Sentences with phrase «observational coverage»

Prior to 1979, there is very little evidence as to the actual effects of incomplete observational coverage, or of blending air and SST measurement, on estimated trends in global temperature.
This is usually done by evaluating climate model data only where and when observations are available, in order to mimic the observational system and avoid possible biases introduced by changing observational coverage.
The insufficient observational coverage has also been noted by the IPCC AR4 and by Gillett et al. (Nature Geoscience, 2008), who argue that the observed warming in the Arctic and Antarctic are not consistent with internal climate variability and natural forcings alone, but are directly attributable to increased GHG levels.
In land regions where observational coverage is sufficient for assessment, there is medium confidence that anthropogenic forcing has contributed to a global - scale intensification of heavy precipitation over the second half of the 20th century.»
Recently, a number of methods have been used to address the sparse observational coverage of West Antarctic climate, including analysis of remote sensing data, interpolation of data from the sparse station network, and merging of in situ records.
The infilling of HadCRUT4 by Cowtan and Way is prone to lesser error when using a 1930 — 50 base period rather than 1859 — 82 (or 1861 — 80 as in REA16), since observational coverage was less sparse during 1930 — 50.
It is doubtful that any method of global infilling of temperatures based on the limited observational coverage available in the second half of the 19th century or (to a decreasing extent) during the first half of the 20th century is very reliable.
The third paragraph states, «One source of bias - due to poor observational coverage - has been discussed in our recent paper, although it was reported back in 2009, and it was addressed by NASA as long ago as 1987.»
Agreement between ERA - Interim and JRA - 55 is particularly close over Europe, where observational coverage is good.
Would it be right to say, though, that this finding is not likely to make much difference for model - observation comparisons over the recent short - term period, because in such comparisons the models are masked by the observational coverage anyway?
«It's likely that due to the poor observational coverage, we just haven't been able to say definitively what the long - term rate of Southern Hemisphere ocean warming has been,» says Dr. Durack.
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