國立中央大學大氣科學學系系友會

講　　題 ： Terrestrial black carbon Biogeochemistry using novel Spectroscopic techniques  

活動時間 ：2009/03/10  14:00 

地　　點 ：科一館   S-325 

講　　師 ：Dr. Biqing Liang 

講者單位：Department of Earth, Atmospheric and Planetary Sciences, MIT

英文演說 ：否 





摘要：

Black carbon (BC) plays an important role in the global C budget and biogeochemical cycling, due to its potential to act as a significant sink of atmospheric CO2. In order to fully evaluate the influence of BC on the global C cycle, an understanding of its chemical stability, physical stabilization and its impact on other C cycling is required. The biochemical stability of BC was assessed in a chronosequence of high-BC containing Anthrosols from the central Amazon, Brazil, using a range of spectroscopic and biological methods. The molecular composition of the core regions and surfaces of micrometer-sized BC particles was quantified by synchrotron-based near-edge X-ray fine structure (NEXAFS) spectroscopy coupled to Scanning Transmission X-ray Microscopy (STXM). Long term incubation experiment with isotopically different organic matter and sequential fractionation were done to investigate the mineralization of BC and its physical protection by minerals.