An Assessment of the Quality of Surface Sensible Heat Flux Derived from Reanalysis Data through Comparison with Station Observations in Northwest China |
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| Authors: | ZHOU Lian-Tong and HUANG Ronghui |
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| Institution: | Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190,Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Abstract: | The present study compares seasonal and interdecadal variations in surface
sensible heat flux over Northwest China between station observations and
ERA-40 and NCEP-NCAR reanalysis data for the period 1960--2000. While the
seasonal variation in sensible heat flux is found to be consistent between
station observations and the two reanalysis datasets, both land-air
temperatures difference and surface wind speed show remarkable systematic
differences. The sensible heat flux displays obvious interdecadal
variability that is season-dependent. In the ERA-40 data, the sensible heat
flux in spring, fall, and winter shows interdecadal variations that are
similar to observations. In the NCEP-NCAR reanalysis data, sensible heat
flux variations are inconsistent with and sometimes even opposite to
observations. While surface wind speeds from the NCEP-NCAR reanalysis data
show interdecadal changes consistent with station observations, variations
in land-air temperature difference differ greatly from the observed dataset.
In terms of land-air temperature difference and surface wind speed, almost
no consistency with observations can be identified in the ERA-40 data, apart
from the land-air temperature difference in fall and winter. These inconsistencies
pose a major obstacle to the application in climate studies of surface
sensible heat flux derived from reanalysis data. |
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| Keywords: | sensible heat flux land-air temperature difference surface wind speed |
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