Analysis And Numerical Simulation Of Summer Micro-meteorological Characteristics In The Bohai Rim Area Of ??Liaoning

Land-air interaction is very important to daily production and life.It is an important parameter to study climate change and an important indicator of ecosystem function.Based on the observation data of Jinzhou Farmland and Panjin Reed Wetland Flux Station from August 1,2015 to August 31,2015,this paper analyzed the micrometeorological characteristics of different underlying surfaces in the Bohai Rim of Liaoning Province.The simulation of WRF mesoscale meteorological model in the Bohai Rim region of Liaoning Province was evaluated by using observational data and GLDAS data.The main conclusions are as follows:(1)The local climate characteristics of the two flux observatories are obvious.The temperature difference between day and night at Jinzhou Maize Dryland Flux Station is large,and the maximum diurnal temperature difference can reach 15.5?;The monthly average of 2m relative humidity in the two regions is 74.77%and78.87%respectively.In summer,the southerly wind dominates the two stations,and the diurnal variation of wind direction shows obvious characteristics of land-sea wind;In summer,the soil moisture of Panjin Station is nearly saturated,the monthly mean of 5cm soil moisture of Jinzhou Station is 0.18m~3/m~3,and the monthly mean of10cm soil moisture of Jinzhou Station is 0.2m~3/m~3.The soil temperature of each layer of the two flux stations is quasi-sinusoidal,and the temperature of deeper layer is lagging behind that of shallow layer.The monthly mean of 5cm and 10cm soil temperature of Jinzhou Station is 24.4?and 23.9?,respectively.The soil temperature of 5cm and 10cm of Panjin Station is 23.89?and 23.59?,respectively.(2)The maximum downward shortwave radiation is 988W/m~2 in clear weather,the monthly average of upward shortwave radiation is 33.3W/m~2,and the diurnal variation peak of downward shortwave radiation is about 800W/m~2 in Panjin area;In summer,latent heat is the main energy transfer between surface and atmosphere.The average sensible heat flux of Jinzhou farmland underlying surface is 26.21W/m~2,and the average latent heat flux is 69.99W/m~2.The average sensible heat flux of Panjin reed wetland underlying surface is 13.35W/m~2 and the average latent heat flux is96.62W/m~2.The energy closure of Jinzhou Maize Dryland Flux Station is 0.76.(3)The WRF model has a good effect on the 2m temperature,2m relative humidity and wind direction in the Bohai Rim region of Liaoning,and the correlation coefficient R between the temperature simulation result and the observed value is greater than 0.94.The experiments can accurately simulate the variation of the dominant wind direction and wind speed in the simulated area.For winds other than the dominant wind direction,the wind speed simulation value is large.The sensible heat simulation value is low,the latent heat simulation value is high,and the energy is not closed.The WRF model has a good simulation effect on the basic meteorological elements in the whole region,and can better show the regional distribution of temperature,humidity and surface temperature in the Bohai Rim region of Liaoning.The model can well reflect the temperature and the relative humidity in the simulated area.