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Global warming is a long-term trend with ups and downs along the way

GisTempAug

Many climate-change denialists don’t seem to understand that global warming is not a relentless phenomenon without any dips in the overall trend.

The chart above shows occasional short-term declines in global temperatures. But the long-term pattern of warming is unmistakable.

Consider THIS situation, for example:

Heat absorbed by the deep oceans has brought a slowing of global warming in the last five years, U.K. scientists say, but the long-term trend is still upward.

Oceans absorb large amounts of the Earth’s heat, a phenomenon that goes on over long periods as heat from the ocean surface is gradually circulated to the seas’ deeper regions, they said.

Global temperatures have remained largely static over the past five years, giving ammunition to climate change skeptics, but scientists said the evidence still clearly points to ongoing global warming in the coming decades as greenhouse gases in the atmosphere build up, The Guardian reported Monday.

Computer climate models show periods of slower warming were to be expected as part of the natural variation of the climate cycle and did not contradict predictions of ongoing global warming, Peter Stott of Britain’s Met Office said.

Despite the current slowdown, average temperatures are expected to reach more than 3 degrees Fahrenheit above pre-industrial levels by 2060, they said.

The current slowing of that warming would only delay reaching that point by five to 10 years, climate researcher Rowan Sutton at the National Center for Atmospheric Research at Reading University said.

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3 Comments

  1. Dan Pangburn

    CO2 increase from 1800 to 2001 was 89.5 ppmv (parts per million by volume). The atmospheric carbon dioxide level has now increased since 2001 by 25.59 ppmv (an amount equal to 28.6% of the increase that took place from 1800 to 2001) (1800, 281.6 ppmv; 2001, 371.13 ppmv; July, 2013, 396.72 ppmv).

    The average global temperature trend (5 reporting agencies) since 2001 is flat.

    That is the observation. Explain how the temperature increase to 2001 was caused by a CO2 increase of 89.5 ppmv but that 25.59 ppmv additional CO2 increase had no effect on the average global temperature trend after 2001.

  2. The author is very selective about what information and scientists he is willing to listen to. The temperature has continued to drop. The lack of understanding of the radiative force from the CO2-H2O nexus and how it distributes through convection and weather is now falsifying these deeply-held beliefs. Consider that the sun was in a Grand Maxima for the entire 20th century, and ask yourself what part of that had nothing to do with the small rise in temperature?

  3. Jeff Patterson

    There is no scientific basis for the claim that “Heat absorbed by the deep oceans has brought a slowing of global warming in the last five years” or that “the long-term trend is still upward.” The ocean has been warming since we exited the Little Ice Age. Warmer waters increase the out-gassing of CO2 and all agree that this natural phenomena is responsible for most of the observed increase in atmospheric CO2 (which always lags the temperature increase). There is simply no way to detect a human signature in the deep ocean temperature data which only spans a decade.

    Another point of note is that this convenient “the heat’s hiding in the ocean” hypothesis was not predicted by the the GCM’s that the Warmists have been using to generate the hysteria required to achieve their political agenda. If the GCMs cannot accurately model ocean heat uptake and it’s associated effect on global temperatures, why should we believe they have any skill in predicting the future?

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