气候变化领域集成服务门户(CCPortal): Summer variability of the atmospheric NO2 : NO ratio a Dome C on the East Antarctic Plateau

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DOI	10.5194/acp-22-12025-2022
	Summer variability of the atmospheric NO2 : NO ratio a Dome C on the East Antarctic Plateau
	Barbero, Albane; Grilli, Roberto; Frey, Markus M.; Blouzon, Camille; Helmig, Detlev; Caillon, Nicolas; Savarino, Joel
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12025
结束页码	12054
卷号	22 期号:18 页码:30
英文摘要	Previous Antarctic summer campaigns have shown unexpectedly high levels of oxidants in the lower atmosphere of the continental plateau and at coastal regions, with atmospheric hydroxyl radical (OH) concentrations up to 4 x 10(6) cm(-3). Such high reactivity in the summer Antarctic boundary layer results in part from the emissions of nitrogen oxides (NOx NO + NO2) produced during photo-denitrification of the snowpack, but its underlying mechanisms are not yet fully understood, as some of the chemical species involved (NO2, in particular) have not yet been measured directly and accurately. To overcome this crucial lack of information, newly developed optical instruments based on absorption spectroscopy (incoherent broadband cavity-enhanced absorption spectroscopy, IBBCEAS) were deployed for the first time at Dome C (-75.10 lat., 123.33 long., 3233 m a.s.l.) during the 2019-2020 summer campaign to investigate snow-air-radiation interaction. These instruments directly measure NO2 with a detection limit of 30 pptv (parts per trillion by volume or 10(-12) mol mol(-1)) (3 sigma). We performed two sets of measurements in December 2019 (4 to 9) and January 2020 (16 to 25) to capture the early and late photolytic season, respectively. Late in the season, the daily averaged NO2 : NO ratio of 0.4 +/- 0.4 matches that expected for photochemical equilibrium through Leighton's extended relationship involving ROx (0.6 +/- 0.3). In December, however, we observed a daily averaged NO2 : NO ratio of 1.3 +/- 1.1, which is approximately twice the daily ratio of 0.7 +/- 0.4 calculated for the Leighton equilibrium. This suggests that more NO2 is produced from the snowpack early in the photolytic season (4 to 9 December), possibly due to stronger UV irradiance caused by a smaller solar zenith angle near the solstice. Such a high sensitivity of the NO2 : NO ratio to the sun's position is of importance for consideration in atmospheric chemistry models.
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:000854218200001
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/273225
作者单位	Centre National de la Recherche Scientifique (CNRS); Communaute Universite Grenoble Alpes; UDICE-French Research Universities; Universite Grenoble Alpes (UGA); Institut de Recherche pour le Developpement (IRD); UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC British Antarctic Survey
推荐引用方式 GB/T 7714	Barbero, Albane,Grilli, Roberto,Frey, Markus M.,et al. Summer variability of the atmospheric NO2 : NO ratio a Dome C on the East Antarctic Plateau[J],2022,22(18):30.
APA	Barbero, Albane.,Grilli, Roberto.,Frey, Markus M..,Blouzon, Camille.,Helmig, Detlev.,...&Savarino, Joel.(2022).Summer variability of the atmospheric NO2 : NO ratio a Dome C on the East Antarctic Plateau.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),30.
MLA	Barbero, Albane,et al."Summer variability of the atmospheric NO2 : NO ratio a Dome C on the East Antarctic Plateau".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):30.