Marine boundary layer peroxy radical chemistry during the AEROSOLS99 campaign: Measurements and analysis

Hernández, Maria Dolores Andrés; Burkert, J.; Reichert, L.; Stöbener, Dirk; Meyer-Arnek, Julian; Burrows, J. P.; Dickerson, Russell R.; Doddridge, Bruce G.

doi:10.1029/2001jd900113

Cited by 35 publications

(28 citation statements)

References 50 publications

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“…Since this technique was proposed by Cantrell and Stedman (1982) and calibrated by Hastie et al (1991), there is abundant literature describing its gradual improvement and characterisation for the ambient measurement of peroxy radicals, and its deployment in diverse polluted and remote areas (e.g. Monks et al, 1996;Carslaw et al, 1999;Burkert et al, 2001aBurkert et al, , b, 2003Andrés-Hernández et al, 2001;Cantrell et al, 1996a;Volz-Thomas et al, 2003;Zanis et al, 2003;Fleming et al, 2006a, b).…”

Section: Kartal Et Al: Characterisation Of a Dualer For Airborne mentioning

confidence: 99%

Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006

et al. 2010

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Abstract.A DUALER (dual-channel airborne peroxy radical chemical amplifier) instrument has been developed and optimised for the airborne measurement of the total sum of peroxy radicals during the AMMA (African Monsoon Multidisciplinary Analyses) measurement campaign which took place in Burkina Faso in August 2006. The innovative feature of the instrument is that both reactors are sampling simultaneously from a common pre-reactor nozzle while the whole system is kept at a constant pressure to ensure more signal stability and accuracy.Laboratory experiments were conducted to characterise the stability of the NO 2 detector signal and the chain length with the pressure. The results show that airborne measurements using chemical amplification require constant pressure at the luminol detector. Wall losses of main peroxy radicals HO 2 and CH 3 O 2 were investigated. The chain length was experimentally determined for different ambient mixtures and compared with simulations performed by a chemical box model.The DUALER instrument was successfully mounted within the German DLR-Falcon. The analysis of AMMA data utilises a validation procedure based on the O 3 mixing ratios simultaneously measured onboard. The validation and analysis procedure is illustrated by means of the data measured during the AMMA campaign. The detection limit and the accuracy of the ambient measurements are also discussed.

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Section: Kartal Et Al: Characterisation Of a Dualer For Airborne mentioning

confidence: 99%

Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006

et al. 2010

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“…The airborne DUALER deployed on the D-Falcon has been developed by IUP-UB from the first calibrated PeRCA (Hastie et al, 1990) which has been gradually improved and implemented in several campaigns and comparison exercises for ground based measurements (Zenker et al, 1998;Andrés Hernández et al, 2001;Burkert et al, 2001aBurkert et al, , b, 2003. This instrument bases on the concept described in Sect.…”

Section: Dualer (Dual Channel Airborne Peroxy Radical Chemical Amplifmentioning

confidence: 99%

Peroxy radical partitioning during the AMMA radical intercomparison exercise

et al. 2010

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Abstract. Peroxy radicals were measured onboard two scientific aircrafts during the AMMA (African Monsoon Multidisciplinary Analysis) campaign in summer 2006. This paper reports results from the flight on 16 August 2006 during which measurements of HO 2 by laser induced fluorescence spectroscopy at low pressure (LIF-FAGE) and total peroxy radicals (RO * 2 = HO 2 + RO 2 , R = organic chain) by two similar instruments based on the peroxy radical chemical amplification (PeRCA) technique were subject of a blind intercomparison. The German DLR-Falcon and the British FAAM-BAe-146 flew wing tip to wing tip for about 30 min making concurrent measurements on 2 horizontal level runs at 697 and 485 hPa over the same geographical area in Burkina Faso. A full set of supporting measurements comprising photolysis frequencies, and relevant trace gases like CO, NO, NO 2 , NO y , O 3 and a wider range of VOCs were collected simultaneously.Results are discussed on the basis of the characteristics and limitations of the different instruments used. Generally, no data bias are identified and the RO * 2 data available agree quite reasonably within the instrumental errors.

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“…Solberg et al (2001) found that formaldehyde concentrations at Mace Head, Ireland and at two stations in Germany and Norway were highest in the summer and that the amount of formaldehyde photolysed was also higher in the summer. Both Burkert et al (2003), during the INDOEX (INDian Ocean EXperiment) and Hernández et al (2001), during the AEROSOLS99 campaign in the Atlantic ocean found the broad RO 2 diurnal cycle to coincide with increased amounts of formaldehyde.…”

Section: Diurnal Variations Of Peroxy Radicalsmentioning

confidence: 99%

Seasonal dependence of peroxy radical concentrations at a Northern hemisphere marine boundary layer site during summer and winter: evidence for radical activity in winter

et al. 2006

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Abstract. Peroxy radicals (HO 2 + RO 2 ) were measured at the Weybourne Atmospheric Observatory (52 • N, 1 • E), Norfolk using a PEroxy Radical Chemical Amplifier (PERCA) during the winter and summer of 2002. The peroxy radical diurnal cycles showed a marked difference between the winter and summer campaigns with maximum concentrations of 12 pptv at midday in the summer and maximum concentrations as high as 30 pptv (10 min averages) in winter at night. The corresponding nighttime peroxy radical concentrations were not as high in summer (3 pptv). The peroxy radical concentration shows a distinct anti-correlation with increasing NO x during the daylight hours. At night, peroxy radicals increase with increasing NO x indicative of the role of NO 3 chemistry. The average diurnal cycles for net ozone production, N(O 3 ) show a large variability in ozone production, P(O 3 ), and a large ozone loss, L(O 3 ) in summer relative to winter. For a daylight average, net ozone production in summer was higher than winter (1.51±0.5 ppbv h −1 and 1.11±0.47 ppbv h −1 , respectively). The variability in NO concentration has a much larger effect on N(O 3 ) than the peroxy radical concentrations. Photostationary state (PSS) calculations show an NO 2 lifetime of 5 min in summer and 21 minutes in the winter, implying that steady-state NO-NO 2 ratios are not always attained during the winter months. The results show an active peroxy radical chemistry at night and that significant oxidant levels are sustained in winter. The net effect of this with respect to production of ozone in winter is unclear owing to the breakdown in the photostationary state.

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Marine boundary layer peroxy radical chemistry during the AEROSOLS99 campaign: Measurements and analysis

Cited by 35 publications

References 50 publications

Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006

Technical Note: Characterisation of a DUALER instrument for the airborne measurement of peroxy radicals during AMMA 2006

Peroxy radical partitioning during the AMMA radical intercomparison exercise

Seasonal dependence of peroxy radical concentrations at a Northern hemisphere marine boundary layer site during summer and winter: evidence for radical activity in winter

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