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Dominant Roll of Eddy in Offshore Transports
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R̃N[[@AJC݂ɂcɒJtHjAB̖̂Ȃl͏ȂƎv܂BJtHjA݂͐ɑm]݁A݉̓g[g1͕îŃhCuR[XƂĂLłBTtVXR烍T[X֓쉺ƂɃg[p̂Ő^Ă߂͒N̗ɋ͂łBāAJtHjA݂ł͔ɗ₽CAV[u[YAܓxɂ铌Ƃׂ͔Ȃ₷łBȂȎR̃N[[̂ł傤H @͂ɂ́A݂ŋNNWĂ܂BďAJtHjAł͖kA܂BɔCʂ̗͕̐45xkŎvɂė܂B́An̎]ɔ݂̗́ARI͂^Ɋ֗^邩łBCʂ班͖̐C͂ɂē悤ȕɈ܂ACʂ̗̕炳Ɏvɗ̕]܂B]̓x́Aɂ݂̖C̒xFQSW̕ω̎dɂĈقȂ܂A[ȂɂĂǂǂvɉĂA܂ɂ͊Cʂ̗̔ɗw܂Aꂪł̂͊CʂŁA[ȂɂďXɎキȂĂ܂BCm\wɂ͍wƌĂ閧xقڈ̑w݂ĂẢ̑wł͐[Ȃɂċ}ɖx߁ARQSWȂȂ܂B̂悤ȑwł́A̕̕ωRȂ܂B̂悤ɕɔ͈ꌩGłAcɐϕƑŜ̗̐Ǎ͕ƒp90x̕ɂȂ邱Ƃ_Iɂ킩Ă܂BāAJtHjẢ݂ċGɐkɔC̗A͐ŐϕƐɂȂ邱Ƃ킩܂Bł̊C̗AS̓Iɐ֍sĂƂ̂łBƂŊ߂̐͐֗邱Ƃłł傤H݂̋߂݂̐痣ł鐼ֈĂɗAꂽAȂȂă[[CɊƂƂȂ悤ɂȂĂ܂܂Hۂɂ͐ȂȂOɋ߂悤ɂǂ炩Ă܂Bw̗₽݂ɉĕ\ŵłB̗₽R̃N[[̐̂łB
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tg͉̗AɂƂĎזHʼnQ͂ȂɂĂ̂ĂQ|gƂĐ֗|Dominant Roll of Eddy in Offshore TransportsThe coastal upwelling region of the California Current System (CCS) is a well known site of high productivity. In this study, we quantify the fluxes of carbon and associated nutrient elements in the CCS in a high-resolution (5 km) coupled physical-biogeochemical numerical simulation (ROMS) for the U.S. West Coast with special emphasis on offshore transport. A Reynolds decomposition analysis of the lateral fluxes reveals that eddies rather than the offshore Ekman transport dominate the offshore carbon transport. Hovmoeller diagrams of state variables for inorganic constituents show westward propagation in their concentrations with a speed similar to the baroclinic Rossby wave, 2 cms$^{-1}$. In summer, the narrow and cool filaments extending from the coast tend to eventually form mesoscale cyclonic eddies in the frontal region ($\sim$200 km from the coast). In this process, plumes of upwelled water, which includes abundant organic matter and inorganic constituents rapidly penetrates to the offshore. A rapid subduction of surface tracers are observed at the edge of cold filaments where strong confluent flows exist, enhancing export production. The filaments of upwelled water are finally trapped into the cyclonic eddies, which then travel westward as the Rossby waves and promote further offshore transports up to $\sim$800 km from the coast. We estimate that $\sim$60-70\% of the offshore transports in the $\sim$200-800 km range is caused by these westward propagating eddies. |
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Research |
Last Update 09/16/2007