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000186715 0247_ $$2doi$$a10.5194/acp-15-799-2015
000186715 0247_ $$2ISSN$$a1680-7316
000186715 0247_ $$2ISSN$$a1680-7324
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000186715 037__ $$aFZJ-2015-00787
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000186715 1001_ $$0P:(DE-HGF)0$$aOswald, R.$$b0$$eCorresponding Author
000186715 245__ $$aA comparison of HONO budgets for two measurement heights at a field station within the boreal forest in Finland
000186715 260__ $$aKatlenburg-Lindau$$bEGU$$c2015
000186715 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1422019209_24935
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000186715 520__ $$aAtmospheric concentrations of nitrous acid (HONO), one of the major precursors of the hydroxyl radical (OH) in the troposphere, significantly exceed the values predicted by the assumption of a photostationary state (PSS) during daytime. Therefore, additional sources of HONO were intensively investigated in the last decades. This study presents budget calculations of HONO based on simultaneous measurements of all relevant species, including HONO and OH at two different measurement heights, i.e. 1 m above the ground and about 2 to 3 m above the canopy (24 m above the ground), conducted in a boreal forest environment. We observed mean HONO concentrations of about 6.5 × 108 molecules cm−3 (26 ppt) during daytime, more than 20 times higher than expected from the PSS of 0.2 × 108 molecules cm−3 (1 ppt). To close the budgets at both heights, a strong additional source term during daytime is required. This unidentified source is at its maximum at noon (up to 1.1 × 106 molecules cm−3 s−1, 160 ppt h−1) and in general up to 2.3 times stronger above the canopy than close to the ground. The insignificance of known gas phase reactions and other processes like dry deposition or advection compared to the photolytic decomposition of HONO at this measurement site was an ideal prerequisite to study possible correlations of this unknown term to proposed HONO sources. But neither the proposed emissions from soils nor the proposed photolysis of adsorbed HNO3 contributed substantially to the unknown source. However, the unknown source was found to be perfectly correlated to the unbalanced photolytic loss of HONO.
000186715 536__ $$0G:(DE-HGF)POF3-243$$a243 - Tropospheric trace substances and their transformation processes (POF3-243)$$cPOF3-243$$fPOF III$$x0
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000186715 7001_ $$0P:(DE-HGF)0$$aErmel, M.$$b1
000186715 7001_ $$0P:(DE-HGF)0$$aHens, K.$$b2
000186715 7001_ $$0P:(DE-HGF)0$$aNovelli, A.$$b3
000186715 7001_ $$0P:(DE-HGF)0$$aOuwersloot, H. G.$$b4
000186715 7001_ $$0P:(DE-HGF)0$$aPaasonen, P.$$b5
000186715 7001_ $$0P:(DE-HGF)0$$aPetäjä, T.$$b6
000186715 7001_ $$0P:(DE-HGF)0$$aSipilä, M.$$b7
000186715 7001_ $$0P:(DE-HGF)0$$aKeronen, P.$$b8
000186715 7001_ $$0P:(DE-HGF)0$$aBäck, J.$$b9
000186715 7001_ $$0P:(DE-HGF)0$$aKönigstedt, R.$$b10
000186715 7001_ $$0P:(DE-HGF)0$$aHosaynali Beygi, Z.$$b11
000186715 7001_ $$0P:(DE-HGF)0$$aFischer, H.$$b12
000186715 7001_ $$0P:(DE-Juel1)2693$$aBohn, B.$$b13$$ufzj
000186715 7001_ $$0P:(DE-HGF)0$$aKubistin, D.$$b14
000186715 7001_ $$0P:(DE-HGF)0$$aHarder, H.$$b15
000186715 7001_ $$0P:(DE-HGF)0$$aMartinez, M.$$b16
000186715 7001_ $$0P:(DE-HGF)0$$aWilliams, J.$$b17
000186715 7001_ $$0P:(DE-HGF)0$$aHoffmann, T.$$b18
000186715 7001_ $$0P:(DE-HGF)0$$aTrebs, I.$$b19
000186715 7001_ $$0P:(DE-HGF)0$$aSörgel, M.$$b20
000186715 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-15-799-2015$$gVol. 15, no. 2, p. 799 - 813$$n2$$p799 - 813$$tAtmospheric chemistry and physics$$v15$$x1680-7324$$y2015
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000186715 9130_ $$0G:(DE-HGF)POF2-233$$1G:(DE-HGF)POF2-230$$2G:(DE-HGF)POF2-200$$aDE-HGF$$bErde und Umwelt$$lAtmosphäre und Klima$$vTrace gas and aerosol processes in the troposphere$$x0
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