scholarly journals Stable isotopes measurements reveal dual carbon pools contributing to organic matter enrichment in marine aerosol

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Darius Ceburnis ◽  
Agne Masalaite ◽  
Jurgita Ovadnevaite ◽  
Andrius Garbaras ◽  
Vidmantas Remeikis ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Organic Matter ◽  
Carbon Pools ◽  
Marine Aerosol

Incorporation of Cochlodinium bloom-derived organic matter into a temperate subtidal macrobenthic food web as traced by stable isotopes

2020 ◽  
Vol 154 ◽  
pp. 111053 ◽  
Author(s):  
Hyun Je Park ◽  
Jung Hyun Kwak ◽  
Hee Yoon Kang ◽  
Kee-Young Kwon ◽  
Weolae Lim ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Organic Matter ◽  
Food Web

scholarly journals Source tracing of natural organic matter bound mercury in boreal forest runoff with mercury stable isotopes

2017 ◽  
Vol 19 (10) ◽  
pp. 1235-1248 ◽  
Author(s):  
Martin Jiskra ◽  
Jan G. Wiederhold ◽  
Ulf Skyllberg ◽  
Rose-Marie Kronberg ◽  
Ruben Kretzschmar
Keyword(s):  
Stable Isotopes ◽  
Organic Matter ◽  
Boreal Forest ◽  
Natural Organic Matter ◽  
Aquatic Ecosystems ◽  
Terrestrial Runoff ◽  
Source Tracing ◽  
Mercury Stable Isotopes

Terrestrial runoff represents a major source of mercury (Hg) to aquatic ecosystems.

scholarly journals Marine organic matter in the remote environment of the Cape Verde islands – an introduction and overview to the MarParCloud campaign

2020 ◽  
Vol 20 (11) ◽  
pp. 6921-6951 ◽  
Author(s):  
Manuela van Pinxteren ◽  
Khanneh Wadinga Fomba ◽  
Nadja Triesch ◽  
Christian Stolle ◽  
Oliver Wurl ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Organic Matter ◽  
Organic Compounds ◽  
Particle Number ◽  
Aerosol Particles ◽  
Cloud Water ◽  
Cape Verde ◽  
Marine Aerosol ◽  
Biological Production ◽  
Marine Organic Matter

Abstract. The project MarParCloud (Marine biological production, organic aerosol Particles and marine Clouds: a process chain) aims to improve our understanding of the genesis, modification and impact of marine organic matter (OM) from its biological production, to its export to marine aerosol particles and, finally, to its ability to act as ice-nucleating particles (INPs) and cloud condensation nuclei (CCN). A field campaign at the Cape Verde Atmospheric Observatory (CVAO) in the tropics in September–October 2017 formed the core of this project that was jointly performed with the project MARSU (MARine atmospheric Science Unravelled). A suite of chemical, physical, biological and meteorological techniques was applied, and comprehensive measurements of bulk water, the sea surface microlayer (SML), cloud water and ambient aerosol particles collected at a ground-based and a mountain station took place. Key variables comprised the chemical characterization of the atmospherically relevant OM components in the ocean and the atmosphere as well as measurements of INPs and CCN. Moreover, bacterial cell counts, mercury species and trace gases were analyzed. To interpret the results, the measurements were accompanied by various auxiliary parameters such as air mass back-trajectory analysis, vertical atmospheric profile analysis, cloud observations and pigment measurements in seawater. Additional modeling studies supported the experimental analysis. During the campaign, the CVAO exhibited marine air masses with low and partly moderate dust influences. The marine boundary layer was well mixed as indicated by an almost uniform particle number size distribution within the boundary layer. Lipid biomarkers were present in the aerosol particles in typical concentrations of marine background conditions. Accumulation- and coarse-mode particles served as CCN and were efficiently transferred to the cloud water. The ascent of ocean-derived compounds, such as sea salt and sugar-like compounds, to the cloud level, as derived from chemical analysis and atmospheric transfer modeling results, denotes an influence of marine emissions on cloud formation. Organic nitrogen compounds (free amino acids) were enriched by several orders of magnitude in submicron aerosol particles and in cloud water compared to seawater. However, INP measurements also indicated a significant contribution of other non-marine sources to the local INP concentration, as (biologically active) INPs were mainly present in supermicron aerosol particles that are not suggested to undergo strong enrichment during ocean–atmosphere transfer. In addition, the number of CCN at the supersaturation of 0.30 % was about 2.5 times higher during dust periods compared to marine periods. Lipids, sugar-like compounds, UV-absorbing (UV: ultraviolet) humic-like substances and low-molecular-weight neutral components were important organic compounds in the seawater, and highly surface-active lipids were enriched within the SML. The selective enrichment of specific organic compounds in the SML needs to be studied in further detail and implemented in an OM source function for emission modeling to better understand transfer patterns, the mechanisms of marine OM transformation in the atmosphere and the role of additional sources. In summary, when looking at particulate mass, we see oceanic compounds transferred to the atmospheric aerosol and to the cloud level, while from a perspective of particle number concentrations, sea spray aerosol (i.e., primary marine aerosol) contributions to both CCN and INPs are rather limited.

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