Evaluation of the Community Land Model simulated carbon and water fluxes against observations over ChinaFLUX sites
文献类型：SCI/SSCI论文
| 作者 | Zhang L.; Mao, J. F.; Shi, X. Y.; Ricciuto, D.; He, H. L.; Thornton, P.; Yu, G. R.; Li, P.; Liu, M.; Ren, X. L. |
| 发表日期 | 2016 |
| 关键词 | Community land model ChinaFLUX Eddy covariance Carbon flux air co2 enrichment global vegetation models leymus-chinensis steppe net ecosystem exchange earth system models cycle feedbacks forest ecosystems use efficiency coniferous plantation uncertainty analysis |
| 英文摘要 | 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. (C) 2016 Elsevier B.V. All rights reserved. |
| 出处 | Agricultural and Forest Meteorology |
| 卷 | 226 |
| 页 | 174-185 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0168-1923 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43914]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_生态网络实验室 |
| 推荐引用方式 GB/T 7714 | Zhang L.,Mao, J. F.,Shi, X. Y.,et al. Evaluation of the Community Land Model simulated carbon and water fluxes against observations over ChinaFLUX sites. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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