Influence of dynamic vegetation on climate change arising from increasing CO2
Influence of dynamic vegetation on climate change arising from increasing CO2
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DOI：
10.1007/s00382-009-0611-y
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发表时间：
2009-07
期刊：
影响因子：
4.6
通讯作者：
Ryouta O’ishi;A. Abe‐Ouchi
中科院分区：
文献类型：
--
作者：
Ryouta O’ishi;A. Abe‐Ouchi
将动态全球植被模式(DGVM)与大气环流模式(AGCM)相耦合，研究了全球变暖条件下植被动态对气候变化的影响。在当前气候、当前潜在植被、当前净初级生产力(NPP)和工业化前的碳收支方面，模型结果与观测结果和以前的研究结果基本一致。为了评价植被动态变化的影响，利用DGVM-AGCM和当前固定植被的AGCM，比较了工业化前大气CO2值增加一倍和四倍的气候特征的平衡状态。我们还分离了温度、降水和CO2施肥量对植被变化的贡献。结果表明，由于动态植被的加入，全球变暖气候敏感性放大了10%。二氧化碳升高和气候变化的总体影响也导致全球净初级生产力和植被覆盖率的增加。与绿化相关的反照率的减少导致全球变暖加剧。我们的分离分析表明，温度改变了西伯利亚或阿拉斯加等高纬度地区的植被，那里有从冻土带到森林的转换。另一方面，在干旱/半干旱地区，CO2施肥对绿化的贡献最大。降水量的变化没有引起植被的剧烈变化。
A dynamic global vegetation model (DGVM) is coupled to an atmospheric general circulation model (AGCM) to investigate the influence of vegetation dynamics on climate change under conditions of global warming. The model results are largely in agreement with observations and the results of previous studies in terms of the present climate, present potential vegetation, present net primary productivity (NPP), and pre-industrial carbon budgets. The equilibrium state of climate properties are compared among pre-industrial, doubled, and quadrupled atmospheric CO2values using DGVM–AGCM and current AGCM with fixed vegetation to evaluate the influence of dynamic vegetation change. We also separated the contributions of temperature, precipitation and CO2fertilization on vegetation change. The results reveal an amplification of global warming climate sensitivity by 10% due to the inclusion of dynamic vegetation. The total effects of elevated CO2and climate change also lead to an increase in NPP and vegetation coverage globally. The reduction of albedo associated with this greening results in enhanced global warming. Our separation analysis indicates that temperature alters vegetation at high latitudes such as Siberia or Alaska, where there is a switch from tundra to forest. On the other hand, CO2fertilization provides the largest contribution to greening in arid/semi-arid region. Precipitation change did not cause any drastic vegetation shift.