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Titel |
Global CO2-consumption by chemical weathering: What is the contribution of highly active weathering regions? |
VerfasserIn |
Jens Hartmann, Nils Jansen, Hans H. Dürr, Stephan Kempe, Peter Köhler |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250037858
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Zusammenfassung |
CO2-consumption by chemical weathering of silicates and resulting silicate/carbonate
weathering ratios influences the terrestrial lateral inorganic carbon flux to the ocean and
long-term climate changes. However, little is known of the spatial extension of highly
active weathering regions and their proportion of global CO2-consumption. As
those regions may be of significant importance for global climate change, global
CO2-consumption is calculated here at high resolution, to adequately represent
them.
In previous studies global CO2-consumption is estimated using two different approaches:
i) a reverse approach based on hydrochemical fluxes from large rivers and ii) a forward
approach applying spatially explicit a function for CO2-consumption. The first
approach results in an estimate without providing a spatial resolution for highly active
regions and the second approach applied six lithological classes while including three
sediment classes (shale, sandstone and carbonate rock) based at a 1Ë or 2Ë grid
resolution. It remained uncertain, if the applied lithological classification schemes
represent adequately CO2-consumption from sediments on a global scale (as well as
liberation of other elements like phosphorus or silicon by chemical weatheirng).
This is due to the large variability of sediment properties, their diagenetic history
and the contribution from carbonates apparent in silicate dominated lithological
classes.
To address these issues, a CO2-consumption model, trained at high-resolution data, is
applied here to a global vector based lithological map with 15 lithological classes. The
calibration data were obtained from areas representing a wide range of weathering rates.
Resulting global CO2-consumption by chemical weathering is similar to earlier estimates
(237 Mt C a-1) but the proportion of silicate weathering is 63%, and thus larger than
previous estimates (49 to 60%). The application of the enhanced lithological classification
scheme reveals that it is important to distinguish among the various types of sedimentary
rocks and their diagenetic history to evaluate the spatial distribution of rock weathering and
thus lateral inorganic carbon fluxes. Results highlight the role of hotspots (>10 times global
average weathering rates) and hyperactive areas (5 to 10 times global average rates). Only 9%
of the global exorheic area is responsible for about 50% of CO2- consumption by
chemical weathering (or if hotspots and hyperactive areas are considered: 3.4%
of exorheic surface area corresponds to 28% of global CO2-consumption). The
contribution of endorheic areas to the global CO2-consumption is with 3.7 Mt C a-1 only
minor.
A significant impact on the global CO2-consumption rate can be expected if identified
highly active areas are affected by changes in the overall spatial patterns of the hydrological
cycle due to ongoing global climate change. Specifically if comparing the Last Glacial
Maximum with present conditions it is probable that also the global carbon cycle has been
affected by those changes. It is expected that results will contribute to improve global carbon
and global circulation models.
In addition, recognizing chemical weathering rates and geochemical composition of
certain lithological classes may be of value for studies focusing on biological aspects of the
carbon cycles (e.g. studies needing information on the abundance of phosphorus or silica in
the soil or aquatic system).
Reference:
Hartmann, J., Kempe, S, Dürr, H.H., Jansen, N. (2009) Global CO2-consumption by
chemical weathering: What is the contribution of highly active weathering regions?.
Global and Planetary Change, 69, 185-194. doi:10.1016/j.gloplacha.2009.07.007 |
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