DOI: 10.1038/ngeo2066
论文题名: Tropospheric ozone trends at Mauna Loa Observatory tied to decadal climate variability
作者: Lin M. ; Horowitz L.W. ; Oltmans S.J. ; Fiore A.M. ; Fan S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 2 起始页码: 136
结束页码: 143
语种: 英语
Scopus关键词: atmospheric circulation
; atmospheric transport
; climate variation
; decadal variation
; greenhouse gas
; hydroxyl radical
; ozone
; trace gas
; trend analysis
; troposphere
; Hawaii [(ISL) Hawaiian Islands]
; Hawaii [United States]
; Hawaiian Islands
; Mauna Loa Observatory
; United States
英文摘要: A potent greenhouse gas and biological irritant, tropospheric ozone is also the primary source of atmospheric hydroxyl radicals, which remove numerous hazardous trace gases from the atmosphere. Tropospheric ozone levels have increased in spring at remote sites in the mid-latitudes of the Northern Hemisphere over the past few decades; this increase has been attributed to a growth in Asian precursor emissions. In contrast, 40 years of continuous measurements at Mauna Loa Observatory in Hawaii reveal little change in tropospheric ozone levels during spring (March-April), but a rise in autumn (September-October). Here we examine the contribution of decadal shifts in atmospheric circulation patterns to decadal variability in tropospheric ozone levels at Mauna Loa using a suite of chemistry-climate model simulations. We show that the flow of ozone-rich air from Eurasia towards Hawaii during spring weakened in the 2000s as a result of La-Niña-like decadal cooling in the eastern equatorial Pacific Ocean. During autumn, in contrast, the flow of ozone-rich air from Eurasia to Hawaii strengthened in the mid-1990s onwards, coincident with the positive phase of the Pacific-North American pattern. We suggest that these shifts in atmospheric circulation patterns can reconcile observed trends in tropospheric ozone levels at Mauna Loa and the northern mid-latitudes in recent decades. We conclude that decadal variability in atmospheric circulation patterns needs to be considered when attributing observed changes in tropospheric ozone levels to human-induced trends in precursor emissions. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106452
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ 08540, United States; NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; NOAA Earth System Research Laboratory, Boulder, CO 80305, United States; Department of Earth and Environmental Sciences and Lamont-Doherty Earth-Observatory, Columbia University, Palisades, NY 10964, United States
Recommended Citation:
Lin M.,Horowitz L.W.,Oltmans S.J.,et al. Tropospheric ozone trends at Mauna Loa Observatory tied to decadal climate variability[J]. Nature Geoscience,2014-01-01,7(2)