Nitrogen isotopic ratios of phytoplankton in the western subtropical North Pacific

Chisato Yoshikawa1, Haruyo Yamaguchi2, Nanako O Ogawa1, Akiko Makabe1, Yohei Matsui1, Shinsuke Kawagucci1 and Naohiko Ohkouchi1, (1)JAMSTEC, Yokosuka, Japan, (2)NIES, Japan