Impact of the marine atmospheric boundary layer conditions on VSLS abundances in the eastern tropical and subtropical North Atlantic Ocean

Fuhlbrügge, Steffen; Krüger, Kirstin; Quack, Birgit; Atlas, Elliot L.; Hepach, Helmke; Ziska, F.

doi:10.5194/acp-13-6345-2013

Cited by 33 publications

(74 citation statements)

References 40 publications

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“…Previous studies have hypothesized that elevated atmospheric mixing ratios of CHBr 3 and CH 2 Br 2 above the Mauritanian upwelling area were mainly of continental origin, since sea-to-air fluxes of these compounds appeared not sufficient to explain the observations (Quack et al, 2007a;Carpenter et al, 2009). In contrast, the investigation by Fuhlbrügge et al (2013) revealed high atmospheric mixing ratios of CH 3 I, CHBr 3 and CH 2 Br 2 close to the coast also in air masses transported from the open ocean, with a significant anticorrelation between the atmospheric mixing ratios and the height of MABL. We therefore examine how oceanic emissions contribute to the mixing ratios of atmospheric halocarbons taking the height of the marine atmospheric boundary layer (MABL) into account.…”

mentioning

confidence: 72%

“…Samples for dissolved halocarbons in sea water, atmospheric halocarbons and phytoplankton pigments were taken at all 24h-stations in parallel, and additionally four radio sonde launches per 24h-station were accomplished to determine the MABL properties. More details on the campaign and the meteorological conditions can be found in Bange et al (2011) and Fuhlbrügge et al (2013).…”

Section: Methodsmentioning

confidence: 99%

“…Atmospheric halocarbon mixing ratios and meteorological conditions were also determined during a second cruise leg P399/3 from Las Palmas, Spain to Vigo, Spain and are covered in Fuhlbrügge et al (2013). In contrast, this manuscript…”

Section: Methodsmentioning

confidence: 99%

“…Wind speed had the lowest mean of the whole cruise at S1 with 4.6 m s −1 and was highest at S2 with a mean of 11.0 m s −1 . The MABL height in this region determined by Fuhlbrügge et al (2013) ranged between 400 and 1100 m (Table 1). With decreasing distance to the Mauritanian coast, a decrease in SST and salinity and an increase in Chl a concentrations were observed.…”

Section: Hydrography and Environmental Parameters During Drivementioning

confidence: 99%

“…We therefore examine how oceanic emissions contribute to the mixing ratios of atmospheric halocarbons taking the height of the marine atmospheric boundary layer (MABL) into account. Meteorological constraints on the atmospheric distributions during the cruise are investigated in the accompanying paper by Fuhlbrügge et al (2013).…”

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confidence: 99%

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Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic

et al. 2014

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Abstract. Methyl iodide (CH 3 I), bromoform (CHBr 3 ) and dibromomethane (CH 2 Br 2 ), which are produced naturally in the oceans, take part in ozone chemistry both in the troposphere and the stratosphere. The significance of oceanic upwelling regions for emissions of these trace gases in the global context is still uncertain although they have been identified as important source regions. To better quantify the role of upwelling areas in current and future climate, this paper analyzes major factors that influenced halocarbon emissions from the tropical North East Atlantic including the Mauritanian upwelling during the DRIVE expedition. Diel and regional variability of oceanic and atmospheric CH 3 I, CHBr 3 and CH 2 Br 2 was determined along with biological and physical parameters at six 24 h-stations. Low oceanic concentrations of CH 3 I from 0.1-5.4 pmol L −1 were equally distributed throughout the investigation area. CHBr 3 and CH 2 Br 2 from 1.0 to 42.4 pmol L −1 and to 9.4 pmol L −1 , respectively were measured with maximum concentrations close to the Mauritanian coast. Atmospheric CH 3 I, CHBr 3 , and CH 2 Br 2 of up to 3.3, 8.9, and 3.1 ppt, respectively were detected above the upwelling, as well as up to 1.8, 12.8, and 2.2 ppt at the Cape Verdean coast. While diel variability in CH 3 I emissions could be mainly ascribed to oceanic nonbiological production, no main driver was identified for its emissions over the entire study region. In contrast, biological parameters showed the greatest influence on the regional distribution of sea-to-air fluxes of bromocarbons. The diel impact of wind speed on bromocarbon emissions increased with decreasing distance to the coast. The height of the marine atmospheric boundary layer (MABL) influenced halocarbon emissions via its influence on atmospheric mixing ratios. Oceanic and atmospheric halocarbons correlated well in the study region, and in combination with high oceanic CH 3 I, CHBr 3 and CH 2 Br 2 concentrations, local hot spots of atmospheric halocarbons could solely be explained by marine sources. This conclusion is in contrast to previous studies that hypothesized elevated atmospheric halocarbons above the eastern tropical Atlantic to be mainly originated from the West-African continent.

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confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Hydrography and Environmental Parameters During Drivementioning

confidence: 99%

mentioning

confidence: 99%

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Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic

et al. 2014

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Surface ocean-lower atmosphere study: Scientific synthesis and contribution to Earth system science

et al. 2015

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The domain of the surface ocean and lower atmosphere is a complex, highly dynamic component of the Earth system. Better understanding of the physics and biogeochemistry of the air-sea interface and the processes that control the exchange of mass and energy across that boundary define the scope of the Surface Ocean-Lower Atmosphere Study (SOLAS) project. The scientific questions driving SOLAS research, as laid out in the SOLAS Science Plan and Implementation Strategy for the period 2004-2014, are highly challenging, inherently multidisciplinary and broad. During that decade, SOLAS has significantly advanced our knowledge. Discoveries related to the physics of exchange, global trace gas budgets and atmospheric chemistry, the CLAW hypothesis (named after its authors, Charlson, Lovelock, Andreae and Warren), and the influence of nutrients and ocean productivity on important biogeochemical cycles, have substantially changed our views of how the Earth system works and revealed knowledge gaps in our understanding. As such SOLAS has been instrumental in contributing to the International Geosphere Biosphere Programme (IGBP) mission of identification and assessment of risks posed to society and ecosystems by major changes in the Earth́s biological, chemical and physical cycles and processes during the Anthropocene epoch. SOLAS is a bottom-up organization, whose scientific priorities evolve in response to scientific developments and community needs, which has led to the launch of a new 10-year phase. SOLAS (2015–2025) will focus on five core science themes that will provide a scientific basis for understanding and projecting future environmental change and for developing tools to inform societal decision-making

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Spatiotemporal distributions and oceanic emissions of short-lived halocarbons in the East China Sea

Yang

et al. 2023

Science of The Total Environment

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Impact of the marine atmospheric boundary layer conditions on VSLS abundances in the eastern tropical and subtropical North Atlantic Ocean

Cited by 33 publications

References 40 publications

Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic

Drivers of diel and regional variations of halocarbon emissions from the tropical North East Atlantic

Surface ocean-lower atmosphere study: Scientific synthesis and contribution to Earth system science

Spatiotemporal distributions and oceanic emissions of short-lived halocarbons in the East China Sea

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