Mobile version

Internal tides in the Solomon Sea change with ENSO phases

Image of the Month - September 2019

To top

Root-mean-square of sea surface height variability for the 3-month periods of the El Niño state (left column) and of the La Niña state (right column). Unit is in cm. The top panel is the high frequency variability (periods < 48h), dominated by the internal tides (both coherent and incoherent components) and the bottom panel is the incoherent internal tide variability. (Credits Legos)
Root-mean-square of sea surface height variability for the 3-month periods of the El Niño state (left column) and of the La Niña state (right column). Unit is in cm. The top panel is the high frequency variability (periods < 48h), dominated by the internal tides (both coherent and incoherent components) and the bottom panel is the incoherent internal tide variability. (Credits Legos)

The Solomon Sea in the South-west Pacific is a semi-enclosed sea, bordered by the island of New Guinea to the West, the islands of New Britain and New Ireland to the North, and the Solomon Islands to the East. The circulation in this basin is highly constrained by those islands and the bathymetric features surrounding them. Moreover, the Solomon Sea is highly sensitive to the ENSO phases, which modulate mesoscale activity and stratification. The principal lunar semidiurnal constituent (M2) generates there energetic internal tides at three principal sites where strong tidal currents encounter sharp topography in the stratified ocean.  Thus this Sea enables to study the diversity of internal tide signature with differences depending on the ENSO phases, in particular if looking at 1997-1998 (strong El Niño) vs 1999 (strong La Niña).

A study shows that La Niña, with a high level of mesoscale activity, favors the appearance of incoherent internal tides while El Niño, with a stratification close to the surface, is more characterized by small scale coherent tide-induced sea surface heights.

A global view of internal tide generation, propagation, and dissipation has emerged in recent years, mainly from satellite altimetry observations and global high-resolution numerical models. However, a better knowledge of internal tides, both coherent and incoherent, is primordial for Swot altimetry mission. This study in the Solomon Sea shows the complexity in predicting internal tides. This knowledge will be mandatory to access meso and submesoscale signatures from the future Swot mission.

See also:

References:

  • Tchilibou, M.,  L. Gourdeau, F. Lyard, R. Morrow, A. Koch Larrouy, D. Allain, B. Djath, 2019, Internal tides in the Solomon Sea in contrasted ENSO conditions, Ocean Sciences (submitted)
EnglishFrançaisEspañol
Rss feedsContactSitemapPartnersFAQGlossaryLexiconMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

The new home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!