https://scholars.lib.ntu.edu.tw/handle/123456789/542339
標題: | Uncertainty in measured raindrop size distributions from four types of collocated instruments | 作者: | Chang, W.-Y. Lee, G. BEN JONG DAO JOU Lee, W.-C. Lin, P.-L. CHENG-KU YU |
公開日期: | 2020 | 卷: | 12 | 期: | 7 | 起(迄)頁: | - | 來源出版物: | Remote Sensing | 摘要: | Four types (2D-video disdrometer: 2DVD; precipitation occurrence sensor system: POSS; micro-rain radar: MRR; and Joss-Waldvogel disdrometer: JWD) of sixteen instruments were collocated within a square area of 400m2 from 16 April to 8 May 2008 for intercomparison of drop size distribution (DSD) of rain. This unique dataset was used to study the inherent measurement uncertainty due to the diversity of the measuring principles and sampling sizes of the four types of instruments. The DSD intercomparison shows generally good agreement among them, except that the POSS and MRR had higher concentrations of small raindrops (<1.0 mm) and offered a better chance to observe big raindrops (>5.2 mm). The measurement uncertainty (σ) was obtained quantitatively after considering the zero or non-zero measurement error covariance between two instruments of the same type. The results indicate the measurement uncertainties were found to be neither independent nor identical among the same type of instruments. The MRR is relatively accurate (lower σ) due to large sampling volumes and accurate measurement of the Doppler power spectrum. The JWD is the least accurate due to the small sampling volumes. The σ decreases rapidly with increasing time-averaging window. The 2DVD shows the best accuracy of R in longer averaging time, but this is not true for Z due to the small sampling volume. The MRR outperformed other instruments for Z for entire averaging time due to its measuring principle. © 2020, by the authors. |
URI: | https://www.scopus.com/inward/record.url?eid=2-s2.0-85084256684&partnerID=40&md5=037623dd93bba50852837b287fcf5fe3 https://scholars.lib.ntu.edu.tw/handle/123456789/542339 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084256684&doi=10.3390%2frs12071167&partnerID=40&md5=b26070f7e74cf345bb32d93863fea53b |
DOI: | 10.3390/rs12071167 |
顯示於: | 大氣科學系 |
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