5 documents found, page 1 of 1
Dimethyl sulfide in the Amazon rain forest
Jardine, Kolby J.; Yáñez-Serrano, Ana Maria; Williams, Jonathan C.; Kunert, Norbert; Jardine, Angela B.; Taylor, Tyeen C.; Abrell, Leif; Artaxo, PauloSurface-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 quantif...
Highly reactive light-dependent monoterpenes in the Amazon
Jardine, Angela B.; Jardine, Kolby J.; Fuentes, José D.; Martin, Scot T.; Martins, Giordane Augusto; Durgante, Flávia MachadoDespite orders of magnitude difference in atmospheric reactivity and great diversity in biological functioning, little is known about monoterpene speciation in tropical forests. Here we report vertically resolved ambient air mixing ratios for 12 monoterpenes in a central Amazon rainforest including observations of the highly reactive cis-β-ocimene (160 ppt), trans-β-ocimene (79 ppt), and terpinolene (32 ppt) wh...
Seasonality of isoprenoid emissions from a primary rainforest in central Amazonia
Alves, Eliane Gomes; Jardine, Kolby J.; Tóta, Júlio; Jardine, Angela B.; Yáñez-Serrano, Ana Maria; Karl, Thomas G.; Tavares, Julia ValentimTropical rainforests are an important source of isoprenoid and other volatile organic compound (VOC) emissions to the atmosphere. The seasonal variation of these compounds is however still poorly understood. In this study, vertical profiles of mixing ratios of isoprene, total monoterpenes and total sesquiterpenes, were measured within and above the canopy, in a primary rainforest in central Amazonia, using a pr...
Methanol and isoprene emissions from the fast growing tropical pioneer species ...
Jardine, Kolby J.; Jardine, Angela B.; Souza, Vinicius F.; Carneiro, Vilany Matilla Colares; Ceron, João Vitor Barbosa; Gimenez, Bruno OlivaIsoprene (Is) emissions by plants represent a loss of carbon and energy resources leading to the initial hypothesis that fast growing pioneer species in secondary tropical forests allocate carbon primarily to growth at the expense of isoprenoid defenses. In this study, we quantified leaf isoprene and methanol emissions from the abundant pantropical pioneer tree species Vismia guianensis and ambient isoprene con...
Green leaf volatile emissions during high temperature and drought stress in a c...
Jardine, Kolby J.; Chambers, Jeffrey Quintin; Holm, Jennifer A.; Jardine, Angela B.; Fontes, Clarissa Gouveia; Zorzanelli, Raquel F.Prolonged drought stress combined with high leaf temperatures can induce programmed leaf senescence involving lipid peroxidation, and the loss of net carbon assimilation during early stages of tree mortality. Periodic droughts are known to induce widespread tree mortality in the Amazon rainforest, but little is known about the role of lipid peroxidation during drought-induced leaf senescence. In this study, we ...