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What is El Niño Taimasa? Strong El Niño events leading to lower local sea levels

Date:
February 20, 2014
Source:
University of Hawaii ‑ SOEST
Summary:
During a very strong El Niño, sea level can drop in the tropical western South Pacific and tides remain below normal for up to a year, especially around Samoa. Scientists are studying the climate effects of this variation of El Niño, naming it 'El Niño Taimasa' after the wet stench of coral die-offs, called 'taimasa' by Samoans.

This shows flat-top Porites coral on a shallow reef near American Samoa. Coral heads are fully submerged under normal conditions. During El Niño Taimasa, tops of large flat coral on the reef are exposed to air at low tide.
Credit: Image courtesy of the National Park of American Samoa

During very strong El Niño events, sea level drops abruptly in the tropical western Pacific and tides remain below normal for up to a year in the South Pacific, especially around Samoa. The Samoans call the wet stench of coral die-offs arising from the low sea levels "taimasa" (pronounced [kai' ma'sa]). Studying the climate effects of this particular variation of El Niño and how it may change in the future is a team of scientists at the International Pacific Research Center, University of Hawai'i at Mānoa and at the University of New South Wales, Australia.

Two El Niño Taimasa events have occurred in recent history: 1982/83 and 1997/98. El Niño Taimasa differs from other strong El Niño events, such as those in 1986/87 and 2009/10, according to Matthew Widlansky, postdoctoral fellow at the International Pacific Research Center, who spearheaded the study.

"We noticed from tide gauge measurements that toward the end of these very strong El Niño events, when sea levels around Guam quickly returned to normal, that tide gauges near Samoa actually continued to drop," recalls Widlansky.

During such strong El Niño, moreover, the summer rain band over Samoa, called the South Pacific Convergence Zone, collapses toward the equator. These shifts in rainfall cause droughts south of Samoa and sometimes trigger more tropical cyclones to the east near Tahiti.

Using statistical procedures to tease apart the causes of the sea-level seesaw between the North and South Pacific, the scientists found that it is associated with the well-known southward shift of weak trade winds during the termination of El Niño, which in turn is associated with the development of the summer rain band.

Looking into the future with the help of computer climate models, the scientists are now studying how El Niño Taimasa will change with further warming of the planet. Their analyses show, moreover, that sea-level drops could be predictable seasons ahead, which may help island communities prepare for the next El Niño Taimasa.


Story Source:

The above story is based on materials provided by University of Hawaii ‑ SOEST. Note: Materials may be edited for content and length.


Journal Reference:

  1. Matthew J. Widlansky, Axel Timmermann, Shayne McGregor, Malte F. Stuecker, Wenju Cai. An Interhemispheric Tropical Sea Level Seesaw due to El Niño Taimasa. Journal of Climate, 2014; 27 (3): 1070 DOI: 10.1175/JCLI-D-13-00276.1

Cite This Page:

University of Hawaii ‑ SOEST. "What is El Niño Taimasa? Strong El Niño events leading to lower local sea levels." ScienceDaily. ScienceDaily, 20 February 2014. <www.sciencedaily.com/releases/2014/02/140220095033.htm>.
University of Hawaii ‑ SOEST. (2014, February 20). What is El Niño Taimasa? Strong El Niño events leading to lower local sea levels. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2014/02/140220095033.htm
University of Hawaii ‑ SOEST. "What is El Niño Taimasa? Strong El Niño events leading to lower local sea levels." ScienceDaily. www.sciencedaily.com/releases/2014/02/140220095033.htm (accessed July 25, 2014).

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