January-October 2010 Emerges as the Warmest Period in the Instrumental Record
November 27, 2010
According to a new report “State of the Climate – Global Analysis, October 2010” published by National Climatic Data Center (NCDC), National Oceanic and Atmospheric Administration (NOAA), http://www.ncdc.noaa.gov/sotc/?report=global the combined global land and ocean surface temperature for January–October 2010 was +0.63°C above the 20th century average of 14.1°C and tied with 1998 as the warmest January–October period on record (see Figure 1).
The data indicate mean temperature changes in the Arctic of up to +5oC relative to the 1961-1990 base period, leading to progressive loss of Greenland ice sheet and Arctic sea ice, which in October 2010 was 17% less than during October periods of 1979-2000.
Consistent with elevated radiative forcing by greenhouse gases in the atmosphere, leading to high temperatures, strong evaporation and abrupt precipitation events, 2010 has seen a string of extreme weather events, including heat waves and fires (Russia), severe droughts (Brazil, Mexico), cyclones (USA, Caribbean) and floods (Pakistan, western China, Australia) (see Figure 2).
That extreme weather events are increasing in frequency and intensity is shown in figure 3, showing the number of cyclones increased by a factor of about 2 and floods by a factor of about 3.
Mean global high temperatures persisted despite a prevalence of La-Nina conditions ( http://www.bom.gov.au/climate/enso/indices.shtml ;http://www.bom.gov.au/climate/enso/) which resulted in below-average temperatures across the equatorial Pacific).
Thanks to the surrounding oceans Australia has been mostly benign in terms of temperature. The decrease in mean temperatures in Australia (Figure 1) is related to the increased rainfall, clouding and evaporation/cooling effects. For Australia the year 2010 (to November) ranks in the top 10 for rainfall due to a confluence of seasonal drivers – ENSO and IOD.
Much of the rainfall occurred as abrupt precipitation events, less beneficial and often destructive as compared with gentler Mediterranean-type precipitation. A significant drying up continues in southwestern Australia, which had record low winter season rainfall, continuing a trend that began around the 1970s. This year SW WA had little inflows into its dams.
The rise in the frequency and intensity of extreme weather events around the world implies models suggesting gradual climate transitions, such as projected by the IPCC-2007 (http://www.ipcc.ch/), require revision in terms of the effects of tipping points, consistent with recent research ( http://www.pnas.org/content/105/6/1786.long, http://researchpages.net/ESMG/people/tim-lenton/tipping-points/).
According to a new report by the Global Carbon Project ( http://www.abc.net.au/am/content/2010/s3072556.htm) “the growth rate in emissions is going to make it increasingly difficult for us to constrain climate change to levels of around 2 degrees of warming above the pre-industrial temperatures.“ .
According to Professor Hans Joachim Schellnhuber, Director of the Potsdam Institute for Climate Impact Research, +2 degrees may result in tipping points ( http://universitypost.dk/article/two-degrees-warmer-may-be-past-tipping-point ).
Ignoring reports by the world’s major climate science organizations (NASA/GISS, NCDC, Hadley-Met, Potsdam, BOM, CSIRO), governments continue to consider the issue almost exclusively in economic $ terms, the ultimate Faustian bargain.
Most are oblivious to the calamitous consequences of inaction or of limited action falling short of arresting climate change. Current negotiations regarding climate mitigation ( http://www.google.com/hostednews/ap/article/ALeqM5hA3Nfc02CbfSH2Iz5aR9AmCJjt3g?docId=a530a26cc75a431281af216b743181f9 ) and debates regarding carbon tax versus CPRS schemes ( http://www.bloomberg.com/news/2010-11-16/australian-carbon-price-would-unlock-free-market-genius-gillard-writes.html ), ignore the implications of the rise in extreme weather events.
Extensive media cover-up, coupled with well funded climate denial campaigns ( http://www.guardian.co.uk/world/2010/oct/24/tea-party-climate-change-deniers/print , http://www.washingtonpost.com/wp-dyn/content/article/2010/11/18/AR2010111805451.html ), are on the rise. Emergency climate mitigation measures, including draw-down of atmospheric CO2 using soil biochar, chemical sequestration and extensive reforestation, may have a chance of slowing runaway global warming.
Temperature anomalies October 2010 with respect to October periods 1961-1990
Selected significant climate anomalies and events, October, 2010
Trends in climate disasters compared with earthquakes showing tripling of the
annual frequency of floods and doubling of frequency of cyclones.