Decadal changes in the atmospheric water cycle and the terrestrial water storage in Northern Eurasia

檜山 哲哉; 藤波 初木; 鈴木 和良

講演情報

[EE] 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] [EE] Environmental, socio-economic and climatic changes in Northern Eurasia

2017年5月20日(土) 15:30 〜 17:00 301A (国際会議場 3F)

コンビーナ:Groisman Pavel(NC State University Research Scholar at NOAA National Centers for Environmental Information, Asheville, North Carolina, USA)、Shamil Maksyutov(National Institute for Environmental Studies)、Kukavskaya Elena(VN Sukachev Institute of Forest, Siberian Branch of Russian Academy of Sciences)、Qiuhong Tang(Institute of Geographic Sciences and Natural Resources Research, CAS)、座長:Groisman Pavel(NC State University, USA)

16:15 〜 16:30

[MIS01-10] Decadal changes in the atmospheric water cycle and the terrestrial water storage in Northern Eurasia

★招待講演

*檜山哲哉¹、藤波初木¹、鈴木和良² (1.名古屋大学宇宙地球環境研究所、2.海洋研究開発機構)

キーワード：Arctic, Lena river basin, Mongolia

We investigated interannual variations in the atmospheric water circulation pattern and the terrestrial water storage change in Northern Eurasia, using long-term atmospheric reanalysis data and the Gravity Recovery and Climate Experiment (GRACE) data. We found interdecadal modulation in the relationships between the interannual variability of summer precipitation and the atmospheric circulation pattern among the three major Siberian river basins (Lena, Yenisei, and Ob). We also revealed a significant increasing (positive) trend of geopotential height in the low-level troposphere since the mid-1980s over Mongolia, resulting in the increasing trend of westerly moisture flux into the Yenisei and Lena river basins. On the contrary, we revealed that summer evapotranspiration has been increasing in tundra region of the eastern Siberian from 2002 to 2015. The increased summer evapotranspiration could be associated with rapid increase of summer air temperatures in the region.