CONTROL ID: 1499859

TITLE: Estimation of Terrestrial COS Uptake From a Global Carbon Cycle Model (CLM-4.0)

AUTHORS (FIRST NAME, LAST NAME): Wenting Fu1, Robert E Dickinson1, Lianhong Gu2, Forrest M Hoffman2

INSTITUTIONS (ALL): 1. Geological Sciences, University of Texas at Austin, Austin, TX, United States.
2. Oak Ridge National Laboratory, Oak Ridge, TN, United States.

ABSTRACT BODY: Carbonyl sulfide (COS), an analog of carbon dioxide is a useful atmospheric tracer of carbon cycle processes. Previous studies have shown that the rate of COS uptake is closely related to the rate of gross primary production (GPP). Here, we implemented mechanistic and empirical descriptions of leaf and soil COS uptake into a global land model featuring carbon and nitrogen interactions, the Community Land Model version 4 model, and obtained new COS flux estimates based on physiological and environmental conditions in the model. Also, using a simulation experiment, we demonstrated that some ecosystem variables, such as LRU (Leaf Relative Uptake) and ERU (Ecosystem Relative Uptake), could provide additional constraints on responses of photosynthesis and respiration to environmental forcings. The ERU calculated from CLM4.0 shows regional and seasonal differences in the balance of ecosystem respiration (RECO) and GPP, and atmospheric measurements of ERU should reflect this variation. Understanding these ecosystem variables is essential for improving predictions of future responses of the terrestrial biosphere to changing environmental conditions.

KEYWORDS: [0414] BIOGEOSCIENCES / Biogeochemical cycles, processes, and modeling, [0315] ATMOSPHERIC COMPOSITION AND STRUCTURE / Biosphere/atmosphere interactions, [0428] BIOGEOSCIENCES / Carbon cycling, [0317] ATMOSPHERIC COMPOSITION AND STRUCTURE / Chemical kinetic and photochemical properties.
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