Show simple item record

contributor authorWang, Pengcheng
contributor authorHe, Zhongjie
contributor authorThompson, Keith R.
contributor authorSheng, Jinyu
date accessioned2019-09-22T09:03:13Z
date available2019-09-22T09:03:13Z
date copyright11/27/2018 12:00:00 AM
date issued2018
identifier otherJPO-D-18-0047.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262543
description abstractNear-inertial oscillations (NIOs) on the inner Scotian shelf are studied using observations, a simple slab model, and two operational shelf circulation models. High-frequency radar and ADCP observations from December 2015 to February 2016 show that individual NIO events forced by time-varying wind stress typically lasted for three to four inertial periods. NIOs with speeds exceeding 0.25 m s?1 were observed in the offshore part of the study region, but their amplitudes decreased shoreward within ~40 km of the coast. The NIOs had spatial scales of ~80 and ~40 km in the alongshore and cross-shore directions, respectively. The NIO phases varied moving from west to east, consistent with the typical movement of winter storms across the study region. Evolving rotary spectral analysis reveals that the peak frequency fp of the NIOs varied with time by ~7% of the local inertial frequency. The variation in fp can be explained in part by local wind forcing as demonstrated by the slab model. The remaining variation in fp can be explained in part by variations in the background vorticity associated with changes in the strength and position of the Nova Scotia Current, an unstable baroclinic boundary current that runs along the coast to the southwest. Two operational shelf circulation models are used to examine the abovementioned features in the high-frequency-radar and ADCP observations. The models reproduce the spatial structure of the NIOs and, in a qualitative sense, the temporal variations of fp.
publisherAmerican Meteorological Society
titleModulation of Near-Inertial Oscillations by Low-Frequency Current Variations on the Inner Scotian Shelf
typeJournal Paper
journal volume49
journal issue2
journal titleJournal of Physical Oceanography
identifier doi10.1175/JPO-D-18-0047.1
journal fristpage329
journal lastpage352
treeJournal of Physical Oceanography:;2018:;volume 049:;issue 002
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record