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!
New insights into the ancestors of all complex life
29.05.2017 | University of Bristol
A 3-D look at the 2015 El Niño
29.05.2017 | NASA/Goddard Space Flight Center
The world's highest gain high power laser amplifier - by many orders of magnitude - has been developed in research led at the University of Strathclyde.
The researchers demonstrated the feasibility of using plasma to amplify short laser pulses of picojoule-level energy up to 100 millijoules, which is a 'gain'...
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
29.05.2017 | Earth Sciences
29.05.2017 | Life Sciences
29.05.2017 | Physics and Astronomy