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Near-tropopause bias in the Russian radiosonde-observed air temperature during the YOPP special observing periods in 2018
Polar Science ( IF 1.8 ) Pub Date : 2020-10-09 , DOI: 10.1016/j.polar.2020.100601
Masatake E. Hori , Jun Inoue , Klaus Dethloff , Vasilli Kustov

Taking advantage of a unique configuration of upper-atmospheric observing stations, we used enhanced radiosonde observations acquired during the Year of Polar Prediction (YOPP) at Ice Base Cape Baranova in 2018 to quantify the observational bias of a nearby station, i.e., GMO IM. E. K. Fedorova located 184 km to the southeast. Radiosonde observations from Fedorova are transmitted to the Global Telecommunications System and thus assimilated into numerical forecast products; however, those from Baranova are not, providing a situation favorable for quantifying observational bias. In comparison with the background field of the ERA5 reanalysis dataset, the Fedorova temperature profile exhibited cold bias in the lower stratosphere during the cold season in addition to a periodic warm/cold bias dipole in the upper troposphere and lower stratosphere. It is concluded that such bias is the product of both radiosonde sensor error and radar inaccuracies at Russian observational stations, given a similar result found at the Yuzhno-Sakhalinsk station.



中文翻译:

2018年YOPP特别观测期间俄罗斯无线电探空仪观测到的气温接近对流层顶偏差

利用上层大气观测站的独特配置,我们使用了2018年在巴拉诺瓦角冰原极地预报年(YOPP)期间获得的增强型探空仪观测值,以量化附近观测站(即GMO IM)的观测偏差。EK Fedorova位于东南184公里。费多罗娃的无线电探空仪观测资料被传输到全球电信系统,并因此被吸收为数值预报产品;然而,来自巴拉诺瓦的人却没有,这为量化观测偏差提供了有利的环境。与ERA5再分析数据集的背景场相比,除了在对流层上部和平流层下部存在周期性的暖/冷偏置偶极子外,在寒冷季节,Fedorova温度剖面在平流层下部还表现出冷偏置。

更新日期:2020-10-09
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