气候变化领域集成服务门户(CCPortal): Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica

CCPortal

DOI	10.5194/acp-20-6379-2020
	Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica - Part 1: Long-term trends
	John French W.R.; Mulligan F.J.; Klekociuk A.R.
发表日期	2020
ISSN	1680-7316
起始页码	6379
结束页码	6394
卷号	20 期号:11
英文摘要	The long-term trend, solar cycle response, and residual variability in 24 years of hydroxyl nightglow rotational temperatures above Davis research station, Antarctica (68ĝˆ S, 78ĝˆ E) are reported. Hydroxyl rotational temperatures are a layer-weighted proxy for kinetic temperatures near 87 km altitude and have been used for many decades to monitor trends in the mesopause region in response to increasing greenhouse gas emissions. Routine observations of the OH(6-2) band P-branch emission lines using a scanning spectrometer at Davis station have been made continuously over each winter season since 1995. Significant outcomes of this most recent analysis update are the following: (a) a record-low winter-average temperature of 198.3 K is obtained for 2018 (1.7 K below previous low in 2009); (b) a long-term cooling trend of $- 1.2 \pm 0.51$ K per decade persists, coupled with a solar cycle response of 4.3±1.02 K per 100 solar flux units; and (c) we find evidence in the residual winter mean temperatures of an oscillation on a quasi-quadrennial (QQO) timescale which is investigated in detail in Part 2 of this work. Our observations and trend analyses are compared with satellite measurements from Aura/MLS version v4.2 level-2 data over the last 14 years, and we find close agreement (a best fit to temperature anomalies) with the 0.00464 hPa pressure level values. The solar cycle response (3.4±2.3 K per 100 sfu), long-term trend ( $- 1.3 \pm 1.2$ K per decade), and underlying QQO residuals in Aura/MLS are consistent with the Davis observations. Consequently, we extend the Aura/MLS trend analysis to provide a global view of solar response and long-term trend for Southern and Northern Hemisphere winter seasons at the 0.00464 hPa pressure level to compare with other observers and models. © 2020 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	air temperature; hydroxyl radical; long-term change; mesopause; nightglow; solar cycle; trend analysis; Antarctica
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/247743
作者单位	Australian Antarctic Division, 203 Channel Hwy, Kingston, TAS 7050, Australia; Maynooth University, Maynooth, Co. Kildare, Ireland; Department of Physics, University of Adelaide, Adelaide, 5005, Australia
推荐引用方式 GB/T 7714	John French W.R.,Mulligan F.J.,Klekociuk A.R.. Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica - Part 1: Long-term trends[J],2020,20(11).
APA	John French W.R.,Mulligan F.J.,&Klekociuk A.R..(2020).Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica - Part 1: Long-term trends.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(11).
MLA	John French W.R.,et al."Analysis of 24 years of mesopause region OH rotational temperature observations at Davis, Antarctica - Part 1: Long-term trends".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.11(2020).