Enhanced Turbulence Associated with the Diurnal Jet in the Ocean Surface Boundary Layer
Enhanced Turbulence Associated with the Diurnal Jet in the Ocean Surface Boundary Layer
复制标题
与海洋表面边界层中的昼夜急流相关的增强湍流
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
B. Ward
中科院分区：
文献类型：
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作者：
G. Sutherland;L. Marié;G. Reverdin;K. Christensen;G. Broström;B. Ward
摘要 2012 年 8 月和 9 月在副热带大西洋获得了对日急流的详细观测，日急流是与海面温度 (SST) 昼夜周期相关的风驱动流的表面强化。观察到 SST 日间增加 0.2° 至 0.5°C，这对应于 0.15 m s−1 的日急流。近地表层结的增加限制了风应力的垂直扩散，这反过来又增加了近地表切变。虽然分层降低了日间急流深度以下的湍流耗散率 e，但观察到日间急流内的 e 有所增加。据观察，昼夜喷射使近地表剪切力增加了 5 倍，这与 e 的增强值一致。作为剪切不稳定指标的理查森数的日演化小于 1，表明剪切不稳定可能会导致近地表湍流。虽然由于分散而增加了分层...
AbstractDetailed observations of the diurnal jet, a surface intensification of the wind-driven current associated with the diurnal cycle of sea surface temperature (SST), were obtained during August and September 2012 in the subtropical Atlantic. A diurnal increase in SST of 0.2° to 0.5°C was observed, which corresponded to a diurnal jet of 0.15 m s−1. The increase in near-surface stratification limits the vertical diffusion of the wind stress, which in turn increases the near-surface shear. While the stratification decreased the turbulent dissipation rate e below the depth of the diurnal jet, there was an observed increase in e within the diurnal jet. The diurnal jet was observed to increase the near-surface shear by a factor of 5, which coincided with enhanced values of e. The diurnal evolution of the Richardson number, which is an indicator of shear instability, is less than 1, suggesting that shear instability may contribute to near-surface turbulence. While the increased stratification due to the diu...
影响因子：
5.2
作者：
Belcher, Stephen E.;Grant, Alan L. M.;Polton, Jeff A.
通讯作者：
Polton, Jeff A.