Researchers study currents that fuel hurricanes and transport pollutants to coastal beaches
As tropical storm Isaac was gaining momentum toward the Mississippi River in August 2012, University of Miami (UM) researchers were dropping instruments from the sky above to study the ocean conditions beneath the storm. The newly published study showed how a downwelling of warm waters deepened the storm's fuel tank for a rapid intensification toward hurricane status. The results also revealed how hurricane-generated currents and ocean eddies can transport oil and other pollutants to coastal regions.
Tropical storms obtain their energy from the ocean waters below. As a storm moves across the Gulf of Mexico, it may interact with an upwelling of cooler waters from the deeper ocean or, in the case of Isaac, a downwelling inside rings of warm water that separated from a warm-water current, called the Loop Current, that moves through the Gulf of Mexico to join with the Gulf Stream along the U.S. East Coast. As the storm moves forward, ocean temperatures are fueling the storm's intensity.
UM Rosenstiel School of Marine and Atmospheric Science researchers, in collaboration with NOAA's Atlantic Oceanographic and Meteorological Laboratory, deployed a total of 376 airborne sensors during six NOAA hurricane hunter aircraft flights conducted before, during, and after the passage of Isaac over the eastern Gulf of Mexico. The researchers observed a predominant downwelling of water inside these warm-water rings, or eddies, from the Loop Current, which caused its intensification from a tropical storm to a category 1 hurricane just prior to landfall.
"These results underscore the need for forecast models to include upwelling-downwelling responses to improve intensity forecasting and current transport," said Benjamin Jaimes, an assistant scientist at the UM Rosenstiel School.
"Isaac moved over the region of the Deepwater Horizon oil spill where we observed both upwelling and downwelling processes that can re-suspend hydrocarbons lying on the seafloor," said Nick Shay, professor of ocean sciences at the UM Rosenstiel School. "This may have resulted in tar balls being deposited on beaches by hurricane-generated currents."
Tropical storm Isaac gradually intensified in the Gulf of Mexico to reach category 1 hurricane status as an 80 mph (130 km/h) storm, making landfall along the coast of Louisiana. The storm was estimated to have caused $2.39 billion in damage along its track.
The study, titled "Enhanced Wind-Driven Downwelling Flow in Warm Oceanic Eddy Features during the Intensification of Tropical Cyclone Isaac (2012): Observations and Theory," was published in the June 2015 issue of the Journal of Physical Oceanography. The study's co-authors include: Benjamin Jaimes and Lynn "Nick" Shay of the UM Rosenstiel School of Marine and Atmospheric Science's Department of Ocean Sciences. BP/Gulf of Mexico Research Initiative to the Deep-C consortium at Florida State University supported the research.
About the University of Miami's Rosenstiel School
The University of Miami is one of the largest private research institutions in the southeastern United States. The University's mission is to provide quality education, attract and retain outstanding students, support the faculty and their research, and build an endowment for University initiatives. Founded in the 1940's, the Rosenstiel School of Marine & Atmospheric Science has grown into one of the world's premier marine and atmospheric research institutions. Offering dynamic interdisciplinary academics, the Rosenstiel School is dedicated to helping communities to better understand the planet, participating in the establishment of environmental policies, and aiding in the improvement of society and quality of life. For more information, visit: http://www.
Diana Udel | EurekAlert!
Hidden river once flowed beneath Antarctic ice
22.08.2017 | Rice University
Greenland ice flow likely to speed up: New data assert glaciers move over sediment, which gets more slippery as it gets wetter
17.08.2017 | Swansea University
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
23.08.2017 | Life Sciences
23.08.2017 | Life Sciences
23.08.2017 | Physics and Astronomy