>MONTHLY SST ANOMALY MAP
The map of Global OI.v2 Sea Surface Temperature anomalies for April 2009 provided by NOMADS is shown below. Global SST anomalies rose approximately 0.037 deg C. The North Pacific shows the typical negative PDO pattern. The equatorial Pacific shows neutral ENSO conditions.
April 2009 SST Anomalies Map (Global SST Anomaly = +0.174 deg C)
The Atlantic Multidecadal Oscillation as calculated by the NOAA ESRL is detrended North Atlantic SST anomalies. Since OI.v2 SST data begins in November 1981, it does not seem appropriate to use a 28-year trend on a cycle that lasts about 60 years, so I am not presenting the AMO. Using North Atlantic SST anomalies as a reference, the AMO will have continued its drop in April. Scroll down for the North Atlantic SST anomalies.
The monthly change (April 2009 Minus March 2009) in Global SST anomalies was approximately +0.037 deg C. NINO3.4 SST anomalies continue to rise. There were significant changes in the South Atlantic (+0.185 deg C) and the North Pacific (-0.178 deg C).
NOTES ABOUT THE DATA
The first NINO3.4 SST anomaly graph illustrates raw WEEKLY OI.v2 SST anomaly data that’s centered on Wednesdays, from January 3, 1990 to April 22, 2009. The rest of the graphs illustrate raw monthly OI.v2 SST anomaly data from November 1981 to April 2009.
NINO3.4 SST ANOMALIES BASED ON WEEKLY OI.v2 SST DATA
NINO3.4 SST Anomaly (Weekly)
Present Value = -0.148
MONTHLY OI.v2 SST UPDATES
NINO3.4 SST Anomaly (Monthly)
Monthly Change = +0.246 deg C
Monthly Change = +0.037 deg C
Monthly Change = -0.033 deg C
Monthly Change = +0.092 deg C
North Atlantic (0 to 75N, 78W to 10E)
Monthly Change = -0.037 deg C
South Atlantic (0 to 60S, 70W to 20E)
Monthly Change = +0.185 deg C
North Pacific (0 to 65N, 100 to 270E, where 270E=90W)
Monthly Change = -0.178 Deg C
South Pacific (0 to 60S, 145 to 290E, where 290E=70W)
Monthly Change = +0.093 deg C
Indian Ocean (30N to 60S, 20 to 145E)
Monthly Change = -0.075 deg C
Arctic Ocean (65 to 90N)
Monthly Change = -0.073 deg C
Southern Ocean (60 to 90S)
Monthly Change = +0.058 deg C
The Optimally Interpolated Sea Surface Temperature Data (OISST) are available through the NOAA National Operational Model Archive & Distribution System (NOMADS).
>The South Atlantic is ~.2 C degree higher than anything else in the Nov 81 to Mar 2009 data. It seems to be responsible for the SH anomaly. Are there any reports as to why this is happening?
>I haven’t read anything about the South Atlantic, John. I’ve been keeping an eye out.
>The two Atlantic regions seem to operate almost like a dipole with the differential between the two cycling between +/- 1.0C.The cycle seems to be about 60 years with peak differentials occuring around 1878, 1936, and 2003 or 2007 for the latest one. But I tend to think climate cycles are not as regular as it sometimes looks.The new cycle could be starting …… or it all could just be an artifact or chance. I note that the temperature anomaly differential between the two hemispheres seems to be closing recently – almost the same now.
>The divergence of the SH SST from both the global values and SH atmospheric temperatures is striking.One possible explanation is more SH sea ice = less cold ocean to measure. Hence higher average.Philip_B