期刊
BRAZILIAN JOURNAL OF OCEANOGRAPHY
卷 66, 期 1, 页码 115-130出版社
INST OCEANOGRAFICO, UNIV SAO PAULO
DOI: 10.1590/S1679-87592018149406601
关键词
Anthropogenic pollution; Ocean acidification; Eutrophication; Extreme event
资金
- National Counsel of Technological and Scientific Development (CNPq) (MCT/CNPq/CT-Hidro/CT-Infra) [38/2009]
- Foundation for Science and Technology Support of Pernambuco [FACEPE/FAPESP-APQ-0074-1.08/11]
- Research Support Foundation of the State of Sao Paulo [FAPESP/FACEPE/ANR 2011/50582-0]
- Coordination for the Improvement of Higher Education Personnel (CAPES)
The susceptibility of coastal environments to shifts in the biogeochemical cycles of carbon and nutrients driven by anthropogenic pressure and climate change is a real challenge for the scientific community. This paper evaluated the effects of an extreme rainfall event over the nutrients and carbonate parameters in two polluted tropical estuaries. Surface water samples were taken seasonally along a salinity gradient in the Capibaribe and Barra de Jangadas estuaries m order to investigate the spatial and seasonal variability of dissolved nutrients, chlorophyll-a, dissolved oxygen, total alkalinity, inorganic carbon, partial pressure of C0(2) (pC0(2)) and C0(2) fluxes. The increased riverine influence caused by the fluvial flooding during the extremely rainy season augmented the nitrogen concentrations in the plumes, which also presented reduced salinity, alkalinity and dissolved oxygen values In the Capibaribe plume it has also shifted the mean C0(2) flux value of - 4.01 mmolC m(-2) d(-1) during the dry season, to a positive mean flux of + 5.7 mmolC m(-2) d(-1) during the rainy season. Within the estuaries the BOD5,20 and dissolved phosphorus values were higher during the dry season (p<0.0001), they showed positive correlation with the phytoplanktonic blooms that reached a chl-a value of 85 mg m(-3) in the Capibaribe. The high alkalinity found in both estuaries, with mean values between dry and wet seasons respectively from 1808 to 1373 mu mol kg-1 in the Capibanbe estuary and 1616 to 1058 mu mol kg-1 in Barra de Jangadas estuary, may act as a buffer to the process of coastal acidification due to eutrophication. The increased rivers discharge lead to a greater transport of organic matter and nutrients to the coast, decreasing the oxygen availability and shifting the metabolic status of the estuarine plume to heterotrophic, whereas increased the water quality within the estuaries due the flushing promoted by the extreme rainfall event.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据