【來訪單位 Institution】：奧本大學，美國    Auburn University USA

【邀請人 Host】：戴民漢  Minhan Dai      【聯絡人 Contact】：黃迎   Ying Huang 2181571

Abstract:

Riverine carbon (C) export and GHG (CO₂, CH₄ and N₂O) emissions play important roles in the global GHG budgets, dynamics of continental shelf ecosystems and biosphere-climate feedback. Despite making up only 0.3% of the global area, rivers tightly connect two of the largest active C reservoirs on earth: terrestrial ecosystems and oceans. Natural and human-induced changes in the terrestrial C and nitrogen (N) cycles could greatly alter the magnitude and temporal patterns of terrestrial C and N exports to rivers, which would affect C and N dynamics of receiving freshwater and marine ecosystems, and exert a strong influence on the atmospheric radiation balance through the exchange of greenhouse gases. Therefore, it is essential to provide a robust estimate of riverine C fluxes and GHG emissions for a better understanding the global C and N cycles and the climate system. However, a reliable estimate of the riverine C and N exports and inland water GHG emissions is lacking. Process-based modeling of riverine C and N exports and GHG emission, which couples major biogeochemical and hydrological cycles, provides an alternative to empirical methods, that enables a more robust estimation of riverine GHG budgets and the response to changing climate and human disturbance. Here we used a process-based land-aquatic interface model, the Dynamic Land Ecosystem Model (DLEM), in conjunction with several sources of data, to quantify the magnitude and spatiotemporal patterns of riverine C export (DOC, TOC, DIC) from global land to coastal oceans and GHG emissions from global inland water systems. 

Bio：

田漢勤博士, 美國奧本大學索倫·瑪莎·狄克遜講席教授, 國際氣候與全球變化研究中心主任, 美國大學聯盟海洋-大氣-氣候理事會成員，全球碳計劃指導委員會委員, 全球碳計劃和國際氮計劃聯合項目首席,  曾任美國生態學會亞洲分會主席。長期致力于全球變化生態學, 生物地球化學及生態水文的研究。 運用生態糸統過程模型和生態大數據方法, 并結合地面觀測和衛星遙感技術, 理解和定量分析全球變化與生態系統的相互作用, 以及氣候變化與糧食安全、水安全關系, 并取得系統性的創新成果。在Nature 和 Science 等期刊發表論文300篇，被引用率萬余次。承擔主持了美國基金委等資助的30多項研究項目，累計獲得科研經費超過3000多萬美元, 其 研究成果成為IPCC及若干國家氣候變化評估的重要科學依據。榮獲首屆葉篤正全球變化科學獎, 哈里·墨菲 (Harry Murphy)卓越研究獎, 美國奧本大學最高學術創新成就獎, 美國東南大學聯盟學術成就獎, 安德魯·卡耐基智慧獎。入選美國科學促進會會士(AAAS Fellow)。