Calcification and Photosynthesis Measurements for the JGOFS Equatorial Pacific Study

该项目将测量碳吸收率， 钙化和光合作用的过程， JGOFS在赤道太平洋巡航。 绝 方解石对东部沉积物的贡献 赤道太平洋早已实现（占总数的70- 90 沉积物质量是方解石，少于1%是有机物）。此外，委员会认为， 这些方解石中有一半是由 球石藻类植物，被称为球石藻。 利用已公布的赤道地区积累率数据 太平洋地区和保守的假设， 生物固定的方解石，最终被掩埋，它可以是 认为钙化至少与新生血管的数量相等， 热带太平洋东部的生产。方面的 碳最终被埋在每年的时间尺度上，方解石 占主导地位的碳通量，而大多数的有机物质是 在水柱中再氧化成二氧化碳（CO2）。 这个项目将记录地表的规模 钙化信号沿着标准光合作用 测量.将进行模拟现场测量 钙化和光合作用。 数据将被比较 用沉积物收集器的数据作为沉积物的交叉检查- 陷阱衍生的积累率;在一个地区，如 赤道太平洋以其巨大的海流切变而闻名， 这种核查是必不可少的。 这些数据也将代表 一些对表面钙化的第一次直接测量， 赤道太平洋，将有重大利益， 对生物学家和地质学家都有用。

This project will measure the rates of carbon uptake through the process of calcification and photosynthesis during one of the JGOFS cruises in the equatorial Pacific. The overwhelming contribution of calcite to the sediments of the eastern equatorial Pacific has long been realized (70-90% of the total sediment mass is calcite, and less than 1% is organic). Moreover, half of this calcite is produced from the calcified plates of coccolithophorid phytoplankters which are called coccoliths. Using published data on accumulation rates in the equatorial pacific region and conservative assumptions about the ratio of biologically fixed calcite which is ultimately buried, it can be argued that calcification is at least of equal magnitude to new production in the eastern tropical Pacific. In terms of the carbon which is ultimately buried on a yearly time scale, calcite dominated the carbon flux while most of the organic material is re-oxidized to carbon dioxide (CO2) within the water column. This project will document the magnitude of the surface calcification signal along with the standard photosynthesis measurements. Simulated-in-situ measurements will be performed of both calcification and photosynthesis. The data will be compared with the sediment trap data as a cross-check of the sediment- trap-derived accumulation rates; in a region such as the equatorial Pacific, which is known for its large current shears, this verification is essential. The data will also represent some of the first direct measurements of surface calcification in the equatorial Pacific and will be of significant interest and use to both biologists and geologists.