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DOI | 10.1073/pnas.1807532115 |
Modulation of hydroxyl variability by ENSO in the absence of external forcing | |
Turner, Alexander J.1,2; Fung, Inez1; Naik, Vaishali3; Horowitz, Larry W.3; Cohen, Ronald C.1,2 | |
2018-09-04 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:36页码:8931-8936 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The hydroxyl radical (OH) is the primary oxidant in the troposphere, and the impact of its fluctuations on the methane budget has been disputed in recent years, however measurements of OH are insufficient to characterize global interannual fluctuations relevant for methane. Here, we use a 6,000-y control simulation of preindustrial conditions with a chemistry-climate model to quantify the natural variability in OH and internal feedbacks governing that variability. We find that, even in the absence of external forcing, maximum OH changes are 3.8 +/- 0.8% over a decade, which is large in the context of the recent methane growth from 2007-2017. We show that the OH variability is not a white-noise process. A wavelet analysis indicates that OH variability exhibits significant feedbacks with the same periodicity as the El Nino-Southern Oscillation (ENSO). We find intrinsically generated modulation of the OH variability, suggesting that OH may show periods of rapid or no change in future decades that are solely due to the internal climate dynamics (as opposed to external forcings). An empirical orthogonal function analysis further indicates that ENSO is the dominant mode of OH variability, with the modulation of OH occurring primarily through lightning NOx. La Nina is associated with an increase in convection in the Tropical Pacific, which increases the simulated occurrence of lightning and allows for more OH production. Understanding this link between OH and ENSO may improve the predictability of the oxidative capacity of the troposphere and assist in elucidating the causes of current and historical trends in methane. |
英文关键词 | hydroxyl ENSO La Nina methane tropospheric oxidative capacity |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443555000049 |
WOS关键词 | NINO-SOUTHERN-OSCILLATION ; ATMOSPHERIC HYDROXYL ; CLIMATE-CHANGE ; CLEANSING CAPACITY ; TROPOSPHERIC OZONE ; FOSSIL-FUEL ; METHANE ; SIMULATIONS ; EMISSIONS ; RADICALS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204982 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA; 2.Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA; 3.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ 08540 USA |
推荐引用方式 GB/T 7714 | Turner, Alexander J.,Fung, Inez,Naik, Vaishali,et al. Modulation of hydroxyl variability by ENSO in the absence of external forcing[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(36):8931-8936. |
APA | Turner, Alexander J.,Fung, Inez,Naik, Vaishali,Horowitz, Larry W.,&Cohen, Ronald C..(2018).Modulation of hydroxyl variability by ENSO in the absence of external forcing.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(36),8931-8936. |
MLA | Turner, Alexander J.,et al."Modulation of hydroxyl variability by ENSO in the absence of external forcing".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.36(2018):8931-8936. |
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