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

建议#：99-06983摘要：PI‘s建议开发一种可在系泊设备和CTD型剖面仪上在整个海洋中运行的原位分光光度计(ISU)系统。该仪器将被开发用于测量紫外线区域的光吸收。在海水中，海洋学家感兴趣的吸收波长小于280纳米的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，这些化合物的测量通常可以在大多数海洋学研究所需的水平上进行，而不需要进行化学操作。ISUS系统对于营养循环的生物地球化学研究、水热系统以及在电导率-盐度关系破坏的地区(例如，在相分离的热液流体中)主要离子溴的光学探测将大有裨益。这一建议与H.Milburn和G.Massoth向NOAA/NURP计划提出的单独建议相协调，他们将在Alvin潜水器上开发系统，允许PI在热液喷口地点部署仪器。

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.