Articles | Volume 28, issue 3
Nonlin. Processes Geophys., 28, 445–465, 2021
https://doi.org/10.5194/npg-28-445-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue: Nonlinear internal waves
Nonlin. Processes Geophys., 28, 445–465, 2021
https://doi.org/10.5194/npg-28-445-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article 14 Sep 2021
Research article | 14 Sep 2021
Enhanced diapycnal mixing with polarity-reversing internal solitary waves revealed by seismic reflection data
Yi Gong et al.
Related authors
Wenhao Fan, Haibin Song, Yi Gong, Shun Yang, and Kun Zhang
Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2021-31, https://doi.org/10.5194/npg-2021-31, 2021
Revised manuscript under review for NPG
Short summary
Short summary
A large number of mode-2 ISWs have been imaged using seismic reflection method. It is found that the relationships between propagation velocity and amplitude, as well as wavelength and amplitude of the mode-2 ISWs in the study area are diverse and affected by factors such as seawater depth, pycnocline depth, and pycnocline thickness. The vertical structure of the mode-2 ISWs’ amplitude in the study area is affected by the ISWs nonlinearity and the shift of the pycnocline center.
Wenhao Fan, Haibin Song, Yi Gong, Shun Yang, and Kun Zhang
Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2021-31, https://doi.org/10.5194/npg-2021-31, 2021
Revised manuscript under review for NPG
Short summary
Short summary
A large number of mode-2 ISWs have been imaged using seismic reflection method. It is found that the relationships between propagation velocity and amplitude, as well as wavelength and amplitude of the mode-2 ISWs in the study area are diverse and affected by factors such as seawater depth, pycnocline depth, and pycnocline thickness. The vertical structure of the mode-2 ISWs’ amplitude in the study area is affected by the ISWs nonlinearity and the shift of the pycnocline center.
Loren Carrere, Brian K. Arbic, Brian Dushaw, Gary Egbert, Svetlana Erofeeva, Florent Lyard, Richard D. Ray, Clément Ubelmann, Edward Zaron, Zhongxiang Zhao, Jay F. Shriver, Maarten Cornelis Buijsman, and Nicolas Picot
Ocean Sci., 17, 147–180, https://doi.org/10.5194/os-17-147-2021, https://doi.org/10.5194/os-17-147-2021, 2021
Short summary
Short summary
Internal tides can have a signature of several centimeters at the ocean surface and need to be corrected from altimeter measurements. We present a detailed validation of several internal-tide models using existing satellite altimeter databases. The analysis focuses on the main diurnal and semidiurnal tidal constituents. Results show the interest of the methodology proposed, the quality of the internal-tide models tested and their positive contribution for estimating an accurate sea level.
Related subject area
Subject: Bifurcation, dynamical systems, chaos, phase transition, nonlinear waves, pattern formation | Topic: Climate, atmosphere, ocean, hydrology, cryosphere, biosphere | Techniques: Simulation
The effect of strong shear on internal solitary-like waves
Effects of upwelling duration and phytoplankton growth regime on dissolved-oxygen levels in an idealized Iberian Peninsula upwelling system
Marek Stastna, Aaron Coutino, and Ryan K. Walter
Nonlin. Processes Geophys., 28, 585–598, https://doi.org/10.5194/npg-28-585-2021, https://doi.org/10.5194/npg-28-585-2021, 2021
Short summary
Short summary
Large-amplitude waves in the interior of the ocean-internal waves in the ocean propagate in a dynamic, highly variable environment with changes in background current, local depth, and stratification. These waves have a well-known mathematical theory that, despite considerable progress, has some gaps. In particular, waves have been observed in situations that preclude an application of the mathematical theory. We present numerical simulations of the spontaneous generation of such waves.
João H. Bettencourt, Vincent Rossi, Lionel Renault, Peter Haynes, Yves Morel, and Véronique Garçon
Nonlin. Processes Geophys., 27, 277–294, https://doi.org/10.5194/npg-27-277-2020, https://doi.org/10.5194/npg-27-277-2020, 2020
Short summary
Short summary
The oceans are losing oxygen, and future changes may worsen this problem. We performed computer simulations of an idealized Iberian Peninsula upwelling system to identify the main fine-scale processes driving dissolved oxygen variability as well as study the response of oxygen levels to changes in wind patterns and phytoplankton species. Our results suggest that oxygen levels would decrease if the wind blows for long periods of time or if phytoplankton is dominated by species that grow slowly.
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Short summary
When the internal solitary wave propagates to the continental shelf and slope, the polarity reverses due to the shallower water depth. In this process, the internal solitary wave dissipates energy and enhances diapycnal mixing, thus affecting the local oceanic environment. In this study, we used reflection seismic data to evaluate the spatial distribution of the diapycnal mixing around the polarity-reversing internal solitary waves.
When the internal solitary wave propagates to the continental shelf and slope, the polarity...
Special issue