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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Barrier layer (Oceanography) ： ウィキペディア英語版 Barrier layer (Oceanography) The Barrier layer in the ocean is a layer of water separating the well-mixed surface layer from the thermocline.〔Sprintall, J., and M. Tomczak, Evidence of the barrier layer in the surface-layer of the tropics, Journal of Geophysical Research-Oceans, 97 (C5), 7305-7316, 1992.〕 ==Barrier layer thickness (BLT)== The thickness of the barrier layer is defined as the difference between mixed layer depth (MLD) calculated from temperature minus the mixed layer depth calculated using density. The first reference to this difference as the barrier layer was in a paper describing observations in the western Pacific as part of the Western Equatorial Pacific Ocean Circulation Study.〔Lukas, R., and E. Lindstrom, The Mixed Layer of the Western Equatorial Pacific-Ocean, Journal of Geophysical Research-Oceans, 96, 3343-3357, 1991〕 In regions where the barrier layer is present, stratification is stable because of strong buoyancy forcing associated with a fresh lens sitting on top of the water column. In the past, a typical criterion for MLD was the depth at which the surface temperature cools by 0.2oC (see e.g. DT-02 in the Figure). Prior to the subsurface salinity available from Argo, this was the main methodology for calculating the oceanic MLD. More recently, a density criterion has been used to define the MLD, defined as the depth where the density increases from the surface value due to a prescribed temperature decrease of 0.2oC from the surface value while maintaining constant surface salinity value. In the Figure, this is defined by Dsigma and corresponds to an isothermal/isohaline layer. The BLT is the difference of the temperature-defined MLD minus the density-defined value (i.e. DT-02 - Dsigma). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Barrier layer (Oceanography)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.