User:Amryan11/warm core ring sandbox
 The track of Hurricane Katrina is shown passing over a warm core ring. Note that it intensifies to Category 5 strength as it passes over the ring. | |
| Attributes | |
|---|---|
| Surface Area | 100-300 km |
| Depth | up to 1.5 km |
| Speed | 2-5 km/day |
| Occurance | 10-15/year |
A warm core ring is a type of mesoscale eddy which breaks off from the Gulf Stream, creating an independent circulatory system of warm water which can sustain itself for several months.[1] Such rings can be detected using infrared satellites or sea height anomalies and are easily identifiable against the surrounding colder waters. These systems will drift west from their origin at the Gulf Stream until they break apart on the coastal shelf or are reabsorbed by the Gulf Stream.
This type of system is theorized to have helped develop several hurricanes, most notably Hurricane Katrina, into significantly stronger storms due to the abundance of warmer ocean water reaching down to a significant depth.[2] In addition, these eddies can damage offshore drilling equipment due to their currents.
Warm core rings are also known for affecting wildlife, bringing warm-water creatures to unusual areas.
Formation and Movement
[edit]
Formation
[edit]As the Gulf Stream flows and moves over time, it can develop large loops which can eventually be pinched off from the current, forming an independent eddy of warmer Sargasso Sea water[3] circulating clockwise similar to the direction of the Gulf Stream.[4] While many warm core rings are created in the Gulf of Mexico, they can develop anywhere along the eastern coast of the United States north of the Gulf Stream.[3] Rings are anywhere from 100-200 km across and can include warmer waters as deep as 1500 meters.[3] These rings develop every 6-11 months on average.[4] However, rings in the Gulf of Mexico can last much longer and are formed at much more irregular intervals than along the eastern U.S. coast.[3] In an active year, up to 15 warm core rings can form due to the Gulf Stream.[1]
Movement
[edit]Rings will drift to the west-southwest at 3-5 km/day for several months up to a year.[4] The rings always rotate clockwise due to the direction of the Gulf Stream and can reach rotational velocities of up to 1 m/s.[1] Usually warm core rings cannot move onto the continental shelf because they reach deeper than the seafloor on the shelf by over 1000 meters, though they can near the shelf.[3]
Disbanding
[edit]Warm core rings are often reabsorbed by the Gulf Stream, but they can break apart on their own as well if they move onto the continental shelf.[1]
Detection and Tracking
[edit]Warm core rings are easily observed in the Gulf of Mexico or elsewhere through the use of infrared imagery by weather satellites.[3] Since the ocean water temperature of the ring is significantly higher than the surrounding waters, these rings show up easily in infrared images. This, coupled with models of ring movement, allow well-developed tracking of the rings. Because warm core rings include warm water to a significant depth, infrared satellites can differentiate the temperature, unlike cold core rings, which cannot be easily detected.
Warm core rings are also detected by sea height anomalies. Since warm water takes up more space as it expands than cold water, the large amount of warm water causes an upwelling in sea height which can be detected by buoys.[5]
Adverse Effects
[edit]Intensification of Hurricanes
[edit]Warm core rings have been linked to the intensification of several hurricanes passing over their location. Because high sea surface temperature as well as warmer water at greater depth is the primary intensifier of a hurricane, warm core rings account for tremendous strengthening of these storms.
Notably, Hurricane Opal passed over a ring and had sudden increases of wind speed from 110 miles per hour to 135 miles per hour shortly before landfall, a trend also seen in Hurricane Allen and Hurricane Camille.[6] There is evidence that Hurricane Katrina and Hurricane Rita, both notable storms which reached Category 5 intensity, as well as Hurricane Ivan, were also strengthened by warm core rings.[4]
Effects on Wildlife
[edit]Warm core rings typically include far less biological specimens than the surrounding ocean. When the rings approach continental shelves, coastal currents are affected, which can cause organisms to drift onto the shelf that ordinarily would not be there. In fact, there are human accounts of sea turtles and tropical fish which normally live in much warmer waters coming near the coastal shelf due to the deep, warm waters of a warm core ring.[3]
Damages to Offshore Drilling
[edit]Due to currents around warm core rings of up to nearly 5 miles per hour, this phenomenon can damage offshore oil platforms and increase the risk of accidents.[3]
See also
[edit]References
[edit]- ^ a b c d "Coastal Carolina University's article on ring formation". College of Natural and Applied Sciences. Retrieved 20 April 2011.
- ^ Kafatos, Menas; Sun, Donglian; Gautam, Ritesh; Boybeyi, Zafer; Yang, Ruixin; Cervone, Guido (1 September 2006). "Role of anomalous warm gulf waters in the intensification of Hurricane Katrina" (PDF). Geophysical Research Letters. 33 (17). doi:10.1029/2006GL026623. S2CID 54490765. Retrieved 27 April 2011.
- ^ a b c d e f g h "Wind Driven Surface Currents: Rings". NASA. Retrieved 20 April 2011.
- ^ a b c d Masters, Jeffrey (2011). "The Gulf of Mexico Loop Current: A Primer". Weather Underground, Inc. Retrieved 20 April 2011.
- ^ "Remote Sensing of the Oceans". Rutgers University. Retrieved 29 April 2011.
- ^ Kalmanson, Dan (28 October 1999). "Ocean "Fuel Injectors" Linked to Hurricane Intensification". University of Miami/NASA. Retrieved 23 April 2011.