期刊
JOURNAL OF GLACIOLOGY
卷 59, 期 215, 页码 583-591出版社
CAMBRIDGE UNIV PRESS
DOI: 10.3189/2013JoG12J207
关键词
-
资金
- Office of Polar Programs of the US National Science Foundation (NSF) [ANT-1043395]
- NSF-CTEMPs [EAR-1128999]
- NSF
- NASA under NSF Cooperative Agreement [EAR-0735156]
- [ANT-043154]
- [ANT-1043217]
- [ANT-104339]
- [ANT-073286]
- Directorate For Geosciences
- Division Of Earth Sciences [1128999] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1129003] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1043395] Funding Source: National Science Foundation
Monitoring of ice-shelf and sub-ice-shelf ocean temperatures represents an important component in understanding ice-sheet stability. Continuous monitoring is challenging due to difficult surface access, difficulties in penetrating the ice shelf, and the need for long-term operation of non-recoverable sensors. We aim to develop rapid lightweight drilling and near-continuous fiber-optic temperature-monitoring methods to meet these challenges. During November 2011, two instrumented moorings were installed within and below the McMurdo Ice Shelf (a sub-region of the Ross Ice Shelf, Antarctica) at Windless Bight. We used a combination of ice coring for the upper portion of each shelf borehole and hot-point drilling for penetration into the ocean. The boreholes provided temporary access to the ice-shelf cavity, into which distributed temperature sensing (DTS) fiber-optic cables and conventional pressure/temperature transducers were installed. The DTS moorings provided near-continuous (in time and depth) observations of ice and ocean temperatures to a depth of almost 800 m beneath the ice-shelf surface. Data received document the presence of near-freezing water throughout the cavity from November through January, followed by an influx of warmer water reaching similar to 150 m beneath the ice-shelf base during February and March. The observations demonstrate prospects for achieving much higher spatial sampling of temperature than more conventional oceanographic moorings.
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