It is time to stop quivering in our boots in pointless fear of the future and just roll up our sleeves and build it.
- Ray Pierrehumbert

Thursday, June 3, 2010

Still Going

Wondering what the May temperature anomaly maps will look like. Isn't El Nino supposed to have wound down?

Anyway the UAH near-surface channel continues to be a rather disconcerting outlier. (Click the image for focus.)

10 comments:

mothincarnate said...

Certainly interesting - plus a lot of strange weather being reported as well.

Guillaume Tell said...

You are being a nonconformist in your choice of the more obvious "near surface layer(ch04)" UAH amsu graph.

Other websites generally suggest the less obvious 14000ft channel 5, without ever giving an explanation.

The message is the same on both.

barry said...

RSS just published their TLT May anomaly

0.588C is the second warmest anomaly since May 1998 - 0.668C.

Nick Barnes said...

There's no mystery about the use of channel 5. That channel allows one to plot 20-year highs and lows, which are not available in channel 4.

barry said...

I find the set up at that site odd. The y axis values appears to be upside down, there's no data for half of the 'controversial' 1998, and there is a temp rise hump in the middle of every year that seems at odds with their data, where the higher temps are Oct - Mar for some years. And, as Nick pointed out, there are more utilities for the channel 05 data than the surface channel (04), which is where the point of controversy is strongest (isn't it?).

I'm no expert, so if someone could explain these things, or confirm that they're a bit odd, I'd be grateful.

barry said...

Just remembered - the 1998 data is truncated because that's when the data stream starts for the current satellite they're using.

Michael Tobis said...

The y axis is negative, and the record started in 1998.

As for ch 4 vs ch 5, I am not sure. I guess there is more scientific interest in a pure tropospheric signal than one where some land temps may mix in.

Greg said...

The negative nature of the y-axis is because it's not actually showing temperature - it's showing "brightness temperature" which takes a little explanation.

And there really is a seasonal variation because (a) different amount of land in northern vs southern hemispheres and (b) eccentricity of Earth's orbit. Compare the seasonal variation of the sea surface chart with that of ch04/ch05. It'll make sense if you think about it.

barry said...

Thanks for clearing that up for me.

The UAH May anomaly has come out.

http://www.drroyspencer.com/2010/06/may-2010-uah-global-temperature-update/

barry said...

The temperature time series at the Met Office has 2010 slightly warmer than 1998... so far.

http://hadobs.metoffice.com/hadcrut3/diagnostics/global/nh+sh/