Oxygen isotope anomaly observed in water vapor from Alert, Canada and the implication for the stratosphere

Lin Y.; Clayton R.N.; Huang L.Nakamura N.Lyons J.R.

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Oxygen isotope anomaly observed in water vapor from Alert, Canada and the implication for the stratosphere

机译：Oxygen isotope anomaly observed in water vapor from Alert, Canada and the implication for the stratosphere

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To identify the possible anomalous oxygen isotope signature in stratospheric water predicted by model studies, 25 water vapor samples were collected in 2003-2005 at Alert station, Canada (82° 30'N), where there is downward transport of stratospheric air to the polar troposphere, and were analyzed for Δ17O and Δ18O relative to Chicago local precipitation (CLP). The latter was chosen as a reference because the relatively large evaporative moisture source should erase any possible oxygen isotope anomaly from the stratosphere. A mass-dependent fractionation coefficient for meteoric waters, λMDF(H2O) = 0.529 ± 0.003 2σ standard error (SE), was determined from27 CLP samples collected in 2003-2005. An oxygen isotopic anomaly of Δ17O = 76 ± 16 ppm (2σ SE) was found in water vapor samples from Alert relative to CLP. We propose that the positive oxygen isotope anomalies observed at Alert originated from stratospheric ozone, were transferred to water in the stratosphere, and subsequently mixed with tropospheric water at high latitudes as the stratospheric air descended into the troposphere. On the basis of this ground signal, the average Δ17O in stratospheric water vapor predicted by a steady-state box model is ～40. Seven ice core samples (1930-1991) from Dasuopu glacier (Himalayas, China) and Standard Light Antarctic Precipitation did not show an obvious oxygen isotope anomaly, and Vienna Standard Mean Ocean Water exhibited a negative Δ17O relative to CLP. Six Alert snow samples collected in March 2011 and measured at Laboratoire des Sciences du Climat et de l'Environnement, Gif sur Yvette, France, had 17_(Oexcess) of 45 ± 5 ppm (2σ SE) relative to Vienna Standard Mean Ocean Water.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第39期|15608-15613|共6页
作者
Lin Y.; Clayton R.N.; Huang L.Nakamura N.Lyons J.R.;
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作者单位

Department of Geochemistry and Environment Science, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;

Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, United States;

Climate Research Division, Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, Toronto, ON, M3H 5T4, CanadaSchool of Earth and Space Exploration, Arizona State University, Tempe AZ 85287, United States;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Non-mass-dependent (NMD) fractionation; Stratosphere-troposphere transport (STT);

Oxygen isotope anomaly observed in water vapor from Alert, Canada and the implication for the stratosphere

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