Decadal changes in ventilation of the abyssal Southwest Pacific ocean from repeated CFC and new SF6 measurements

重复的 CFC 和新的 SF6 测量显示西南太平洋深海通风的十年变化

• 批准号: 1536115
• 负责人: Mark Warner
• 金额: $ 50.69万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-10-01 至 2021-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1536115&HistoricalAwards=false
• 关键词: Decadal; changes; ventilation; abyssal; Southwest

Oceanic distributions of anthropogenic trace gases provide critical measures of how quickly the ocean interacts with the atmosphere, and its anthropogenic changes, that are difficult to obtain otherwise. Tracer data have been used by scientists to identify large-scale patterns and rates of variability in ventilation, and are critical for validation of climate models. This project will result in high-quality, full water column, tracer data sets which will be available to the broader community via the internet. In addition, the study will train a graduate student in the analytical methods, interpretation, and modeling of these data.The US Repeat Hydrography program includes 6 meridional sections that cross the Antarctic Circumpolar Current and extend into Antarctic waters. The chlorofluorocarbon/sulfur hexafluoride measurements are classified as Level 1 data - of the highest priority - and have been funded through both the National Science Foundation and the National Oceanic and Atmospheric Administration on all of these sections. The zonal spacing between these sections ranges from 25 to 120 degrees of longitude, with the largest gap between 90°E and 150°W. There are two meridional sections in this region that are carried out by the Australians - SR3 along 140°E between Tasmania and Antarctica, and P15S along 170°W between 70°S and the equator. While the Australians carry out most of the Level 1 measurements, they do not have a sea-going chlorofluorocarbon laboratory. To fill this gap in 2001 and 2008/2009, the University of Washington and National Oceanic and Atmospheric Administration-Pacific Marine Environmental Laboratory with support from the National Science Foundation and the National Oceanic and Atmospheric Administration, collaborated with the Australians to make chlorofluorocarbon measurements on both sections. This proposed research will continue the collaboration, measuring chlorofluorocarbons/ sulfur hexafluoride along P15S (April - June 2016) and SR3 (December 2016 - January 2017). This project will collect the data and interpret tracer distributions in context of changes to the ventilation of deep and bottom waters.

人为痕量气体的海洋分布提供了海洋与大气相互作用的速度及其人为变化的关键措施，这是难以获得的。示踪剂数据已被科学家用来确定大规模的模式和通风的变化率，并对气候模型的验证至关重要。该项目将产生高质量的、完整的水柱、示踪剂数据集，这些数据集将通过互联网提供给更广泛的社区。此外，该研究还将培训一名研究生掌握这些数据的分析方法、解释和建模。美国Repeat Hydrography计划包括6个穿越南极绕极流并延伸至南极沃茨的三角断面。氟氯化碳/六氟化硫测量被列为第1级数据-最高优先级-并通过国家科学基金会和国家海洋和大气管理局为所有这些部分提供资金。这些部分之间的纬向间距范围从25到120度经度，最大的差距在90°E和150°W之间。澳大利亚人在这一地区进行了两个纬向剖面--位于塔斯马尼亚和南极洲之间的沿着140°E的SR 3和位于70°S和赤道之间的沿着170°W的P15 S。虽然澳大利亚人进行了大部分的1级测量，但他们没有一个海上氯氟烃实验室。为了在2001年和2008/2009年填补这一空白，华盛顿大学和国家海洋和大气管理局太平洋海洋环境实验室在国家科学基金会和国家海洋和大气管理局的支持下，与澳大利亚合作，对这两个断面进行了氟氯化碳测量。这项拟议的研究将继续合作，测量P15 S（2016年4月至6月）和SR 3（2016年12月至2017年1月）沿着的氯氟烃/六氟化硫。该项目将收集数据并解释深层和底层沃茨通风变化背景下的示踪剂分布。