水平能见度

雾霾神经网络模型对水平能见度小于1km雾的预报好于事件概率回归预报模型。

BP Neural Network model is better for fog which horizontal visibility less than lkm .

选用了水平能见度小于1000m的低能见度作为影响城市交通运输的一个指标，并研究了低能见度在北京地区时空分布特征。

The temporal and spatial distribution characteristics of the low horizontal visibility ( lower than 1000 m ) in Beijing are studied , which is chosen as an index that would affect urban traffic and transportation .

另外笔者认为AOD与水平能见度之比值能够较全面地考虑水平和垂直两个方向的要素变化，衡量沙尘天气强度更具有合理意义，值得更深一步的探讨。

In addition , the authors considered that the ratio of AOD to visibility could roundly reflect the factor change in both horizontal and vertical directions , so it was reasonable to measure the intensity of dusty weather .

通过实际观测并与美国Belfort能见度仪的对比试验，显示该激光雷达在探测大气水平能见度方面具有较高的可靠性和准确性，其测量误差小于20%。

A practical experiment is conducted in Mianyang and the result is compared with that by Belfort visibility sensor . The results show that RML lidar has high reliability and is precise . The error of the measurement is less than 20 % .

微脉冲激光雷达测量大气水平能见度

Visibility measurement over the horizontal path by means of micro - pulsed lidar

光学厚度与地面水平能见度不呈简单的对应关系。

There is no simple one-to-one correspondence between optical depth and surface horizontal visibility .

水平能见度经验公式在青岛沿海地区的应用

Studies on the Application of Empirical Formulae to the Calculation of Horizontal Visibility in Qingdao Coastal Area

本文还探讨了大气气溶胶光学厚度与水平能见度以及沙尘天气之间的关系。

The relationships between atmospheric aerosol optical thickness and horizontal visibility as well as the dusty weather were discussed .

一年中主要污染段是1月和11、12月，污染日占全年的49%。在污染日，大气水平能见度具有明显的日变化，能见度最差，污染最严重的时间是11～14时。

In pollution days , the visibility has distinct daily variation , the shortest distance of visibility and the most serious pollution phase are from 11:00 to 14:00 .

实验结果表明，在水平能见度较差时，微脉冲激光雷达和能见度仪具有很高的相关性，相关系数达到了0.88；在水平能见度较好的时候，相关系数保持在0.73以上。

The results indicate both has a high correlation coefficient up to 0.88 when the visibility is poor or moderate and the their correlation coefficients are above 0.73 in good visibility conditions , which indicates it is feasible for micro-pulsed lidars to measure the visibility .

实验结果表明，经过一定的对比和标定，该系统可直接用来测量、监测白天大气的消光系数或水平气象能见度。

The results show that this system can directly be used in monitoring and measuring daytime atmospheric extinction coefficient or horizontal visibility , as the system is calibrated correctly .

针对不良能见度天气下的交通运输安全需求，设计了一台可用于水平及斜程能见度测量的激光雷达能见度仪。

Aiming at the safety requirement for the traffic and transportation under bad visibility weather , a lidar visibility meter is designed to measure the horizontal and slant visibility .