Carbon Dioxide Concentrations in Surface Water and the Atmosphere during 1986-1989 NOAA/PMEL Cruises in the Pacific and Indian Oceans

This document presents data on carbon dioxide (CO2) concentrations in surface water and the atmosphere collected during the Pacific Marine Environmental Laboratory (PMEL) expeditions during 1986-1989. CO2 was measured quasi-continuously on 5 PMEL expeditions (12 legs) in the Pacific and Indian Oceans. These cruises were conducted under support from the National Oceanic and Atmospheric Administration (NOAA). CO2 measurements in the atmosphere and in surface water were made by analyzing mixing ratios of CO2 with an automated, temperature-controlled gas chromatographic system described by Murphy et al. (1991) and Bates et al. (1993). Instrument precision was determined by the average percent standard deviation of the standard response over a 6-hour period. The precision varied between cruises but was always less than 1.2% and was more typically around 0.4%. Air was pumped through 3/8-inch diameter, plastic-coated, aluminum tubing from the jackstaff on the bow of the ship (10 meters above the sea surface) to the oceanographic laboratory for analysis. Surface seawater entered the ship via a forward intake line located approximately 5 meters below the water level.

本数据集收录了1986—1989年间太平洋海洋环境实验室（Pacific Marine Environmental Laboratory, PMEL）科考航次所采集的表层海水与大气二氧化碳（carbon dioxide, CO₂）浓度数据。研究团队在太平洋与印度洋海域的5次PMEL科考航次（含12个航段）中，对CO₂开展了准连续观测。本批航次由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）资助实施。大气与表层海水的CO₂浓度观测，通过分析CO₂的混合比完成，所用设备为Murphy等（1991）及Bates等（1993）所报道的自动化温控气相色谱系统。仪器精度通过6小时内标准响应的平均百分比标准差评定。不同航次的精度存在小幅差异，但始终低于1.2%，常规情况下稳定在0.4%左右。大气样本通过直径3/8英寸的覆塑铝管，从船首旗杆（高出海面10米）抽取至海洋学实验室以供分析。表层海水通过位于水下约5米处的前置取水管路进入科考船。