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RAIN AND SUN CREATE SLIPPERY LAYERS IN THE EASTERN PACIFIC FRESH POOL

机译：雨和太阳在东太平洋新鲜游泳池中创造了湿滑的层

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摘要

An autonomous Lagrangian float equipped with a high-resolution acoustic Doppler current profiler observed the evolution of upper-ocean stratification and velocity in the Eastern Pacific Fresh Pool for over 100 days in August-November 2016. Although convective mixing homogenized the water column to 40 m depth almost every night, the combination of diurnal warming on clear days and rainfall on cloudy days routinely produced strong stratification in the upper 10 m. Whether due to thermal or freshwater effects, the initial strong stratification was mixed downward and incorporated in the bulk of the mixed layer within a few hours. Stratification cycling was associated with pronounced variability of ocean surface boundary layer turbulence and vertical shear of wind-driven (Ekman) currents. Decoupled from the bulk of the mixed layer by strong stratification, warm and fresh near-surface waters were rapidly accelerated by wind, producing the well-known "slippery layer" effect, and leading to a strong downwind near-surface distortion of the Ekman profile. A case study illustrates the ability of the new generation of Lagrangian floats to measure rapidly evolving temperature, salinity, and velocity, including turbulent and internal wave components. Quantitative interpretation of the results remains a challenge, which can be addressed with high-resolution numerical modeling, given sufficiently accurate air-sea fluxes.
机译：一种具有高分辨率声学多普勒电流分析器的自主拉格朗日浮子观察了东度新鲜游泳池上海中海分层和速度的演变，于2016年8月至11月10日。虽然对流混合均质化水柱至40米深度几乎每晚，昼夜变暖的结合在晴朗的日子里，降雨量在阴天上常规产生强大的分层10米。无论是由于热水还是淡水效果，初始强分层都在向下混合并在几小时内掺入混合层中。分层循环与海面边界层湍流和风力驱动（EKMAN）电流的垂直剪切有关。通过强烈的分层从混合层的大部分分离，暖和近表面水迅速加速，产生众所周知的“光滑层”效应，并导致ekman剖面的强烈下行近表面变形。案例研究说明了新一代拉格朗日浮子的能力，以测量快速发展的温度，盐度和速度，包括湍流和内部波部件。对结果的定量解释仍然是一个挑战，可以通过高分辨率数值模型来解决足够精确的空腹通量。

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  • 来源
    《Oceanography》 |2019年第2期|98-107|共10页
  • 作者

    Shcherbina Andrey Y.; DAsaro Eric A.; Harcourt Ramsey R.;

  • 作者单位

    Univ Washington Appl Phys Lab Seattle WA 98105 USA;

    Univ Washington Appl Phys Lab Seattle WA 98105 USA;

    Univ Washington Appl Phys Lab Seattle WA 98105 USA;

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