In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 138, No. 3_Supplement ( 2015-09-01), p. 1743-1743
Abstract:
Fram Strait is the only deep-water connection between the Arctic and the world oceans. An acoustic system for tomography, glider navigation, and passive listening was installed in the central, deep-water part of the Strait during 2010–2012, with the primary objective of improving the estimates of transport through the Strait. Previous tomographic measurements have relied on the travel times of resolved, identified, and stable acoustic arrivals. The oceanographic conditions and highly variable sea ice in Fram Strait provide an acoustic environment that differs substantially from those in other tomographic experiments, however, and results in complex arrival patterns. Comparisons of the measured arrival patterns with predictions based on hydrographic sections show that it is difficult to resolve and identify individual arrivals in the early part of the arrival patterns. In addition, the early arrivals are unstable, with the arrival structure changing significantly over time. Later arrivals that are surface-reflected, bottom-reflected tend to be easier to resolve and identify, as well as more stable. The implication is that inverse methods need to use fluctuations in the overall structure of the early arrivals, which tend to sample the ocean similarly, in combination with the travel times of the later arrivals.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
2015
detail.hit.zdb_id:
1461063-2
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