气候变化领域集成服务门户(CCPortal): Physico-chemical data including methane concentrations, as well as methane oxidation rates, measured at time-series station Boknis Eck (Baltic Sea) from 2012-2014

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.871890
	Physico-chemical data including methane concentrations, as well as methane oxidation rates, measured at time-series station Boknis Eck (Baltic Sea) from 2012-2014
	Steinle; Lea; Maltby; Johanna; Treude; Tina; Kock; Annette; Bange; Hermann Werner; Niemann; Helge
发布日期	2017-02-08
数据集类型	dataset
英文简介	Coastal seas may account for more than 75% of global oceanic methane emissions. There, methane is mainly produced microbially in anoxic sediments from where it can escape to the overlying water column. Aerobic methane oxidation (MOx) in the water column acts as a biological filter reducing the amount of methane that eventually evades to the atmosphere. The efficiency of the MOx filter is potentially controlled by the availability of dissolved methane and oxygen, as well as temperature, salinity, and hydrographic dynamics, and all of these factors undergo strong temporal fluctuations in coastal ecosystems. In order to elucidate the key environmental controls, specifically the effect of oxygen availability, on MOx in a seasonally stratified and hypoxic coastal marine setting, we conducted a 2-year time-series study with measurements of MOx and physico-chemical water column parameters in a coastal inlet in the southwestern Baltic Sea (Eckernförde Bay). We found that MOx rates generally increased toward the seafloor, but were not directly linked to methane concentrations. MOx exhibited a strong seasonal variability, with maximum rates (up to 11.6 nmol l-1 d-1) during summer stratification when oxygen concentrations were lowest and bottom-water temperatures were highest. Under these conditions, 70-95% of the sediment-released methane was oxidized, whereas only 40-60% were consumed during the mixed and oxygenated periods. Laboratory experiments with manipulated oxygen concentrations in the range of 0.2-220 µmol l-1 revealed a sub-micromolar oxygen-optimum for MOx at the study site. In contrast, the fraction of methane-carbon incorporation into the bacterial biomass (compared to the total amount of oxidised methane) was up to 38-fold higher at saturated oxygen concentrations, suggesting a different partitioning of catabolic and anabolic processes under oxygen-replete and oxygen-starved conditions, respectively. Our results underscore the importance of MOx in mitigating methane emission from coastal waters and indicate an organism-level adaptation of the water column methanotrophs to hypoxic conditions.
空间范围	Latitude: 54.529500 * Longitude: 10.039330
时间范围	2012-10-17T10:23:36 - 2014-09-17T10:01:40
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/216659
推荐引用方式 GB/T 7714	Steinle,Lea,Maltby,et al. Physico-chemical data including methane concentrations, as well as methane oxidation rates, measured at time-series station Boknis Eck (Baltic Sea) from 2012-2014.2017-02-08.https://doi.org/10.1594/PANGAEA.871890.