Observations and modeling of heat fluxes on tidal flats
Observations and modeling of heat fluxes on tidal flats
复制标题
滩涂热通量的观测和建模
DOI：
10.1002/2013jc009225
复制
发表时间：
2014
影响因子：
--
通讯作者：
J. Thomson
中科院分区：
文献类型：
--
作者：
J. P. Rinehimer;J. Thomson
[1]发展了一个潮滩热量和质量通量的跨岸模型，以了解沉积物床和水柱之间的热交换。对流换热系数被用来模拟沉积物-水的热通量，其高达进入太阳短波辐射的20%。模式结果与观测值吻合得很好，并用于评估从潮汐到季节的时间尺度上的过程。在夏季，潮滩沉积物在暴露期间储存传入的短波辐射，并有效地作为水柱的净热源。这种模式在冬天会发生变化，当平底鞋在暴露期间变冷时，就会有效地起到净吸收热量的作用。此外，在夏季，洪水锋面边缘的水温比表层沉积物温度高出5℃。只有当水柱消光系数高时，模型结果才能重现这一过程，这与洪水前锋前沿高浑浊(因此高吸光)的目测结果一致。
[1] A cross-shore model of tidal flat heat and mass fluxes is developed to understand the heat exchange between the sediment bed and the water column. A convective heat-transfer coefficient is used to model sediment-water heat fluxes which are as great as 20% of the incoming solar shortwave radiation. The model results match well with observations and are used to assess processes across tidal to seasonal time scales. During the summer, tidal flat sediments store incoming shortwave radiation during exposure and act effectively as a net source of heat to the water column. This pattern changes in the winter, when the flats cool during exposure and act effectively as a net sink of heat. Additionally, during the summer water temperatures at the edge of the flooding front are elevated 5°C above the surface sediment temperatures. Model results replicate this process only when water column light extinction coefficients are high, consistent with visual observations of high turbidity (and thus high light absorption) at the leading edge of the flooding front.