globalchange  > 气候减缓与适应
DOI: 10.1038/NGEO2236
Vertical structure of stratospheric water vapour trends derived from merged satellite data
Author: Hegglin M.I.; Plummer D.A.; Shepherd T.G.; Scinocca J.F.; Anderson J.; Froidevaux L.; Funke B.; Hurst D.; Rozanov A.; Urban J.; Von Clarmann T.; Walker K.A.; Wang H.J.; Tegtmeier S.; Weigel K.
Source Publication: Nature Geoscience
ISSN: 17520894
Publishing Year: 2014
Volume: 7, Issue:10
pages begin: 768
pages end: 776
Language: 英语
Scopus Keyword: balloon observation ; climate modeling ; concentration (composition) ; data set ; greenhouse gas ; meteorology ; methane ; radiative forcing ; satellite data ; stratosphere ; transfer function ; tropopause ; water vapor ; Boulder ; Colorado ; United States
English Abstract: Stratospheric water vapour is a powerful greenhouse gas. The longest available record from balloon observations over Boulder, Colorado, USA shows increases in stratospheric water vapour concentrations that cannot be fully explained by observed changes in the main drivers, tropical tropopause temperatures and methane. Satellite observations could help resolve the issue, but constructing a reliable long-term data record from individual short satellite records is challenging. Here we present an approach to merge satellite data sets with the help of a chemistry-climate model nudged to observed meteorology. We use the models' water vapour as a transfer function between data sets that overcomes issues arising from instrument drift and short overlap periods. In the lower stratosphere, our water vapour record extends back to 1988 and water vapour concentrations largely follow tropical tropopause temperatures. Lower and mid-stratospheric long-term trends are negative, and the trends from Boulder are shown not to be globally representative. In the upper stratosphere, our record extends back to 1986 and shows positive long-term trends. The altitudinal differences in the trends are explained by methane oxidation together with a strengthened lower-stratospheric and a weakened upper-stratospheric circulation inferred by this analysis. Our results call into question previous estimates of surface radiative forcing based on presumed global long-term increases in water vapour concentrations in the lower stratosphere. © 2014 Macmillan Publishers Limited. All rights reserved.
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Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: University of Reading, Department of Meteorology, Reading, United Kingdom; Canadian Centre for Climate Modelling and Analysis, Victoria, BC, Canada; Hampton University, Atmospheric and Planetary Science, Hampton, VA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Instituto de Astrofisica de Andalucia, Granada, Spain; NOAA Earth System Research Laboratory, Global Monitoring Divison, Boulder, CO, United States; University of Bremen, Institute of Environmental Physics, Bremen, Germany; Chalmers University of Technology, Department of Earth and Space Sciences, Gothenburg, Sweden; Karlsruhe Institute of Technology, Karlsruhe, Germany; University of Toronto, Toronto, Canada; Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA, United States; GEOMAR, Kiel, Germany

Recommended Citation:
Hegglin M.I.,Plummer D.A.,Shepherd T.G.,et al. Vertical structure of stratospheric water vapour trends derived from merged satellite data[J]. Nature Geoscience,2014-01-01,7(10)
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