Tuesday, February 26, 2013

January 2013 GISS up 0.17°C



I posted earlier about problems with GISS. They have now posted the January anomaly, and it is 0.61°C, up from 0.44°C in December. That's a big rise, but less than the big drop in December. TempLS recorded a similar rise (0.15°C), and I blogged about that and the reasons here. NOAA also rose from 0.42°C to 0.54°C.

As usual below the fold I'll show the comaparative spatial distributions.


Monday, February 18, 2013

Hurricanes and SST - movies


I have posted animations of daily high-resolution NOAA/NCDC satellite SST data in various regions, including the North Atlantic. There are patterns there that can be associated with known ocean fluid mechanics, but others that can't. So I extended the movies to include hurricane tracks in the N Atlantic in recent years. I was curious to see whether they would leave footprints of cooler water.

The answer seems to be - sometimes. For example, Gordon in 2012 left a marked trail. But our SST data is daily and hurricanes can move a long way in a day. I've shown just the midday (UTC) positions.

In the process, I've experimented with yet another visual mechanism. This time I've gone back to a sort of animated slide show of jpg's. This gives best quality and control, but no video compression. For the N Atlantic, this seems to work because the number of data points is not so large. The controls are explained below the graphic.

Update - I've added a highlight collection of the best streakers. Click on the bottom selection (below 2005), labelled "Tops".

Thursday, February 14, 2013

January TempLS Global Temp up 0.15°C


I posted earlier about a delay due to a small hiatus in GHCN data posting. They have posted new data, so I have done the regular January analysis.

The temperature anomaly is up to 0.40°C, which is a rise of 0.15°C from the low December value. The satellite indices showed even steeper rises.

The warm areas in the plot below show up as NW N America (very cold in December), Central Asia, and Australia.

Tuesday, February 12, 2013

High Resolution SST regional movies

Recently I posted some screencap videos derived from the WebGL displayed sea surface anomaly temperatures. These excellent data are supplied by NOAA/NCDC, based on their OISST processing of AVHRR satellite data.

I have now been able to mechanize the process of production. I no longer use screen grabs, which was a major holdup. So I have now posted a page which has a much greater number of videos installed, covering various regions of interest. Some of these are up to date, and I plan to maintain them so. You should be at any stage able to replay the last 50 days of ENSO, or the last 100 days at 2-day resolution etc. Same for Arctic, Antarctic and N Atlantic.

Browser wars


I've been busy making SST movies. It's automated now, and I can produce lots, and keep them up to date. But showing them can be a nightmare. There are technical issues, but they seem to be mainly commercial or patent. So I've been producing movies in swf, flv, ogg, mp4 and it's still hard to get something that works for everyone.

But my latest frustration was kinda amusing. I thought to make with Javascript a different player for each browser. A bit of extra coding, but I've got pretty familiar with them all now. Javascript provides a navigator object which returns a appCodeName and an appName for each browser. So I thought I'll just use that to switch. Just have to find out the names they use.

Temperature tracking issues


I'm late posting on temperature this month. But it isn't for lack of attention. Odd things are happening. GHCN hasn't updated since 5 February. One can get a good estimate on the first few days, but it will be subject to correction when more data comes in.

The other oddity is that GISS, which has been having server trouble, won't respond to my script query for the monthly global average. I can see it. And it has updated for December, but not January. My monitoring page doesn't show their December figure. I could intervene manually, but I'm reluctant to. I also don't intervene to manually put in the UAH numbers which Roy Spencer announces - I wait till the script can see them.

Friday, February 1, 2013

More on SST movies


This follows an earlier post which has .swf movies derived from the HiRes NOAA SST page. This has the WebGL rotatable globe with a shaded 1/4° plot and lots of daily data, courtesy of NOAA/NCDC and partners.

I've made some improvements, mainly to aid the showing and making of animations. Although the ordinary videos are easy to start up, I'm hoping to make the WebGL version equally accessible. The resolution is much better, especially with zooming, and, well, it's just fun to be able to rotate the globe while the animation is in progress.

So I've added a Pause button and a Step button. I've also systematised the buttons so each has pretty much a toggle function, and turns red when it's on. That helps, because the logic of how they all interact is now complicated, though I hope intuitive.