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United States Department of Agriculture

Agricultural Research Service

Research Project: MANAGEMENT TECHNOLOGIES FOR CONSERVATION OF WESTERN RANGELANDS

Location: Range Management Research

Title: The role of carbon dust emission as a global source of atmospheric CO2

Authors
item Chappell, Adrian -
item Webb, Nicholas -
item Butler, Harry -
item Strong, Harry -
item Mctainsh, Grant -
item Leys, John -
item Viscarra Rossel, Raphael -

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: March 1, 2013
Publication Date: May 27, 2013
Citation: Chappell, A., Webb, N., Butler, H., Strong, H., Mctainsh, G., Leys, J., Viscarra Rossel, R. 2013. The role of carbon dust emission as a global source of atmospheric CO2 [abstract]. Soil Carbon Sequestration for Climate, Food Security and Ecosystem Services International Conference, May 27-29, 2013, Reykjavid, Iceland. p. 48.

Technical Abstract: 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 selectively removing4 SOC from vast areas and transports C dust quickly offshore; augmenting the net loss of carbon from terrestrial systems. However, the contribution of wind erosion to rates of carbon release and sequestration is poorly understood. Here we show that SOC dust emission is omitted from national carbon accounting, is an under-estimated source of CO2 and a largely unaccounted-for, likely accelerant of SOC decomposition. We developed a first approximation to SOC enrichment for a dust emission model and quantified SOC dust emission for Australia (5.83 Tg CO2-e y-1) and Australian agricultural soils (0.4 Tg CO2-e y-1). These amount to under-estimates for CO2 emissions of ~10% from combined C pools in Australia (yr=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 also likely represents a considerable underestimate from those nation’s carbon accounts.

Last Modified: 9/10/2014
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