Identification and Characterization of an Anomaly in Two-Dimensional Video Disdrometer Data
Identification and Characterization of an Anomaly in Two-Dimensional Video Disdrometer Data
复制标题
二维视频测速仪数据异常的识别和表征
DOI：
10.3390/atmos9080315
复制
发表时间：
2018
期刊：
影响因子：
2.9
通讯作者：
M. Schönhuber
中科院分区：
文献类型：
--
作者：
M. Larsen;M. Schönhuber
二维视频散射仪(2DVD)是一种众所周知的陆基点监测雨量计，经常被用作验证雷达或卫星降雨反演算法的地面实况仪器。该仪器记录了每一次探测到的水流星的许多变量，包括仪器样品区域内探测到的位置。对真实的2DVD数据的仔细分析揭示了一个假象--在样本区域的部分区域内，有一段时间人为地增强或减少了水流星探测。这里，我们(I)用示例性的2DVD数据集来说明该异常，(Ii)描述该异常的起源，(Iii)开发并提供一种算法来帮助标记可能被该异常部分破坏的数据，以及(Iv)探索该异常的流行度和数量影响。虽然在研究的每一次主要降雨事件和作者检查的每一张2DVD中都能看到这种异常，但这种异常人为地诱导了不到所有检测到的雨滴的3%，通常改变了对雨率和累积的估计不到2%。
The two-dimensional video distrometer (2DVD) is a well known ground based point-monitoring precipitation gauge, often used as a ground truth instrument to validate radar or satellite rainfall retrieval algorithms. This instrument records a number of variables for each detected hydrometeor, including the detected position within the sample area of the instrument. Careful analyses of real 2DVD data reveal an artifact—there are time periods where hydrometeor detections within parts of the sample area are artificially enhanced or diminished. Here, we (i) illustrate this anomaly with an exemplary 2DVD data set, (ii) describe the origin of this anomaly, (iii) develop and present an algorithm to help flag data potentially partially corrupted by this anomaly, and (iv) explore the prevalence and quantitative impact of this anomaly. Although the anomaly is seen in every major rain event studied and by every 2DVD the authors have examined, the anomaly artificially induces less than 3% of all detected drops and typically alters estimates of rain rates and accumulations by less than 2%.