东亚是全球人口数量和密度最大的地区之一,解析该地区水文气候变化历史、过程、规律及其驱动机制不仅对区域工农业规划和生态文明建设至关重要,对研究亚洲夏季风穿时性、全新世气候适宜期和中国南北气候变化相位关系等经典科学问题亦具...东亚是全球人口数量和密度最大的地区之一,解析该地区水文气候变化历史、过程、规律及其驱动机制不仅对区域工农业规划和生态文明建设至关重要,对研究亚洲夏季风穿时性、全新世气候适宜期和中国南北气候变化相位关系等经典科学问题亦具有重要意义。传统观点认为轨道尺度亚洲夏季风降水变化趋势主要受控于北半球太阳辐射量的变化,呈现出较强的空间相似性。然而,在年代际尺度(Qian and Lin,2005)以及过去2000年的百年尺度,我国季风区南、北降雨变化都存在反相位的空间差异性(Tan et al,2018a)。亚洲季风降水空间格局在不同时间尺度的非一致性表现及其背后的驱动机制是深入理解亚洲季风动力学的重要抓手之一。展开更多
Characterization of transport pathways and depositional changes in Mercury(Hg)and their connection to climatic and environmental changes on various time scales are crucial for better understanding the anthropogenic im...Characterization of transport pathways and depositional changes in Mercury(Hg)and their connection to climatic and environmental changes on various time scales are crucial for better understanding the anthropogenic impacts on the global Hg cycle in the Anthropocene epoch.In this study,we examined Hg variations recorded in a stalagmite from central China,covering the period from 25.5 to 10.9 thousand years ago.Our data show a marked increase in Hg concentrations during the late Last Glacial Maximum,which coincided with the period of highest dust deposition on the Chinese Loess Plateau.Hg concentrations were lower during Heinrich events 1 and 2 and the Younger Dryas but higher during the BùllingAllerùd and the early Holocene.We suggest that regional dust load,which enhances atmospheric dry deposition of Hg,is the primary factor influencing Hg deposition in central China on glacialinterglacial timescales.On millennial-to-centennial timescales,climate also plays a significant role.Warmer and wetter conditions increase vegetation,litterfall,and soil/rock weathering,which in turn boost mineral dissolution and soil erosion in the vadose zone.These processes collectively result in higher Hg concentrations in the stalagmite.展开更多
文摘东亚是全球人口数量和密度最大的地区之一,解析该地区水文气候变化历史、过程、规律及其驱动机制不仅对区域工农业规划和生态文明建设至关重要,对研究亚洲夏季风穿时性、全新世气候适宜期和中国南北气候变化相位关系等经典科学问题亦具有重要意义。传统观点认为轨道尺度亚洲夏季风降水变化趋势主要受控于北半球太阳辐射量的变化,呈现出较强的空间相似性。然而,在年代际尺度(Qian and Lin,2005)以及过去2000年的百年尺度,我国季风区南、北降雨变化都存在反相位的空间差异性(Tan et al,2018a)。亚洲季风降水空间格局在不同时间尺度的非一致性表现及其背后的驱动机制是深入理解亚洲季风动力学的重要抓手之一。
基金supported by the National Natural Science Foundation of China(42325705 and 42230208)the Chinese Academy of Sciences(xbzg-zdsys-202217)。
文摘Characterization of transport pathways and depositional changes in Mercury(Hg)and their connection to climatic and environmental changes on various time scales are crucial for better understanding the anthropogenic impacts on the global Hg cycle in the Anthropocene epoch.In this study,we examined Hg variations recorded in a stalagmite from central China,covering the period from 25.5 to 10.9 thousand years ago.Our data show a marked increase in Hg concentrations during the late Last Glacial Maximum,which coincided with the period of highest dust deposition on the Chinese Loess Plateau.Hg concentrations were lower during Heinrich events 1 and 2 and the Younger Dryas but higher during the BùllingAllerùd and the early Holocene.We suggest that regional dust load,which enhances atmospheric dry deposition of Hg,is the primary factor influencing Hg deposition in central China on glacialinterglacial timescales.On millennial-to-centennial timescales,climate also plays a significant role.Warmer and wetter conditions increase vegetation,litterfall,and soil/rock weathering,which in turn boost mineral dissolution and soil erosion in the vadose zone.These processes collectively result in higher Hg concentrations in the stalagmite.
