G. Krysztofiak, Y. Té, V. Catoire, G. Berthet, G. Toon, F. Jégou, P. Jeseck, C. Robert
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Total column measurements above Paris and from SWIR balloon-borne instrument are compared with several MkIV measurements, several Network for the Detection of Atmospheric Composition Change (NDACC) stations, aircraft, ship, and balloon measurements to highlight the OCS total column decrease from tropical to polar latitudes. OCS high-resolution in situ vertical profiles have been measured for the first time in the altitude range between 14 and 30 km at tropical and polar latitudes. OCS profiles are compared with Atmospheric Chemistry Experiment (ACE) satellite measurements and show good agreement. Using the correlation between OCS and N2O from SPIRALE, the OCS stratospheric lifetime has been accurately determined. 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引用次数: 27
摘要
羰基硫化物(OCS)是硫酸盐气溶胶的重要前体,因此是平流层臭氧消耗的关键物质。红外吸收激光器(SPIRALE)和短波红外(SWIR)气球载仪器已在热带和极地北极飞行,地面测量由巴黎的qualit de l'Air (QualAir)傅立叶变换光谱仪进行。研究了OCS随海拔、纬度和季节的变化规律。巴黎年总柱变化呈季节性变化,4 - 6月最大,11 - 1月最小。将巴黎上空和SWIR气球载仪器的总柱测量值与若干MkIV测量值、若干大气成分变化探测网络(NDACC)站、飞机、船舶和气球测量值进行比较,以突出OCS总柱从热带到极地纬度的减少。OCS高分辨率原位垂直剖面首次在热带和极地纬度14至30公里的高度范围内进行了测量。将OCS剖面与大气化学实验(ACE)卫星测量结果进行了比较,结果吻合较好。利用SPIRALE的OCS与N2O的相关性,可以准确地确定OCS的平流层寿命。我们发现,平流层寿命在极纬为68±20年,在热带纬为58±14年,导致全球平流层汇为49±14 Gg S y−1。
Carbonyl Sulphide (OCS) Variability with Latitude in the Atmosphere
Abstract Carbonyl sulphide (OCS) is an important precursor of sulphate aerosols and consequently a key species in stratospheric ozone depletion. The SPectromètre InfraRouge d'Absorption à Lasers Embarqués (SPIRALE) and shortwave infrared (SWIR) balloon-borne instruments have flown in the tropics and in the polar Arctic, and ground-based measurements have been performed by the Qualité de l'Air (QualAir) Fourier Transform Spectrometer in Paris. Partial and total columns and vertical profiles have been obtained to study OCS variability with altitude, latitude, and season. The annual total column variation in Paris reveals a seasonal variation with a maximum in April–June and a minimum in November–January. Total column measurements above Paris and from SWIR balloon-borne instrument are compared with several MkIV measurements, several Network for the Detection of Atmospheric Composition Change (NDACC) stations, aircraft, ship, and balloon measurements to highlight the OCS total column decrease from tropical to polar latitudes. OCS high-resolution in situ vertical profiles have been measured for the first time in the altitude range between 14 and 30 km at tropical and polar latitudes. OCS profiles are compared with Atmospheric Chemistry Experiment (ACE) satellite measurements and show good agreement. Using the correlation between OCS and N2O from SPIRALE, the OCS stratospheric lifetime has been accurately determined. We find a stratospheric lifetime of 68 ± 20 years at polar latitudes and 58 ± 14 years at tropical latitudes leading to a global stratospheric sink of 49 ± 14 Gg S y−1.
期刊介绍:
Atmosphere-Ocean is the principal scientific journal of the Canadian Meteorological and Oceanographic Society (CMOS). It contains results of original research, survey articles, notes and comments on published papers in all fields of the atmospheric, oceanographic and hydrological sciences. Arctic, coastal and mid- to high-latitude regions are areas of particular interest. Applied or fundamental research contributions in English or French on the following topics are welcomed:
climate and climatology;
observation technology, remote sensing;
forecasting, modelling, numerical methods;
physics, dynamics, chemistry, biogeochemistry;
boundary layers, pollution, aerosols;
circulation, cloud physics, hydrology, air-sea interactions;
waves, ice, energy exchange and related environmental topics.