气候变化领域集成服务门户(CCPortal): Stratospheric Ozone in the Last Glacial Maximum

CCPortal

DOI	10.1029/2020JD032929
	Stratospheric Ozone in the Last Glacial Maximum
	Wang M.; Fu Q.; Solomon S.; White R.H.; Alexander B.
发表日期	2020
ISSN	2169897X
卷号	125 期号:21
英文摘要	Using the Whole Atmosphere Community Climate Model version 6, stratospheric ozone in the Last Glacial Maximum (LGM) is investigated. It is shown that, compared with preindustrial (PI) times, LGM modeled stratospheric temperatures are increased by up to 8 K, leading to faster ozone destruction rates for gas phase reactions, especially via the Chapman mechanism. On the other hand, stratospheric hydroxyl radical (OH) and nitrogen oxides (NOx) concentrations are decreased by 10–20%, which decreases catalytic ozone destruction, thereby decreasing ozone loss rates. The net effect of these two compensating mechanisms in the upper stratosphere (above 15 hPa) is a vertically integrated 1–3 Dobson unit (DU) decrease during the LGM. In the lower stratosphere (tropopause to 15 hPa), changes in the stratospheric overturning circulation and resulting transport dominate changes in ozone. Consistent with a weakening of the residual circulation in the LGM, lower stratospheric ozone is increased by 2–5 DU in the tropics and decreased by 5–10 DU in the extratropics, but the latter is partly compensated by ozone increases due to a lower tropopause. It is found that tropospheric ozone is decreased by about 5 DU in the LGM versus PI. Combined changes in stratospheric and tropospheric ozone lead to a decrease in total ozone column everywhere except over the northeast North America, equatorial Indian and West Pacific Oceans. Surface ultraviolet radiation in the LGM versus PI is increased over the Northern Hemisphere middle and high latitudes, especially over the ice caps, and over the Southern Hemisphere near 60°S. ©2020. The Authors.
英文关键词	Last Glacial Maximum; stratospheric ozone; ultraviolet radiation; WACCM6
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/185681
作者单位	Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Boston, MA, United States; Barcelona Supercomputing Center, Barcelona, Spain
推荐引用方式 GB/T 7714	Wang M.,Fu Q.,Solomon S.,et al. Stratospheric Ozone in the Last Glacial Maximum[J],2020,125(21).
APA	Wang M.,Fu Q.,Solomon S.,White R.H.,&Alexander B..(2020).Stratospheric Ozone in the Last Glacial Maximum.Journal of Geophysical Research: Atmospheres,125(21).
MLA	Wang M.,et al."Stratospheric Ozone in the Last Glacial Maximum".Journal of Geophysical Research: Atmospheres 125.21(2020).