While land
surface observations go back hundreds of years in a few places, data of sufficient coverage for estimating global temperature have been available only since the end of the 19th century.
Not exact matches
Surface temperature
observations become sparser
going back further in time, however, and the most widely used datasets only
go back to 1880 or 1850.
This is crucial as this is all we are
going to get for exo - earths: we will not be able to build large enough telescopes to take detailed images of the
surfaces of exoplanets — but we will still be able to learn about their atmospheres (and
surfaces) from time - resolved
observations!
We're seeing a lot of energy both with atmospheric
observations and new
observations of the land's
surface and I hope we're
going to continue to see progress.
If you have seen Mr. Leigh's work in Happy -
Go - Lucky or Vera Drake, you understand that his films can be simplistic on the
surface, while carrying multiple layers of commentary and
observations.
His world is made up of hard evidence and uncontestable facts, his
observations and conclusions unsullied by personal feelings, until novelist Cullin
goes behind the cold, unsentimental
surface to reveal for the first time the inner world of an obsessively private man.
The
observation, which connects Arctic stratospheric ozone and variation in winds and sea -
surface temperatures in the tropics, could help forecasters better understand what's
going on.
As others have noted, the IPCC Team has
gone absolutely feral about Salby's research and the most recent paper by Dr Roy Spencer, at the University of Alabama (On the Misdiagnosis of
Surface Temperature Feedbacks from Variations in Earth's Radiant Energy Balance), for one simple reason: both are based on empirical, undoctored satellite
observations, which, depending on the measure required, now extend into the past by up to 32 years, i.e. long enough to begin evaluating real climate trends; whereas much of the Team's science in AR4 (2007) is based on primitive climate models generated from primitive and potentially unreliable land measurements and proxies, which have been «filtered» to achieve certain artificial realities (There are other more scathing descriptions of this process I won't use).
According to NOAA's 2012 Arctic Report Card, the duration of melting at the
surface of the ice sheet in summer 2012 was the longest since satellite
observations began in 1979, and the total amount of summer melting was nearly double the previous record, set in 2010 (satellite records of melting
go back to 1979.)
I would assume that all that happens is that the transport of heat is changed in the model: if
surface air temps in the model are too high compared to
observations, more heat is made to
go down into the ocean, and vice versa.
In the lower atmosphere, the available data points to increasing water vapor content, but because of large variations in local humidity from day to night, from day to day, and from season to season, no - one currently knows exactly how much more water vapor is
going into the air (IPCC Working Group 1 Assessment Report 4, Chapter 3, «
Observations:
Surface and Atmospheric Climate Change», page 273).
The ULab approach advocates resisting the strong temptation to move immediately to solutions based on
surface level
observations but to take time instead to
go deeper, to explore the underlying root causes and to gain understanding and empathy for the experience of human beings who participate in the system.