In Situ Ultraviolet Spectrophotometer (ISUS) for Nitrate, Nitrate, Bisulfide and Bromide Sensing in Seawater

摘要：PI提议开发一种原位分光光度计（ISUS）系统，该系统可以在整个海洋的系泊和CTD型剖面仪上运行。该仪器将用于测量紫外线区的光吸收。在海水中，海洋学家感兴趣的吸收波长小于280纳米光的化合物包括硝酸盐、亚硝酸盐、二硫化物和溴离子。PI表明，这些化合物的测量可以在大多数海洋学研究所需的水平上进行，而无需化学操作。ISUS系统对于在电导率-盐度关系失效的地区（例如相分离的热液流体）进行营养循环、热液系统和主要溴化离子光学检测的生物地球化学研究将大有裨益。该提案与H. Milburn和G. Massoth向NOAA/NURP项目提交的单独提案相协调，他们将开发ALVIN潜水器上的系统，使PI能够在热液喷口位置部署仪器。

Proposal #: 99-06983Abstract: The PI's propose to develop an In Situ Spectrophotometer (ISUS) system that can operate throughout the ocean on moorings and CTD type profilers. The instrument will be developed to measure the absorption of light in the ultraviolet region. In seawater, compounds of interest to oceanographers that absorb light at wavelengths less than 280 nm include nitrate, nitrite, bisulfide and bromide ions. The PI's show that measurements of these compounds can be routinely made at the levels required for most oceanographic studies without chemical manipulations. An ISUS system would be of enormous benefit for biogeochemical studies of nutrient cycling, hydrothermal systems and optical detection of the major ion bromide in areas where the conductivity-salinity relationship breaks down (e.g. in phase-separated hydrothermal fluids). This proposal is coordinated with a separate proposal to the NOAA/NURP program by H. Milburn and G. Massoth who will develop systems on the ALVIN submersible that will allow the PI's to deploy the instrument at hydrothermal vent sites.