气候变化领域集成服务门户(CCPortal): Methyl Chloroform Continues to Constrain the Hydroxyl (OH) Variability in the Troposphere

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DOI	10.1029/2020JD033862
	Methyl Chloroform Continues to Constrain the Hydroxyl (OH) Variability in the Troposphere
	Patra P.K.; Krol M.C.; Prinn R.G.; Takigawa M.; Mühle J.; Montzka S.A.; Lal S.; Yamashita Y.; Naus S.; Chandra N.; Weiss R.F.; Krummel P.B.; Fraser P.J.; O'Doherty S.; Elkins J.W.
发表日期	2021
ISSN	2169897X
卷号	126 期号:4
英文摘要	Trends and variability in tropospheric hydroxyl (OH) radicals influence budgets of many greenhouse gases, air pollutant species, and ozone depleting substances. Estimations of tropospheric OH trends and variability based on budget analysis of methyl chloroform (CH3CCl3) and process-based chemistry transport models often produce conflicting results. Here we use a previously tested transport model to simulate atmospheric CH3CCl3 for the period 1985–2018. Based on mismatches between model output and observations, we derive consistent anomalies in the inverse lifetime of CH3CCl3 (KG) using measurements from two independent observational networks (National Oceanic and Atmospheric Administration and Advanced Global Atmospheric Gases Experiment). Our method allows a separation between “physical” (transport, temperature) and “chemical” (i.e., abundance) influences on OH + CH3CCl3 reaction rate in the atmosphere. Small increases in KG due to “physical” influences are mostly driven by increases in the temperature-dependent reaction between OH and CH3CCl3 and resulted in a smoothly varying increase of 0.80% decade−1. Chemical effects on KG, linked to global changes in OH sources and sinks, show larger year-to-year variations (∼2%–3%), and have a negative correlation with the El Niño Southern Oscillation. A significant positive trend in KG can be derived after 2001, but it persists only through 2015 and only if we assume that CH3CCl3 emissions decayed more slowly over time than our best estimate suggests. If global CH3CCl3 emissions dropped below 3 Gg year−1 after 2015, recent CH3CCl3 measurements indicate that the 2015–2018 loss rate of CH3CCl3 due to reaction with OH is comparable to its value 2 decades ago. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	hydroxyl radical (OH) interannual variability; inverse lifetime of CH3CCl3; methyl chloroform (CH3CCl3)
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/185463
作者单位	Research Institute for Global Change, Japan Agency for Marine-Earth Sciences and Tech. (JAMSTEC), Yokohama, Japan; Center for Environmental Remote Sensing, Chiba University, Chiba, Japan; Meteorology and Air Quality Group, Wageningen University, Wageningen, Netherlands; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Massachusetts Institute of Technology, Cambridge, MA, United States; Scripps Institution of Oceanography, University of California, San Diego, CA, United States; NOAA Global Monitoring Laboratory, Boulder, CO, United States; Physical Research Laboratory, Ahmedabad, Gujarat, India; Now at National Institute for Environmental Studies, Tsukuba, Japan; Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, VIC, Australia; School of Chemistry, University of Bristol, Bristol, United Kingdom
推荐引用方式 GB/T 7714	Patra P.K.,Krol M.C.,Prinn R.G.,et al. Methyl Chloroform Continues to Constrain the Hydroxyl (OH) Variability in the Troposphere[J],2021,126(4).
APA	Patra P.K..,Krol M.C..,Prinn R.G..,Takigawa M..,Mühle J..,...&Elkins J.W..(2021).Methyl Chloroform Continues to Constrain the Hydroxyl (OH) Variability in the Troposphere.Journal of Geophysical Research: Atmospheres,126(4).
MLA	Patra P.K.,et al."Methyl Chloroform Continues to Constrain the Hydroxyl (OH) Variability in the Troposphere".Journal of Geophysical Research: Atmospheres 126.4(2021).