Dimethyl sulfide in the Amazon rain forest:DMS in the Amazon

Jardine, K. and Yañez-serrano, A. M. and Williams, J. and Kunert, N. and Jardine, A. and Taylor, T. and Abrell, L. and Artaxo, P. and Guenther, A. and Hewitt, C. N. and House, E. and Florentino, A. P. and Manzi, A. and Higuchi, N. and Kesselmeier, J. and Behrendt, T. and Veres, P. R. and Derstroff, B. and Fuentes, J. D. and Martin, S. T. and Andreae, M. O. (2015) Dimethyl sulfide in the Amazon rain forest:DMS in the Amazon. Global Biogeochemical Cycles, 29 (1). pp. 19-32. ISSN 0886-6236

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Surface-to-atmosphere emissions of dimethyl sulfide (DMS) may impact global climate through the formation of gaseous sulfuric acid, which can yield secondary sulfate aerosols and contribute to new particle formation. While oceans are generally considered the dominant sources of DMS, a shortage of ecosystem observations prevents an accurate analysis of terrestrial DMS sources. Using mass spectrometry, we quantified ambient DMS mixing ratios within and above a primary rainforest ecosystem in the central Amazon Basin in real-time (2010–2011) and at high vertical resolution (2013–2014). Elevated but highly variable DMS mixing ratios were observed within the canopy, showing clear evidence of a net ecosystem source to the atmosphere during both day and night in both the dry and wet seasons. Periods of high DMS mixing ratios lasting up to 8 h (up to 160 parts per trillion (ppt)) often occurred within the canopy and near the surface during many evenings and nights. Daytime gradients showed mixing ratios (up to 80 ppt) peaking near the top of the canopy as well as near the ground following a rain event. The spatial and temporal distribution of DMS suggests that ambient levels and their potential climatic impacts are dominated by local soil and plant emissions. A soil source was confirmed by measurements of DMS emission fluxes from Amazon soils as a function of temperature and soil moisture. Furthermore, light- and temperature-dependent DMS emissions were measured from seven tropical tree species. Our study has important implications for understanding terrestrial DMS sources and their role in coupled land-atmosphere climate feedbacks.

Item Type:
Journal Article
Journal or Publication Title:
Global Biogeochemical Cycles
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Date of Acceptance: 04/12/2014
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Deposited On:
09 Apr 2015 08:47
Last Modified:
18 Sep 2023 00:51