longweekend58 wrote on Mar 1
st, 2013 at 3:50pm:
ONE above average temperature summer is proof of ACC but the 3 previous years of BELOW average temperatures proved...
that climate science cherry picks data.
Thats pretty rich longy. you are cherry picking your own data there. Six of the hottest ten summers on record have occurred this century, and only two occurred before 1990.
Quote:When it comes to averages over time, January 2013 was the hottest month recorded in the entire observational record for Australia, stretching back to 1910 (the first year for which we can confidently estimate national temperatures).
And as of yesterday, a new record was added to the books. The summer of 2012-13 was Australia’s hottest on record. In fact, the entire six months — from September 2012 to February 2013 — were warmer than the previous high for that period, set in 2006-2007.
And there was no el nino to boost the temperature
Quote:Indeed, an interesting feature of the heat this summer is that it occurred during a “neutral” period in the El Niño-Southern Oscillation (that is, it was neither La Niña nor El Niño). Up until this year, six of the eight warmest summers, and the hottest three summers on record, occurred during El Niño years.
This essentially means that the record was consistent with warming trends, and achieved without an extra push from natural variability associated with El Niño.
But was this just a localised event in Australia?
Quote:Many parts of southern Africa had their hottest January on record, while the month was also much hotter than normal in large parts of Argentina, Chile and Brazil. In parts of Patagonia, January temperatures were more than 4°C above normal.
A particularly extreme example was the summer of 2010 in western Russia, in which seasonal temperatures exceeded previous records by 2°C or more.
The United States, especially its southern and central areas, has also had two very hot summers in a row in the last two years, which have contributed to 2012 being that nation’s hottest year on record by a large margin.
So is this just land based warming?
Quote:The oceans surrounding Australia have also been exceptionally warm. January 2013 was the second warmest on record, following an unusually hot 2012, and a record hot 2011 for Australian-region sea surface temperatures.
But there has been no warming for 17 years right?
Quote:Six of Australia’s ten hottest summers on record have come in the last 11 years, meaning that very hot summers have been occurring at about five times the rate you would expect without a warming trend.
In the last decade, record high temperatures have outnumbered record low temperatures in Australia by a ratio of about three to one. About a third of the all-time record high temperatures at the Bureau’s long-term stations have occurred since 2000.
The latest global analyses have found that extreme high temperatures are increasing in frequency almost throughout the world, and the Australian results are consistent with that picture.
Another indicator of the trend towards extreme warmth in Australia is the proportion of the continent which has a summer amongst the ten warmest in history.
The summer of 2012-13 may have set a record in this respect, but several other recent years have also had a large area of the country where summer has been much warmer than usual. On average, since 2000, about 25% of the continent each year has had a summer in the ten warmest. The chances of such a warm summer in any given place in the post-2000 period are about three times what they were pre-2000.
http://www.sbs.com.au/news/article/1742160/Hottest-Australian-summer-on-record-BoM