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结合激光雷达评估常规探空资料反演青藏高原混合层高度的适用性
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Journal Article
结合激光雷达评估常规探空资料反演青藏高原混合层高度的适用性
2017
Overview
利用微脉冲激光雷达探测资料,采用梯度法获取那曲地区夏季的混合层高度序列及日最大混合层高度;利用每日两次(08:00和20:00)的探空资料结合地面最大位温,采用气块法得到雷达探测对应日期的日最大混合层高度(MMH)。通过对比从不同资料得到的MMH,发现08:00探空反演结果与激光雷达结果有较好的一致性(相关系数R为0.85,均方根误差RMSE为0.30km,平均绝对误差MAE为0.25km,并通过显著性水平为0.95的t检验);20:00探空反演结果则与激光雷达结果偏差相对较大(R为0.84,RMSE为0.67km,MAE为0.54km,未通过t检验)。分析产生偏差的原因发现,探空时刻的残余层、前期的天气变化过程以及对流泡活动或强卷夹过程引起的混合层高度时空变化等都可能是导致20:00高度结果与激光雷达结果不一致的原因,使得20:00探空资料不适合进行最大混合高度的反演。位温廓线的日变化特征也会影响反演结果的准确性,导致08:00探空结果偏高,但可以通过统计订正做修正。
Publisher
Acta Scientiarum Naturalium Universitatis Pekinenis,北京大学物理学院大气与海洋科学系,北京 100871,中国人民解放军92914部队,临高 571820%北京大学物理学院大气与海洋科学系,北京,100871%上海市气象局,上海,201100
Subject
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