Effects of diurnal cycle of surface heat flux on wind-driven flow
Effects of diurnal cycle of surface heat flux on wind-driven flow
复制标题
地表热通量日循环对风驱动流的影响
DOI：
10.1007/s10872-015-0328-y
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发表时间：
2016
影响因子：
2.3
通讯作者：
Y. Ide and Y. Yoshikawa
中科院分区：
文献类型：
--
作者：
田中健路;森井康宏;原 大祐; 橋本賢太郎;Y. Ide and Y. Yoshikawa
在中低纬度夏季晴朗的天气条件下，地表热通量的日循环已知会影响风驱动的流动。本研究调查在不同的风和天气条件下的日周期效应，与可变的加热时间，加热速率和冷却速率在一个为期1天，使用大涡模拟（LESs）。重点是给出的速度因子和偏转角的表面，这已被观察到的季节性变化在对马海峡的风驱动流。大涡模拟结果表明，即使在恶劣天气条件下，日周期对表面速度因子和偏转角的影响也是相当大的。当海面在白天被加热时，这种影响特别显著，而日平均加热率是大的和负的（强冷却），这在冬季是典型的。例如，LES的结果表明，在对马海峡的冬季日循环的速度因子的两倍，相对于没有这个周期，即使在相同的强加的每日平均表面热通量。LES结果还表明，观测到的速度因子和偏转角的季节性变化可以解释这些昼夜循环效应。为了阐明地表热通量日周期下的风驱动流动机制，还寻求了地表热通量日周期下的风驱动流动的解析解。这些结果表明，在广泛的天气条件下，地表热通量的日循环的重要性，为风驱动的流动。
The diurnal cycle of surface heat flux in summer fair weather conditions at mid- or low latitudes is known to affect wind-driven flow. The present study investigates diurnal cycle effects in various wind and weather conditions, with variable heating time, heating rate and cooling rate over a period of 1 day, using large-eddy simulations (LESs). Emphasis is given to the speed factor and deflection angle of the wind-driven flow at the surface, which have been observed to vary seasonally in the Tsushima Strait. The LES results show that diurnal cycle effects on the surface speed factor and deflection angle are considerable, even in non-fair weather conditions. The effects are particularly significant when the sea surface is heated during the daytime, while the daily mean heating rate is large and negative (strong cooling), which is typical in winter seasons. For example, the LES results show that the winter diurnal cycle in the Tsushima Strait doubles the speed factor relative to that without this cycle, even with the same imposed daily mean surface heat flux. The LES results also show that observed seasonal variations in speed factor and deflection angle can be explained by these diurnal cycle effects. Analytical solutions of the wind-driven flow are also sought under the diurnal cycle of surface heat flux in order to clarify the mechanism of the wind-driven flows under diurnal heat flux cycles. These results demonstrate the importance of the diurnal cycle of surface heat flux for wind-driven flow under a wide range of weather conditions.
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