Friday, August 17, 2007
Beautiful Cape Otway
Ahh, Cape Otway. Such a beautiful place, and the cape otway lighthouse, the most significant lighthouse in Australia, is home to our next piece of analysis:
Maximum temperatures have shown a significant increase in temperature since records first begun here in 1910, despite no real increase since the 60s. Minimum temperatures do not show a significant increase, although they do when analysing from world war 2 onwards. The last decade have been seen constantly warmer minimums.
Unfortunately our time based data is not fantastic, with Midnight, 3am, 6am, Noon, 6pm and 9pm all having limited data. But 9am times actually show a significant decrease. On observation of the graph this is largely due to very hot temperatures (and somewhat dubious) pre 1920. Since then no real pattern has emerged. Given the large increase in maximum temperatures, we would expect 3pm temperatures to also increase, but this was not so.
So is there much we can talk about this wonderful place? Well yes, despite a small sample size, when looking at minimum temperature anomalies vs 3am and 6am, we see that minimum anomalies are up to half a degree warmer, which once again indicates that the minimum temperature is warming up at a greater rate than overnight temperatures. Once again indicating that the minimum is a poor measure of overnight climate.