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Evaluation of the Community Land Model simulated carbon and water fluxes against observations over ChinaFLUX sites
Li Zhang;  Jiafu Mao;  Xiaoying Shi;  Daniel Ricciuto;  Honglin He;  Peter Thornton;  Guirui Yu;  Pan Li;  Min Liu;  Xiaoli Ren;  Shijie Han;  Yingnian Li;  Junhua Yang, Yanbin Hao;  Huimin Wang
2016
发表期刊Agricultural and Forest Meteorology
卷号226–227页码:174-185
摘要

The Community Land Model (CLM) is an advanced process-based land surface model that simulates carbon, nitrogen, water vapor and energy exchanges between terrestrial ecosystems and the atmosphere at various spatial and temporal scales. We use observed carbon and water fluxes from five representative Chinese Terrestrial Ecosystem Flux Research Network (ChinaFLUX) eddy covariance tower sites to systematically evaluate the new version CLM4.5 and old version CLM4.0, and to generate insights that may inform future model developments. CLM4.5 underestimates the annual carbon sink at three forest sites and one alpine grassland site but overestimates the carbon sink of a semi-arid grassland site. The annual carbon sink underestimation for the deciduous-dominated forest site results from underestimated daytime carbon sequestration during summer and overestimated nighttime carbon emission during spring and autumn. Compared to CLM4.0, the bias of annual gross primary production (GPP) is reduced by 24% and 28% in CLM4.5 at two subtropical forest sites. However, CLM4.5 still presents a large positive bias in annual GPP. The improvement in net ecosystem exchange (NEE) is limited, although soil respiration bias decreases by 16%–43% at three forest sites. CLM4.5 simulates lower soil water content in the dry season than CLM4.0 at two grassland sites. Drier soils produce a significant drop in the leaf area index and in GPP and an increase in respiration for CLM4.5. The new fire parameterization approach in CLM4.5 causes excessive burning at the Changbaishan forest site, resulting in an unexpected underestimation of NEE, vegetation carbon, and soil organic carbon by 46%, 95%, and 87%, respectively. Overall, our study reveals significant improvements achieved by CLM4.5 compared to CLM4.0, and suggests further developments on the parameterization of seasonal GPP and respiration, which will require a more effective representation of seasonal water conditions and the partitioning of net radiation between sensible and heat fluxes.

关键词Community Land Model china Flux eddy Covariance carbon Flux
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/9628
专题环境地球化学国家重点实验室
作者单位1.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2.Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, USA
3.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
4.Shanghai Key Laboratory for Urban Ecology and Sustainability, East China Normal University, Shanghai 200062, China
5.Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
6.Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China
7.South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
8.University of Chinese Academy of Sciences, Beijing 100049,China
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GB/T 7714
Li Zhang;Jiafu Mao;Xiaoying Shi;Daniel Ricciuto;Honglin He;Peter Thornton;Guirui Yu;Pan Li;Min Liu;Xiaoli Ren;Shijie Han;Yingnian Li;Junhua Yang, Yanbin Hao;Huimin Wang. Evaluation of the Community Land Model simulated carbon and water fluxes against observations over ChinaFLUX sites[J]. Agricultural and Forest Meteorology,2016,226–227:174-185.
APA Li Zhang;Jiafu Mao;Xiaoying Shi;Daniel Ricciuto;Honglin He;Peter Thornton;Guirui Yu;Pan Li;Min Liu;Xiaoli Ren;Shijie Han;Yingnian Li;Junhua Yang, Yanbin Hao;Huimin Wang.(2016).Evaluation of the Community Land Model simulated carbon and water fluxes against observations over ChinaFLUX sites.Agricultural and Forest Meteorology,226–227,174-185.
MLA Li Zhang;Jiafu Mao;Xiaoying Shi;Daniel Ricciuto;Honglin He;Peter Thornton;Guirui Yu;Pan Li;Min Liu;Xiaoli Ren;Shijie Han;Yingnian Li;Junhua Yang, Yanbin Hao;Huimin Wang."Evaluation of the Community Land Model simulated carbon and water fluxes against observations over ChinaFLUX sites".Agricultural and Forest Meteorology 226–227(2016):174-185.
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