辽宁环渤海地区非均匀下垫面夏季近地层微气象特征分析

Analysis of Micrometeorological Characteristics of Inhomogeneous Underlying Surface in the Bohai Coastal Region of Liaoning Province in Summer

摘要: 本文利用锦州农田玉米地、盘锦芦苇湿地通量观测站2015年8月1日至2015年8月31日的观测数据，分析了辽宁环渤海地区不同下垫面的微气象特征。主要得到以下结论：两地区局地小气候差异明显，锦州玉米旱地昼夜温差较大且相对湿度较低，盘锦芦苇湿地夏季土壤湿度接近饱和状态，锦州玉米旱地5 cm和10 cm土壤湿度月均值分别为0.18 m³/m³和0.20 m³/m³。两通量站各层土壤温度均呈准正弦变化，盘锦芦苇湿地由于地表有水体灌溉，热容量较大，土壤温度较低。两站点均以偏南风为主导风，风向日变化呈明显的海陆风变化特征；夏季时，两地区地表和大气之间的能量输送均以潜热输送为主。本研究依旧存在能量不闭合的问题，锦州玉米旱地通量站的能量闭合度为0.76。

Abstract: In this paper, the micrometeorological characteristics on different underlying surfaces are analyzed in Bohai coastal region from August 1 to 31, 2015. The observation data of field corn in Jinzhou and wetland in Panjin flux sites are used to analyze. The main conclusions are as follows: the regional microclimate difference is obvious between Jinzhou and Panjin. The temperature difference value between day and night in Jinzhou dryland underlying surface is higher and the relative humidity is lower than Panjin wetland. The soil moisture in Panjin Wetland in summer is almost saturation. The monthly averaged values of soil moisture of 5 cm and 10 cm in Jinzhou dryland are 0.18 m³/m³ and 0.20 m³/m³ respectively. The soil temperature pattern of each layer is like quasi-sinusoidal at flux stations. Because of irrigation, there has large heat capacity and low soil temperature value at the Panjin wetland. The dominant wind direction is from the south in both sites, and there is obvious sea-land breeze change of wind direction in this area. In summer, the latent heat flux transfer is dominated in the two regions. In this study, there is still the problem of energy nonclosure. The energy closure rate of the Jinzhou dryland flux station is 0.76.