气候变化领域集成服务门户(CCPortal): Dynamics of halocarbons in coastal surface waters during short term mesocosm experiments

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.859673
	Dynamics of halocarbons in coastal surface waters during short term mesocosm experiments
	Orlikowska; Anna; Stolle; Christian; Pollehne; Falk; Jürgens; Klaus; Schulz-Bull; Detlef
发布日期	2015-05-12
数据集类型	dataset
英文简介	The aim of the present study was to evaluate the influence of different light quality, especially ultraviolet radiation (UVR), on the dynamics of volatile halogenated organic compounds (VHOCs) at the sea surface. Short term experiments were conducted with floating gas-tight mesocosms of different optical qualities. Six halocarbons (CH3I, CHCl3, CH2Br2, CH2ClI, CHBr3 and CH2I2), known to be produced by phytoplankton, together with a variety of biological and environmental variables were measured in the coastal southern Baltic Sea and in the Raunefjord (North Sea). These experiments showed that ambient levels of UVR have no significant influence on VHOC dynamics in the natural systems. We attribute it to the low radiation doses that phytoplankton cells receive in a normal turbulent surface mixed layer. The VHOC concentrations were influenced by their production and removal processes, but they were not correlated with biological or environmental parameters investigated. Diatoms were most likely the dominant biogenic source of VHOCs in the Baltic Sea experiment, whereas in the Raunefjord experiment macroalgae probably contributed strongly to the production of VHOCs. The variable stable carbon isotope signatures (d13C values) of bromoform (CHBr3) also indicate that different autotrophic organisms were responsible for CHBr3 production in the two coastal environments. In the Raunefjord, despite strong daily variations in CHBr3 concentration, the carbon isotopic ratio was fairly stable with a mean value of -26 per mil. During the declining spring phytoplankton bloom in the Baltic Sea, the d13C values of CHBr3 were enriched in 13C and showed noticeable diurnal changes (-12 per mil ± 4). These results show that isotope signature analysis is a useful tool to study both the origin and dynamics of VHOCs in natural systems.
空间范围	Median Latitude: 57.225000 * Median Longitude: 8.657915 * South-bound Latitude: 54.181110 * West-bound Longitude: 5.218890 * North-bound Latitude: 60.268890 * East-bound Longitude: 12.096940
时间范围	2011-03-21T15:30:00 - 2011-05-16T13:30:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215412
推荐引用方式 GB/T 7714	Orlikowska,Anna,Stolle,et al. Dynamics of halocarbons in coastal surface waters during short term mesocosm experiments.2015-05-12.https://doi.org/10.1594/PANGAEA.859673.