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Global Warming Trend

January 13, 2011

Global Warming deniers should look at this plot depicting warming trends measured by four different institutes. Different agencies, independent measurements but the result remains the same– our earth is warming. 2010 has been declared to be the hottest year on record tied with 2005 by NASA GISS and NOAA. Japanese Meteorological Agency’s preliminary data shows that 2010 is the second hottest year. Absolute surface temperature is difficult to calculate, instead relative temperature is measured which is here referred to as temperature anomaly. Average temperature of a particular location is compared with average long term temperature (base temp) and the difference is termed as temperature anomaly. Different agencies use different base temperature, e.g. NASA GISS uses average temperature from 1951-1980 as the base temperature while Japanese Agency uses 1971-2000 as the base temperature. This may lead to some differences in the measurement by different agencies. Also, the way data is processed can lead to some differences in the temperature reported. This sometimes canlead to confusion in public as why the temperatures reported by different agencies are different and can give an impression that the temperatures reported are not accurate. If you look at the plot closely, you can see slight differences in the values, but the overall trend remains the same. Global temperatures are meaningful only when observed over a span of time rather than just for an year or two and you can clearly see the trend– the earth is warming.

Image and info credit: NASA Earth Observatory/Robert Simmon

Filed under: Environment,Research

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