气候变化领域集成服务门户(CCPortal): Influences of Solar Forcing at Ultraviolet and Longer Wavelengths on Climate

CCPortal

DOI	10.1029/2019JD031640
	Influences of Solar Forcing at Ultraviolet and Longer Wavelengths on Climate
	Shindell D.T.; Faluvegi G.; Schmidt G.A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:7
英文摘要	Solar forcing has contributed minimally to modern global warming, but its role in decadal and regional climate change and the mechanisms underlying those impacts remain incompletely understood. Analyses of modern observations show inconsistent surface climate responses to the solar cycle, though a clear signal is found aloft. A “top-down” mechanism connecting high altitudes to the surface has been documented, as has a “bottom-up” mechanism mediated by the ocean, but their relative importance remains unclear. To investigate these issues, we performed simulations using the GISS E2-R climate model exploring both cyclic and constant solar forcing. Simulations were driven by irradiance variations across the spectrum, and at only short (<310 nm) wavelengths, which trigger the “top-down” mechanism, and long (≥310 nm) wavelengths, which initiate the “bottom-up” mechanism. We find weak surface temperature response to cyclic solar forcing across all wavelengths despite a clear stratospheric response. In contrast, persistent solar forcing induces clear impacts in both the stratosphere and troposphere, including at the surface. For persistent forcing, tropical areas warm, which is almost entirely attributable to long wavelength forcing, whereas boreal winter extratropical responses include areas of warming and cooling with comparable magnitude impacts for short and long wavelength forcings. Both appear to excite similar annular mode responses, so that there is not a clear separation between the “top-down” and “bottom-up” mechanisms. It seems clear, however, that longwave forcing and the “bottom-up” mechanism dominate the tropical response to solar forcing, whereas both wavelengths/mechanisms can be important at middle to high latitudes, especially during the boreal winter. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	climate change; solar forcing
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186061
作者单位	Nicholas School of the Environment, Duke University, Durham, NC, United States; Porter School of the Environment and Earth Sciences, Tel Aviv University, Tel Aviv, Israel; NASA Goddard Institute for Space Studies, New York, NY, United States; Center for Climate Systems Research, Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	Shindell D.T.,Faluvegi G.,Schmidt G.A.. Influences of Solar Forcing at Ultraviolet and Longer Wavelengths on Climate[J],2020,125(7).
APA	Shindell D.T.,Faluvegi G.,&Schmidt G.A..(2020).Influences of Solar Forcing at Ultraviolet and Longer Wavelengths on Climate.Journal of Geophysical Research: Atmospheres,125(7).
MLA	Shindell D.T.,et al."Influences of Solar Forcing at Ultraviolet and Longer Wavelengths on Climate".Journal of Geophysical Research: Atmospheres 125.7(2020).