Monthly Archives: April 2010

UAH Channel 5 Anomaly Trends

Lucia at The Blackboard has on on-going bet where readers submit predictions of the monthly UAH anomaly, the April bet post is here.

Lucia does some very interesting climate analysis, some of her charts, however,  can give me a headache if I stare at them to long. Let’s look at her April UAH bet chart(Warning, may give you a headache if you look for too long)

What can we say about this chart? Well, um, ah, – – –  let’s be positive:

  • It was done in Excel. The ugly grey shading gives Excel away every time
  • It’s colorful, yes, very colorful
  • It has lots of data, yes, lots of data
  • It is clearly labeled

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Climate Oscillations and GISS Temperature Anomaly Trends

In this post, I examine the combined impacts of Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO) and El Nino – Southern Oscillation (ENSO)   on the long-term GISS Land and Ocean Temperature Anomaly (LOTA) trend.


Professor Don Easterbrook of Western Washington University  has stated …

“The PDO cool mode has replaced the warm mode in the Pacific Ocean, virtually assuring us of about 30 years of global cooling, perhaps much deeper than the global cooling from about 1945 to 1977.”  source

Easterbrook’s PDO theory is repeated  here and here. Clearly he believes that the shift in PDO phase from warm to cool will have a significant impact on global temperatures for the next 30 years.

In this post I take a closer look at PDO, AMO and ENSO indexes to see how they are related to the GISS anomaly trends.

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RClimate Script: Pacific Decadal Oscillation Trend

This RClimate Script lets users retrieve and plot the monthly and moving average  Pacific Decadal Oscillation (PDO) data  from the University of Washington’s JISAO website. The script retrieves the PDO data from January, 1900 until latest month available at time script is run.  The trend chart shows the JISAO PDO trend and user selected moving average period.

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Visualizing Arctic Sea Ice Extent Trends

Reader GH sent me an e-mail asking about a previous Arctic sea ice extent trend post (click). GH asked ….

“Why is there such a difference between this type of representation and the chart at link ? What you’ve written above seems to imply that the definitions of extent are the same.   Just looking at 2002 – present,  I’m not clear why the JAXA chart doesn’t appear to demonstrate the same clear trend. ..”

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