表层海水异戊二烯船载走航连续观测方法的研究

The oceanic isoprene could widely join many kinds of atmospheric chemical and physical processes, and its oxides in atmosphere are significantly impacting the secondary organic aerosol. The surface seawater isoprene underway continuous measurement method is the indispensible basic and means to understand the processes. At present, the measurement method is still un-standard and un-proficient, obtaining abundant high-resolution data in field is very difficult, which quietly limit the study of oceanic isoprene. Therefore, it is significantly and requisite to build a standard, reliable and stable measurement method for implementing the studies of isoprene between the surface seawater and atmosphere. The purpose of this study is to build an automated and high efficiency purge and trap - separating detection system, which could be utilized to realize the surface seawater isoprene underway continuous measurements. We will use the electrical refrigeration technology, Single Chip software technology, data quality controlling technology to build a novel purge and trap system, which could overcome the conventional purge and trap device disadvantages, such as low-automated, low measuring efficiency and lacking of long-term continuous observation ability. The surface seawater isoprene continuous underway measurement method will be gradually built by using the purge and trap system. The results will improve the measuring efficiency of oceanic isoprene, and the method will be used in the ocean research expedition of our country, which will deepen and promote the oceanic isoprene studies and its knowledge in regulating the global climate.

海源异戊二烯广泛参与了海洋气溶胶的多种物理化学作用过程，其在大气中的氧化产物对海洋二次有机气溶胶的组成产生重要影响。表层海水异戊二烯走航连续观测方法是全面认识其作用过程的基础和必要手段。目前，国际上的相关技术尚不成熟，难以在现场获取大量准确的高分率数据，这制约了海洋异戊二烯的研究。建立规范、可靠、实用的观测方法，对开展海气界面异戊二烯的研究显得尤为迫切和重要。本项目拟建立一套自动、高效的吹扫捕集-分离检测系统，实现表层海水异戊二烯长期、稳定的走航连续观测。采用制冷片制冷、单片机控制、数据质量控制等技术搭建一套新型的吹扫捕集系统，弥补传统吹扫捕集方法自动化程度低、观测效率低及难以现场连续观测等缺陷，并逐步建立表层海水异戊二烯走航连续观测方法。研究成果将极大提升海洋异戊二烯的观测效率，应用于我国海洋科考中，促进和加深海洋异戊二烯研究及其在全球气候变化中作用的认识。

海洋来源的异戊二烯，因其对海洋边界层中气溶胶组成的重要影响及可能发挥的气候调节作用，受到国际前沿的关注。由于缺乏商品化的海水异戊二烯观测仪器，如何建立一套适用于现场观测的方法，以获取大量的高精度数据，成为开展海洋异戊二烯研究的重要前提。本项目通过研制吹扫捕集（PT）仪器，适配检测器后，创新一套表层海水异戊二烯船载走航连续观测装置。建立的方法，具有自动化、成本低、检测限低及具有长期观测能力等优点，易于在现场获取精确的高分辨率观测数据。研究成果将服务于我国大洋考察及极地考察，对促进我国深入开展海洋异戊二烯的研究具有重要意义。