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Tide and current observations in the central Chukchi Sea during the summer of 2012

Content Provider	Springer Nature Link
Author	Wang, Huiwu Liu, Na Chen, Hongxia
Copyright Year	2016
Abstract	Current data from a moored Acoustic Doppler Current Profiler (ADCP) deployed at 69°30.155´N, 169°00.654´W in the central Chukchi Sea during 2012 summertime is analyzed in the present paper. Characteristics of tidal and residual currents are obtained with Cosine-Lanczos filter and cross-spectral analyses. The main achievements are as follows: 1) Along with the local inertial frequency of 12.8 h, two other peaks at ~12-h and ~10-d dominate the time series of raw velocity; 2) The M$_{2}$ dominates the 6 resolved tide constituents with significant amplitude variations over depth and the ratios of current speed of this constituent to that of the total tidal current are 54% and 47% for u and v components, respectively. All the resolved tidal constituents rotate clockwise at depth with the exception of MM and O$_{1}$. The constituents of M$_{2}$ and S$_{2}$ with the largest major semi-axes are similar in eccentricity and orientation at deeper levels; 3) The maximum of residual currents varies in a range of 20–30 cm s$^{−1}$ over depth and the current with lower velocities flow more true north with smaller magnitudes compared to the current in surface layer. The ~10 d fluctuation of residual current is found throughout the water column and attributed to the response of current to the local wind forcing, with an approximate 1.4 d lag-time at the surface level and occurring several hours later in the lower layer; 4) Mean residual currents flow toward the north with the magnitudes smaller than 7 cm s$^{−1}$ in a general agreement with previous studies, which suggests a relatively weaker but stable northward flow indeed exists in the central Chukchi Sea.
Starting Page	201
Ending Page	208
Page Count	8
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	15
Issue Number	2
e-ISSN	19935021
Language	English
Publisher	Science Press
Publisher Date	2016-02-02
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	central Chukchi Sea tidal and residual currents local wind forcing Oceanography Meteorology
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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