Vegetation physiological parameter setting in the Simple Biosphere model 2 (SiB2) for alpine meadows in the upper reaches of Heihe river

Yuan Li, Rui Sun, ShaoMin Liu

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3 Citations (Scopus)

Abstract

Land surface process modeling of high and cold area with vegetation cover has not yielded satisfactory results in previous applications. In this study, land surface energy budget is simulated using a land surface model for the A’rou meadow in the upper-reach area of the Heihe River Basin in the eastern Tibetan Plateau. The model performance is evaluated using the in-situ observations and remotely sensed data. Sensible and soil heat fluxes are overestimated while latent heat flux is underestimated when the default parameter setting is used. By analyzing physical and physiological processes and the sensitivities of key parameters, the inappropriate default setting of optimum growth and inhibition temperatures is identified as an important reason for the bias. The average daytime temperature during the period of fastest vegetation growth (June and July) is adopted as the optimum growth temperature, and the inhibition temperatures were adjusted using the same increment as the optimum temperature based on the temperature acclimation. These adjustments significantly reduced the biases in sensible, latent, and soil heat
fluxes.
Original languageEnglish
Pages (from-to)755 - 769
Number of pages15
JournalScience China Earth Sciences
Volume58
Issue number5
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • SiB2
  • Land surface process
  • Alpine meadow
  • Heihe river basin
  • Tibetan plateau

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