Contribution of Isoprene Oxidation Products to Marine Aerosol over the North‐East Atlantic

Anttila, T.; Langmann, Bärbel; Varghese, Saji; O’Dowd, Colin

doi:10.1155/2010/482603

Cited by 17 publications

(21 citation statements)

References 34 publications

(56 reference statements)

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“…If we apply the average levels of SOAs over remote oceans, 4–7 days as the lifetimes of tropospheric particles46, 600–1000 m as the boundary layer height12, the isoprene SOA yield of 2% and the monoterpene SOA yield of 32%42, the estimated sea-air fluxes are 13–38 μg m −2 d −1 for isoprene and 0.27–0.78 μg m −2 d −1 for monoterpenes. These isoprene fluxes were similar to the model result of ~10−100 μg m −2 d −1 over the North Atlantic47. Consequently, the global oceanic emissions of isoprene and monoterpenes are about 1.5–4.4 TgC yr −1 and 0.031–0.091 TgC yr −1 , respectively.…”

Section: Discussionsupporting

confidence: 85%

Secondary organic aerosols over oceans via oxidation of isoprene and monoterpenes from Arctic to Antarctic

Xie

Wang

et al. 2013

Sci Rep

125

114

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Isoprene and monoterpenes are important precursors of secondary organic aerosols (SOA) in continents. However, their contributions to aerosols over oceans are still inconclusive. Here we analyzed SOA tracers from isoprene and monoterpenes in aerosol samples collected over oceans during the Chinese Arctic and Antarctic Research Expeditions. Combined with literature reports elsewhere, we found that the dominant tracers are the oxidation products of isoprene. The concentrations of tracers varied considerably. The mean average values were approximately one order of magnitude higher in the Northern Hemisphere than in the Southern Hemisphere. High values were generally observed in coastal regions. This phenomenon was ascribed to the outflow influence from continental sources. High levels of isoprene could emit from oceans and consequently have a significant impact on marine SOA as inferred from isoprene SOA during phytoplankton blooms, which may abruptly increase up to 95 ng/m3 in the boundary layer over remote oceans.

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Section: Discussionsupporting

confidence: 85%

Secondary organic aerosols over oceans via oxidation of isoprene and monoterpenes from Arctic to Antarctic

Xie

Wang

et al. 2013

Sci Rep

125

114

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“…The total concentrations of isoprene SOA tracers ranged from 0.11 to 22 ng m −3 (3.6 ng m −3 ), accounting for 0.48–29% (10%) of the total identified organics. Over the North Atlantic Ocean, the concentrations of isoprene SOA tracers (0.20–0.54 ng m −3 ) were lower than those by a recent model estimate (up to 5 ng m −3 ) during a period of high biological activity [ Anttila et al , 2010]. This is reasonable because our samples were mainly collected in winter, when marine emissions of isoprene should be negligible.…”

Section: Resultsmentioning

confidence: 54%

Molecular characterization of marine organic aerosols collected during a round-the-world cruise

2011

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[1] Organic molecular compositions of marine aerosol samples, collected at low latitudes to midlatitudes in the Northern Hemisphere during a round-the-world cruise, were studied using gas chromatography/mass spectrometry. More than 140 organic species were detected in the samples and were grouped into different compound classes based on the functionality and sources. The concentrations of total quantified organics ranged from 0.94 to 111 ng m −3 (average of 34 ng m −3 ). Biogenic secondary organic aerosol (SOA) tracers from the oxidation of isoprene (e.g., 2-methyltetrols), a/b-pinene (e.g., pinonic and pinic acids), and b-caryophyllene (b-caryophyllinic acid) were detected in all the samples. Their total concentrations ranged from 0.19 to 27 ng m , which account for 0.48-29% of the total identified organics and 0.05-1.5% of organic carbon in the marine aerosols. The spatial distributions of biogenic SOA tracers exhibited higher loadings over the coastal/tropical regions than the open oceans. In marine aerosols collected over the North Pacific and North Atlantic, the contributions of marine natural emissions (22-33%) were higher than those in the coastal regions (4-14%). Over the tropical regions, atmospheric oxidation products can account for 47-59% of the total organics, with biomass burning emissions of only 1-2%. However, over the western North Pacific, fossil fuel combustion (26%), atmospheric oxidation products (25%), and biomass burning (24%) were the main sources. This study indicates that long-range atmospheric transport of continental aerosols and sea-to-air emission of marine organics, as well as atmospheric oxidation and/or photochemical aging, are important factors controlling the chemical composition of organic aerosols in the marine atmosphere.

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“…Marine-derived isoprene emissions only account for a few percent of the total emissions and are suggested, based on model studies, to be generally lower than 1 Tg C yr −1 (Palmer and Shaw, 2005;Arnold et al, 2009;Gantt et al, 2009;Booge et al, 2016). Some model studies suggest that these low emissions are not enough to control the formation of SOAs over the ocean (Spracklen et al, 2008;Arnold et al, 2009;Gantt et al, 2009;Anttila et al, 2010;Myriokefalitakis et al, 2010). However, due to its short atmospheric lifetime of minutes to a few hours, terrestrial isoprene does not reach the atmosphere over remote regions of the oceans.…”

Section: Introductionmentioning

confidence: 99%

Marine isoprene production and consumption in the mixed layer of the surface ocean – a field study over two oceanic regions

et al. 2018

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Abstract. Parameterizations of surface ocean isoprene concentrations are numerous, despite the lack of source/sink process understanding. Here we present isoprene and related field measurements in the mixed layer from the Indian Ocean and the eastern Pacific Ocean to investigate the production and consumption rates in two contrasting regions, namely oligotrophic open ocean and the coastal upwelling region. Our data show that the ability of different phytoplankton functional types (PFTs) to produce isoprene seems to be mainly influenced by light, ocean temperature, and salinity.Our field measurements also demonstrate that nutrient availability seems to have a direct influence on the isoprene production. With the help of pigment data, we calculate in-field isoprene production rates for different PFTs under varying biogeochemical and physical conditions. Using these new calculated production rates, we demonstrate that an additional significant and variable loss, besides a known chemical loss and a loss due to air-sea gas exchange, is needed to explain the measured isoprene concentration. We hypothesize that this loss, with a lifetime for isoprene between 10 and 100 days depending on the ocean region, is potentially due to degradation or consumption by bacteria.

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Contribution of Isoprene Oxidation Products to Marine Aerosol over the North‐East Atlantic

Cited by 17 publications

References 34 publications

Secondary organic aerosols over oceans via oxidation of isoprene and monoterpenes from Arctic to Antarctic

Secondary organic aerosols over oceans via oxidation of isoprene and monoterpenes from Arctic to Antarctic

Molecular characterization of marine organic aerosols collected during a round-the-world cruise

Marine isoprene production and consumption in the mixed layer of the surface ocean – a field study over two oceanic regions

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