Terrestrial vegetation and water balance - hydrological evaluation of a dynamic global vegetation model
Terrestrial vegetation and water balance - hydrological evaluation of a dynamic global vegetation model
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DOI：
10.1016/j.jhydrol.2003.09.029
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发表时间：
2004-01-30
影响因子：
6.4
通讯作者：
Sitch, S
中科院分区：
文献类型：
--
作者：
Gerten, D;Schaphoff, S;Sitch, S
地球上的植被在全球水平衡中起着关键作用。因此，有必要模拟陆地生物圈和水循环之间的动态相互作用和反馈。在这里，水文性能的Lund-Potsdam-Jena模型（LPJ），一个突出的动态全球植被模型，进行了评估。这种类型的模型模拟耦合的陆地碳和水循环，因此，它们非常适合于调查大域的生物圈-水圈的相互作用。我们表明，径流和蒸散计算LPJ同意各自的结果，从国家的最先进的全球水文模型，而在某些地区，径流显着超过或低估相比，观测。这些偏差的方向和幅度在很大程度上与其他宏观尺度模型相似，而不是特定于LPJ。这主要归因于气候输入数据的不确定性，以及模型未考虑到的人类干预（如取水、土地覆盖物转换）。需要开发更多的模型，对生物圈、水圈和生物圈之间的水交换进行综合评估。然而，LPJ模型现在可用于研究世界主要植被类型与陆地水平衡之间的相互关系。作为一个例子，它表明，增加一倍的大气CO2含量将导致显着的变化，蒸散和径流在世界许多地区。这些变化虽然很大，但独立的水文模型仍然看不到，因此强调了模拟碳和水的耦合循环的重要性。(C)2003 Elsevier B. V.保留所有权利。
Earth's vegetation plays a pivotal role in the global water balance. Hence, there is a need to model dynamic interactions and feedbacks between the terrestrial biosphere and the water cycle. Here, the hydrological performance of the Lund-Potsdam-Jena model (LPJ), a prominent dynamic global vegetation model, is evaluated. Models of this type simulate the coupled terrestrial carbon and water cycle, thus they are well suited for investigating biosphere-hydrosphere interactions over large domains. We demonstrate that runoff and evapotranspiration computed by LPJ agree well with respective results from state-of-the-art global hydrological models, while in some regions, runoff is significantly over- or underestimated compared to observations. The direction and magnitude of these biases is largely similar to those from other macro-scale models, rather than specific to LPJ. They are attributable primarily to uncertainties in the climate input data, and to human interventions not considered by the model (e.g. water withdrawal, land cover conversions). Additional model development is required to perform integrated assessments of water exchanges among the biosphere, the hydrosphere, and the anthroposphere. Yet, the LPJ model can now be used to study inter-relations between the world's major vegetation types and the terrestrial water balance. As an example, it is shown that a doubling of atmospheric CO2 content alone would result in pronounced changes in evapotranspiration and runoff for many parts of the world. Although significant, these changes would remain unseen by stand-alone hydrological models, thereby emphasizing the importance of simulating the coupled carbon and water cycle. (C) 2003 Elsevier B.V. All rights reserved.