期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 44, 页码 17662-17667出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1213149110
关键词
Pinatubo; El-Chichon; Cerro Hudson; Intertropical Convergence Zone
资金
- National Science Foundation Atmospheric Chemistry Division [ATM0960594]
- South Pole Atmospheric Nitrate Isotope Analysis through SPANIA Award [OPP0125761]
- Agence Nationale de la Recherche [ANR-NT09-431976]
- Centre National de la Recherche Scientifique/Projet International de Cooperation Scientifique (PICS)
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0960594] Funding Source: National Science Foundation
The ability of sulfate aerosols to reflect solar radiation and simultaneously act as cloud condensation nuclei renders them central players in the global climate system. The oxidation of S(IV) compounds and their transport as stable S(VI) in the Earth's system are intricately linked to planetary scale processes, and precise characterization of the overall process requires a detailed understanding of the linkage between climate dynamics and the chemistry leading to the product sulfate. This paper reports a high-resolution, 22-y (1980-2002) record of the oxygen-triple isotopic composition of sulfate (SO4) aerosols retrieved from a snow pit at the South Pole. Observed variation in the O-isotopic anomaly of SO4 aerosol is linked to the ozone variation in the tropical upper troposphere/lower stratosphere via the Ozone El-Ni o Southern Oscillations (ENSO) Index (OEI). Higher Delta O-17 values (3.3%, 4.5%, and 4.2%) were observed during the three largest ENSO events of the past 2 decades. Volcanic events inject significant quantities of SO4 aerosol into the stratosphere, which are known to affect ENSO strength by modulating stratospheric ozone levels (OEI = 6 and Delta O-17 = 3.3%, OEI = 11 and Delta O-17 = 4.5%) and normal oxidative pathways. Our high-resolution data indicated that Delta O-17 of sulfate aerosols can record extreme phases of naturally occurring climate cycles, such as ENSOs, which couple variations in the ozone levels in the atmosphere and the hydrosphere via temperature driven changes in relative humidity levels. A longer term, higher resolution oxygen-triple isotope analysis of sulfate aerosols from ice cores, encompassing more ENSO periods, is required to reconstruct paleo-ENSO events and paleotropical ozone variations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据