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首页> 外文期刊>Quarterly Journal of the Royal Meteorological Society >Comparison of real-time refractivity measurements by radar with automatic weather stations, AROME-WMED and WRF forecast simulations during SOP1 of the HyMeX campaign
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Comparison of real-time refractivity measurements by radar with automatic weather stations, AROME-WMED and WRF forecast simulations during SOP1 of the HyMeX campaign

机译：HyMeX活动的SOP1期间雷达与自动气象站的实时折射率测量，AROME-WMED和WRF预测模拟的比较

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Weather radars, originally designed to detect and quantify precipitation, can be used to estimate and map the refractivity at low levels, a proxy for humidity. As highlighted by previous studies, this presents a definite meteorological interest, both for numerical weather prediction and for atmospheric process studies. Recent works have given keys to performing high-accuracy measurements with operational radar without decreasing the quality of reflectivity and Doppler wind classical measurements, and the retrieval of radar refractivity is now performed in real time with the Meteo-France Application Radar a la Meteorologie Infra-Synoptique (ARAMIS) operational network. Taking advantage of the Hydrological cycle in Mediterranean eXperiment (HyMeX) field campaign (September-November 2012), refractivity measured by a few radars located in southeast France has been compared with in situ measurement by Automatic Weather Stations (AWSs), and correlation between these two independent observations is quite good, in particular giving high quality for the diurnal cycle and during the pre-convection period measurement by the radar. To go further in the evaluation of the usefulness of such a product, we compared refractivity derived from radar measurements and from two different kinds of model: the numerical prediction model Applications de la Recherche a l'Operationnel a Meso-Echelle - Western MEDiterranean (AROME-WMED) using a 2.5 km resolution grid mesh over southern France and a coarser resolution simulation (54 x 54 km) performed with the Weather Research and Forecasting (WRF) model, which both ran in a forecasting mode during the HyMeX Special Observing Period 1. These two models give access to the variability of the modelling and thus enable us to quantify the uncertainty of the refractivity modelling. The result of this comparison is generally fairly good, with a pattern of refractivity field similar to observations (AWS and radar), although obviously with locally strong differences. We finally illustrate the usefulness of refractivity mapping by radar by investigating a typical meteorological situation of a convective system observed during the HyMeX campaign.
机译：最初设计用于检测和量化降水的天气雷达可用于估计和绘制低水平的折射率，这是湿度的代名词。正如以前的研究所强调的那样，这对数值天气预报和大气过程研究都具有一定的气象学意义。最近的工作为在不降低反射率和多普勒风经典测量质量的情况下使用操作雷达进行高精度测量提供了关键，现在，通过“法国气象卫星应用雷达”实时检索雷达折射率。 Synoptique（ARAMIS）操作网络。利用地中海实验（HyMeX）的水文循环（HyMeX）野外活动（2012年9月至11月），将法国东南部一些雷达测得的折射率与自动气象站（AWS）进行的原位测量进行了比较，并将两者之间的相关性进行了比较。两项独立的观测结果非常好，特别是在昼夜周期和对流前的雷达测量过程中提供了高质量的观测结果。为了进一步评估此类产品的实用性，我们比较了从雷达测量和两种不同模型得出的折射率：数值预测模型应用中型Echelle的操作模型-中西西部（AROME -WMED），使用法国南部上空的2.5 km分辨率网格进行网格划分，并使用Weather Research and Forecasting（WRF）模型进行较粗略的分辨率模拟（54 x 54 km），这两个模型均在HyMeX特殊观测期1中以预测模式运行这两个模型提供了建模的可变性，从而使我们能够量化折射率建模的不确定性。这种比较的结果通常是相当好的，其折射场的模式类似于观测值（AWS和雷达），尽管显然存在局部强烈差异。最后，我们通过研究HyMeX运动期间观察到的对流系统的典型气象情况，说明了雷达进行折射率映射的有用性。

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