Essential upgrades to resistivity instruments

PI开发了一种能够测量温度和流体电阻率的现场仪器，作为氯化物浓度的代表。该仪器已在两个RIDGE 2000综合研究站点部署了几个月。这些数据表明氯化物浓度的意外短期变化。在该提案中，PI要求提供资金，通过将电极传感单元中的陶瓷绝缘体从氧化锆改为氧化铍来提高这些仪器的可靠性和耐用性，并在现场条件下的实验室实验中表征这些新传感器的精度，准确度和漂移特性。PI还建议升级三个现有仪器的电子设备，以更高的数据速率提供更长的部署，以更好地表征已发现的氯化物的快速变化。氯离子浓度是控制高温热液流体化学组成的主要变量。近年来，人们观察到了相分离的性质和程度的短期和非常剧烈的时间变化，以及由于岩浆岩脉和喷发事件而导致的热液中氯化物浓度的变化。更广泛的影响： 为地球社区开发传感器是我们目前的最高优先事项之一。该PI建议教育学生开发和利用传感器，并通过UW技术转让计划将传感器提供给科学家使用。这项提议显然与技术开发有关，而技术开发对海底观测站非常重要。它将为研究生论文的主要部分提供资金，并为学生提供海洋学，材料科学和电气工程方面的交叉培训。

The PIs have developed an in-situ instrument capable of measuring temperature and fluid resistivity as a proxy for chloride concentration. This instrument has been deployed at two RIDGE 2000 Integrated Study Sites for periods of several months. These data indicate unexpected short term changes in chloride concentration. In this proposal the PIs request funds to improve the reliability and durability of these instruments by changing the ceramic insulator in the electrode sensing unit from zirconia to berrylia and to characterize the precision, accuracy and drift characteristics of these new sensors in laboratory experiments under in-situ conditions. The PIs also propose to upgrade the electronics of three existing instruments to provide longer deployments at higher data rates to better characterize the rapid changes in chloride that have been discovered. The concentration of chloride ion is a master variable in controlling the chemical composition of high temperature hydrothermal fluids. Short term and very dramatic temporal changes in the nature and degree of phase separation and the resultant changes in chloride concentration in hydrothermal fluids as a result of magmatic diking and eruptive events have been observed in recent years. Broader Impacts: Development of sensors for geo community is one of the highest priorities we have at present. This PI proposes to educate a student in the development and utilization of the sensor as well as to put the sensor out for use by scientists through the UW Tech Transfer program. This proposal is clearly linked to technology development that will be very important for seafloor observatories. It will provide funding for major portion of a graduate student thesis and provide the student with cross-training in oceanography, materials science, and electrical engineering.