"Shohei Hattori,Asuka Tsuruta,Yoshinori Iizuka,Koji Fujita,Ryu Uemura,Sumito Matoba,Naohiro Yoshida","Nitrogen isotope of nitrate in Arctic ice core records past anthropogenic energy shift","2018 joint 14th iCACGP QS/15th IGAC SC",,,,,,2018,Sept.