标签归档：钟广财

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Postdoctorate

Drs Zhong Guangcai and Chen Duohong completed their postdoctorate study in GIG

December 1st,2015

Drs Zhong Guangcai （钟广财） and Chen Duohong （陈多宏） reported to the assessment panel on their postdoctorate work  in GIG, on December 1st. By this they officially completed their PDRA. Congratulations! Assessment panel members were Professors Zou Shichun (Chairman, Sun Yat-sen University), Yu Zhiqiang, Peng Xianzhi, Bi Xinhui and Luo Chunling.

Guangcai’s new posiiton in GIG will be Research Associate. While Dr Chen Duohong has just been promoted to Senior Engeneerer (professor-eqilvalent band，教授级高工) in Guangdong Environmental Monitoring Centre (GDEMC).

c1Dr Zhong Guangcai was showing his postdoctor work.

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Dr Chen Duohong (陈多宏）answered the assessment team questions happily.

研究方向

碳十四 (Radiocarbon)

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环境14C技术与应用

主要研究人员：张干，朱三元，成志能，钟广财，李军，刘俊文，张向云，姜懿珊，莫扬之，苏涛，孙悦，徐步青

地球上的放射性碳同位素（14C）主要有两个来源，一是宇宙射线下由14N同位素在大气中生成（图1），二是以1960-1970年代为高峰的人类核试验产生的14C在大气中的衰变遗存。二者相互叠加，构成现时大气14C的背景丰度（“现代碳”，Contemporary carbon）。由于核爆高峰期渐行渐远，大气“现代碳”的14C丰度正处于持续衰减中（图2）。

14C具有5730年的半衰期，衰变产物为14N（图1）。因此，源于石油、煤等化石燃料（经上亿年衰变）燃烧的C将不具有放射性（“死碳”）；而源于生物质排放及燃烧的碳，将具有与同期大气相近的“现代碳”14C同位素丰度（图2）。故而，利用14C技术，可有效判识“死碳”和“现代碳”对有机质的相对贡献比例，提供其来源信息。

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图1 天然14C的生成和环境命运 (Libby, 1949, Science。Libby因14C工作获Nobel奖)

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图2 不同地表植被（当年生、10年生)、微生物和土壤有机质（SOM）14C丰度的时间变化（Trumbore, 2009, Annu. Rev. Earth Planet. Sci.）

依托有机地球化学国家重点实验室的14C专用加速器质谱（AMS），研究组致力于建立较为完善的AMS-14C分析前处理方法和装置，并将其应用于大气气溶胶、沉积碳埋藏、土壤碳动态等研究领域。目前已建立的技术系统如：

（1）基于热化学原理的两阶段加热气溶胶OC/EC分离-捕集系统（图3，Zhang Yanlin et al., NIMB, 2010; Liu Di et al., 2013, ES&T），经石墨化制靶，以固体源AMS测定14C丰度；

（2）基于OC/EC商用分析仪（Sunrise TOT）的微量样品OC/EC分离制备系统（图4，参考Zhang Yanlin et al., 2012, ACP），用于对气溶胶中的有机质进行分离，并作为CO2收集，以气体源AMS测定14C丰度；

（3）基于催化加氢技术（hydropyrolysis）的有机碳、黑碳（OC-BC）分离方法和装置（图5）。

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图3 基于热化学的两阶段气溶胶OC、EC分离制备系统。Zhang YL, 2010, NIMB; Liu D, 2013, ES&T.

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图4 基于商用OC/EC (TOT)分析仪改装的微量样本OC、EC分离制备与AMS气体源14C测定技术。参考Zhang YL 2012, ACP.

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图5 催化加氢装置。

在此研究方向，我们与瑞士Bern大学Sonka Szidat研究组、瑞典斯德尔摩大学Orjan Gustufsson研究组具合作关系和人员交流。

从2015年开始，受国家基金重点、面上项目和广州市有关项目的支持，相关的方法和技术正/将分别用于以下研究：（1）中南半岛生物质燃烧污染排放；（2）珠江三角洲/广州市灰霾的物质示踪和源解析；（3）河口/海岸带沉积碳埋藏与碳循环过程；（4）森林土壤碳动态。

目前，张向云正完善催化化加氢分离OC/BC的方法；姜懿珊正应用PLFA的单体14C信息，探讨森林土壤碳动态；莫扬之在探索以14C示踪气溶胶中棕碳（BrC）吸光组分的来源；苏涛探讨以14C对气溶胶PMF源解析结果进行制约；徐步青开始研发大气中多元酸（草酸等）的单体化合物分离与14C测定方法；孙悦正建立基于苯多酸（BPCA）的黑炭（BC）和水溶黑炭（DBC）的14C测定技术。

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Kick-off workshop for biomass burning project

The Kick-off workshop for the Indo-China Peninsula NSFC Key Project on biomass burning (20150122-23)

The key project on buomass burning and its environmental impact funded by NSFC was domestically kicked-off on the workshop held in GIGCAS on the 22nd-23rd of January. The project will last for 5 years, with an internaitonal team from Thailand, UK, Swiss and China. The domestic participants include members from Wuhan University, Institute of Geochemistry in Guiyang, Yantai Institute of Coastal Zone. The workshop aimed at shaping the major tasks and technical arrangements for the project, as well as its appropriate natual extension to maximize the project’s impact. The abstract of the project is as below.

【Emission and regional impact of organic pollutants from biomass burning in Indo-China Peninsula】 Regional biomass burning injects enormous amount of gasses and particles into the atmosphere. It is regarded as an important biogeochemical processes even at global scale, and poses significant impact on regional atmospheric environment. The Indo-China Peninsula (Thailand, Vietnam, Myanmar, Laos and Cambodia) is one of the typical regions where large scale biomass burning activities take place, characteristic of widespread burning area, concentrated burning season, and various burning types. The emission may affect the vast region of West Pacific including the southern China coastal length. The peninsula has been a research hotspot for biomass burning emission research. The proposed project aims at a comprehensive study on the emission of carbonaceous aerosols, polycyclic aromatic hydrocarbons (PAHs) and typical persistent organic pollutants (POPs) from biomass burning in the peninsula, by integrating open biomass burning experiments, regional passive air sampling, station-based active air sampling, inorganic and organic markers and numeric models etc. In particular, novel passive atmospheric samplers and unique technique for radiocarbon analysis of carbon species in aerosols, as well as compound-specific radiocarbon analysis of PAHs, will be employed to effectively apportion the biomass burning contribution to regional air pollution. The emission mechanisms, chemical compositions, spatial-temporal distribution and environmental impact of biomass burning emission from the Indo-China peninsula will be investigated; the pathways for long-range atmospheric transport of this biomass burning emission towards the southern China coastal region will be elucidated and its impact range and extent being assessed.

bb1A pre-gathering of a few group members. From left to right: Dr Tiao Chongguo (田崇国）, Prof Chen Yingjun（陈颖军）, Prof Luo Chunling（罗春玲）, Dr Cheng Hairong（成海容）, Dr Li Jun （李军）and Zhang Gan （张干）.

bb2Meeting in room 407