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DOI	10.5194/acp-22-15925-2022
	Occurrence of polar stratospheric clouds as derived from ground-based zenith DOAS observations using the colour index
	Lauster, Bianca; Doerner, Steffen; Enell, Carl-Fredrik; Friess, Udo; Gu, Myojeong; Pukite, Janis; Raffalski, Uwe; Wagner, Thomas
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	15925
结束页码	15942
卷号	22 期号:24 页码:18
英文摘要	Polar stratospheric clouds (PSCs) are an important component of ozone chemistry in polar regions. Studying the ozone-depleting processes requires a precise description of PSCs on a long-term basis. Although satellite observations already yield high spatial coverage, continuous ground-based measurements covering long time periods can be a valuable complement. In this study, differential optical absorption spectroscopy (DOAS) instruments are used to investigate the occurrence of PSCs based on the so-called colour index (CI), i.e. the colour of the zenith sky. Defined as the ratio between the observed intensities of scattered sunlight at two wavelengths, it provides a method to detect PSCs during twilight even in the presence of tropospheric clouds. We present data from instruments at the German research station Neumayer, Antarctica (71 & LCIRC; S, 8 & LCIRC; W), as well as Kiruna, Sweden (68 & LCIRC; N, 20 & LCIRC; E), which have been in operation for more than 20 years. For a comprehensive interpretation of the measurement data, the well-established radiative transfer model McArtim is used and radiances of scattered sunlight are simulated at several wavelengths for different solar zenith angles and various atmospheric conditions. The aim is to improve and evaluate the potential of this method. It is then used to infer the seasonal cycle and the variability of PSC occurrence throughout the time series measured in both hemispheres. A good agreement is found to satellite retrievals with deviations particularly in spring. The unexpectedly high signal observed in the DOAS data during springtime suggests the influence of volcanic aerosol. This is also indicated by enhanced aerosol extinction as seen from OMPS (Ozone Mapping and Profiler Suite) data but is not captured by other PSC climatologies. The presented approach allows the detection of PSCs for various atmospheric conditions not only for individual case studies but over entire time series, which is a decisive advance compared to previous work on the PSC detection by ground-based instruments. Apart from the interannual variability, no significant trend is detected for either measurement station. The averaged PSC relative frequency amounts to about 37 % above the Neumayer station and about 18 % above Kiruna.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000900233300001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273317
作者单位	Max Planck Society; Ruprecht Karls University Heidelberg
推荐引用方式 GB/T 7714	Lauster, Bianca,Doerner, Steffen,Enell, Carl-Fredrik,et al. Occurrence of polar stratospheric clouds as derived from ground-based zenith DOAS observations using the colour index[J],2022,22(24):18.
APA	Lauster, Bianca.,Doerner, Steffen.,Enell, Carl-Fredrik.,Friess, Udo.,Gu, Myojeong.,...&Wagner, Thomas.(2022).Occurrence of polar stratospheric clouds as derived from ground-based zenith DOAS observations using the colour index.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(24),18.
MLA	Lauster, Bianca,et al."Occurrence of polar stratospheric clouds as derived from ground-based zenith DOAS observations using the colour index".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.24(2022):18.