Retrieval of HCFC-142b (CH3CClF2) from ground-based high-resolution infrared solar spectra: Atmospheric increase since 1989 and comparison with surface and satellite measurements

被引：9

作者：

Mahieu, Emmanuel ^{[1
]}

Lejeune, Bernard ^{[1
]}

Bovy, Benoit ^{[1
]}

Servais, Christian ^{[1
]}

Toon, Geoffrey C. ^{[2
]}

Bernath, Peter F. ^{[3
]}

Boone, Christopher D. ^{[4
]}

Walker, Kaley A. ^{[5
]}

Reimann, Stefan ^{[6
]}

Vollmer, Martin K. ^{[6
]}

O'Doherty, Simon ^{[7
]}

机构：

[1] Univ Liege, Inst Astrophys & Geophys, Liege, Belgium

[2] CALTECH, Jet Prop Lab, Pasadena, CA USA

[3] Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA USA

[4] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[5] Univ Toronto, Dept Phys, Toronto, ON M5S 1A1, Canada

[6] Swiss Fed Labs Mat Sci & Technol, Lab Air Pollut & Environm Technol, Empa, Dubendorf, Switzerland

[7] Univ Bristol, Sch Chem, Bristol BS8 1TH, Avon, England

来源：

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER | 2017年 / 186卷

关键词：

HCFC-142b; FTIR spectroscopy; Jungfraujoch; NDACC; ACE-FTS; AGAGE; MAX-DOAS OBSERVATIONS; IN-SITU; JUNGFRAUJOCH STATION; FTIR; TREND; SPECTROSCOPY; FORMALDEHYDE; NETWORK; CO;

D O I：

10.1016/j.jqsrt.2016.03.017

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have developed an approach for retrieving HCFC-142b (CH3CCLF2) from ground-based high-resolution infrared solar spectra, using its v(7) band Q branch in the 900-906 cm(-1) interval. Interferences by HNO3, CO2 and H2O have to be accounted for. Application of this approach to observations recorded within the framework of long-term monitoring activities carried out at the northern mid-latitude, high-altitude Jungfraujoch station in Switzerland (46.5 degrees N, 8.0 degrees E, 3580 m above sea level) has provided a total column times series spanning the 1989 to mid-2015 time period. A fit to the HCFC-142b daily mean total column time series shows a statistically-significant long-term trend of (1.23 +/- 0.08 x 10(13) molec cm(-2)) per year from 2000 to 2010, at the 2-sigma confidence level. This corresponds to a significant atmospheric accumulation of (0.94 +/- 0.06) ppt (1 ppt =1/10(12)) per year for the mean tropospheric mixing ratio, at the 2-sigma confidence level. Over the subsequent time period (2010-2014), we note a significant slowing down in the HCFC-142b buildup. Our ground-based FTIR (Fourier Transform Infrared) results are compared with relevant data sets derived from surface in situ measurements at the Mace Head and Jungfraujoch sites of the AGAGE (Advanced Global Atmospheric Gases Experiment) network and from occultation measurements by the ACE-FTS (Atmospheric Chemistry Experiment-Fourier Transform Spectrometer) instrument on-board the SCISAT satellite. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：96 / 105

页数：10

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