Understanding Climate Risk

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Archive for January 7th, 2014

BoM Annual Climate Statement 2013 – SWWA SST

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As a result of the statement I made regarding the BoM Annual Climate Statement 2013, I was asked to do a radio interview on ABC drivetime radio in WA, so had a close look at the WA numbers to provide some local background. Average temperature was 0.98°C warmer than the 1961-90 average, the next highest being +0.93°C in 1998. Maximum temperature was also the warmest at +1.11°C compared to +1.00°C in 1994. Minimum temperature was not quite the warmest on record.

But the big shock I got was when I looked at sea surface temperatures (SSTs) for south-west WA. Have a look at this graph (note that 2013 isn’t up there yet due to a delay in processing):

Sea Surface Temperature anomalies south-west WA 1900-2012
Sea Surface Temperature anomalies south-west WA 1900-2012 (Source: BoM)

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BoM Annual Climate Statement 2013 – quick links

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On Friday Jan 3, the Australian Bureau of Meteorology released its Annual climate statement 2013. The headline statements include:

Data collected and analysed by the Bureau of Meteorology show that 2013 was Australia’s warmest year on record while rainfall was slightly below average nationally.

  • Summer 2012–13 was the warmest on record nationally, spring was also the warmest on record and winter the third warmest
  • Overall, 2013 was Australia’s warmest year on record: annual national mean temperature was +1.20°C above average
  • All States and the Northern Territory ranked in the four warmest years on record
  • Nationally-averaged rainfall was slightly below average for the year, with 428 mm (1961–1990 average 465 mm)
  • Rainfall was mostly below average for the inland east and centre, and above average for the east coast, northern Tasmania and parts of Western Australia

The statement was widely reported – two good summaries by the BoM crew and Lewis and Karoly can be found on The Conversation. One of the biggest talking points was that 2013 was a normal year meteorologically – no El Niño in sight – but the temperature was still a record. Much of the reporting in Australia pointed out the disjuncture between observations and current government policy. The Australian Science Media Centre also had a rapid round-up that included some words from me.

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