日本地球惑星科学連合2018年大会

講演情報

[EJ] ポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS13] インド洋域の物理・生物地球化学・生態系と相互連関

2018年5月22日(火) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:升本 順夫(東京大学大学院理学系研究科)、齊藤 宏明(東京大学大気海洋研究所)、植木 巌(国立研究開発法人海洋研究開発機構)

[AOS13-P02] Dissolved organic carbon in the Indonesian Throughflow

*重光 雅仁1吉川 知里1脇田 昌英1村田 昌彦1 (1.国立研究開発法人 海洋研究開発機構)

キーワード:溶存有機炭素、インド洋、インドネシア通過流

Dissolved organic carbon (DOC) is considered to be an important reservoir of reduced carbon in the ocean. In this study, we aimed to gain insights into the amount of DOC transported via the Indonesian throughflow from the Pacific to the Indian Ocean. To this end, we measure DOC concentrations for the seawater samples obtained in a revisit cruise along World Ocean Circulation Experiment-Hydrographic Programme (WHP) line I10 between Indonesia and Australia, from December 2015 to January 2016. The repeatability of DOC is ~1.0 μmol kg-1. Along the I10 line, DOC concentrations range from ~38μmol kg-1 in the deep waters to ~80μmol kg-1 in the shallow waters. The Indonesian Throughflow Waters are observed as the fresh surface and intermediate waters. In the intermediate waters, DOC concentrations are slightly higher compared to those in the other intermediate waters. The net transport along the line into the Indian Ocean is estimated to be ~9-~18 Sv, using several estimates of geostrophic velocity. In the presentation, we will discuss the transport of DOC from the Pacific to the Indian Ocean.