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Measurements of the Turbulent Oceanic Boundary Layer under Sea Ice

海冰下湍流海洋边界层的测量

基本信息

批准号：
02640312
负责人：
SHIRASAWA Kunio
金额：
$ 1.02万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640312/
关键词：
Ice-Ocean Interface Turbulent Oceanic Boundary Layer Momentum Flux Heat Flux Salt Flux Sea Ice Growing Process Seasonal Sea Ice Zone Polynya 海洋乱流境界層乱流強度

项目摘要

(1)Measurements were made of the three-dimensional current, temperature and salt regime in the frictional boundary layer under Landfast ice in southeast Hudson Bay during late April, 1990. Time series of currents, momentum, heat and salt fluxes were continuously recorded in the boundary layer during a diurnal tidal period by a three-dimensional ultrasonic current meter and a conductivity-temperature sensor. It was indicated that variations in current at higher frequencies than tides corresponded to those in momentum flux, and that the flow regime in the boundary layer might change intermittently from smooth to rough flow.(2)From turbulence measurements by a three-dimensional ultrasonic. anemometerthermometer estimates of momentum and heat fluxes were derived over both an artificial pool on the ice, approximately 2.2 x 2.2 m and over relatively smooth, snow-covered ice on Elson Lagoon, Alaska in May, 1991. It was indicated that the heat flux coefficient decreased after sea ice was formed on the pool, and that it then increased gradually with an increase in ice thickness. It can be considered that the measurements at 0.4 m height were made within the internal boundary layer over the pool, while those at the 0.96 m height might be affected by the smooth, snowcovered ice upwind of the experimental site.(3)Simultaneous measurements of both atmospheric and oceanic boundary layers through sea ice were made at an artificial pool, approximately 3 x 3 m on Saroma Lagoon, Hokkaido during mid-February to mid-March, 1992. Estimates of momentum, heat, CO2 and salt fluxes will be derived for both open water and thin ice on the pool in conjunction with ice growth. Those data have been in process of analysis.

(1)1990年4月下旬对哈德逊湾东南部Landfast冰下摩擦边界层的三维海流、温度和盐态进行了测量。利用三维超声海流计和电导率-温度传感器连续记录了日潮期间边界层中的海流、动量、热量和盐通量的时间序列。结果表明，潮汐频率较高的海流变化与动量通量的变化相对应，边界层的流态可能间歇性地从平滑流变为粗糙流。(2)三维超声波湍流测量。 1991 年 5 月，风速计温度计对冰上约 2.2 x 2.2 m 的人工水池和阿拉斯加埃尔森泻湖上相对光滑、被雪覆盖的冰上的动量和热通量进行了估计。结果表明，在水池上形成海冰后，热通量系数下降，然后随着冰厚度的增加而逐渐增加。可以认为0.4 m高度处的测量是在水池上方的内部边界层内进行的，而0.96 m高度处的测量可能受到实验场上风处光滑的积雪冰的影响。（3）2月中旬至3月中旬，在北海道佐吕间泻湖约3 x 3 m的人工池中通过海冰同时测量了大气和海洋边界层， 1992年。将对开放水域和池上薄冰以及冰生长的动量、热量、二氧化碳和盐通量进行估计。这些数据正在分析中。