Investigation of the CO2 System during the 1989-GOFS Expedition in the North Atlantic

在预定的1989-GOFS北大西洋考察期间，将在33 N和60 N之间的20 W子午线上测量离散的水样中的总CO2浓度和CO2分压。在海上用精度为+1.5微米/公斤或更高的库仑计测定二氧化碳总浓度，在海上用平衡器-气相色谱法测定二氧化碳分压，精度为0.1%。船上有一个由两名分析师组成的团队(即每台仪器一名)，每天将分析40至45个水样，以检测这些二氧化碳的每一种性质。利用这一数据生成速度和测量精度，可以分辨出与主要海洋动力特征有关的二氧化碳分布，以及海洋光带内外二氧化碳分布中的细微特征。探险期间收集的二氧化碳和二氧化碳总量数据将成为GOFS参与者基本公共数据集的一部分。利用水文、生物和化学资料，将解决以下问题：1)在1981-TTO/北大西洋研究期间在地表水中观察到的以50N和20W为中心的强CO2汇区的来源；2)利用Takahashi等人的等周期分析方法研究了水体中再生营养盐C/P比值的地理和深度变化。(1985)；和3)亚北极和温带环流地区二氧化碳营养化学的季节变化，以及这两个地区之间在过渡带内发生的生物地球化学过程方面的相互作用。

The total CO2 concentration and partial pressure of CO2 will be measured in discrete water samples during the scheduled 1989-GOFS North Atlantic Expedition along the 20 W meridian between 33 N and 60N. The total CO2 concentration will be determined at sea by means of a coulometer with a precision of +1.5 uM/kg or better, and the CO2 partial pressure will be determined also at sea by means of equilibrator-gas chromatograph method with a precision of 0.1%. With a team of two analysts aboard (i.e. one for each instrument), 40 to 45 water samples will be analyzed per day for each of these CO2 properties. With this rate of data production and with the precision of measurements, the CO2 distribution associated with major ocean dynamic features as well as fine features in the CO2 distribution within and below the photic zone of the ocean can be resolved. The total CO2 and pCO2 data collected during the expedition will become part of the basic communal data set for the GOFS participants. Using the hydrographic, biological and chemical data, the following questions will be addressed; 1) the orgin of a strong CO2 sink area centered at 50 N and 20 W, which was observed in the surface water during the 1981-TTO/North Atlantic Study; 2) the geographic and depth variability of the C/P ratio for regenerated nutrients in the water column using the isopycnal analysis method of Takahashi et al. (1985); and 3) seasonal changes in the CO2-nutrient chemistry in the subarctic and temperate gyre regimes, and interaction between these two regimes in terms of the bio-geochemical processes occurring within the transition zone.