• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Hot-spots of primary productivity: An Alternative interpretation to Conventional upwelling models
【24h】

Hot-spots of primary productivity: An Alternative interpretation to Conventional upwelling models

机译：初级生产力的热点：传统上升模型的另一种解释

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The eastern Great Australian Bight (EGAB) forms part of the Southern and Indian Oceans and is an area of high ecological and economic importance. Although it supports a commercial fishery, quantitative estimates of the primary productivity underlying this industry are open to debate. Estimates range from <100 mg C m~(-2) day~(-1) to > 500 mg C m~(-2) day~(-1). Part of this variation may be due to the unique upwelling circulation of shelf waters in summer/autumn (November-April), which shares some similarities with highly productive eastern boundary current upwelling systems, but differs due to the influence of a northern boundary current, the Flinders current, and a wide continental shelf. This study examines spatial variations in primary productivity in the EGAB during the upwelling seasons of 2005 and 2006. Daily integral productivity calculated using the vertically generalised production model (VGPM) showed a high degree of spatial variation. Productivity was low (<800 mg C m~(-2) day~(-1)) in offshore central and western regions of the EGAB. High productivities (1600-3900 mg C m~(-2) day~(-1)) were restricted to hotspots in the east that were influenced by the upwelled water mass. There was a strong correlation between the depth of the euphotic zone and the depth of the mixed layer that suggested that ~ 50% of the euphotic zone lay below the mixed layer depth. As a result, high rates of primary productivity did not require upwelled water to reach the surface. A significant proportion of total productivity in the euphotic zone (57% in 2005 and 65% in 2006) occurred in the upwelled water mass below the surface mixed layer. This result has implications for daily integral productivities modelled with the VGPM, which uses surface measures of phytoplankton biomass to calculate productivity. Macro-nutrient concentrations could not be used to explain the difference in the low and high productivities (silica > 1 μmol L~(-1) nitrateitrite > 0.4 μmol L~(-1) phosphate > 0.1 μmol L~(-1)). Mixing patterns or micro-nutrient concentrations are possible explanations for spatial variations in primary productivity in the EGAB. On a global scale, daily rates of primary productivity of the EGAB lie between the highly productive eastern boundary current upwelling systems, and less productive coastal regions of western and south eastern Australia, and the oligotrophic ocean. However, daily productivity rates in the upwelling hotspots of the EGAB rival productivities in Benguela and Humboldt currents.
机译：东部大澳湾（EGAB）属于南部和印度洋的一部分，是具有高度生态和经济意义的地区。尽管它支持商业性渔业，但对该行业基础生产力的定量估计尚有争议。估计范围从<100 mg C m〜（-2）天〜（-1）到> 500 mg C m〜（-2）天〜（-1）。这种变化的部分原因可能是夏季/秋季（11月至4月）的架子水独特的上升流循环，它与高产的东部边界流上升流系统有一些相似之处，但由于北部边界流的影响而有所不同，弗林德斯河流以及广阔的大陆架。这项研究调查了2005年和2006年上升季节EGAB初级生产力的空间变化。使用垂直广义生产模型（VGPM）计算的每日整体生产率显示出高度的空间变化。 EGAB中部和西部近海地区的生产力较低（<800 mg C m〜（-2）天〜（-1））。高生产率（1600-3900 mg C m〜（-2）天〜（-1））仅限于东部受水流上升影响的热点。在共晶区的深度与混合层的深度之间存在很强的相关性，这表明共晶区的约50％位于混合层深度以下。结果，较高的初级生产率不需要向上涌出的水才能到达地表。在富营养区总生产力的很大一部分（2005年为57％，2006年为65％）发生在表面混合层以下的上升水体中。该结果对使用VGPM建模的每日整体生产率具有影响，该模型使用浮游植物生物量的表面度量来计算生产率。不能用大量营养物浓度来解释低生产率和高生产率的差异（二氧化硅> 1μmolL〜（-1）硝酸盐/亚硝酸盐> 0.4μmolL〜（-1）磷酸盐> 0.1μmolL〜（-1 ））。混合模式或微量营养素浓度可能是EGAB初级生产力空间变异的解释。在全球范围内，EGAB的初级生产力的每日速率介于高生产力的东部边界流上升流系统，澳大利亚西部和东南部生产力较低的沿海地区以及贫营养海洋之间。但是，EGAB上升流热点的每日生产率与本格拉和洪堡潮流中的生产力相抗衡。

著录项

  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第3期|p.142-158|共17页
  • 作者

    Paul D. van Ruth; George G. Ganf; Tim M. Ward;

  • 作者单位

    South Australian Research and Development Institute (Aquatic Sciences), PO Box 120, Henley Beach, Adelaide, South Australia 5022, Australia,School of Earth and Environmental Sciences, The University of Adelaide, South Australia 5005, Australia;

    rnSchool of Earth and Environmental Sciences, The University of Adelaide, South Australia 5005, Australia;

    rnSouth Australian Research and Development Institute (Aquatic Sciences), PO Box 120, Henley Beach, Adelaide, South Australia 5022, Australia,School of Earth and Environmental Sciences, The University of Adelaide, South Australia 5005, Australia;

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

    primary productivity; coastal upwelling; euphotic depth; deep chlorophyll maxima; great australian bight;

    机译：初级生产力;沿海上升流;富营养深度深叶绿素最大值伟大的澳大利亚湾;

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