Ten indicators that the world is warming: NOAA report

Posted on July 28, 2010


The IPCC conclusion (Alley et al. 2007) that “warming of the climate system is unequivocal” does not rest solely upon [land surface air temperature] records.  These constitute only one line of evidence among many, for example: uptake of heat by the oceans, melting of land ice such as glaciers, the associated rise in sea level, and increased atmospheric surface humidity… If the land surface records were systematically flawed and the globe had not really warmed, then it would be almost impossible to explain the concurrent changes in this wide range of indicators produced by many independent groups. The observed changes in a broad range of indicators provide a self-consistent story of a warming world.

— NOAA, State of the Climate in 2009

10 measurable planet-wide features which reflect global temperature changes

The following seven indicators are on the rise:

  • air temperature over land
  • sea-surface temperature
  • air temperature over oceans
  • sea level
  • ocean heat
  • humidity
  • tropospheric temperature

The following three indicators are  in decline:

  • Arctic sea ice
  • glaciers
  • spring snow cover in the Northern hemisphere


Source:  National Oceanic & Atmospheric Administration Annual State of the Climate Report 2009 (Released July 28, 1010)




Posted in: climate change