气候变化领域集成服务门户(CCPortal): Water column nutrient, chlorophyll and dissolved organic carbon concentrations and dissolved organic matter characteristics in Roskilde Fjord, Denmark

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.895734
	Water column nutrient, chlorophyll and dissolved organic carbon concentrations and dissolved organic matter characteristics in Roskilde Fjord, Denmark
	Asmala; Eero; Haraguchi; Lumi; Markager; Stiig; Massicotte; Philippe; Riemann; Bo; Staehr; Peter A; Carstensen; Jacob
发布日期	2018-11-02
数据集类型	dataset
英文简介	Anthropogenic nutrient enrichment is changing the structure and the function of coastal ecosystems. These coastal zones are transitions between freshwater and marine systems where multiple biogeochemical processes remove, produce and transform organic matter. The extent to which the coastal zone is merely a conduit for terrestrial (allochthonous) organic matter, versus a distinct source of autochthonous organic matter fueled by eutrophication, is unclear. To address this issue, we characterized the freshwater and marine dissolved organic matter (DOM) pools in an eutrophic estuary with a long water residence time (Roskilde Fjord, Denmark) over an annual cycle. We combined elemental, optical (absorbance and fluorescence) and isotopic analyses to obtain insight about the bulk properties of the DOM pool during this period. We also used sediment traps to analyze the changes related to the exchange of organic matter between the particulate (POM) and dissolved (DOM) fractions. The results showed that labile autochthonous DOM from in situ primary production was rapidly transformed to more recalcitrant DOM that accumulated in the estuary despite continuous exchange with the open sea. Also, parts of the POM pool were degraded rapidly (within 24h) and transformed into the DOM pool. Accumulated DOM was characterized by relatively low molecular size and stable carbon isotopic value, and by high protein-like fluorescence. These results indicate that autotrophic material can be a major source of specific recalcitrant DOM in eutrophic coastal waters, contributing significantly to the flux of organic carbon to the ocean.
空间范围	Median Latitude: 55.813383 * Median Longitude: 12.019381 * South-bound Latitude: 55.650000 * West-bound Longitude: 11.887220 * North-bound Latitude: 55.937220 * East-bound Longitude: 12.120560
时间范围	2014-04-28T00:00:00 - 2015-11-25T00:00:00
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/216032
推荐引用方式 GB/T 7714	Asmala,Eero,Haraguchi,et al. Water column nutrient, chlorophyll and dissolved organic carbon concentrations and dissolved organic matter characteristics in Roskilde Fjord, Denmark.2018-11-02.https://doi.org/10.1594/PANGAEA.895734.