with 13-month running-average filters to reduce the seasonal noise. The global oceans were divided into these two subsets to illustrate two facts. First, the linear trend of the volcano-adjusted East Pacific (90S-90N, 180-80W) SST anomalies since the start of the Reynolds OI.v2 dataset is basically flat.
(3) Volcano-Adjusted East Pacific (90S-90N, 180-80W)
And second, the volcano-adjusted SST anomalies for the Rest of the World (90S-90N, 80W-180) rise in very clear steps, in response to the significant 1986/87/88 and 1997/98 El Niño/La Niña events. It also appears as though the SST anomalies of this dataset are making another shift in response to the most recent ENSO event.
(4) Volcano-Adjusted Rest of the World (90S-90N, 80W-180)
EAST INDIAN-WEST PACIFIC
The SST anomalies in the East Indian and West Pacific continued their drop this month.
I’ve added this dataset in an attempt to draw attention to what appears to be the upward steps in response to significant El Niño events that are followed by La Niña events.
(5) East Indian-West Pacific (60S-65N, 80E-180)
Monthly Change = -0.032 deg C
Further information on the upward “step changes” that result from strong El Niño events, refer to my posts from a year ago Can El Nino Events Explain All of the Global Warming Since 1976? – Part 1 and Can El Nino Events Explain All of the Global Warming Since 1976? – Part 2
And for the discussions of the processes that cause the rise, refer to More Detail On The Multiyear Aftereffects Of ENSO – Part 2 – La Nina Events Recharge The Heat Released By El Nino Events AND…During Major Traditional ENSO Events, Warm Water Is Redistributed Via Ocean Currents -AND- More Detail On The Multiyear Aftereffects Of ENSO – Part 3 – East Indian & West Pacific Oceans Can Warm In Response To Both El Nino & La Nina Events
The animations included in the post La Niña Is Not The Opposite Of El Niño – The Videos further help explain the reasons why East Indian and West Pacific SST anomalies can rise in response to both El Niño and La Niña events.
NOTE ABOUT THE DATA
The MONTHLY graphs illustrate raw monthly OI.v2 SST anomaly data from December 1981 to March 2011, as it is presented by the NOAA NOMADS website linked at the end of the post.
MONTHLY INDIVIDUAL OCEAN AND HEMISPHERIC SST UPDATES
(6) Northern Hemisphere
Monthly Change = -0.020 deg C
(7) Southern Hemisphere
Monthly Change = +0.037 deg C
(8) North Atlantic (0 to 75N, 78W to 10E)
Monthly Change = -0.096 deg C
(9) South Atlantic (0 to 60S, 70W to 20E)
Monthly Change = -0.053 deg C
Note: I discussed the upward shift in the South Atlantic SST anomalies in the post The 2009/10 Warming Of The South Atlantic. It does not appear as though the South Atlantic will return to the level it was at before that surge, and where it had been since the late 1980s. That is, it appears to have made an upward step and continues to rise. Why? Dunno—yet.
(10) North Pacific (0 to 65N, 100E to 90W)
Monthly Change = -0.001 Deg C
(11) South Pacific (0 to 60S, 120E to 70W)
Monthly Change = +0.015 deg C
(12) Indian Ocean (60S to 30N, 20E to 120E)
Monthly Change = +0.070 deg C
(13) Arctic Ocean (65N to 90N)
Monthly Change = -0.026 deg C
(14) Southern Ocean (90S-60S)
Monthly Change = +0.084 deg C
WEEKLY SST ANOMALIES
The weekly NINO3.4 SST anomaly data portray OI.v2 data centered on Wednesdays. The latest weekly NINO3.4 SST anomalies are -0.634 deg C.
(15) Weekly NINO3.4 (5S-5N, 170W-120W)
The weekly global SST anomalies are at +0.109 deg C.
(16) Weekly Global
The Optimally Interpolated Sea Surface Temperature Data (OISST) are available through the NOAA National Operational Model Archive & Distribution System (NOMADS).