A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
A Look at Amazon Basin Seasonal Dynamics with the Biophysical ... A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
Abstract submitted to the 2 nd LBA Scientific ConferenceEvidence for Changes in Amazon Basin Aerosol Composition During 20 thCentury Inferred From the Illimani Ice-Core, Eastern Bolivian AndesAlexandre Correia 1,2 (acorreia@if.usp.br); Rémi Freydier 3 ; Jefferson Simões 2,4 ; Jean-Denis Taupin 5 ;Robert Delmas 2 ; Paulo Artaxo 1 ; Bernard Dupré 3 .1 Institute of Physics, University of São Paulo, R Matão, Trav R, 187, São Paulo, SP 05508-900, Brazil;2 LGGE, CNRS and Université Joseph Fourier, Grenoble, France; 3 UMR5563, LMTG, CNRS andUniversité Paul Sabatier, Toulouse, France; 4 Institute of Geosciences, Federal University of Rio Grandedo Sul, Brazil; 5 LGGE, IRD, Grenoble, France.An 137m ice-core drilled in 1999 from Eastern Bolivian Andes at the summit of Nevado Illimani(16°37' S, 67°46' W, 6350m asl) opens a new perspective on tropical ice-core research as the site isstrongly influenced by Amazon Basin weather systems, offering the possibility of investigatingamazonian atmospheric chemistry changes along the 20 th century.The upper 50m of the ice-core were dated by multi-proxy analysis (δ 18 O, δ 2 H, 137 Cs, Ca +2content, electrical conductivity, and insoluble microparticle content), providing a record of environmentalvariations of about 80 years. Elemental concentrations for 46 chemical species (from Li to U) in 744 iceand snow samples along the 50m ice-core section were determined by Inductively Coupled Plasma-MassSpectrometry, providing a complex database with sub-annual-to-annual resolution.Lithium-rich salt lakes (salars) act as important local aerosol sources in the region. The average Liand Al concentrations are 0.312 and 252 ng g -1 , respectively. The measured Li/Al weight ratio is about 3times above the ratio for the mean world soil composition, evidencing the contribution of regional sourcesto the ice-core glaciochemistry. Analyses of austral summer and winter elemental concentrations showdifferent trends for the profiles of several elements, thus indicating changes in atmospheric chemistry.After 1960-1970 the concentration of P during summer and Zn during winter show a growing trend,which may be due to increasing biomass burning activity in Amazon Basin.
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Abstract submitted to <strong>the</strong> 2 nd LBA Scientific ConferenceEvidence for Changes in <strong>Amazon</strong> <strong>Basin</strong> Aerosol Composition During 20 thCentury Inferred From <strong>the</strong> Illimani Ice-Core, Eastern Bolivian AndesAlexandre Correia 1,2 (acorreia@if.usp.br); Rémi Freydier 3 ; Jefferson Simões 2,4 ; Jean-Denis Taupin 5 ;Robert Delmas 2 ; Paulo Artaxo 1 ; Bernard Dupré 3 .1 Institute of Physics, University of São Paulo, R M<strong>at</strong>ão, Trav R, 187, São Paulo, SP 05508-900, Brazil;2 LGGE, CNRS and Université Joseph Fourier, Grenoble, France; 3 UMR5563, LMTG, CNRS andUniversité Paul Sab<strong>at</strong>ier, Toulouse, France; 4 Institute of Geosciences, Federal University of Rio Grandedo Sul, Brazil; 5 LGGE, IRD, Grenoble, France.An 137m ice-core drilled in 1999 from Eastern Bolivian Andes <strong>at</strong> <strong>the</strong> summit of Nevado Illimani(16°37' S, 67°46' W, 6350m asl) opens a new perspective on tropical ice-core research as <strong>the</strong> site isstrongly influenced by <strong>Amazon</strong> <strong>Basin</strong> we<strong>at</strong>her systems, offering <strong>the</strong> possibility of investig<strong>at</strong>ingamazonian <strong>at</strong>mospheric chemistry changes along <strong>the</strong> 20 th century.The upper 50m of <strong>the</strong> ice-core were d<strong>at</strong>ed by multi-proxy analysis (δ 18 O, δ 2 H, 137 Cs, Ca +2content, electrical conductivity, and insoluble microparticle content), providing a record of environmentalvari<strong>at</strong>ions of about 80 years. Elemental concentr<strong>at</strong>ions for 46 chemical species (from Li to U) in 744 iceand snow samples along <strong>the</strong> 50m ice-core section were determined by Inductively Coupled Plasma-MassSpectrometry, providing a complex d<strong>at</strong>abase <strong>with</strong> sub-annual-to-annual resolution.Lithium-rich salt lakes (salars) act as important local aerosol sources in <strong>the</strong> region. The average Liand Al concentr<strong>at</strong>ions are 0.312 and 252 ng g -1 , respectively. The measured Li/Al weight r<strong>at</strong>io is about 3times above <strong>the</strong> r<strong>at</strong>io for <strong>the</strong> mean world soil composition, evidencing <strong>the</strong> contribution of regional sourcesto <strong>the</strong> ice-core glaciochemistry. Analyses of austral summer and winter elemental concentr<strong>at</strong>ions showdifferent trends for <strong>the</strong> profiles of several elements, thus indic<strong>at</strong>ing changes in <strong>at</strong>mospheric chemistry.After 1960-1970 <strong>the</strong> concentr<strong>at</strong>ion of P during summer and Zn during winter show a growing trend,which may be due to increasing biomass burning activity in <strong>Amazon</strong> <strong>Basin</strong>.
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