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http://dx.doi.org/10.5532/KJAFM.2010.12.2.107

A Sensitivity Analysis of JULES Land Surface Model for Two Major Ecosystems in Korea: Influence of Biophysical Parameters on the Simulation of Gross Primary Productivity and Ecosystem Respiration  

Jang, Ji-Hyeon (Department of Atmospheric Sciences, Global Environment Laboratory, Yonsei University)
Hong, Jin-Kyu (National Institute for Mathematical Sciences)
Byun, Young-Hwa (Climate Research Lab, National Institute of Meteorological Research)
Kwon, Hyo-Jung (Department of Atmospheric Sciences, Global Environment Laboratory, Yonsei University)
Chae, Nam-Yi (Division of Polar Climate Research, Korea Polar Research Institute, KORDI)
Lim, Jong-Hwan (Department of Forest Conservation, Korea Forest Research Institute)
Kim, Joon (Department of Atmospheric Sciences, Global Environment Laboratory, Yonsei University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.12, no.2, 2010 , pp. 107-121 More about this Journal
Abstract
We conducted a sensitivity test of Joint UK Land Environment Simulator (JULES), in which the influence of biophysical parameters on the simulation of gross primary productivity (GPP) and ecosystem respiration (RE) was investigated for two typical ecosystems in Korea. For this test, we employed the whole-year observation of eddy-covariance fluxes measured in 2006 at two KoFlux sites: (1) a deciduous forest in complex terrain in Gwangneung and (2) a farmland with heterogeneous mosaic patches in Haenam. Our analysis showed that the simulated GPP was most sensitive to the maximum rate of RuBP carboxylation and leaf nitrogen concentration for both ecosystems. RE was sensitive to wood biomass parameter for the deciduous forest in Gwangneung. For the mixed farmland in Haenam, however, RE was most sensitive to the maximum rate of RuBP carboxylation and leaf nitrogen concentration like the simulated GPP. For both sites, the JULES model overestimated both GPP and RE when the default values of input parameters were adopted. Considering the fact that the leaf nitrogen concentration observed at the deciduous forest site was only about 60% of its default value, the significant portion of the model's overestimation can be attributed to such a discrepancy in the input parameters. Our finding demonstrates that the abovementioned key biophysical parameters of the two ecosystems should be evaluated carefully prior to any simulation and interpretation of ecosystem carbon exchange in Korea.
Keywords
JULES; gross primary production; ecosystem respiration; sensitivity analysis; forest; farmland;
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