Surface Water and Atmospheric Underway Carbon Data Obtained During the World Ocean Circulation Experiment Indian Ocean Survey Cruises (R/V Knorr, December 1994 - January 1996)

This data documentation presents the results of the surface water and atmospheric underway measurements of mole fraction of carbon dioxide (xCO2), sea surface salinity, and sea surface temperature, obtained during the World Ocean Circulation Experiment (WOCE) Indian Ocean survey cruises (December 1994-January 1996). Discrete and underway carbon measurements were made by members of the CO2 survey team. The survey team is a part of the Joint Global Ocean Flux Study supported by the U.S. Department of Energy to make carbon-related measurements on the WOCE global survey cruises. Approximately 200,000 surface seawater and 50,000 marine air xCO2 measurements were recorded. Seawater values ranged from 310 ppm to greater than 610 ppm. The lowest values (~50 ppm below atmospheric) were measured in the southwestern Indian Ocean, south of Madagascar. The highest values (more than 250 ppm higher than atmospheric) were found in the Arabian Sea associated with the southwest monsoon upwelling.

本数据文档呈现了世界海洋环流实验（World Ocean Circulation Experiment，WOCE）印度洋考察航次（1994年12月—1996年1月）期间获取的表层海水与大气二氧化碳摩尔分数（xCO₂）、海表盐度及海表温度的走航观测结果。离散采样与走航式二氧化碳测量由CO₂考察团队完成，该团队隶属于由美国能源部资助的全球海洋通量联合研究（Joint Global Ocean Flux Study，JGOFS）计划，负责在WOCE全球考察航次中开展碳相关观测工作。本次考察共记录约20万组表层海水与5万组海洋大气二氧化碳摩尔分数数据，海水二氧化碳摩尔分数范围为310 ppm至610 ppm以上。其中最低值（较大气背景值低约50 ppm）测得于马达加斯加以南的印度洋西南部海域；最高值（较大气背景值高出250 ppm以上）则发现于与西南季风上升流相关联的阿拉伯海海域。