SORAS, A ground-based 110 GHz microwave radiometer for measuring the stratospheric ozone vertical profile in Seoul

IF 3.2 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Measurement Techniques Pub Date : 2024-09-03 DOI:10.5194/amt-2024-108
Soohyun Ka, Jung Jin Oh
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Abstract

Abstract. A ground-based 110 GHz radiometer was designed to measure the stratospheric ozone vertical profile by observing the 110.836 GHz ozone emission spectrum and the instrument has been operational at Sookmyung Women’s University (37.54° N, 126.97° E) in Seoul, Korea. In this paper, we detail the instrumental design, calibration procedures, correction methods, and the retrieved ozone vertical profile. The instrument is a heterodyne total power radiometer. It down-converts the observed 110.836 GHz ozone frequency to 0.609 GHz, with a frequency resolution of 61 kHz and a bandwidth of 800 MHz. The spectral intensity is digitized using a fast Fourier transform spectrometer. For hot-cold calibration, we use microwave absorbers at room temperature and liquid nitrogen as calibration targets. Tropospheric opacity is corrected using the continuous tipping curve calibration. The measured opacities were compared with simulated values from the Korea Local Analysis and Prediction System (KLAPS) data. Additionally, since 2016, the stratospheric ozone profiles over Seoul have been demonstrated for the vertical range of 100 hPa – 0.3 hPa (16 km–70 km) with validation performed by comparing them to the ozone profiles from the MLS on AURA satellite.
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SORAS,用于测量首尔平流层臭氧垂直分布的地基 110 千兆赫微波辐射计
摘要。设计了一个地基 110 GHz 辐射计,通过观测 110.836 GHz 臭氧发射光谱来测量平流层臭氧垂直剖面,该仪器已在韩国首尔淑明女子大学(北纬 37.54°,东经 126.97°)投入使用。本文将详细介绍该仪器的设计、校准程序、校正方法以及所获取的臭氧垂直剖面图。该仪器是一个外差式总功率辐射计。它将观测到的 110.836 千兆赫臭氧频率向下转换为 0.609 千兆赫,频率分辨率为 61 千赫,带宽为 800 兆赫。使用快速傅立叶变换光谱仪对光谱强度进行数字化处理。在冷热校准方面,我们使用室温下的微波吸收器和液氮作为校准目标。对流层不透光度使用连续倾角曲线校正。测量的不透明度与韩国本地分析和预测系统(KLAPS)数据的模拟值进行了比较。此外,自2016年以来,首尔上空的平流层臭氧剖面已在100 hPa - 0.3 hPa(16千米-70千米)的垂直范围内进行了演示,并通过与AURA卫星上的MLS的臭氧剖面进行比较进行了验证。
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来源期刊
Atmospheric Measurement Techniques
Atmospheric Measurement Techniques METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
7.10
自引率
18.40%
发文量
331
审稿时长
3 months
期刊介绍: Atmospheric Measurement Techniques (AMT) is an international scientific journal dedicated to the publication and discussion of advances in remote sensing, in-situ and laboratory measurement techniques for the constituents and properties of the Earth’s atmosphere. The main subject areas comprise the development, intercomparison and validation of measurement instruments and techniques of data processing and information retrieval for gases, aerosols, and clouds. The manuscript types considered for peer-reviewed publication are research articles, review articles, and commentaries.
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