Turbulent Vertical Velocities in Labrador Sea Convection

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
L. Clément, L. Merckelbach, E. Frajka-Williams
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引用次数: 0

Abstract

Turbulent vertical velocity measurements are scarce in regions prone to convection such as the Labrador Sea, which hinders our understanding of deep convection dynamics. Vertical velocity, w $w$ , is retrieved from wintertime glider deployments in the convective region. From w $w$ , downward convective plumes of dense waters are identified. These plumes only cover a small fraction of the convective area. Throughout the convective area, the standard deviation of w $w$ agrees with scaling relations for the atmospheric surface and boundary layers. It initially depends on surface buoyancy loss in winter, and later, on wind stress after mid-March. Both periods are characterized by positive turbulent vertical buoyancy flux. During convective periods in winter, the positive buoyancy flux is mostly forced by surface heat loss. After mid-March, when buoyancy loss to the atmosphere is reduced, the positive buoyancy flux results from a restratifying upward freshwater flux, potentially of lateral origins and without much atmospheric influence.

Abstract Image

拉布拉多海对流中的湍流垂直速度
在拉布拉多海等易发生对流的地区,湍流垂直速度测量数据很少,这妨碍了我们对深层对流动力学的了解。垂直速度 w$w$ 是通过对流区域的冬季滑翔机布放获取的。根据 w$w$,可以确定高密度水体的向下对流羽流。这些羽流只覆盖对流区域的一小部分。在整个对流区域,w$w$ 的标准偏差与大气表层和边界层的比例关系一致。它最初取决于冬季的表面浮力损失,后来取决于三月中旬以后的风压。这两个时期的特点都是正湍流垂直浮力通量。在冬季的对流期,正浮力通量主要由地表热损失所驱动。3 月中旬以后,大气中的浮力损失减少,正浮力通量来自于限制性上升淡水通量,可能来自于横向通量,而不受大气影响。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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