I’ve moved to WordPress: http://bobtisdale.wordpress.com/

Tuesday, June 2, 2009

May 2009 SST Anomaly Update

I’ve moved to WordPress.  This post can now be found at May 2009 SST Anomaly Update

The map of Global OI.v2 SST anomalies for May 2009 provided by NOMADS is shown below.
May 2009 SST Anomalies Map (Global SST Anomaly = +0.196 deg C)


Global SST anomalies rose approximately 0.037 deg C in May, with the two biggest contributors being the South Pacific with a rise of 0.081 deg C and the South Atlantic with a rise of 0.062 deg C. In fact, the South Atlantic is showing record high SST anomalies. (I’ll have to cross check the OI.v2 South Atlantic anomalies with ERSST.v2, ERSST.v3b, and HADISST data as soon as they become available.) The equatorial Pacific shows neutral ENSO conditions (Monthly NINO3.4 SST Anomaly = +0.265 deg C), but NINO3.4 SST anomalies rose 0.446 deg C in May.
Monthly Change = +0.037 deg C
NINO3.4 SST Anomaly
Monthly Change = +0.446 deg C


My Usual AMO Blurb: The Atlantic Multidecadal Oscillation as calculated by the NOAA ESRL is North Atlantic SST anomalies that have been detrended. 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 graphs illustrate raw monthly OI.v2 SST anomaly data from November 1981 to May 2009.

Northern Hemisphere
Monthly Change = -0.026 deg C
Southern Hemisphere
Monthly Change = +0.085 deg C
North Atlantic (0 to 75N, 78W to 10E)
Monthly Change = -0.070 deg C
South Atlantic (0 to 60S, 70W to 20E)
Monthly Change = +0.062 deg C
North Pacific (0 to 65N, 100 to 270E, where 270E=90W)
Monthly Change = -0.056 Deg C
South Pacific (0 to 60S, 145 to 290E, where 290E=70W)
Monthly Change = +0.081 deg C
Indian Ocean (30N to 60S, 20 to 145E)
Monthly Change = +0.013 deg C
Arctic Ocean (65 to 90N)
Monthly Change = +0.194 deg C
Southern Ocean (60 to 90S)
Monthly Change = +0.079 deg C


The weekly NINO3.4 SST anomaly data illustrate OI.v2 data centered on Wednesdays. The latest weekly NINO3.4 SST anomalies are +0.039 deg C.
Weekly NINO3.4 (5S-5N, 170W-120W)


The Optimally Interpolated Sea Surface Temperature Data (OISST) are available through the NOAA National Operational Model Archive & Distribution System (NOMADS).


Anonymous said...

Bob, your doing great job.
Why big(+) jump in southern ocean
Because heat transfer NH to SH,
or less cold upwelling southern
antarctic subsidence, or other reason.
Seems a bit strange with low solar
and low global TLT's.
Please explain.
regards KM

Bob Tisdale said...

KM, you asked, "Why big(+) jump in southern ocean sst's."

I presume you mean Southern Hemisphere, because the rise in Southern Ocean SST anomalies wasn't atypical and appeared to be in line with ENSO variability.

As noted in my follow-up post here...
...NOAA/CDC has updated the SST data for May 2009, decreasing SST anomalies in the Southern Hemisphere and raising them in the Northern Hemisphere. But the rise in the South Atlantic still appears unusual so I'll take a look at it in an upcoming post and try to isolate at least the area responsible for most of the rise.


MATT said...


Looking at the May MONTHLY SST ANOMALY MAP and the detail SST graphs , it is odd that only NORTH ATLANTIC and NORTH PACIFIC graphs show a +ve trend . Much of the oceans on lower half of the SOUTHERN HEMISPHERE below say 30S have light blue or dark blue shades indicating a positive anomaly of 1 to 0.5 C. Can you clarify?

Bob Tisdale said...

Matt, are we looking at the same temperature scale? The blues on the map above go from "darkest blue", covering a range of -2.5 to -2.0 deg C, to a very light blue, covering at range of 0 to +0.5 deg C.

Anonymous said...

Bob thanks for your reply.
Yes I ment Southern Hemisphere.
You will investigate unusual jump in south atlantic sst's.
Is all this heat transfered from North Central Pacific through Indian Ocean, dumped in South Atlantic via Agulhasrings and Benguela current ?
Then we are looking at THC circulation here.
Or is warm Southern Pacific ENSO
induced water flowing directly in
South Atlantic by means of West Wind Drift/Antarctic Circumpolair and Malvinas/Falkland Current.
I presume both in this case.
Looking forward for a post on global oceanic heat distribution
by means of currents and transfer to arctic and antarctica regions in specific.
Kind regards KM.

Bob Tisdale said...

KM: In my post "Animations of Ocean Heat Content, Depth-Averaged Temperature, and Sea Surface Height," I was hoping to illustrate the transport of heat from the South Pacific and southwest Indian Ocean to the South Atlantic and up into the North Atlantic. But the resolution on the Levitus OHC maps was very poor.

Anonymous said...

KM: In my post "Animations of Ocean Heat Content, Depth-Averaged Temperature, and Sea Surface Height," I was hoping to illustrate the transport of heat from the South Pacific and southwest Indian Ocean to the South Atlantic and up into the North Atlantic. But the resolution on the Levitus OHC maps was very poor.
Bob, how can I find this post ?
Resolution of ocean heat content maps poor, okay never mind, just
give me the link.
I appreciate your work.
Are you in oceanographics or engineer ?
I used to make weatherreports
for KNMI, when I sailed around
the world.
Bob are you aware of bimodal sun
and phasecatastrophe ?
We are experiencing phasecatastrophe now.
Did you notice 50% reduction polar solar magnetic fied strength.
Means strong reduction polar to toroïdal field conversion on the sun.
Low toroïdal field means no or
few sunspots.
We are in the middle of Dalton like
Minimum cycle 23/24 my projection 2010.9.
Hence Cyclelength 23 will
be 14.5 years, perhaps longer.
Maximum cycle 24 my projection 2016
with 22>SSN<70, my guess cycle 24 only SSN=22.
Impact on sst's and ice after couple of lagtime years will be huge.
Global air temperatures dropping
3.5 (14.5-11)x0.2=0.7 celsius.
Can you post about low solar effect
on sst's ?
regards KM.

Bob Tisdale said...

KM: My apologies. I should have provided a link to the post "Animations of Ocean Heat Content, Depth-Averaged Temperature, and Sea Surface Height." Here it is:
You may have to cut and paste it to your browser.

Also, there's a search window in the upper left-hand corner of the webpage. Just type in "animation".


Tips are now being accepted.

Comment Policy, SST Posts, and Notes

Comments that are political in nature or that have nothing to do with the post will be deleted.
The Smith and Reynolds SST Posts DOES NOT LIST ALL SST POSTS. I stopped using ERSST.v2 data for SST when NOAA deleted it from NOMADS early in 2009.

Please use the search feature in the upper left-hand corner of the page for posts on specific subjects.
NOTE: I’ve discovered that some of the links to older posts provide blank pages. While it’s possible to access that post by scrolling through the history, that’s time consuming. There’s a quick fix for the problem, so if you run into an absent post, please advise me. Thanks.
If you use the graphs, please cite or link to the address of the blog post or this website.