Subjects: Geosciences >> Geography submitted time 2024-04-29 Cooperative journals: 《干旱区研究》
Abstract： Based on data obtained from the Micro Rain Radar (MRR), OTT-PARSIVEL laser raindrop spectrometer, and Rain Gauge (RG) at Zeku Station, the applicability of the MRR in the plateau region was compared and examined for a precipitation weather process on September 17, 2021. The vertical variation characteristics of the MRR observation parameters and raindrop spectrum were investigated at different rain rates. Results show that the observed cumulative rainfall results of the MRR were consistent with those of the raindrop spectrometer and RG, and the MRR 200 m rain rate was highly associated with the raindrop spectrometer inversion value. At various levels of rainfall intensity, differences were found in the vertical distribution of precipitation parameters. Reflectivity, rain rate and liquid water content were affected by evaporation, and they fluctuated from high to low levels in the Ⅰ stage of rain. The evaporation effect was weakened, and the peak height of each microphysical quantity was lower in the II stage of rain. The increase in particle diameter was due to the intensification of collision and coalescence, and the microphysical quantities increased with the decrease in height in the III stage of rain. Precipitation was dominated by small particles, and the raindrop number concentration contribution of small particles at each height layer was the largest. The contribution rate of 1000-4000 m small particles to the rain rate exceeded 90%, and the contribution rate of medium particles below 1000 m to the rain rate increased with the decrease of height. The contribution rate of large particles to the rain rate in the upper layer was greater than that in the lower layer.
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-11 Cooperative journals: 《干旱区研究》
Abstract：利用2013年青海省东部西宁站(08:00和20:00两个时次)探空观测资料和同址MP-3000A型微波辐射计反演数据，分析了该地区大气温度和相对湿度的垂直分布特征，讨论了微波辐射计的反演效果，并对温度偏差较大的月份进行偏差订正。结果表明：① 从高度来看，微波辐射计对低层温湿度反演明显优于高层。微波辐射计反演和探空探测年平均温度相关系数随高度上升基本呈现递减的趋势，最大在近地面，为0.988；最小在距地10 km处，为0.529，且通过了0.01水平的显著性检验。而年平均相对湿度相关系数仅3.0 km以下通过了0.01水平的显著性检验。② 从季节来看，春、夏、秋季温湿度的微波辐射计反演与探空吻合度明显好于冬季。春、夏、秋季温度相关系数均通过0.01水平的显著性检验。春、夏、秋季相对湿度的相关系数在地面到2.0 km处通过0.01水平的显著性检验，而冬季在1.5 km以下通过0.01水平的显著性检验。③ 应用订正方程对温度偏差较大的月份进行了偏差订正，效果较好。
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