This item has been filed in | News
Print This Post Print This Post

As the Climate Warms, the Indian Ocean’s Mighty Agulhas Current Widens


1 Star2 Stars3 Stars4 Stars5 Stars (No Ratings Yet)
Loading...Loading...
    The  Rosenstiel School Agulhas Current study has important implications for global climate.

    CORAL GABLES, Fla. (November 14, 2016)—A new study by researchers at the  Rosenstiel School of Marine and Atmospheric Science found that the Indian Ocean’s Agulhas Current is getting wider rather than strengthening. The findings, which have important implications for global climate change, suggest that intensifying winds in the region may be increasing the turbulence of the current, rather than increasing its flow rate.

    Using measurements collected during three scientific cruises to the Agulhas Current, the Indian Ocean’s version of the Gulf Stream, researchers estimated the long-term transport of the current leveraging 22 years of satellite data. They found the Agulhas Current has broadened, not strengthened, since the early 1990s, due to more turbulence from increased eddying and meandering.

    One of the strongest currents in the world, the Agulhas Current flows along the east coast of South Africa, transporting warm, salty water away from the tropics toward the poles. The Agulhas, which is hundreds of kilometers long and over 2,000-meters deep, transports large amounts of ocean heat and is considered to have an influence not only on the regional climate of Africa, but on global climate as part of the ocean’s global overturning circulation.

    “Changes in western boundary currents could exacerbate or mitigate future climate change,” said Lisa Beal, a UM Rosenstiel School professor of ocean sciences and lead author of the study. “Currently, western boundary current regions are warming at three times the rate of the rest of the world ocean and our research suggests this may be related to a broadening of these current systems.”

    Previous studies have suggested that accelerated warming rates observed over western boundary current regions, together with ongoing strengthening and expansion of the global wind systems predicted by climate models relate to an intensification and pole-ward shift of western boundary currents as a result of man-made climate change.

    “To find decades of broadening, rather than intensification, profoundly impacts our understanding of the Agulhas Current and its future role in climate change,” said study co-author Shane Elipot, a UM Rosenstiel School associate scientist. “Increased eddying and meandering could act to decrease poleward heat transport, while increasing coastal upwelling and the exchange of pollutants and larvae across the current from the coast to the open ocean.”

    This paper analyzed data collected during the “Agulhas Current Times-Series” experiment, led by Beal and funded by the National Science Foundation. The experiment produced continuous measurements of the Agulhas Current to better understand how the oceans are changing due to climate change.

    The study, titled “Broadening not strengthening of the Agulhas Current since the early 1990s,” was published November 9, in the Advance Online Publication of the journal Nature. The authors of the study are Beal and Elipot. DOI: 10.1038/nature19853. Funding was provided the US National Science Foundation, grant OCE-085089.

    Visit the University of Miami’s report on climate change,

    Comments are closed.

    • Related Stories
    • Tags
    • Popular
    • Subscribe
    • Subscribe to the Veritas RSS Feed
      Get updates to all of the latest Veritas posts by clicking the logo at the right.

      You can also subscribe to specific categories by browsing to a particular section on our site and clicking the RSS icon below each section's header.

    UM Facebook

    UM Twitter