DOI: 10.1002/2013JD020577
论文题名: Using FTIR measurements of stratospheric composition to identify midlatitude polar vortex intrusions over Toronto
作者: Whaley C. ; Strong K. ; Adams C. ; Bourassa A.E. ; Daffer W.H. ; Degenstein D.A. ; Fast H. ; Fogal P.F. ; Manney G.L. ; Mittermeier R.L. ; Pavlovic B. ; Wiacek A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 22 起始页码: 12766
结束页码: 12783
语种: 英语
英文关键词: filaments
; FTIR
; intrusions
; ozone
; polar vortex
; Toronto
Scopus关键词: Filaments (lamp)
; Gases
; Infrared imaging
; Nitrogen oxides
; Ozone
; Ozone layer
; Vorticity
; Earth probe total ozone mapping spectrometers
; Fourier transform infrared
; FTIR
; intrusions
; Ozone monitoring instruments
; Polar vortex
; Spectroscopic measurements
; Toronto
; Vortex flow
; atmospheric chemistry
; chemical composition
; FTIR spectroscopy
; observatory
; ozone
; polar vortex
; satellite imagery
; stratosphere
; trace gas
; vorticity
; Canada
; Ontario [Canada]
; Toronto
英文摘要: Using 11 years of trace gas measurements made at the University of Toronto Atmospheric Observatory (43.66°N, 79.40°W) and Environment Canada's Centre for Atmospheric Research Experiments (44.23°N, 79.78°W), along with derived meteorological products, we identify a number of polar intrusion events, which are excursions of the polar vortex or filaments from the polar vortex extending down to midlatitudes. These events are characterized by enhanced stratospheric columns (12-50 km) of hydrogen fluoride (HF), by diminished stratospheric columns of nitrous oxide (N2 O), and by a scaled potential vorticity above 1.2 × 10-4s-1. The events comprise 16%of winter/spring (November to April inclusive) Fourier transform infrared (FTIR) spectroscopic measurements from January 2002 to March 2013, and we find at least two events per year. The events are corroborated by Modèle Isentrope du transport Méso-échelle de l'Ozone Stratosphérique par Advection, Modern-Era Retrospective Analysis for Research and Applications potential vorticity maps, and Global Modeling Initiative N2 O maps. During polar intrusion events, the stratospheric ozone (O3 ) columns over Toronto are usually greater than when there is no event. Our O3 measurements agree with the Optical Spectrograph and Infrared Imaging System satellite instrument and are further verified with the Earth Probe Total Ozone Mapping Spectrometer and Ozone Monitoring Instrument satellite observations. We find six cases out of 53 for which chemical O 3 depletion within the polar vortex led to a reduction in stratospheric O3 columns over Toronto. We have thus identified a dynamical cause for most of the winter/spring variability of stratospheric trace gas columns observed at our midlatitude site. While there have been a number of prior polar intrusion studies, this is the first study to report in the context of 11 years of ground-based FTIR column measurements, providing insight into the frequency of midlatitude polar vortex intrusions and observations of upper stratospheric (25-50 km) intrusions. It is also the first to present HF measurements during multiple polar intrusions, which provided an excellent tracer for their identification. Key Points Polar vortex intrusions to mid-latitude detected in Toronto FTIR measurements Mid-latitude polar intrusions confirmed with MIMOSA, MERRA, GMI, OSIRIS, DMPs Dynamical cause for variability in 11 years of FTIR HCl, HF and N2O data ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63136
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 1A7, Canada; Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, Canada; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Air Quality Research Division, Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, Toronto, ON, Canada; NorthWest Research Associates, Socorro, NM, United States; Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM, United States; Department of Physics, University of Guelph, Guelph, ON, Canada; Environmental Science, Saint Mary's University, Halifax, NS, Canada
Recommended Citation:
Whaley C.,Strong K.,Adams C.,et al. Using FTIR measurements of stratospheric composition to identify midlatitude polar vortex intrusions over Toronto[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(22)