We are just 38 days into 2019 and already we have had record heat in Australia, Chile and Brazil, record cold in the US, Canada and Russia, record snowfall in the US and record rain in the US and Australia and now NASA claims the last 5 years have been the warmest since modern records began and last year was the 4th warmest.
Can we ignore the figures anymore?
Earth's global surface temperatures in 2018 were the fourth warmest since 1880, according to independent analyses by NASA and the National Oceanic and Atmospheric Administration (NOAA).
Global temperatures in 2018 were 1.5 degrees Fahrenheit (0.83 degrees Celsius) warmer than 1951 to 1980 mean, according to scientists at NASA’s Goddard Institute for Space Studies (GISS) in New York.
Globally, 2018's temperatures rank behind those of 2016, 2017 and 2015. The past five years are, collectively, the warmest years in the modern record.
“2018 is yet again an extremely warm year on top of a long-term global warming trend,” said GISS Director Gavin Schmidt.
Since the 1880s, the average global surface temperature has risen about 2 degrees Fahrenheit (1 degree Celsius).
This warming has been driven in large part by increased emissions into the atmosphere of carbon dioxide and other greenhouse gases caused by human activities, according to Schmidt.
Weather dynamics often affect regional temperatures, so not every region on Earth experienced similar amounts of warming.
NOAA found the 2018 annual mean temperature for the contiguous 48 United States was the 14th warmest on record.
Warming trends are strongest in the Arctic region, where 2018 saw the continued loss of sea ice.
In addition, mass loss from the Greenland and Antarctic ice sheets continued to contribute to sea level rise.
Increasing temperatures can also contribute to longer fire seasons and some extreme weather events, according to Schmidt.
“The impacts of long-term global warming are already being felt — in coastal flooding, heat waves, intense precipitation and ecosystem change,” said Schmidt.
NASA’s temperature analyses incorporate surface temperature measurements from 6,300 weather stations, ship- and buoy-based observations of sea surface temperatures, and temperature measurements from Antarctic research stations.
Credits: NASA’s Earth Observatory
These raw measurements are analyzed using an algorithm that considers the varied spacing of temperature stations around the globe and urban heat island effects that could skew the conclusions.
These calculations produce the global average temperature deviations from the baseline period from 1951 to 1980.
Because weather station locations and measurement practices change over time, the interpretation of specific year-to-year global mean temperature differences has some uncertainties.
Taking this into account, NASA estimates that 2018’s global mean change is accurate to within 0.1 degrees Fahrenheit, with a 95 per cent certainty level.
NOAA scientists used much of the same raw temperature data, but with a different baseline period and different interpolation into the Earth’s polar and other data-poor regions.
NOAA’s analysis found 2018 global temperatures were 1.42 degrees Fahrenheit (0.79 degrees Celsius) above the 20th-century average.
For more information about NASA’s Earth science missions, visit: https://www.nasa.gov/earth
The slides for the Feb. 6 news conference are available at: https://www.nasa.gov/sites/default/files/atoms/files/noaa-nasa_global_analysis-2018-final_feb6.pdfNOAA’s Global Report is available at
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