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首页> 外文期刊>Canadian Water Resources Journal >Application of Weather Radar in Estimation of Bulk Atmospheric Deposition of Total Phosphorus Over Lake Simcoe
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Application of Weather Radar in Estimation of Bulk Atmospheric Deposition of Total Phosphorus Over Lake Simcoe

机译：天气雷达在估算西姆科湖总磷大量大气沉积中的应用

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The decline of Lake Simcoe water quality has been attributed to high phosphorus inputs that result in excessive algae and macrophyte growth subsequently contributing to end-of-summer hypolimnetic dissolved oxygen depletion and loss of fish habitat. Out of the estimated 53 to 67 tonne/annum (1998 to 2004 water years) of phosphorus entering the lake, atmospheric deposition is believed to be responsible for 16 to 38 tonne/annum. Historical estimates for atmospheric deposition involved averaging rain gauge (rainfall depth) and rain quality (phosphorus concentration) station data. Through use of this procedure, any spatial variability in the data (quality and quantity) is lost as each gauge is given an equal weighting. This study proposes a methodology to use Next Generation Radar (NEXRAD) to spatially represent rainfall data and a method to correct radar-rainfall estimates to rainfall recorded by local rain gauges. From this analysis it was found that the radar generally represented localized rainfall well, with the majority of correlation coefficients (R~2) being over 0.90. Radar related issues that resulted in poor R~2 values included virga, overshooting beam, beam attenuation, range related issues and ground clutter. For large bulk atmospheric total phosphorus (TP) deposition events the dominant parameter in calculating TP loads was rainfall depth. Results from this analysis demonstrated a large (-88% to +44%) difference between historical and revised estimates of bulk atmospheric deposition of phosphorus over Lake Simcoe.
机译：Simcoe湖水质下降的原因是磷输入量过多，导致藻类和大型植物的过度生长，进而导致夏季末低通量溶解氧的消耗和鱼类栖息地的丧失。据估计，进入湖泊的磷年产量为53至67吨/年（1998年至2004年水年），其中大气沉积量为16至38吨/年。大气沉积的历史估计包括平均雨量计（降雨深度）和雨水质量（磷浓度）站数据。通过使用此过程，数据的任何空间变化（质量和数量）都将丢失，因为每个量规都具有相等的权重。这项研究提出了一种使用下一代雷达（NEXRAD）在空间上表示降雨量数据的方法，以及一种针对当地雨量计记录的降雨量校正雷达降雨估计的方法。从该分析中发现，雷达通常代表局部降雨良好，大多数相关系数（R〜2）都超过0.90。导致R〜2值较差的与雷达相关的问题包括virga，过冲波束，波束衰减，与范围相关的问题和地面杂波。对于大块的大气总磷（TP）沉积事件，计算TP负荷的主要参数是降雨深度。这项分析的结果表明，历史和经修订的辛科湖上大气磷的总体沉积估算值与修订估算值之间存在较大差异（-88％至+ 44％）。

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