日本地球惑星科学連合2022年大会

講演情報

[E] 口頭発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS01] Environmental, Socio-Economic and Climatic Changes in Northern Eurasia

2022年5月26日(木) 10:45 〜 12:15 106 (幕張メッセ国際会議場)

コンビーナ:Pavel Groisman(NC State University Research Scholar at NOAA National Centers for Environmental Information, Asheville, North Carolina, USA)、コンビーナ:Maksyutov Shamil(National Institute for Environmental Studies)、Streletskiy Dmitry A(George Washington University)、コンビーナ:Kukavskaya Elena(V.N. Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences - separate subdivision of the FRC KSC SB RAS)、座長:Groisman Pavel(NC State University Research Scholar at NOAA National Centers for Environmental Information, Asheville, North Carolina, USA)、Elena Kukavskaya(V.N. Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences - separate subdivision of the FRC KSC SB RAS)、Dmitry A Streletskiy(George Washington University)

11:45 〜 12:00

[MIS01-11] Albedo-induced global warming potentials in context of greenhouse gases in grasslands of East Asia

*XIANGLAN LI1、Jiquan Chen2,3、Qingsong Zhu1、Huimin Zou1、Yunhao Dai1 (1.College of Global Change and Earth System Sciences, Beijing Normal University、2.Department of Geography, Environment & Spatial Sciences, Michigan State University, East Lansing, MI 48824, USA、3.Center for Global Change and Earth Observations, Michigan State University, East Lansing, MI 48823, USA)

キーワード:Albedo, Greenhouse gases, grassland, East Asia, human activities, natural disturbances

Land surface albedo, a fundamental indicator of the Earth’s surface energy balance, is credited as a significant warming species after the three dominant greenhouse gases (CO2, CH4, N2O). Both human activities and natural disturbances have substantially and extensively changed the land cover in grasslands of East Asia, which in turn resulted very different values of albedo and GHGs. Unfortunately, there remain limited knowledge on the magnitude, dynamics, and uncertainty magnitude of albedo-induced global warming potential (GWPa) as well as its relative importance within the context of GHG species, especially in grassland ecosystems. Based on in situ data from eddy covariance (EC) flux towers, static chambers, and satellite images (e.g., MODIS and Landsat) across the drylands in East Asia, we analyzed the long-term changes of GWPa and its relative values to major GHGs in different grasslands. We also attempted to tease apart the contributions of human influences (i.e., grazed steppe, fenced steppe, and mining) and natural disturbances (e.g., precipitation gradient, drought events) to the changed GWPa. The benefits of climatic cooling due to elevated albedo as a result of overgrazing or other disturbances is for the first time quantified and discussed. This synthesis research is based on available open access data, which prevents us from generating spatially and temporally continuous GWPa. We emphasize the importance of GWPa when assessing ecosystems’ overall role in regulating climate for landowners and policy makers.