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Climate sensitivity to tropical land surface changes with coupled versus prescribed SSTs

机译：结合规定的SST与气候对热带陆地表面变化的敏感性

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Tropical land cover change experiments with fixed sea-surface temperatures (SSTs) and with an interactive ocean are compared to assess the relevance of including the ocean system in sensitivity studies to land surface conditions. The results show that the local response to deforestation is similar with fixed and simulated SSTs. Over Amazonia, all experiments simulate a comparable decrease in precipitation and no change in moisture convergence, implying that there is only a change in local water recycling. Over Africa, the impact on precipitation is not identical for all experiments; however, the signal is smaller than over Amazonia and simulations of more than 50 years would be necessary to statistically discriminate the precipitation change. We observe small but significant changes in SSTs in the coupled simulation in the tropical oceans surrounding the deforested regions. Impacts on mid and high latitudes SSTs are also possible. As remote impacts to deforestation are weak, it has not been possible to establish possible oceanic feedbacks to the atmosphere. Overall, this study indicates that the oceanic feedback to land surface sensitivity studies is of second importance, and that the inclusion of the oceanic system will require ensembles of long climate simulations to properly take into account the low frequency variability of the ocean.
机译：比较了具有固定海表温度（SST）和具有互动海洋的热带土地覆盖变化实验，以评估将海洋系统包括在对陆地表面状况的敏感性研究中的相关性。结果表明，当地对森林砍伐的反应与固定和模拟的SST相似。在亚马逊地区，所有实验都模拟了降水量的可比下降，并且水分汇聚没有变化，这意味着当地的水循环只有变化。在整个非洲，并非所有实验都对降水产生影响。但是，该信号要比亚马逊地区的信号要小，并且需要进行50年以上的模拟才能从统计学上区分降水变化。我们在森林砍伐地区周围的热带海洋中，在耦合模拟中观察到了SST的微小但重要的变化。对中高纬度SST的影响也是可能的。由于对森林砍伐的远程影响微弱，因此不可能建立对大气的海洋反馈。总的来说，这项研究表明，海洋对陆地表面敏感性研究的反馈是第二重要的，包括海洋系统在内，将需要长期气候模拟的整合，以适当考虑海洋的低频变化。

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