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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Velocity and transport of the Labrador Current determined from altimetric, hydrographic, and wind data
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Velocity and transport of the Labrador Current determined from altimetric, hydrographic, and wind data

机译：根据高程，水文和风力数据确定拉布拉多流的速度和传输

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摘要

Seasonal change of velocity and transport in the Labrador Current is studied using 3.5 years of TOPEX/Poseidon altimeter data, in conjunction with concurrent wind data and climatological density data. A method based on the linearized momentum equation is developed, in which vertically averaged velocities and volume transports normal to selected sections across the Labrador Sea are computed with the sea surface being the level of known motion measured by the altimeter. The three data sources have significantly different temporal and spatial scales, and thus a smoothing technique has been applied to ensure their consistency. Error analyses are performed to estimate the uncertainty in altimetric measurements and geophysical corrections and in density data. The seasonal range of the Labrador Current transport from the 300-m isobath seaward to the deepest ocean varies from 17 Sv at the Nain Section to 10 Sv at the Hamilton Section and 5 Sv at the northern Newfoundland Section, with a maximum in winter or fall and a minimum in spring. The barotropic effect associated with sea surface slope is most important over the shelf break and upper continental slope at the Nain and Hamilton Sections. At the northern Newfoundland Section the baroclinic effect associated with density gradients has a magnitude comparable with that of the barotropic effect. The largest baroclinic variability occurs offshore of the main density front over the lower continental slope of the Hamilton Section. The Ekman transport variability forced by local wind stress is negligible.
机译：使用3.5年的TOPEX / Poseidon高度计数据以及同期风数据和气候密度数据，研究了拉布拉多洋流中速度和输运的季节性变化。开发了一种基于线性动量方程的方法，其中计算垂直于拉布拉多海选定断面的垂直速度和体积输运，并以高度计测得的海平面为已知海平面。这三个数据源具有明显不同的时间和空间尺度，因此应用了平滑技术以确保其一致性。进行误差分析以估计高度测量和地球物理校正以及密度数据中的不确定性。拉布拉多目前从300米等压线向海到最深海域的运输季节范围从纳因段的17 Sv到汉密尔顿段的10 Sv和纽芬兰段的5 Sv不等，冬季或秋季最高春季最少。与海面坡度有关的正压效应在奈因和汉密尔顿剖面的陆架折断和上大陆坡上最为重要。在纽芬兰北部地区，与密度梯度有关的斜压效应的大小与正压效应相当。最大的斜压变化发生在汉密尔顿断面下大陆斜坡的主要密度锋的近海处。由局部风应力引起的埃克曼输运变异性可以忽略不计。

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