热带海洋环境中600米路径上湿度对C_n^2的贡献
Humidity contribution to C_n^2 over a 600m pathlength in a tropical marine environment
摘要：
我们提出了新的光学湍流结构参数的测量，C_n^2，在海水之间的La Parguera和Magueyes岛（17.6 N 67 W）的波多黎各西南海岸。600米的水平路径位于海拔约1.5米和10米处。文献中从未提供过此类数据。根据这些数据，我们发现C_n^2测量值比同等陆地数据小7倍。这个强有力的证据加强了我们先前的论点，即必须考虑湿度才能更好地确定近地表大气湍流的影响，而目前的可见光/近红外Cn ^2体模型无法做到这一点。我们还探讨了广义分形维数的沿海数据，并将其与我们的参考土地数据。我们发现的情况下，表现出单分形特征，也就是说，在白天的湍流时，温度上升的影响被湿度抵消，导致一个单一的特征尺度的测量。换句话说，测量体积中的显著水分变化抵消了由于温度上升而导致的光学湍流增加。数字仅以JPG格式提供。
英文摘要：
We present new optical turbulence structure parameter measurements, C_n^2, over sea water between La Parguera and Magueyes Island (17.6N 67W) on the southwest coast of Puerto Rico. The 600 meter horizontal paths were located approximately 1.5 m and 10 m above sea level. No data of this type has ever been made available in the literature. Based on the data, we show that the C_n^2 measurements are about 7 times less compared to equivalent land data. This strong evidence reinforces our previous argument that humidity must be accounted for to better ascertain the near surface atmospheric turbulence effects, which current visible / near infrared C_n^2 bulk models fail to do. We also explore the generalised fractal dimension of this littoral data and compare it to our reference land data. We find cases that exhibit monofractal characteristics, that is to say, the effect of rising temperatures during the daylight hours upon turbulence are counterbalanced by humidity, leading to a single characteristic scale for the measurements. In other words, significant moisture changes in the measurement volume cancels optical turbulence increases due to temperature rises. Figures available as JPG only.
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