Research Paper: Sea Ice Drift

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Sea ice Drift Sea-ice is one of the fastest reacting, most dynamic geophysical parameter on the Earth’s Surface. The dynamisms of it strongly affects the global climate hence making it an important environmental element in the global climate system throughout history. (Hanna, 1996) It can act as an insulating blanket which would affect/limit the exchange of gas, energy and vapour between atmosphere and ocean. The presence of sea-ice can also cause a positive feedback to occur in terms of albedo. (Crosta et al, 2007) Sea-ice is able to affect the global thermohaline circulation and influence deep water formation. Deep water formation is influence by sea ice through injection of brine or salts during freezing events in the winter season and freshwater formation(melting) during summer-spring seasons.(Bryan et al, 1975) Sea-ice favours diatoms over organic-walled micro-organisms that release large of carbon to the sea-floor. Thus it can also be concluded that sea-ice also influces the primary and export productivity of the ocean.(Vaillencourt et al, 2003) This was also statement was also evident in both Crosta et al, 2007 and Gersonde and Zielinski, 2000. Thus showing that maybe sea-ice and the westerlies might be inter-related. Figure11. Schematic presentation of the main sea-ice environmental and climatic influences.(Gersonde and Zielinski, 2000) As it can be seen, sea-ice plays a huge role in global climate control(as seen in Figure11, paragraph above and shifting westerlies section) thus there is a crucial need to consider sea-ice reconstruction of climatic evolution during the geological past to further understand them and also to determine what was the past climate, and shape of the polar regions. To reconstruct the polar ... ... middle of paper ... ... condition respectively. Dinocyst and planktonic foraminiferal isotopes data were able to conclude that Arctic and Western Europe had suffered retardation of the North Atlantic Circulation. Norgaard-Pedersen et al., 2003 had done a multiproxy analysis of LGM sea ice conditions in the Fram Strait and Central, Eastern Arcic. A combination of sediment composition and flux rates of iceberg rafting and planktonic foraminiferal abundance and isotopic data was used. It showed eastern Fram Strait and northern Barents Sea had spatial similarity in sea ice and seasonal ice cover. While in the central Arctic Basin, it had produced results showing perennial ice cover. Another work done by Sarnthein et al., 2003 showed that ice-free Nordic seas were correlated with North Atlantic Glacial Summers and while extension of sea ice south of Iceland were correlated with winter events.
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