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ACE-2 HILLCLOUD. An...
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Bower, K. N.University of Manchester
(author)
ACE-2 HILLCLOUD. An overview of the ACE-2 ground-based cloud experiment
- Article/chapterEnglish2000
Publisher, publication year, extent ...
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Stockholm University Press,2000
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29 s.
Numbers
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LIBRIS-ID:oai:lup.lub.lu.se:a079e866-4f19-41de-ab9b-d0965d749122
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https://lup.lub.lu.se/record/a079e866-4f19-41de-ab9b-d0965d749122URI
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https://doi.org/10.1034/j.1600-0889.2000.00027.xDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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The ACE-2 HILLCLOUD experiment was carried out on the island of Tenerife in June-July 1997 to investigate the interaction of the boundary layer aerosol with a hill cap cloud forming over a ridge to the north-east of the island. The cloud was used as a natural flow through reactor to investigate the dependence of the cloud microphysics and chemistry on the characteristics of the aerosols and trace gases entering cloud, and to simultaneously study the influence of the physical and chemical processes occurring within the cloud on the size distribution, chemical and hygroscopic properties of the aerosol exiting cloud. 5 major ground base sites were used, measuring trace gases and aerosols upwind and downwind of the cloud, and cloud microphysics and chemistry and interstitial aerosol and gases within the cloud on the hill. 8 intensive measurement periods or runs were undertaken during cloud events, (nocturnally for seven of the eight runs) and were carried out in a wide range of airmass conditions from clean maritime to polluted continental. Polluted air was characterised by higher than average concentrations of ozone (> 50 ppbv), fine and accumulation mode aerosols (> 3000 and > 1500 cm -3 , respectively) and higher aerosol mass loadings. Cloud droplet number concentrations N, increased from 50 cm -3 in background maritime air to > 2500 cm -3 in aged polluted continental air, a concentration much higher than had previously been detected. Surprisingly, N was seen to vary almost linearly with aerosol number across this range. The droplet aerosol analyser (DAA) measured higher droplet numbers than the corrected forward scattering spectrometer probe (FSSP) in the most polluted air, but at other times there was good agreement (FSSP = 0.95 DAA with an r 2 = 0.89 for N < 1200 cm -3 ). Background ammonia gas concentrations were around 0.3 ppbv even in air originating over the ocean, another unexpected but important result for the region. NO 2 was present in background concentrations of typically 15 pptv to 100 pptv and NO 3 . (the nitrate radical) was observed at night throughout. Calculations suggest NO 3 . losses were mainly by reaction with DMS to produce nitric acid. Low concentrations of SO 2 (~30 pptv), HNO 3 and HCl were always present. HNO 3 concentrations were higher in polluted episodes and calculations implied that these exceeded those which could be accounted for by NO 2 oxidation. It is presumed that nitric and hydrochloric acids were present as a result of outgassing from aerosol, the HNO 3 from nitrate rich aerosol transported into the region from upwind of Tenerife, and HCl from sea salt aerosol newly formed at the sea surface. The oxidants hydrogen peroxide and ozone were abundant (i.e., were well in excess over SO 2 throughout the experiment). Occasions of significant aerosol growth following cloud processing were observed, particularly in cleaner cases. Observations and modelling suggested this was due mainly to the take up of nitric acid, hydrochloric acid and ammonia by the smallest activated aerosol particles. On a few occasions a small contribution was made by the in-cloud oxidation of S(IV). The implications of these results from HILLCLOUD for the climatologically more important stratocumulus Marine Boundary Layer (MBL) clouds are considered.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Choularton, T. W.University of Manchester
(author)
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Gallagher, M. W.University of Manchester
(author)
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Beswick, K. M.University of Manchester
(author)
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Flynn, M. J.University of Manchester
(author)
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Allen, A. G.University of Birmingham
(author)
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Davison, B. M.Lancaster University
(author)
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James, J. D.University of Birmingham
(author)
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Robertson, L.Lancaster University
(author)
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Harrison, R. M.University of Birmingham
(author)
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Hewitt, C. N.Lancaster University
(author)
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Cape, J. N.Centre for Ecology & Hydrology, Wallingford
(author)
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McFadyen, G. G.Centre for Ecology & Hydrology, Wallingford
(author)
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Milford, C.Centre for Ecology & Hydrology, Wallingford
(author)
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Sutton, M. A.Centre for Ecology & Hydrology, Wallingford
(author)
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Martinsson, B. G.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-bma
(author)
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Frank, G.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-gfr
(author)
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Swietlicki, E.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-esw
(author)
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Zhou, J.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-jzh
(author)
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Berg, O. H.Lund University
(author)
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Mentes, B.Lund University
(author)
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Papaspiropoulos, G.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-gpa
(author)
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Hansson, H. C.Stockholm University
(author)
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Leck, C.Stockholm University
(author)
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Kulmala, M.University of Helsinki
(author)
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Aalto, P.University of Helsinki
(author)
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Väkevä, M.University of Helsinki
(author)
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Berner, A.University of Vienna
(author)
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Bizjak, M.National Institute of Chemistry
(author)
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Fuzzi, S.CNR Institute of Atmospheric Sciences and Climate (CNR-ISAC)
(author)
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Laj, P.CNR Institute of Atmospheric Sciences and Climate (CNR-ISAC)
(author)
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Facchini, M. C.CNR Institute of Atmospheric Sciences and Climate (CNR-ISAC)
(author)
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Orsi, G.CNR Institute of Atmospheric Sciences and Climate (CNR-ISAC)
(author)
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Ricci, L.CNR Institute of Atmospheric Sciences and Climate (CNR-ISAC)
(author)
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Nielsen, M.Technical University of Denmark(Swepub:lu)maxl-mns
(author)
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Allan, B. J.University of East Anglia
(author)
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Coe, H.University of East Anglia
(author)
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McFiggans, G.University of East Anglia
(author)
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Plane, J. M.C.University of East Anglia
(author)
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Collett, J. L.Colorado State University
(author)
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Moore, K. F.Colorado State University
(author)
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Sherman, D. E.Colorado State University
(author)
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University of ManchesterUniversity of Birmingham
(creator_code:org_t)
Related titles
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In:Tellus. Series B: Chemical and Physical Meteorology: Stockholm University Press52:2, s. 750-7780280-6509
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In:Tellus B: Stockholm University Press52:2, s. 750-7781600-0889
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Bower, K. N.
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Choularton, T. W ...
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Gallagher, M. W.
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Beswick, K. M.
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Flynn, M. J.
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Allen, A. G.
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show more...
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Davison, B. M.
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James, J. D.
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Robertson, L.
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Harrison, R. M.
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Hewitt, C. N.
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Cape, J. N.
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McFadyen, G. G.
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Milford, C.
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Sutton, M. A.
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Martinsson, B. G ...
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Frank, G.
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Swietlicki, E.
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Zhou, J.
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Berg, O. H.
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Mentes, B.
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Papaspiropoulos, ...
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Hansson, H. C.
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Leck, C.
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Kulmala, M.
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Aalto, P.
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Väkevä, M.
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Berner, A.
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Bizjak, M.
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Fuzzi, S.
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Laj, P.
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Facchini, M. C.
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Orsi, G.
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Ricci, L.
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Nielsen, M.
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Allan, B. J.
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Coe, H.
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McFiggans, G.
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Plane, J. M.C.
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Collett, J. L.
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Moore, K. F.
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Sherman, D. E.
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