Progress on deep meridional overturning circulation in the South China Sea

December 04, 2016

The MOC is the meridional-vertical circulation that affects the global material (fresh water, carbon, etc.) and energy redistribution. Related studies show that MOC has strong implications for the long-term variation of ENSO, the position of the Intertropical Convergence Zone and the marine ecosystem, and further impacts the long-term climate change. Deep SCS MOC is a good indication for the characteristics of the deep circulation and is closely related to the freshwater and heat balance, and the sediment transport.

Science China Earth Sciences published a review paper of Dr. Dongxiao Wang (the first author) and Dr. Qiang Xie (corresponding author) in Volume 59 (in English version), which summarized the progress on SCS MOC of Dongxiao Wang's group and other researchers.

The deep SCS horizontally cyclonic circulation is mainly controlled by the downwelling branch of the MOC (Luzon Strait overflow). Mixing induced by tides and eddies further enhanced the cyclonic circulation. Because of the conservation of potential vorticity, the SCS MOC drives an anticyclonic circulation anomaly. The anomalous anticyclonic circulation overlapping on the upper horizontal circulation weakens (strengthens) the western boundary current (WBC) in winter (summer).

The SCS MOC presents an unclosed "sandwich" structure. The upwelling areas of the MOC are mainly located in the slope and three northwest-southeast tilted zones. One possible mechanism for the upwelling areas is the interaction between the topography Rossby waves (TRWs) and the westward planetary Rossby waves. Moreover, the TRWs are confirmed in the southern SCS by a five-year mooring observation.

This paper reviewed the roles of Luzon Strait overflow and complex topography in SCS deep circulation and deep MOC, which might provide insightful ideas for the related fields.
This article was published on the Science China (Earth Sciences). More details can be seen: D. Wang, J. Xiao, Y. Shu, Q. Xie*, J. Chen, Q. Wang, Progress on deep circulation and meridional overturning circulation in the South China Sea. Science China, 59: 1827-1833.

Science China Press

Science China Press

Related Topography Articles from Brightsurf:

How do giraffes and elephants alter the African Savanna landscape?
Through their foraging behavior across the diverse topography of the African savanna, megaherbivores may be unknowingly influencing the growth and survival of vegetation on valleys and plateaus, while preserving steep slopes as habitat refugia.

Biomaterial immune control discoveries could reduce implant rejection
Scientists have discovered how the materials used in medical implants like artificial joints can be adapted to control the immune response to them and reduce the risk of rejection.

The origins of roughness
A Freiburg researcher investigates the origins of surface texture.

UCI-led team releases high-precision map of Antarctic ice sheet bed topography
A University of California, Irvine-led team of glaciologists has unveiled the most accurate portrait yet of the contours of the land beneath Antarctica's ice sheet -- and, by doing so, has helped identify which regions of the continent are going to be most vulnerable to the impact of future climate warming.

New remote-controlled 'smart' platform helps in cardiovascular disease treatment
A joint research group led by Dr. DU Xuemin at the Shenzhen Institutes of Advanced Technology (SIAT) of the Chinese Academy of Sciences recently demonstrated a remote-controlled 'smart' platform that effectively directs programmed vascular endothelium remodeling in a temporally controllable manner.

Scientists find eternal Nile to be more ancient than previously thought
The Nile's unchanging path has been a geologic mystery because long-lived rivers usually move over time.

Why are mountains so high?
Stanford researchers have analyzed mountain ranges worldwide to show that a theory relating erosion and mountain height doesn't always add up.

Topography could save sensitive saguaros as climate changes
By studying nearly five decades of data on more than 5,800 saguaros dotting Tumamoc Hill, researchers found that small variations in the hill's topography might buffer saguaro populations from the impacts of climate change.

Volcano cliffs can affect monitoring data, study finds
New research led by the University of East Anglia reveals that sharp variations of the surface of volcanoes can affect data collected by monitoring equipment.

Discovery casts doubt on cell surface organization models L
Like planets, the body's cell surfaces look smooth from a distance but hilly closer up.

Read More: Topography News and Topography Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to