Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Tokyo, 108-8477, Japan.
Research Center for Environmental Modeling and Application, Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan.
Sci Rep. 2022 May 19;12(1):8462. doi: 10.1038/s41598-022-12109-4.
Chlorofluorocarbon (CFC) and sulfur hexafluoride (SF) were used to investigate the timescale of Antarctic Bottom Water (AABW) that spreads off Cape Darnley (CD) in East Antarctica. The age of the AABW was estimated based on the observed SF/CFC-12 ratio while taking into account tracer dilution by Lower Circumpolar Deep Water. Along the western canyons off CD and the ~ 3000 to 3500 m isobaths, the bottom water age was < 5 years, reflecting the spread of newly formed CD Bottom Water. Higher ages of ~ 8 years obtained for areas east of CD and > 20 years in the northwestern offshore region indicate inflows of AABW through the Princess Elizabeth Trough and Weddell Sea Deep Water, respectively. This study determined the age distribution in the region off CD, where three different types of AABW spread.
氯氟碳化合物（CFC）和六氟化硫（SF）被用来研究在南极洲东端的达恩利角（CD）扩散的南极底层水（AABW）的时间尺度。通过考虑到由下环极深海水造成的示踪剂稀释，根据观察到的 SF/CFC-12 比值来估计 AABW 的年龄。在 CD 西部峡谷和 3000 到 3500 米等深线附近，底层水的年龄<5 年，反映了新形成的 CD 底层水的扩散。在 CD 东部地区获得的更高的年龄约为 8 年，以及在西北近海地区超过 20 年的年龄，分别表明 AABW 通过伊丽莎白公主海岭和威德尔海深水的流入。本研究确定了在三个不同类型的 AABW 扩散的 CD 附近区域的年龄分布。
