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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Some Observational and Modeling Studies of the Atmospheric Boundary Layer at Mississippi Gulf Coast for Air Pollution Dispersion Assessment
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Some Observational and Modeling Studies of the Atmospheric Boundary Layer at Mississippi Gulf Coast for Air Pollution Dispersion Assessment

机译：密西西比州墨西哥湾沿岸大气边界层的观测和模拟研究用于空气污染扩散评估

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Coastal atmospheric conditions widely vary from those over inland due to the land-sea interface, temperature contrast and the consequent development of local circulations. In this study a field meteorological experiment was conducted to measure vertical structure of boundary layer during the period 25–29 June, 2007 at three locations Seabee base, Harrison and Wiggins sites in the Mississippi coast. A GPS Sonde along with slow ascent helium balloon and automated weather stations equipped with slow and fast response sensors were used in the experiment. GPS sonde were launched at three specific times (0700 LT, 1300 LT and 1800 LT) during the experiment days. The observations indicate shallow boundary layer near the coast which gradually develops inland. The weather research and forecasting (WRF) meso-scale atmospheric model and a Lagrangian particle dispersion model (HYSPLIT) are used to simulate the lower atmospheric flow and dispersion in a range of 100 km from the coast for 28–30 June, 2007. The simulated meteorological parameters were compared with the experimental observations. The meso-scale model results show significant temporal and spatial variations in the meteorological fields as a result of development of sea breeze flow, its coupling with the large scale flow field and the ensuing alteration in the mixing depth across the coast. Simulated ground-level concentrations of SO2 from four elevated point sources located along the coast indicate diurnal variation and impact of the local sea-land breeze on the direction of the plume. Model concentration levels were highest during the stable morning condition and during the sea-breeze time in the afternoon. The highest concentrations were found up to 40 km inland during sea breeze time. The study illustrates the application of field meteorological observations for the validation of WRF which is coupled to HYSPLIT for dispersion assessment in the coastal region.
机译：由于陆海界面，温度对比和随之而来的局部环流发展，沿海大气条件与内陆大气条件差异很大。在这项研究中，于2007年6月25日至29日在密西西比海岸的Seabee基地，Harrison和Wiggins的三个位置进行了边界层垂直结构的现场气象实验。实验中使用了GPS探空仪，慢速氦气球和配备有慢速和快速响应传感器的自动气象站。在实验期间，GPS探空仪在三个特定时间（0700 LT，1300 LT和1800 LT）启动。观测结果表明沿海附近的浅层边界层逐渐向内陆发展。天气研究和预报（WRF）中尺度大气模型和拉格朗日粒子弥散模型（HYSPLIT）用于模拟2007年6月28日至30日在距海岸100 km范围内较低的大气流量和弥散。将模拟的气象参数与实验结果进行了比较。中尺度模型结果表明，由于海风流动的发展，海风与大尺度流场的耦合以及随之而来的整个海岸混合深度的变化，气象领域的时间和空间存在显着变化。来自沿海岸的四个高位点源的二氧化硫的地面浓度模拟表明，昼夜变化和当地海陆风对羽流方向的影响。在稳定的早晨条件下和下午的海风期间，模型浓度水平最高。在海风吹袭时，在内陆40 km以内的浓度最高。这项研究说明了野外气象观测在验证WRF方面的应用，WRF与HYSPLIT结合用于沿海地区的色散评估。

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