Application of commercial microwave links (CMLs) attenuation for quantitative estimation of precipitation

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Magdalena Pasierb, Zofia Bałdysz, Jan Szturc, Grzegorz Nykiel, Anna Jurczyk, Katarzyna Ośródka, Mariusz Figurski, Marcin Wojtczak, Cezary Wojtkowski
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引用次数: 0

Abstract

Precipitation estimation models are typically sourced by rain gauges, weather radars and satellite observations. A relatively new technique of precipitation estimation relies on the network of Commercial Microwave Links (CMLs) employed for cellular communication networks: the rain-inducted attenuation in the links enables the precipitation estimation. In the paper, it is analysed to what extent the precipitation derived from CML attenuation data is useful in estimation of the precipitation field with the high temporal and spatial resolution required in nowcasting models. Two methods of determination of precipitation along CMLs from attenuation of signal with several frequencies were proposed. Then, in order to generate precipitation field, three approaches for assigning appropriate precipitation values to a specific point or set of pixels along the link are developed and tested. The CML-based estimates are compared with point observations from manual rain gauges and multi-source precipitation fields using daily and half-hourly accumulations. It was found that the CML-based precipitation fields are much worse than radar-derived estimates. At the same time, they had slightly poorer reliability than spatially interpolated telemetric rain gauge data and significantly higher reliability than satellite estimates. Furthermore, the impact of link characteristics, such as length and frequency, on the reliability of CML-based precipitation estimates is analysed.

Abstract Image

应用商用微波链路(CMLs)衰减定量估算降水量
降水估算模型通常来自雨量计、气象雷达和卫星观测。一种相对较新的降水估算技术依赖于蜂窝通信网络中使用的商业微波链路(CML)网络:链路中的雨导衰减可用于降水估算。本文分析了从 CML 衰减数据中得出的降水量在多大程度上可用于估算降水场,而降水场的时间和空间分辨率在预报模式中要求很高。本文提出了从多个频率的信号衰减中确定沿 CML 降水量的两种方法。然后,为了生成降水场,开发并测试了三种方法,用于为链路上的特定点或像素集分配适当的降水值。将基于 CML 的估计值与人工雨量计的点观测值以及使用每日和每半小时累积量的多源降水场进行了比较。结果发现,基于 CML 的降水量场比雷达估算的降水量场差很多。同时,它们的可靠性略低于空间插值遥测雨量计数据,但明显高于卫星估测数据。此外,还分析了链路特征(如长度和频率)对基于 CML 的降水量估计的可靠性的影响。
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来源期刊
Meteorological Applications
Meteorological Applications 地学-气象与大气科学
CiteScore
5.70
自引率
3.70%
发文量
62
审稿时长
>12 weeks
期刊介绍: The aim of Meteorological Applications is to serve the needs of applied meteorologists, forecasters and users of meteorological services by publishing papers on all aspects of meteorological science, including: applications of meteorological, climatological, analytical and forecasting data, and their socio-economic benefits; forecasting, warning and service delivery techniques and methods; weather hazards, their analysis and prediction; performance, verification and value of numerical models and forecasting services; practical applications of ocean and climate models; education and training.
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