开封市一次农业机械麦收过程激光雷达观测研究  

Observation of Wheat Harvesting Process by Lidar in Kaifeng City

作　　者：王碧菡 康暑雨 霍继超 Wang Bihan;Kang Shuyu;Huo Jichao(Kaifeng Meteorological Service,Kaifeng 475004,China)

机构地区：[1]开封市气象局,河南开封475004

出　　处：《环境科学与管理》2024年第8期112-117,共6页Environmental Science and Management

基　　金：河南省农业气象保障与应用技术重点实验室面上项目(KM202141);开封市科技研发计划联合基金项目(22LH005)。

摘　　要：利用气溶胶激光雷达于2021年6月上旬麦收期在开封市开展走航和定点观测,结合气象和空气质量数据,对麦收前后气溶胶时空分布特征和颗粒物浓度展开分析。结果表明:麦收前近地面以细颗粒物为主,消光系数大值区位于1.4 km以下,最大值达到0.41 km^(-1);麦收时近地面以粗颗粒物为主,走航区域1 km以下退偏比超过0.2,小麦收割区内部退偏比值超过0.5,风速6~7 m·s^(-1)时PM 10可沿下风方向传输700米后逐渐向上空扩散,风速下降至1 m·s^(-1)会导致直线距离1700米范围内PM 10浓度显著升高。该结果可以为农业生产对空气质量影响评估以及环境治理工作提供科学数据。Aerosol Lidar was used to conduct navigation and fixed point observation in Kaifeng City during wheat harvest in early June 2021.Combined with meteorological and air quality data,the spatial and temporal distribution characteristics of aerosol and particulate matter concentration before and after wheat harvest were analyzed.The results showed that there were mainly fine particles near the ground,the extinction coefficient was less than 1.5 km,the maximum value was 0.41 km^(-1) before mechanical wheat harvesting.Coarse particles were mainly near the ground,and the depolarization ratio was more than 0.2 below 1 km in most navigation areas during wheat harvesting.The inner depolarization ratio of wheat harvesting area was more than 0.5.PM_(10) can be transmitted downwind for 700 m and then gradually diffused into the sky.When the wind speed dropped to 1 m·s^(-1),the PM_(10) concentration increased significantly within the linear distance of 1700 m.The results can provide scientific data for the assessment of the impact of agricultural production on air quality and environmental management.

关 键 词：消光系数 退偏比 PM_(10) 激光雷达走航 开封 

分 类 号：X831[环境科学与工程—环境工程]