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

Surface-to-atmosphere emissions of dimethyl sulfide (DMS) may impact global climate 44 through the formation of gaseous sulfuric acid, which can yield secondary sulfate 45 aerosols and contribute to new particle formation. While oceans are generally 46 considered the dominant source of DMS, a shortage of ecosystem observations prevents 47 an accurate analysis of terrestrial DMS sources. Using mass spectrometry, we quantified 48 ambient DMS mixing ratios within and above a primary rainforest ecosystem in the 49 central Amazon Basin in real-time (2010-2011) and at high vertical resolution (2013-50 2014). Elevated but highly variable DMS mixing ratios were observed within the 51 canopy, showing clear evidence of a net ecosystem source to the atmosphere during 52 both day and night in both the dry and wet seasons. Periods of high DMS mixing ratios 53 lasting up to 8 hours (up to 160 ppt) often occurred within the canopy and near the 54 surface during many evenings and nights. Daytime gradients showed mixing ratios (up 55 to 80 ppt) peaking near the top of the canopy as well as near the ground following a rain 56 event. The spatial and temporal distribution of DMS suggests that ambient levels and 57 their potentialmore » climatic impacts are dominated by local soil and plant emissions. A soil 58 source was confirmed by measurements of DMS emission fluxes from Amazon soils as 59 a function of temperature and soil moisture. Furthermore, light and temperature 60 dependent DMS emissions were measured from seven tropical tree species. Our study 61 has important implications for understanding terrestrial DMS sources and their role in 62 coupled land-atmosphere climate feedbacks. 63« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [9] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [10] ;  [11] more »;  [3] « less
  1. Lawrence Berkeley National Laboratory, Berkeley, California (United States). Climate Science Department, Earth Science Division
  2. National Institute for Amazon Research, Manaus (Brazil)
  3. Max Planck Institute for Chemistry, Mainz (Germany). Atmospheric Chemistry and Biogeochemistry Departments
  4. Max Plank Institute for Biogeochemistry, Jena (Germany)
  5. University of Arizona, Tucson, Arizona (United States). Department of Ecology and Evolutionary Biology
  6. University of Arizona, Tucson, Arizona (United States). Departments of Chemistry and Biochemistry and Soil, Water and Environmental Science
  7. University of São Paulo, São Paulo (Brazil). Institute of Physics
  8. Pacific Northwest National Laboratory, Richland, Washington (United States)
  9. University of Lancaster, Lancaster (United Kingdom). Lancaster Environment Centre
  10. Pennsylvania State University, University Park, Pennsylvania (United States). Department of Meteorology, College of Earth and Mineral Sciences
  11. Harvard University, Cambridge, Massachusetts (United States). School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences
Publication Date:
Report Number(s):
PNNL-SA-107542
Journal ID: ISSN 0886-6236
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830; HALOPROC 763; 0730305; AC02C05CH11231
Type:
Published Article
Journal Name:
Global Biogeochemical Cycles
Additional Journal Information:
Journal Volume: 29; Journal Issue: 1; Journal ID: ISSN 0886-6236
Publisher:
American Geophysical Union (AGU)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; dimethyl sulfide, DMS; Biogeochemical cycles; process and modelling; Sulfur cycling; Biosphere/atmosphere; interactions; Land/atmosphere interactions; Clouds and aerosols).
OSTI Identifier:
1240465
Alternate Identifier(s):
OSTI ID: 1184921; OSTI ID: 1240466; OSTI ID: 1407324