• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Chemistry >Distribution and air-sea exchange of nitrous oxide in the coastal Bay of Bengal during peak discharge period (southwest monsoon)
【24h】

Distribution and air-sea exchange of nitrous oxide in the coastal Bay of Bengal during peak discharge period (southwest monsoon)

机译：高峰排放期（西南季风）孟加拉湾沿海地区一氧化二氮的分布和海-气交换

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

In order to examine the impact of river discharge from the Indian subcontinent on the concentration and air-sea exchange of nitrous oxide (N_2O) a study was conducted during peak discharge period in the coastal Bay of Bengal, The study revealed that freshwater discharge exerts a dominant control on the N_2O cycling in the surface waters of the coastal Bay of Bengal. The surface concentration of N_2O in the southwestern (SW) coastal Bay of Bengal was high (7.4 ± 1.6 nM) and supersaturated (126 ± 27%) whereas contrasting trend was found in the northwestern (NW) region (4.9 ± 0.3 nM and 81 ± 6%). Such spatial differences in N_2O concentration and saturation were resulted from variable characteristics of the discharged waters, and vertical stratification. The NW region of the coastal Bay of Bengal was under the influence of the discharge from the Ganges River having N_2O below the saturation in the estuary (82 ± 5%) while the SW region was under the influence of peninsular river discharges that were super-saturated (187 ± 29%). The low N_2O concentration at NW region resulted from low concentrations in the source water (Ganges) as these waters were formed by melting of the Himalayan glacier where low ammonium concentrations were observed due to less human settlement resulting in lower nitrification rates. Higher concentration of N_2O in the SW region was attributed to the discharge from monsoonal rivers containing high N_2O concentrations, high nitrification rates and mild coastal upwelling. The sea-to-air fluxes of N_2O suggest that NW region is a sink for atmospheric N_2O due to discharge of under saturated water from Ganges and strong stratification while SW region is a source caused by coastal upwelling and discharge of highly saturated water from monsoonal rivers.
机译：为了研究印度次大陆的河流排放对一氧化二氮（N_2O）的浓度和海气交换的影响，在孟加拉湾沿海排放高峰期进行了一项研究，该研究表明淡水排放对大气中亚硝酸盐的排放产生了一定的影响。对孟加拉湾沿海地表水N_2O循环的显性控制。孟加拉西南（SW）沿海湾的N_2O表面浓度较高（7.4±1.6 nM）且过饱和（126±27％），而西北（NW）区域则存在相反的趋势（4.9±0.3 nM和81） ±6％）。 N_2O浓度和饱和度的这种空间差异是由排放水的可变特征和垂直分层引起的。孟加拉湾沿海西北地区受到恒河排放的影响，恒河的N_2O低于河口饱和度（82±5％），西南地区则受到半岛河流排放的影响，其中饱和（187±29％）。 NW区N_2O浓度低是源水（恒河）中浓度低所致，因为这些水是由喜马拉雅冰川融化形成的，由于人类沉降减少，导致硝化速率降低，从而观察到铵浓度较低。西南地区N_2O的浓度较高归因于季风河排放的N_2O浓度高，硝化率高且沿海上升流温和。 N_2O的海气通量表明，西北地区是恒河中大气N_2O的汇聚区，这是由于恒河中的饱和水排放不足和强烈的分层作用，而西南地区是沿海上升流和季风河中高饱和水的排放源。

著录项

  • 来源
    《Marine Chemistry》 |2013年第20期|1-9|共9页
  • 作者

    G.D. Rao; V.D. Rao; V.V.S.S. Sarma;

  • 作者单位

    CSIR-National Institute of Oceanography, Regional Centre. 176 Lawson's Bay Colony, Visakhaptnam 530 017, India;

    CSIR-National Institute of Oceanography, Regional Centre. 176 Lawson's Bay Colony, Visakhaptnam 530 017, India;

    CSIR-National Institute of Oceanography, Regional Centre. 176 Lawson's Bay Colony, Visakhaptnam 530 017, India;

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

    Nitrous oxide; River discharge; Coastal bay of Bengal; South West Monsoon;

    机译：笑气;河流排放;孟加拉沿海湾;西南季风;

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