The life-cycle of spontaneously generated internal waves

The life-cycle of spontaneously generated internal waves AbstractRecent numerical modelling studies have suggested significant spontaneous internal wave generation near the ocean surface, and energy transfers to and from these waves in the ocean interior. Spontaneous generation is the emission of waves by unbalanced, large Rossby number flows in the absence of direct forcing. Here the authors’ previous work is extended to investigate where and how these waves exchange energy with the non-wave (mean) flow. A novel double-filtering technique is adopted to firstly separate the wave and non-wave fields, and secondly, the individual upward and downward propagating wave fields, and thereby identify the pathways of energy transfer. These energy transfers are dominated by the interaction of the waves with the vertical shear in the mean flow. Spontaneously generated waves are found to be oriented such that the downward propagating wave is amplified by the mean shear. The internal waves propagate through the entire model depth while dissipating energy, and reflect back upwards. The now upward propagating waves have the opposite sign interaction with the mean shear and decay, losing most of their energy to the non-wave flow in the upper 500m. Overall, in the simulations described here, approximately 30% of the wave energy is dissipated and 70% is returned to the mean flow. The apparent preferential orientation of spontaneous generation suggests a potentially unique role for these waves in the ocean energy budget in uniformly drawing net energy from mean flow in the upper ocean interior and transporting it to depth. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

The life-cycle of spontaneously generated internal waves

Loading next page...
 
/lp/ams/the-life-cycle-of-spontaneously-generated-internal-waves-j90Elo0Hnv
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0485
D.O.I.
10.1175/JPO-D-17-0153.1
Publisher site
See Article on Publisher Site

Abstract

AbstractRecent numerical modelling studies have suggested significant spontaneous internal wave generation near the ocean surface, and energy transfers to and from these waves in the ocean interior. Spontaneous generation is the emission of waves by unbalanced, large Rossby number flows in the absence of direct forcing. Here the authors’ previous work is extended to investigate where and how these waves exchange energy with the non-wave (mean) flow. A novel double-filtering technique is adopted to firstly separate the wave and non-wave fields, and secondly, the individual upward and downward propagating wave fields, and thereby identify the pathways of energy transfer. These energy transfers are dominated by the interaction of the waves with the vertical shear in the mean flow. Spontaneously generated waves are found to be oriented such that the downward propagating wave is amplified by the mean shear. The internal waves propagate through the entire model depth while dissipating energy, and reflect back upwards. The now upward propagating waves have the opposite sign interaction with the mean shear and decay, losing most of their energy to the non-wave flow in the upper 500m. Overall, in the simulations described here, approximately 30% of the wave energy is dissipated and 70% is returned to the mean flow. The apparent preferential orientation of spontaneous generation suggests a potentially unique role for these waves in the ocean energy budget in uniformly drawing net energy from mean flow in the upper ocean interior and transporting it to depth.

Journal

Journal of Physical OceanographyAmerican Meteorological Society

Published: Dec 27, 2017

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from Google Scholar, PubMed
Create lists to organize your research
Export lists, citations
Access to DeepDyve database
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off