MCR LTER: Coral Reef: Water Column: Offshore Ocean Acidification: Water Profiles, CTD, and Chemistry from 2005 to 2012

This data package contains water chemistry measurements taken 2 to 4 times per year at a station 5 km offshore of the north shore of Moorea, French Polynesia. Measurements include standard CTD parameters, phosphate, silicate, total alkalinity (TA) and total dissolved inorganic carbon (DIC). Sampling began in August, 2005. All water samples were collected with Niskin Bottles. This data includes excerpts from CTD data were collected with a SBE19-Plus Seacat Profiler. CTD and bottle samples were taken on separate casts at each station. (For full CTD data refer to knb-lter-mcr.10 .) All other parameters were calculated from temperature, pressure, nutrients, TA and DIC with CO2Sys programs available at: http://cdiac.ornl.gov/oceans/co2rprt.html (Lewis E. and D. Wallace Program Developed for CO2 System Calculations) using constants K1, K2 from Mehrbach et al, 1973 refit by Dickson and Millero, 1987, Dickson KHSO4, and the Seawater pH scale (mol/kg-SW). If users wish to use different constants and scales, they will need to recalculate using the emperically collected data (TA and DIC).本数据包包含法属波利尼西亚莫雷阿岛北岸外5公里站位的海水化学测量数据，该站位每年开展2至4次采样。测量参数涵盖标准温盐深（CTD）参数、磷酸盐、硅酸盐、总碱度（Total Alkalinity, TA）以及总溶解无机碳（Total Dissolved Inorganic Carbon, DIC）。采样工作始于2005年8月，所有水样均采用尼斯金采水器（Niskin Bottles）采集。本数据集包含采用SBE19-Plus Seacat Profiler采集的CTD数据节选。每个站位的CTD与采水瓶样本分别通过不同下放缆次采集；如需完整CTD数据，请参阅数据集knb-lter-mcr.10。其余所有参数均基于温度、压力、营养盐、总碱度与总溶解无机碳数据，通过CO2Sys程序计算得到。该程序由Lewis E.与D. Wallace开发，用于二氧化碳系统计算，可通过"http://cdiac.ornl.gov/oceans/co2rprt.html"获取。计算过程中采用的解离常数K1、K2源自Mehrbach等1973年的研究，并经Dickson与Millero于1987年修正；同时使用了Dickson KHSO4标准以及海水pH标度（mol/kg-SW）。若使用者希望采用不同的常数与标度，则需基于实测采集的总碱度与总溶解无机碳数据重新计算。