Tuesday, November 14, 2006

Consistent Macquarie

Macquarie Island is an island half way between Australia and the Antarctic. It is officially according to the ABM part of the great ice continent. So why not do some analysis on that. We have luckily this time, temperature data at certain times of the day, and instead of littering a post with 10 graphs I shall merely put links there for them.

And here they are. Temperature deviations from the average for the times of midnight, 3am, 6am, 9am, noon, 3pm, 6pm and 9pm.

Whist the data only goes from the 1960’s, we do see a pattern amongst the data. It seems that in the years 1963 to 1973 we had a less than average mean monthly temperature. From the years 1977 to 1989 the temperature was on average 0.3 degrees greater than average. And since then it has been up and down.

What is more interesting is the extreme similarity amongst the graphs. I had to even check twice to make sure that the data was correct and that they were actually not graphing the same information. They weren’t, and what this means is that the temperature deviations year to year at different times at Macquarie Island stay relatively constant. In that, in a certain year if we were to experience an increase in 0.5 degrees at 3pm, then there is a reasonable chance that we would experience a similar increase at 3am and 9pm and noon etc.

This is very interesting, and we will dwell more on this in the future, by looking at season patterns. But what this means is that something is actually making the temperature change at a constant rate throughout the day and year. Of course, this something is not increasing the temperature however. All test on the data proved that there was no significant increase or decrease in temperature (midnight F = 0.87, p = 0.355; 3am F = 0.63, p = 0.43; 6am F= 0.47, p = 0.5; 9am F = 1.46, p = 0.23; noon F = 1.72, p = 0.09; 3pm F = 3.32, p = 0.75; 6pm F = 2.44, p = 0.13; 9pm F = 0.97, p = 0.33)

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