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Soil organic carbon dust emission: an omitted global source of atmospheric CO2

Global change biology, 2013-10, Vol.19 (10), p.3238-3244 [Peer Reviewed Journal]

2013 John Wiley & Sons Ltd ;2014 INIST-CNRS ;2013 John Wiley & Sons Ltd. ;ISSN: 1354-1013 ;EISSN: 1365-2486 ;DOI: 10.1111/gcb.12305 ;PMID: 23897802

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Title:
Soil organic carbon dust emission: an omitted global source of atmospheric CO2
Author: Chappell, Adrian ; Webb, Nicholas P. ; Butler, Harry J. ; Strong, Craig L. ; McTainsh, Grant H. ; Leys, John F. ; Viscarra Rossel, Raphael A.
Subjects: Animal and plant ecology ; Animal, plant and microbial ecology ; Australia ; Biological and medical sciences ; Carbon ; Carbon - analysis ; carbon accounting ; carbon budgets ; Carbon dioxide ; Carbon Dioxide - analysis ; Climate change ; Dust - analysis ; dust emission ; Emissions ; Fundamental and applied biological sciences. Psychology ; General aspects ; Models, Theoretical ; Soil - chemistry ; Soil erosion ; soil organic carbon ; Spatio-Temporal Analysis ; Terrestrial ecosystems ; Wind
Is Part Of: Global change biology, 2013-10, Vol.19 (10), p.3238-3244
Description: Soil erosion redistributes soil organic carbon (SOC) within terrestrial ecosystems, to the atmosphere and oceans. Dust export is an essential component of the carbon (C) and carbon dioxide (CO2) budget because wind erosion contributes to the C cycle by removing selectively SOC from vast areas and transporting C dust quickly offshore; augmenting the net loss of C from terrestrial systems. However, the contribution of wind erosion to rates of C release and sequestration is poorly understood. Here, we describe how SOC dust emission is omitted from national C accounting, is an underestimated source of CO2 and may accelerate SOC decomposition. Similarly, long dust residence times in the unshielded atmospheric environment may considerably increase CO2 emission. We developed a first approximation to SOC enrichment for a well‐established dust emission model and quantified SOC dust emission for Australia (5.83 Tg CO2‐e yr−1) and Australian agricultural soils (0.4 Tg CO2‐e yr−1). These amount to underestimates for CO2 emissions of ≈10% from combined C pools in Australia (year = 2000), ≈5% from Australian Rangelands and ≈3% of Australian Agricultural Soils by Kyoto Accounting. Northern hemisphere countries with greater dust emission than Australia are also likely to have much larger SOC dust emission. Therefore, omission of SOC dust emission likely represents a considerable underestimate from those nations’ C accounts. We suggest that the omission of SOC dust emission from C cycling and C accounting is a significant global source of uncertainty. Tracing the fate of wind‐eroded SOC in the dust cycle is therefore essential to quantify the release of CO2 from SOC dust to the atmosphere and the contribution of SOC deposition to downwind C sinks.
Publisher: Oxford: Blackwell Publishing Ltd
Language: English
Identifier: ISSN: 1354-1013
EISSN: 1365-2486
DOI: 10.1111/gcb.12305
PMID: 23897802
Source: MEDLINE
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Soil organic carbon dust emission: an omitted global source of atmospheric CO2

2013 John Wiley & Sons Ltd ;2014 INIST-CNRS ;2013 John Wiley & Sons Ltd. ;ISSN: 1354-1013 ;EISSN: 1365-2486 ;DOI: 10.1111/gcb.12305 ;PMID: 23897802

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