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关键的衡量标准，即海洋与大气相互作用的速度及其人为变化，这些变化很难获得。示踪剂数据已被科学家使用来识别通风的大规模模式和可变性率，对于验证气候模型至关重要。该项目将导致高质量，完整的水柱，示踪数据集，可通过互联网向更广泛的社区使用。此外，该研究将培训研究生的分析方法，解释和对这些数据的建模。美国重复水文计划包括6个子午线段，这些部分越过南极圆形极性电流并延伸到南极水域。氯氟化合物/硫六氟化物的测量值分类为优先级的1级数据 - 并已通过国家科学基金会和国家海洋和大气管理部门在所有这些部分中获得资金。这些部分之间的区域间距范围为25至120度的经度，最大的间隙在90°E和150°W之间。澳大利亚人在塔斯马尼亚州和南极洲之间的140°E沿澳大利亚人进行了两个子午线 - SR3进行，以及沿70°S和等等器之间的170°W沿170°W进行的P15。尽管澳大利亚人进行了大多数级别的测量，但他们没有海氯氟化合物实验室。为了填补2001年和2008年2009年的这一空白，华盛顿大学和国家科学基金会和国家海洋和大气管理局的支持以及澳大利亚人与澳大利亚人合作，与澳大利亚人合作，在这两个部分上进行了氯氟二烯测量，并在国家科学基金会和国家海洋和大气管理局的支持下进行了支持。这项拟议的研究将继续进行合作，测量沿P15S（2016年4月 - 2016年4月）和SR3（2016年12月至2017年1月）沿P15S（2016年4月至6月）的氯氟甲氟烷/硫磺甲氟烷。该项目将收集数据并解释示踪剂分布，这是对深水和底水通风的变化。