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首页> 外文期刊>Polar biology >Vertical flux of particulate matter in an Arctic fjord: the case of lack of the sea-ice cover in Adventfjorden 2006-2007
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Vertical flux of particulate matter in an Arctic fjord: the case of lack of the sea-ice cover in Adventfjorden 2006-2007

机译：北极峡湾中颗粒物的垂直通量：2006-2007年Adventfjorden缺少海冰覆盖的情况

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摘要

Seasonal dynamics of suspended minerals, organic matter, particulate, and dissolved organic carbon (DOC), chlorophyll, and their vertical fluxes were studied in a small Arctic fjord (Adventfjorden, Spitsbergen) from November 2006 to October 2007. The fjord was usually covered with fast ice in winter, but remained open throughout the year since 2005. The open-water winter period caused increased wave action and resuspension of organic and mineral particles. The lack of sea-ice in spring accelerated the onset of the productive season. The earlier light signal also caused an earlier appearance of mesozooplanktonic organisms, accompanied by a significant increase of the DOC pool in the water. In the cold period (winter and spring) 47% of the annual organic matter settled on the sampling site, a lot coming from the spring diatom bloom in April. Summer melt (July, August) resulted in turbid and brackish fjord surface water with stratification and increase of both suspended particles and sedimentation, causing 60% of the annual minerals and 53% of the annual organic matter to settle at the sampling site. Increased dissolved organic carbon (DOC) through sloppy feeding on the mixo- and heterotrophic protista by the abundant mesozooplankton indicated intensive secondary production, resulting in arnmaximum fecal pellets flux of >5 mg C m~(-2) day~(-1). A warmer climate with reduced sea-ice cover in fjords will advance the onset of the spring bloom and will also result in a larger input of turbid melt water in summer, restricting the light availability and enhancing flocculation and thereby sedimentation.
机译：2006年11月至2007年10月，在一个小的北极峡湾（Adventfjorden，Spitsbergen）中研究了悬浮矿物质，有机物，颗粒和溶解的有机碳（DOC），叶绿素及其垂直通量的季节性变化。峡湾通常覆盖着冬季快速结冰，但自2005年以来一直保持全年开放。冬季的开阔水域引起波浪作用增加，有机和矿物颗粒重新悬浮。春季缺乏海冰加速了生产季节的开始。较早的光信号还引起中卵浮游生物的出现较早，同时水中的DOC池显着增加。在寒冷时期（冬季和春季），每年有47％的有机物沉淀在采样点上，其中很大一部分来自4月份的春季硅藻盛开。夏季融化（7月，8月）导致峡湾地表水浑浊和微咸，分层并增加了悬浮颗粒和沉淀，导致60％的年度矿物质和53％的年度有机物沉淀在采样点。大量中生浮游动物通过混养和异养原生生物的t养而增加的溶解有机碳（DOC）表示密集的二次生产，导致粪便颗粒最大通量> 5 mg C m〜（-2）天〜（-1）。峡湾海冰覆盖减少的温暖气候将提前春季开花，并在夏季导致大量混浊的融化水输入，限制了光的可利用性并增强了絮凝作用，从而导致沉积。

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  • 来源
    《Polar biology》 |2010年第2期|223-239|共17页
  • 作者

    Marek Zajaczkowski; Henrik Nygard; Else Nøst Hegseth; Jørgen Berge;

  • 作者单位

    Institute of Oceanology, Polish Academy of Sciences, 55 Powstancow Warszawy Street, Sopot 81-712, Poland;

    University Centre in Svalbard, P.O. Box 156, Longyearbyen 9171, Norway The Norwegian College of Fishery Science, University of Tromsø, Tromsø 9037, Norway;

    The Norwegian College of Fishery Science, University of Tromsø, Tromsø 9037, Norway;

    University Centre in Svalbard, P.O. Box 156, Longyearbyen 9171, Norway;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    primary production; secondary production; carbon flux; chlorophyll; fjord; arctic;

    机译：初级生产;二次生产;碳通量叶绿素峡湾北极;

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