【摘 要】
：
渤海、黄海是高产二甲基硫(Dimethyl Sulfide,DMS)的大陆架海区.该海区DMS的现场调查研究有助于准确评估海洋DMS释放量及其对全球气候变化的负反馈作用.目前,无论是基于模型还是直接测量法的通量估算均以表层海水或低层大气DMS浓度为基础,因此,先进的检测技术对其通量估算的准确度具有决定性作用.气相色谱法、质谱法、化学发光法以及卫星遥感技术是现在常用的观测技术,而本文则基于苯辅助光电离离子迁移谱技术进一步提出了一种可在海域现场观测海水中DMS的方法.通过结合动态气提-Nafion管在线除水进
【机 构】
：
天津科技大学 海洋与环境学院,天津 300457;天津科技大学 天津市海洋资源与化学重点实验室,天津 300457;天津科技大学 海洋与环境学院,天津 300457;天津海关动植物与食品检测中心,天津
论文部分内容阅读
渤海、黄海是高产二甲基硫(Dimethyl Sulfide,DMS)的大陆架海区.该海区DMS的现场调查研究有助于准确评估海洋DMS释放量及其对全球气候变化的负反馈作用.目前,无论是基于模型还是直接测量法的通量估算均以表层海水或低层大气DMS浓度为基础,因此,先进的检测技术对其通量估算的准确度具有决定性作用.气相色谱法、质谱法、化学发光法以及卫星遥感技术是现在常用的观测技术,而本文则基于苯辅助光电离离子迁移谱技术进一步提出了一种可在海域现场观测海水中DMS的方法.通过结合动态气提-Nafion管在线除水进样系统,消除环境水汽的干扰;在最优条件下,基于DMS两个产物离子峰,可以实现0.10～120 nmol/L之间DMS的定量分析,检测限低至0.065 nmol/L;然后将所建方法应用于2019年秋季渤海、北黄海海水中DMS的现场观测.结果表明,表层海水中DMS的浓度为0.080～0.96 nmol/L(平均值为(0.44±0.34)nmol/L),其海气通量为0.12～17.75μmol/(m2·d)(平均值为(3.23±4.02)μmol/(m2·d));通过结合实验室检测结果、环境因子和浮游植物群落结构讨论了海水样品低温储存条件下DMS的变化和影响因素,结果显示,营养盐成分及浮游植物群落结构是影响储存样品中DMS浓度显著增加的主要因素,进一步表明了现场观测方法的建立对海洋DMS释放量的准确评估具有重要意义.
其他文献
MXenes,a new family of two-dimensional(2D)materials,have received extensive in-terest due to their fascinating physicochemical properties,such as outstanding light-to-heat conversion efficiency.However,the photothermal conversion mechanism of MXenes is st
Coherent vibrational dynamics can be observed in atomically precise gold nanoclusters using femtosec-ond time-resolved pump-probe spectroscopy.It can not only reveal the coupling between electrons and vibrations,but also reflect the mechanical and elec-tr
We propose a method for calculating the non-radiative decay rates for polyatomic molecules in-cluding anharmonic ef-fects of the potential en-ergy surface(PES)in the Franck-Condon re-gion.The method com-bines the n-mode repre-sentation method to construct
Mixed halide perovskites(MHPs)are a class of semiconductor materials with great promise for many optoelectronic applica-tions due to their outstanding photophys-ical properties.Understanding and tailor-ing the photogenerated carrier dynamics is essential
The intermolecular interaction determines the photo-physical properties of the organic aggregates,which are critical to the performance of organic photo-voltaics.Here,excitonic coupling,an important inter-molecular interaction in organic aggregates,betwee
The generalized quantum master equation(GQME)pro-vides a general and exact approach for simulating the re-duced dynamics in open quantum systems where a quan-tum system is embedded in a quantum environment.Dy-namics of open quantum systems is important in
After binding to human serum albumin,biliru-bin could undergo photo-isomerization and photo-induced cyclization pro-cess.The latter process would result the forma-tion of a product,named as lumirubin.These photo induced behaviors are the fundamental of cl
LASP(large-scale atomistic simulation with neural network potential)software developed by our group since 2018 is a powerful platform(www.lasphub.com)for performing atomic simulation of complex materi-als.The software integrates the neural network(NN)pote
Owing to the unique structural,electronic,and physico-chemical properties,molybdenum clusters are expected to play an impor-tant role in future nanotechnolo-gies.However,their ground states are still under debate.In this study,the crystal structure analys
Consistency between density func-tional theory calculations and X-ray photoelectron spectroscopy measure-ments confirms our predications on the undercoordination-induced local bond relaxation and core level shift of alkali metal,which determine the surfac