CO2 drawdown due to particle ballasting and iron addition by glacial aeolian dust: an estimate based on the ocean carbon cycle model MPIOM/HAMOCC version 1.6.2p3.

Heinemann, Malte, Segschneider, Joachim and Schneider, Birgit (Submitted) CO2 drawdown due to particle ballasting and iron addition by glacial aeolian dust: an estimate based on the ocean carbon cycle model MPIOM/HAMOCC version 1.6.2p3. Open Access Geoscientific Model Development Discussions . pp. 1-20. DOI 10.5194/gmd-2018-137.

Full text not available from this repository.

Supplementary data:

Abstract

Despite intense efforts, the mechanisms that drive glacial–interglacial changes in atmospheric pCO2are not fully
understood. Here, we aim at quantifying the potential contribution of aeolian dust deposition changes to the atmospheric pCO2
drawdown during the Last Glacial Maximum (LGM). To this end, we use the ocean circulation and carbon cycle model MPI-
OM/HAMOCC, including a new parameterisation of particle ballasting that accounts for the acceleration of sinking organic
soft tissue in the ocean by higher density biogenic calcite and opal particles, as well as mineral dust. Sensitivity experiments5
with reconstructed LGM dust deposition rates indicate that the acceleration of detritus by mineral dust likely played a small
role for atmospheric pCO2variations during glacial–interglacial cycles – on the order of 5 ppmv, compared to the reconstructed
∼80 ppmv-rise of atmospheric pCO2during the last deglaciation. The additional effect of the LGM dust deposition, namely
the enhanced fertilisation by the iron that is associated with the glacial dust, played a more important role – leading to a pCO2-
drawdown by more than 8 ppmv in our LGM sensitivity experiments despite an underestimated iron-limitation in the used10
model setup.

Document Type: Article
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/gmd-2018-137
ISSN: 1991-962X
Projects: Future Ocean, PalMod
Date Deposited: 06 Feb 2019 11:13
Last Modified: 14 Mar 2019 09:27
URI: http://oceanrep.geomar.de/id/eprint/45743

Actions (login required)

View Item View Item