干旱区生态环境知识资源中心(Arid): Impact of volcanic aerosol hemispheric symmetry on Sahel rainfall

Arid

DOI	10.1007/s00382-020-05347-7
	Impact of volcanic aerosol hemispheric symmetry on Sahel rainfall
	Jacobson, Tess W. P.; Yang, Wenchang; Vecchi, Gabriel A.; Horowitz, Larry W.
通讯作者	Jacobson, TWP
来源期刊	CLIMATE DYNAMICS
ISSN	0930-7575
EISSN	1432-0894
出版年	2020
卷号	55 期号:7-11 页码:1733-1758
英文摘要	The semi-arid African Sahel region is highly sensitive to changes in monsoon precipitation, as much of the region's workforce is employed in the agricultural industry (Hamro-Drotz and Programme 2011). Thus, studying the response of rainfall and aridity in this region to radiative perturbations is a matter of pressing humanitarian relevance. In addition, there is evidence to suggest that spatially asymmetric volcanic aerosols produce different hydroclimatic responses based on their hemispheric symmetry, both globally and in the Sahel. We use two different climate models, GFDL's FLOR model (Vecchi et al. in J Clim 27(21):7994-8016, 2014) and NCAR's CESM 1.1 model (Otto-Bliesner et al. in Bull Am Meteorol Soc 97(5):735-754, 2016), to characterize the response of rainfall in the Sahel to large volcanic eruptions based on the meridional symmetry of the volcanic eruptions. We find that in both the FLOR experiments simulating three large twentieth century eruptions and in the CESM Last Millennium Ensemble simulations of 46 historic volcanic eruptions, asymmetric Northern Hemisphere cooling causes a subsequent drying response in the Sahel, and Southern Hemisphere cooling causes a wetting, or "greening" response. Symmetric volcanic eruptions have a relatively small effect on rainfall in the Sahel. We also find that the FLOR results show a consistent response in the annual rainfall cycle in the Sahel for all three of the eruptions analyzed, with a reduction in rainfall in early summer followed by an increased rainfall in late summer. The annual cycle response of rainfall in the Sahel from the CESM experiments is different, in that the SH eruptions cause a rainfall maximum in August, NH eruptions cause a rainfall minimum in September, and symmetric eruptions show a slight increase in August and a decrease in October. Our results highlight the need for accurate meridional structures in historic volcanic forcing data used for climate models as well as the need for further study on regional effects of hemispherically asymmetric radiative forcing, especially as they might pertain to aerosol geoengineering.
英文关键词	Volcanic eruptions Precipitation ITCZ Stratospheric Aerosols Sahel
类型	Article
语种	英语
开放获取类型	Other Gold
收录类别	SCI-E
WOS记录号	WOS:000545898900001
WOS关键词	EL-CHICHON ; TEMPERATURE ANOMALIES ; EASTERLY WAVES ; PART I ; CLIMATE ; RESOLUTION ; ATLANTIC ; PRECIPITATION ; ERUPTIONS ; SIMULATIONS
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/324939
作者单位	[Jacobson, Tess W. P.] Princeton Univ, Princeton Environm Inst, Princeton, NJ 08544 USA; [Yang, Wenchang] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA; [Vecchi, Gabriel A.] Princeton Univ, Princeton Environm Inst, Dept Geosci, Atmospher & Ocean Sci Program, Princeton, NJ 08544 USA; [Horowitz, Larry W.] NOAA, Geophys Fluid Dynam Lab, Princeton, NJ USA
推荐引用方式 GB/T 7714	Jacobson, Tess W. P.,Yang, Wenchang,Vecchi, Gabriel A.,et al. Impact of volcanic aerosol hemispheric symmetry on Sahel rainfall[J],2020,55(7-11):1733-1758.
APA	Jacobson, Tess W. P.,Yang, Wenchang,Vecchi, Gabriel A.,&Horowitz, Larry W..(2020).Impact of volcanic aerosol hemispheric symmetry on Sahel rainfall.CLIMATE DYNAMICS,55(7-11),1733-1758.
MLA	Jacobson, Tess W. P.,et al."Impact of volcanic aerosol hemispheric symmetry on Sahel rainfall".CLIMATE DYNAMICS 55.7-11(2020):1733-1758.