Impacts of shifting phenology on boundary layer dynamics in North America in the CESM
Impacts of shifting phenology on boundary layer dynamics in North America in the CESM
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DOI：
10.1016/j.agrformet.2022.109286
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发表时间：
2023-03
影响因子：
6.2
通讯作者：
Xiaolu Li;T. Ault;A. Richardson;C. Carrillo;D. Lawrence;D. Lombardozzi;S. Frolking;D. A. Herrera;M. Moon
中科院分区：
文献类型：
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作者：
Xiaolu Li;T. Ault;A. Richardson;C. Carrillo;D. Lawrence;D. Lombardozzi;S. Frolking;D. A. Herrera;M. Moon
植物物候调节生物圈和大气之间的水分和能量交换，从而影响行星边界层（PBL）动力学。在这里，我们使用社区地球系统模型第2版进行建模实验，在控制实验中，根据卫星气候学规定植物物候。然后，我们将北美植被变绿和衰老的时间提前和推迟一个月，并研究物候变化如何影响陆地-大气相互作用。改变植物物候通过对蒸散量和吸收太阳辐射的直接影响以及通过低云率变化的间接影响来改变边界层通量。规定的转变，物候有显着的，但不同的影响PBL动态和陆气耦合在春季和秋季在大平原和美国东部。在春季，植物物候提前显着降低PBL的高度在大平原超过100米。在秋季，大平原经历了显着增加PBL高度超过100米，在初秋，而美国东部表现出显着增加，在晚秋时，规定的衰老转移较早。在大平原和美国东部的季节性时间尺度上，由于植物物候的变化可以引起PBL条件的显着变化，我们的实验可以帮助推断潜在的位置和物候引起的变化的幅度，并提供有用的信息，基于观测的分析和模型评估。
Plant phenology modulates water and energy exchanges between the biosphere and the atmosphere and therefore influences planetary boundary layer (PBL) dynamics. Here we conduct a modeling experiment using the Community Earth System Model version 2, where plant phenology is prescribed based on satellite climatology in the control experiment. We then shift the timing of vegetation green-up and senescence in North America by one month earlier and later and investigate how shifting phenology could influence land-atmosphere interactions. Altering plant phenology modifies boundary layer fluxes through both direct influences on evapotranspiration and absorbed solar radiation and indirect effects through changes in low cloud fraction. The prescribed shift in phenology has significant but different influences on PBL dynamics and land-atmosphere coupling in the spring and fall in the Great Plains and Eastern United States. In the spring, earlier plant phenology significantly decreases PBL height in the Great Plains by more than 100 m. In the autumn, the Great Plains experience a significant increase in PBL height of over 100 m in the early fall while Eastern US exhibits a significant increase in the late fall when prescribed senescence is shifted earlier. As shifts in plant phenology alone can cause significant changes in PBL conditions at the seasonal timescale in the Great Plains and Eastern US, our experiments can help infer the potential location and magnitude of phenology-induced changes and provide useful information for observation-based analysis and model evaluation.