Mobile version

Winds and currents around India

Image of the Month - December 2012

India has a climate much influenced by the ocean. The knowledge of currents (especially coastal ones), their intensity, direction, how they are generated (and when) is of foremost importance for the whole country.
The satellites show that upwelling occurs along the South West coast of India in May-September, as seen in the low sea level anomalies and the high average chlorophyll fields in August, disappearing by December.

Using the full nearly twenty-years time series of altimeter data, in correlation with model winds from  ECMWF indicates that local/regional winds along western India are strongly correlated with the low SLA signal associated with upwelling in the West India Coastal Current. This suggests that local winds are more important than distant ones for this upwelling. In contrast, the strong downwelling signal (high coastal SLA) that develops in the West India Coastal Current during November-December is not correlated with the local-regional winds, originating instead along the Bay of Bengal coasts or Equator, which is consistent with previous studies.
The use of the 19-year time series gives us greater confidence in the results of the correlation analysis.

The continuity of the altimetry series of measurements, especially with the French-Indian SARAL satellites enable a better understanding, and thus potentially the forecasting of the ocean around India.

See also:


  • Dhage, L., T. Strub, T. Durland, R. Matano, Y. K. Somayajulu, 2012. A 20-Year satellite climatology of ocean circulation in the Northern Indian Ocean. Procedings of the 20-Years of Progress in Radar Altimetry Symposium, Venice, Italy. 
  • Rao, R.R., Girish Kumar, M.S., Ravichandran, M., Rao, A.R., Gopalakrishna, V.V. and Thadathil, P. (2010), Interannual variability of Kelvin wave propagation in the wave guides of the equatorial Indian Ocean, the coastal Bay of Bengal and the southeastern Arabian Sea during 1993-2006, Deep-Sea Res (114), I:57, 1-13
Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
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

This 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!