Global analyses of sea surface temperature, sea ice, and
night marine air temperature since the late nineteenth century.
The methodology and utilization of
night marine air temperatures to adjust ship and buoy temperature data;
«Adjustments are largely to sea surface temperatures (SST) and appear to align ship measurements of SST with
night marine air temperature (NMAT) estimates, which have their own data bias problems.
So rather than having a true Tavg
the night marine air temp is really a proxy for Tmin.
Rayner, N. A.; Parker, D. E.; Horton, E. B.; Folland, C. K.; Alexander, L. V.; Rowell, D. P.; Kent, E. C.; Kaplan, A. (2003) Global analyses of sea surface temperature, sea ice, and
night marine air temperature since the late nineteenth century J. Geophys.
By using
night marine air temperatures to normalize all sea data Huang effectively transferred the tas tend to tos for ERSSTv4 (NOAA's ocean temp index used by GISTEMP).
Ron, «By using
night marine air temperatures to normalize all sea data Huang effectively transferred the tas tend to tos for ERSSTv4» No, it doesn't have that effect.
Global Analysis of Sea Surface Temperature, Sea Ice, and
Night Marine Air Temperature Since the Late Nineteenth Century.
One of the new adjustments we are applying is extending the corrections to ship data, based on information derived from
night marine air temperatures, up to the present (we had previously stopped in the 1940s).
[4] Folland et al., 2002 defined an index to describe the Interdecadal Pacific oscillation (IPO) with sea surface temperature and
night marine air temperature to determine how the SPCZ varies with the IPO.
Not exact matches
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This offset was large and dramatic and was identified more than ten years ago from comparisons of simultaneous measurements of
night - time
marine air temperatures (NMAT) which did not show such a shift.
For example, climate researchers use only
night - time
marine air temperatures, as day - time records are too erratic.Changes in the local environment may also introduce erroneous trends.
Nick, I understand that
marine air temp is taken at
night to avoid radiant day heat reflecting from the ship, but there was not much information I could find to see if the time of observation had a protocol and whether it was consistently followed.
Night time
marine air temp NMAT is effectively a proxy for tas Tmin, not Tavg.
Cowtan et al (2015) accept that the new NOAA data set «incorporates adjustments to SSTs to match
night - time
marine air temperatures and so may be more comparable to model
air temperatures».
«
Night - time
marine air temperature measurements made during the war are believed to have been made indoors owing to the dangers of carrying a light on deck to read the thermometer after dark (Folland and Parker [1995]-RRB-.