Modeled Diurnally Varying Sea Surface Temperatures and Their Influence on Surface Heat Fluxes
Modeled Diurnally Varying Sea Surface Temperatures and Their Influence on Surface Heat Fluxes
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DOI：
10.1002/2013jc009489
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发表时间：
2014-07
影响因子：
--
通讯作者：
R. Weihs;M. Bourassa
中科院分区：
文献类型：
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作者：
R. Weihs;M. Bourassa
日变暖模式被用来建立一个新的全球海面温度和海面湍流热通量在5年期间的日变化数据集。日变暖的幅度主要是低风速和净热通量的函数。在每小时、每天和季节的时间尺度上，研究了有和没有海温日变化的每种地面湍流通量之间的差异。在两个月的时间里，印度洋的最大平均日增温高达0.3°C，潜热通量被低估了高达8W/m2。它们还分别超过约0.7摄氏度和10W/m2，高达大西洋白天总数的25%。最好的方法验证表明，该模型高估了峰值变暖，低估了周期的持续时间，尽管平均误差相当小。该模型在各种风速、太阳辐射和降水条件下进行测试，以检查输入数据中潜在偏差或误差的影响。为了测试正偏差对风速的影响，在近中性条件下，用调整后的风重新计算了日变暖幅度。与原始数据相比，在每小时尺度上，日增温可增加1.5摄氏度，但一般为0.06摄氏度。尽管与风和辐射相比，降水对dSST的影响较小，但模式配置错误地导致降水加剧了日增温，这与基本的模式物理相反。
A diurnal warming model is used to create a new data set of global, diurnally varying sea surface temperatures (dSSTs) and surface turbulent heat fluxes over a 5 year period. The magnitude of diurnal warming is primarily a function of low wind speed and net heat flux. Differences between each of the surface turbulent fluxes with and without a diurnally varying SST are examined on hourly, daily, and seasonal time scales. Over a 2 month period, maximum averaged diurnal warming is as large as 0.3°C, and latent heat flux is underestimated by as much as 8 W/m2 in the Indian Ocean. They also exceed roughly 0.7°C and 10 W/m2, respectively, up to 25% of the total daytime in the Atlantic. A best-case approach validation shows the model overestimates peak warming and underestimates the duration of the cycle, though the average error is quite small. The model is tested under a variety of wind speed, solar radiation, and precipitation conditions to examine the impact of potential biases or error in the input data. To test the impact of a positive bias in the wind speeds, diurnal warming magnitudes are recomputed with an adjusted wind under near-neutral conditions. Compared to the original data, diurnal warming can increase by as much as 1.5°C on an hourly scale but generally is <0.06°C. Although precipitation effects on dSSTs are small compared to winds and radiation, the model configuration wrongly causes diurnal warming to increase by precipitation, contrary to the underlying model physics.