Cited by 75Marine and coastal ecosystemsAtmospheric chemistry and aerosolsAtmospheric and Environmental Gas Dynamics

Production mechanism of C2‐C4 hydrocarbons in seawater: Field measurements and experiments

Ratte, M., Plass‐Dülmer, C., Koppmann, R., Rudolph, J., Denga, J.·1993·Global Biogeochemical Cycles

Abstract

The production mechanism of light nonmethane hydrocarbons (NMHC) in seawater was investigated during the North Atlantic atmospheric chemistry program (NATAC) in April and May 1991 in the European coastal seas and the North Atlantic. A significant alkene production occurred in the presence of light only. Under conditions of negligible NMHC emissions (low wind velocity) increasing hydrocarbon concentrations were observed during daytime, whereas the concentrations remained constant during night. NMHC formation experiments were carried out with seawater filled in quartz glass bottles and showed the same dependence of light. Experiments with differently pretreated seawater samples indicated that the presence of dissolved organic material (DOM) is also necessary for alkene production. We suggest a two‐step production mechanism for alkenes: first DOM is released, probably from algae, then part of this material is photochemically transformed into alkenes. The production rates in the quartz glass bottles were comparable to the production rates in the ocean surface. This indicates that the processes occurring in the experimental setups represent the processes occurring in the field. Since the production ‐ and emission rates were in the same range it can be concluded that the budget of light alkenes in the remote marine environment is determined by the production in seawater as the dominant source and the flux into the atmosphere as the main loss process.

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Crossref · 10.1029/93gb00054

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Authors
Ratte, M., Plass‐Dülmer, C., Koppmann, R., Rudolph, J., & Denga, J.
Venue
Global Biogeochemical Cycles
Published
1993-06
Volume
7
Issue
2
Pages
369-378
ISSN
  • 0886-6236 (ISSN-L)
  • 1944-9224
OpenAlex
W2044722618
Cited by
75
References
28
Citations by year
2026: 2 · 2025: 2 · 2024: 9 · 2023: 1 · 2021: 2 · 2020: 5 · 2019: 5 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 2 · 2013: 2
FWCI
1.91
Type
journal article
Language
en
Open access
closed
Locations
Global Biogeochemical Cycles (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
  • Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric and Environmental Gas Dynamics
Keywords
alkenes, seawater, photochemical production, dissolved organic matter, diurnal variation, atmospheric fluxes, North Atlantic

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