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首页> 外文期刊>Journal of Physical Oceanography >Ventilation and Transformation of Labrador Sea Water and Its Rapid Export in the Deep Labrador Current
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Ventilation and Transformation of Labrador Sea Water and Its Rapid Export in the Deep Labrador Current

机译：拉布拉多深海中的拉布拉多海水通气，转化和快速出口

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摘要

A model of the subpolar North Atlantic Ocean is used to study different aspects of ventilation and water mass transformation during a year with moderate convection intensity in the Labrador Sea. The model realistically describes the salient features of the observed hydrographic structure and current system, including boundary currents and recirculations. Ventilation and transformation rates are defined and compared. The transformation rate of Labrador Sea Water (LSW), defined in analogy to several observational studies, is 6.3 Sv (Sv ≡ 10~6 m~3 s~(-1)) in the model. Using an idealized ventilation tracer, mimicking analyses based on chlorofluorocarbon inventories, an LSW ventilation rate of 10 Sv is found. Differences between both rates are particularly significant for those water masses that are partially transformed into denser water masses during winter. The main export route of the ventilated LSW is the deep Labrador Current (LC). Backward calculation of particle trajectories demonstrates that about one-half of the LSW leaving the Labrador Sea within the deep LC originates in the mixed layer during that same year. Near the offshore flank of the deep LC at about 55°W, the transformation of LSW begins in January and is at a maximum in February/March. While the export of transformed LSW out of the central Labrador Sea continues for several months, LSW generated near the boundary current is exported more rapidly, with maximum transport rates during March/April within the deep LC.
机译：在北拉布拉多海中度对流强度较高的一年中，使用亚极地北大西洋模型研究通风和水质转换的不同方面。该模型真实地描述了观测到的水文结构和水流系统的显着特征，包括边界水流和回流。定义和比较通风率和转化率。与若干观测研究相似，拉布拉多海水（LSW）的转化率在模型中为6.3 Sv（Sv≡10〜6 m〜3 s〜（-1））。使用理想的通风示踪剂，根据氯氟烃清单进行模拟分析，发现LSW通风速率为10 Sv。对于在冬季部分转变为较稠密水团的那些水团，这两个比率之间的差异尤为重要。通风的LSW的主要出口路线是深拉布拉多洋流（LC）。对粒子轨迹的向后计算表明，在同一年内，离开深水域内的拉布拉多海的LSW约有一半来自混合层。在大约55°W的深部LC的近海侧面附近，LSW的转换从1月开始，在2月/ 3月达到最大。尽管从拉布拉多海中部出口的LSW持续出口数月，但边界流附近产生的LSW出口速度更快，3月/ 4月在深海LC内的运输速度最大。

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