Comparison of N2O5 mixing ratios during NO3Comp 2007 in SAPHIR

被引：20

作者：

Fuchs, H. ^{[1
,2
,5
]}

Simpson, W. R. ^{[3
,4
]}

Apodaca, R. L. ^{[3
,4
]}

Brauers, T. ^{[1
]}

Cohen, R. C. ^{[6
]}

Crowley, J. N. ^{[7
]}

Dorn, H. -P. ^{[1
]}

Dube, W. P. ^{[2
,5
]}

Fry, J. L. ^{[6
]}

Haeseler, R. ^{[1
]}

Kajii, Y. ^{[8
]}

Kiendler-Scharr, A. ^{[1
]}

Labazan, I. ^{[7
]}

Matsumoto, J. ^{[8
]}

Mentel, T. F. ^{[1
]}

Nakashima, Y. ^{[8
]}

Rohrer, F. ^{[1
]}

Rollins, A. W. ^{[6
]}

Schuster, G. ^{[7
]}

Tillmann, R. ^{[1
]}

Wahner, A. ^{[1
]}

Wooldridge, P. J. ^{[6
]}

Brown, S. S. ^{[5
]}

机构：

[1] Forschungszentrum Julich, Inst Energy & Climate Res, IEK Troposphere 8, D-52425 Julich, Germany

[2] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[3] Univ Alaska Fairbanks, Dept Chem & Biochem, Fairbanks, AK USA

[4] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA

[5] NOAA, Earth Syst Res Lab, Boulder, CO USA

[6] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[7] Max Planck Inst Chem, D-6500 Mainz, Germany

[8] Tokyo Metropolitan Univ, Dept Appl Chem, Tokyo 158, Japan

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2012年 / 5卷 / 11期

基金：

美国国家科学基金会; 美国能源部;

关键词：

LASER-INDUCED FLUORESCENCE; NOCTURNAL NITROGEN-OXIDES; SIMULATION CHAMBER SAPHIR; IN-SITU DETECTION; ABSORPTION-SPECTROSCOPY; HETEROGENEOUS HYDROLYSIS; DINITROGEN PENTOXIDE; RADICAL MEASUREMENTS; NO3; NITRATE;

D O I：

10.5194/amt-5-2763-2012

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

N2O5 detection in the atmosphere has been accomplished using techniques which have been developed during the last decade. Most techniques use a heated inlet to thermally decompose N2O5 to NO3, which can be detected by either cavity based absorption at 662 nm or by laser-induced fluorescence. In summer 2007, a large set of instruments, which were capable of measuring NO3 mixing ratios, were simultaneously deployed in the atmosphere simulation chamber SAPHIR in Julich, Germany. Some of these instruments measured N2O5 mixing ratios either simultaneously or alternatively. Experiments focused on the investigation of potential interferences from, e. g., water vapour or aerosol and on the investigation of the oxidation of biogenic volatile organic compounds by NO3. The comparison of N2O5 mixing ratios shows an excellent agreement between measurements of instruments applying different techniques (3 cavity ring-down (CRDS) instruments, 2 laser-induced fluorescence (LIF) instruments). Datasets are highly correlated as indicated by the square of the linear correlation coefficients, R-2, which values were larger than 0.96 for the entire datasets. N2O5 mixing ratios well agree within the combined accuracy of measurements. Slopes of the linear regression range between 0.87 and 1.26 and intercepts are negligible. The most critical aspect of N2O5 measurements by cavity ring-down instruments is the determination of the inlet and filter transmission efficiency. Measurements here show that the N2O5 inlet transmission efficiency can decrease in the presence of high aerosol loads, and that frequent filter/inlet changing is necessary to quantitatively sample N2O5 in some environments. The analysis of data also demonstrates that a general correction for degrading filter transmission is not applicable for all conditions encountered during this campaign. Besides the effect of a gradual degradation of the inlet transmission efficiency aerosol exposure, no other interference for N2O5 measurements is found.

引用

页码：2763 / 2777

页数：15

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