Publication Date:
2017-08-04
Description:
An integrated evaluation of monthly mean land surface energy fluxes over China in seven reanalysis land model products during the period 1979–2015 is conducted. Observations from seven field sites are used to evaluate these flux products, including four reanalysis datasets and three produced by off-line land surface models. In general, the expected seasonal variations and spatial patterns in major climatic regimes are well reproduced by all reanalysis and modeling products. However, large differences among the four reanalysis products are found, while the three off-line land surface modeling products correlate well with each other. Looking at the Bowen ratio, it is found that the off-line land surface models convert a larger fraction of surface available energy into sensible heat flux compared to the reanalysis products in all climatic regimes. There are three centers of high inter-annual variability in sensible heat located in West China, Northeast China, and the eastern Inner Mongolia, respectively. In addition, the sensible heat flux agrees better with observations at grassland sites than at forest sites while the latent heat flux (LE) and net radiation (Rn) are significantly overestimated at forest sites in all the flux products. Besides, mean square errors of the fluxes are decomposed into biases, correlations and differences in standard deviation. Finally, based on a ranking system adopted to quantitatively evaluate the performance of each dataset, it is found that the surface energy fluxes in ERA-Interim and JRA-25 agree well with observations and the ensemble mean of all these products remains reasonably realistic as well.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics
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