首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Molecular and bulk geochemical proxies in sediments from the Conwy Estuary, UK
【24h】

Molecular and bulk geochemical proxies in sediments from the Conwy Estuary, UK

机译:来自英国康迪河口沉积物中的分子和散装地球化学代理

获取原文
获取原文并翻译 | 示例
           

摘要

Owing to their restricted riverine flow and greater numbers, small estuaries (annual discharge < 2000 m(3) s(-1)) are important sites of organic carbon (OC) storage in sediments. The Conwy Estuary is an exemplar small rural-agricultural catchment which delivers a diverse pool of terrestrial OC to the Irish Sea. Thirty-nine surface sediments, covering a distance of 10.5 km, were taken transversal as well as longitudinal to the estuary to examine local and distant catchment inputs. Biomarkers (branched Glycerol Dialkyl Glycerol Tetraethers - brGDGTs, n-alkanes) and molecular and bulk proxies (BIT, P-aq, TAR, delta C-13, C/N), showed sediments were dominated by terrestrial inputs, with only sediments of the three most seaward sites showing stronger physical and geochemical characteristics of a marine influence (e.g., sandier sediments and lower BIT). Biomarker concentrations in the Conwy were comparable to the more urbanised Thames and the Clyde estuaries. The three estuaries showed similar fractional abundance of the brGDGTs, recording an inverse trend between the hexamethylated and the tetramethylated brGDGTs, and showing the pentamethylated brGDGTs as the dominant group. A systematic decrease in terrestrial biomarkers from bank to the main channel confirmed either a strong localised erosion/runoff process or a decrease in water velocity leading to a higher deposition. (C) 2020 British Geological Survey, a component body of UKRI 'BGS (c) UKRI 2020'. Published by Elsevier Ltd.
机译:None

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号