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The MILAN campaign: Studying diel light effects on the air-sea interface

Stolle, C.; Ribas-Ribas, M.; Badewien, T.H.; Barnes, J.; Carpenter, L.J.; Chance, R.; Riis Damgaard, L.; Durán Quesada, A.M.; Engel, A.; Frka, S.; Galgani, L.; Gašparović, Blaženka; Gerriets, M.; Hamizah Mustaffa, N.I.; Herrmann, H.; Kallajoki, L.; Pereira, R.; Radach, F.; Revsbech, N.P.; Rickard, P.; Saint, A.; Salter, M.; Striebel, M.; Triesch, N.; Uher, G.; Upstill-Goddard, R.C.; van Pinxteren, M.; Zäncker, B.; Zieger, P.; Wurl, O. (2020) The MILAN campaign: Studying diel light effects on the air-sea interface. Bulletin of the American Meteorological Society, 101 . pp. 146-166. ISSN 0003-0007

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The sea surface microlayer (SML) at the air–sea interface is <1 mm thick, but it is physically, chemically, and biologically distinct from the underlying water and the atmosphere above. Wind-driven turbulence and solar radiation are important drivers of SML physical and biogeochemical properties. Given that the SML is involved in all air–sea exchanges of mass and energy, its response to solar radiation, especially in relation to how it regulates the air–sea exchange of climate-relevant gases and aerosols, is surprisingly poorly characterized. MILAN (Sea Surface Microlayer at Night) was an international, multidisciplinary campaign designed to specifically address this issue. In spring 2017, we deployed diverse sampling platforms (research vessels, radio-controlled catamaran, free-drifting buoy) to study full diel cycles in the coastal North Sea SML and in underlying water, and installed a land-based aerosol sampler. We also carried out concurrent ex situ experiments using several microsensors, a laboratory gas exchange tank, a solar simulator, and a sea spray simulation chamber. In this paper we outline the diversity of approaches employed and some initial results obtained during MILAN. Our observations of diel SML variability show, for example, an influence of (i) changing solar radiation on the quantity and quality of organic material and (ii) diel changes in wind intensity primarily forcing air–sea CO2 exchange. Thus, MILAN underlines the value and the need of multidiciplinary campaigns for integrating SML complexity into the context of air–sea interaction.

Item Type: Article
Uncontrolled Keywords: sea surface miscrolayers ; diel light effect aerosol ; North Sea ; aerosol ; chemistry ; microbiology ;
Subjects: NATURAL SCIENCES > Chemistry
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Utjecaj okolišnog stresa na pojavnost i međudjelovanje biološki važnih organskih molekula i mikronutrijenata u morskom ekosustavu-AMBIOMERESBlaženka GašparovićIP-2013-11-8607HRZZ
Chemical nature of size segregated water soluble organic aerosols and their nitro-aromatic constituents (FP7-PEOPLE-2011-COFUND, GA 47)UNSPECIFIEDNEWFELPRO 0452009UNSPECIFIED
Depositing User: Blaženka Gašparović
Date Deposited: 19 Mar 2020 14:21
DOI: 10.1175/BAMS-D-17-0329.1

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