节点文献

Outflow from under the Pine Island Bay Ice Shelf: finescale structure and its temporal variability

免费订阅

【作者】 Robin Robertson

【Author】 Robin Robertson;School of Physical, Environmental, and Mathematical Sciences, University of New South Wales;Department of Marine Science, Nanjing University of Information Science and Technology;

【机构】 School of Physical, Environmental, and Mathematical Sciences, University of New South WalesDepartment of Marine Science, Nanjing University of Information Science and Technology

【摘要】 The water column structure of the ice shelf cavity outflow from under Pine Island Glacier and its temporal variability were investigated using a hourly time series of yo-yo CTD and LADCP data collected over 24 h at the southern end of the ice shelf front. The primary water types present over the continental shelf off Pine Island Bay were Circumpolar Deep Water(CDW), modified Circumpolar Deep Water(m CDW), Shelf Water(SW), and Ice Shelf Water(ISW). As CDW transited the shelf, it transitioned into cooler, m CDW. In the upper 200 m, ISW dominated within 100 km of the ice shelf and SW further offshore. Within Pine Island Bay, the water column was partitioned into two primary layers based on their behavior: an upper outflowing layer from 100 m to 450 m composed of ISW with a significant meltwater component, 1%–2%, over an inflowing layer from 550 m to the sea bed composed of m CDW. Due to the small cavity extent, the outflowing water was warmer than the seawater freezing point. The upper ISW layer was further split into upper ISW layer #1(100–300 m) and upper ISW layer #2(320–450 m) with the transition coinciding with the ice shelf draft. Small step-like features with heights from 1–50 m existed within both the ISW layers and were more prominent in upper ISW layer #1. A baroclinic signal at the semidiurnal frequency existed within both primary layers with the strongest signal, 10 cm·s-1, propagating vertically in the upper ISW layer.

【基金】 support personnel on the RVIB Nathaniel B.Palmer during NPB0901;funded partially by both the Australian Antarctic Division,project 2944
【所属期刊栏目】 Article (2016年04期)
  • 【DOI】10.13679/j.advps.2016.4.00245
  • 【分类号】P343.6
  • 【下载频次】1
节点文献中: 

本文链接的文献网络图示:

浏览历史:
下载历史: