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000006107 084__ $$2WoS$$aMeteorology & Atmospheric Sciences
000006107 1001_ $$0P:(DE-Juel1)VDB26256$$aSchlosser, E.$$b0$$uFZJ
000006107 245__ $$aTechnical Note: Formal blind intercomparison of OH measurements: results from the international campaign HOxComp
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000006107 440_0 $$09601$$aAtmospheric Chemistry and Physics$$v9$$x1680-7316$$y20
000006107 500__ $$aThis work was supported by the EU FP-6 program EUROCHAMP (grant no. RII3-CT-2004-505968) and ACCENT (Priority 1.1.6.3. Global Change and Ecosystems, grant no. GOCE-CT-2004-505337).We thank F. Rohrer, R. Tillmann, and B. Bohn for helpful discussions and supporting measurements, and F. J. Johnen for assistance with the experiments.
000006107 520__ $$aHydroxyl radicals (OH) are the major oxidizing species in the troposphere. Because of their central importance, absolute measurements of their concentrations are needed to validate chemical mechanisms of atmospheric models. The extremely low and highly variable concentrations in the troposphere, however, make measurements of OH difficult. Three techniques are currently used worldwide for tropospheric observations of OH after about 30 years of technical developments: Differential Optical Laser Absorption Spectroscopy (DOAS), Laser-Induced Fluorescence Spectroscopy (LIF), and Chemical Ionisation Mass Spectrometry (CIMS). Even though many measurement campaigns with OH data were published, the question of accuracy and precision is still under discussion.Here, we report results of the first formal, blind intercomparison of these techniques. Six OH instruments (4 LIF, 1 CIMS, 1 DOAS) participated successfully in the ground-based, international HOxComp campaign carried out in Julich, Germany, in summer 2005. Comparisons were performed for three days in ambient air (3 LIF, 1 CIMS) and for six days in the atmosphere simulation chamber SAPHIR (3 LIF, 1 DOAS). All instruments were found to measure tropospheric OH concentrations with high sensitivity and good time resolution. The pairwise correlations between different data sets were linear and yielded high correlation coefficients (r(2)=0.75-0.96). Excellent absolute agreement was observed for the instruments at the SAPHIR chamber, yielding slopes between 1.01 and 1.13 in the linear regressions. In ambient air, the slopes deviated from unity by factors of 1.06 to 1.69, which can partly be explained by the stated instrumental accuracies. In addition, sampling inhomogeneities and calibration problems have apparently contributed to the discrepancies. The absolute intercepts of the linear regressions did not exceed 0.6x106 cm(-3), mostly being insignificant and of minor importance for daytime observations of OH. No relevant interferences with respect to ozone, water vapour, NOx and peroxy radicals could be detected. The HOxComp campaign has demonstrated that OH can be measured reasonably well by current instruments, but also that there is still room for improvement of calibrations.
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000006107 7001_ $$0P:(DE-Juel1)16306$$aBrauers, T.$$b1$$uFZJ
000006107 7001_ $$0P:(DE-Juel1)16317$$aDorn, H.-P.$$b2$$uFZJ
000006107 7001_ $$0P:(DE-Juel1)7363$$aFuchs, H.$$b3$$uFZJ
000006107 7001_ $$0P:(DE-Juel1)5628$$aHäseler, R.$$b4$$uFZJ
000006107 7001_ $$0P:(DE-Juel1)16326$$aHofzumahaus, A.$$b5$$uFZJ
000006107 7001_ $$0P:(DE-Juel1)16342$$aHolland, F.$$b6$$uFZJ
000006107 7001_ $$0P:(DE-Juel1)16324$$aWahner, A.$$b7$$uFZJ
000006107 7001_ $$0P:(DE-HGF)0$$aKanaya, Y.$$b8
000006107 7001_ $$0P:(DE-HGF)0$$aKajii, Y.$$b9
000006107 7001_ $$0P:(DE-HGF)0$$aMiyamoto, K.$$b10
000006107 7001_ $$0P:(DE-HGF)0$$aNishida, S.$$b11
000006107 7001_ $$0P:(DE-HGF)0$$aWatanabe, K.$$b12
000006107 7001_ $$0P:(DE-HGF)0$$aYoshino, A.$$b13
000006107 7001_ $$0P:(DE-HGF)0$$aKubistin, D.$$b14
000006107 7001_ $$0P:(DE-HGF)0$$aMartinez, M.$$b15
000006107 7001_ $$0P:(DE-HGF)0$$aRudolf, N.$$b16
000006107 7001_ $$0P:(DE-HGF)0$$aHarder, H.$$b17
000006107 7001_ $$0P:(DE-HGF)0$$aBerresheim, H.$$b18
000006107 7001_ $$0P:(DE-HGF)0$$aElste, T.$$b19
000006107 7001_ $$0P:(DE-HGF)0$$aPlass-Dülmer, C.$$b20
000006107 7001_ $$0P:(DE-HGF)0$$aStange, G.$$b21
000006107 7001_ $$0P:(DE-HGF)0$$aSchurath, U.$$b22
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