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DOI	10.5194/acp-19-13227-2019
	Trends in surface radiation and cloud radiative effect at four Swiss sites for the 1996-2015 period
	Nyeki S.; Wacker S.; Aebi C.; Gröbner J.; Martucci G.; Vuilleumier L.
发表日期	2019
ISSN	16807316
起始页码	13227
结束页码	13241
卷号	19 期号:20
英文摘要	The trends of meteorological parameters and surface downward shortwave radiation (DSR) and downward longwave radiation (DLR) were analysed at four stations (between 370 and 3580ma.s.l.) in Switzerland for the 1996-2015 period. Ground temperature, specific humidity, and atmospheric integrated water vapour (IWV) trends were positive during all-sky and cloud-free conditions. Allsky DSR and DLR trends were in the ranges of 0.6-4.3 Wm-2 decade-1 and 0.9-4.3 Wm-2 decade-1, respectively, while corresponding cloud-free trends were -2:9- 3.3 Wm-2 decade-1 and 2.9-5.4 Wm-2 decade-1. Most trends were significant at the 90% and 95% confidence levels. The cloud radiative effect (CRE) was determined using radiative-transfer calculations for cloud-free DSR and an empirical scheme for cloud-free DLR. The CRE decreased in magnitude by 0.9-3.1 Wm-2 decade-1 (only one trend significant at 90% confidence level), which implies a change in macrophysical and/or microphysical cloud properties. Between 10% and 70% of the increase in DLR is explained by factors other than ground temperature and IWV. A more detailed, long-term quantification of cloud changes is crucial and will be possible in the future, as cloud cameras have been measuring reliably at two of the four stations since 2013. © Author(s) 2019.
语种	英语
scopus关键词	cloud microphysics; cloud radiative forcing; quantitative analysis; radiative transfer; trend analysis; water vapor; Switzerland
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/144071
作者单位	Physikalisch-Meteorologisches Observatorium, World Radiation Center, Davos, Switzerland; Deutscher Wetterdienst, Meteorologisches Observatorium Lindenberg, Richard-Aßmann-Observatorium, Lindenberg, Germany; Oeschger Centre for Climate Change Research, Institute of Applied Physics, University of Bern, Bern, Switzerland; Federal Office of Meteorology and Climatology MeteoSwiss, Payerne, Switzerland; Royal Meteorological Institute of Belgium, Brussels, Belgium
推荐引用方式 GB/T 7714	Nyeki S.,Wacker S.,Aebi C.,et al. Trends in surface radiation and cloud radiative effect at four Swiss sites for the 1996-2015 period[J],2019,19(20).
APA	Nyeki S.,Wacker S.,Aebi C.,Gröbner J.,Martucci G.,&Vuilleumier L..(2019).Trends in surface radiation and cloud radiative effect at four Swiss sites for the 1996-2015 period.Atmospheric Chemistry and Physics,19(20).
MLA	Nyeki S.,et al."Trends in surface radiation and cloud radiative effect at four Swiss sites for the 1996-2015 period".Atmospheric Chemistry and Physics 19.20(2019).