报告题目：植被与气候：生物物理反馈如何调节气候极端事件？

报告时间：9月5日15:30-17:30

报告地点：地理资源所A901

报 告 人：Diego Miralles 教授

报告人简介

Diego Miralles 教授，2017年以来担任比利时根特大学水文与气候学教授，曾任职于英国、荷兰和美国。他的研究方向包括生态水文、陆-气相互作用、全球水文学、水文气候极值和遥感水文。他目前领导水文与气候团队，致力于理解水圈、生物圈和气候之间的相互作用及其对当前和未来社会的影响。他是欧洲研究委员会（ERC）Starting and Consolidator基金获得者，Clarivate全球高被引科学家。

摘要：Land conditions, and vegetation in particular, play a fundamental role in shaping Earth's energy, water, and carbon cycles. Vegetation consumes significant water resources through transpiration and interception, regulates atmospheric CO2 concentration, alters surface roughness, and determines both net radiation and its partitioning. This influence propagates through the atmosphere, from micro-climate scales to the atmospheric boundary layer, subsequently impacting meso-scale and large-scale circulation, as well as the planetary transport of heat and moisture. Understanding the feedbacks between land and atmosphere across scales is crucial for predicting hydro-climatic extremes, such as droughts or heatwaves. It is believed that the compound occurrence of these events has been exacerbating in recent decades, partly due to the influence of climate change and land use on key land–atmosphere feedbacks that regulate them. While this finding is concerning, it also opens the door to improve (sub-)seasonal predictions and to leverage land geoengineering as a tool to mitigate extremes occurrence.

This presentation will explore the complex feedbacks between land and atmosphere,particularly focusing on extreme events like droughts and heatwaves,which cause direct societal impacts,agricultural loss,forest mortality,and water scarcity. Key questions will be addressed: How do extreme meteorological conditions impact ecosystem evaporation?In what ways does vegetation regulate the atmospheric boundary layer,affecting the intensification and propagation of these extremes?How do these biophysical feedbacks contribute to the inflow of heat and moisture to downwind regions,potentially leading to the propagation of extreme events?What are the consequences of land feedbacks for human heat stress during extreme events?How can information on land conditions be used for the timely prediction of these events?The goal of this presentation is not to provide definitive answers to these questions,but rather to present new results from my team’s work that may help advance our collective understanding of land feedbacks and the role they play in climate.