Nitrogen isotopic ratios of phytoplankton in the western subtropical North Pacific
Chisato Yoshikawa1, Haruyo Yamaguchi2, Nanako O Ogawa3, Akiko Makabe1, Yohei Matsui1, Shinsuke Kawagucci4 and Naohiko Ohkouchi1, (1)JAMSTEC, Yokosuka, Japan, (2)NIES, Japan, (3)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Biogeochemistry Research Center (BGC), Research Institute for Marine Resources Utilization (MRU), Kanagawa, Japan, (4)JAMSTEC, Research Institute for Global Change (RIGC), Yokosuka, Japan