Marine Biogeochemistry

WG Halocarbons

The work of the Halocarbon group aims at the identification of the main driving factors for the regional and temporal variability of marine halocarbon distributions and emissions and their impact in the troposphere and stratosphere. The tropical oceans are of special significance, as most tropospheric trace gases, including the oceanic emissions of the short-lived halocarbons, enter the stratosphere in the tropics. They are transported towards the winter pole by large-scale circulation in the stratosphere, finally descending to the troposphere at mid and high latitudes again. Hence, tropical processes impact the chemical composition of the entire atmosphere. In the projects SOPRAN, TRANSBROM, SHIVA, ROMIC-THREAT, OASIS, and Astra- OMZ, oceanic halocarbon distributions, sources, their air-sea exchange, transport through the atmosphere and impact on the stratosphere are investigated. The interdisciplinary cooperation with atmospheric chemists and physicists, biologists and biogeochemical modelers, currently further investigates ” Threats to Ozone Recovery from Anthropogenic Emissions of ‘Very Short-lived’ Halocarbons” and the  “Biological control of climate-active trace gases in the surface ocean”. 

HalOcAt:   Halocarbons in the Ocean and Atmosphere (Global database project of shortlived - especially brominated and  iodinated halocarbons)
TransBrom:

Short lived bromine compounds in the ocean and their transport pathways into the stratosphere

SOPRAN
Sources and sinks of brominated and iodinated trace gases in the tropical Atlantic
Oceanic emissions and trace gas sources in the Mauritanian and equatorial Atlantic

HalOcAt
Halocarbons in the Ocean and Atmosphere (Global database project of shortlived- especially brominated and iodinated halocarbons)

TransBrom
Short lived bromine compounds in the ocean and their transport pathways into the stratosphere TransBrom

SHIVA
Stratospheric ozone: Halogen Impacts in a Varying Atmosphere SHIVA

SHIVA-SONNE
Oceanic emissions and trace gas sources in the South China and Sulu Sea
Pressemitteilung: Schädigt der Ozean die Ozonschicht?

THREAT
The role of oceanic halogen and sulfur compounds for the middle atmosphere in a changing climate

OASIS
Organic very short lived substances and their Air sea Exchange from the Indian Ocean to the Stratosphere