This title appears in the Scientific Report :
2007
Please use the identifier:
http://dx.doi.org/10.1007/s10874-006-9049-3 in citations.
Intercomparison of Two Hydroxyl Radical Measurement Techniques at the Atmosphere Simulation Chamber SAPHIR
Intercomparison of Two Hydroxyl Radical Measurement Techniques at the Atmosphere Simulation Chamber SAPHIR
At the atmosphere simulation chamber SAPHIR in Julich both Laser-Induced Fluorescence Spectroscopy (LIF) and Long-Path Differential Optical Laser Absorption Spectroscopy (DOAS) are operational for the detection of OH radicals at tropospheric levels. The two different spectroscopic techniques were co...
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Personal Name(s): | Schlosser, E. |
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Bohn, B. / Brauers, T. / Dorn, H. P. / Fuchs, H. / Häseler, R. / Hofzumahaus, A. / Holland, F. / Rohrer, F. / Rupp, L. / Siese, M. / Tillmann, R. / Wahner, A. | |
Contributing Institute: |
Troposphäre; ICG-2 Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM JARA-ENERGY; JARA-ENERGY |
Published in: | Journal of atmospheric chemistry, 56 (2007) S. 187 - 205 |
Imprint: |
Dordrecht [u.a.]
Springer Science + Business Media B.V
2007
|
Physical Description: |
187 - 205 |
DOI: |
10.1007/s10874-006-9049-3 |
Document Type: |
Journal Article |
Research Program: |
Atmosphäre und Klima |
Series Title: |
Journal of Atmospheric Chemistry
56 |
Subject (ZB): | |
Publikationsportal JuSER |
At the atmosphere simulation chamber SAPHIR in Julich both Laser-Induced Fluorescence Spectroscopy (LIF) and Long-Path Differential Optical Laser Absorption Spectroscopy (DOAS) are operational for the detection of OH radicals at tropospheric levels. The two different spectroscopic techniques were compared within the controlled environment of SAPHIR based on all simultaneous measurements acquired in 2003 ( 13 days). Hydroxyl radicals were scavenged by added CO during four of these days in order to experimentally check the calculated precisions at the detection limit. LIF measurements have a higher precision (sigma = 0.88 x 10(6) cm(-3)) and better time resolution (Delta t = 60 s), but the DOAS method (sigma = 1.24 x 10(6) cm(-3), Delta t = 135 s) is regarded as primary standard for comparisons because of its good accuracy. A high correlation coefficient of r = 0.95 was found for the whole data set highlighting the advantage of using a simulation chamber. The data set consists of two groups. The first one includes 3 days, where the LIF measurements yield ( 1 2) x 10(6) cm(-3) higher OH concentrations than observed by the DOAS instrument. The experimental conditions during these days are characterized by increased NOx concentration and a small dynamic range in OH. Excellent agreement is found within the other group of 6 days. The regression to the combined data of this large group yields unity slope without a significant offset. |