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首页> 外文期刊>Frontiers of earth science >Nitrogen uptake by phytoplankton in surface waters of the Indian sector of Southern Ocean during austral summer
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Nitrogen uptake by phytoplankton in surface waters of the Indian sector of Southern Ocean during austral summer

机译：夏季南方南部海洋印度洋表层水域浮游植物对氮的吸收

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摘要

This study reports the nitrogen uptake rate (using 15N tracer) of phytoplankton in surface waters of different frontal zones in the Indian sector of the Southern Ocean (SO) during austral summer of 2013. The investigated area encompasses four major frontal systems, i.e., the subtropical front (STF), subantarctic front (SAF), polar front-1 (PF1) and polar front-2 (PF2). Southward decrease of surface water temperature was observed, whereas surface salinity did not show any significant trend. Nutrient (NO3 (-) and SiO4 (4-)) concentrations increased southward from STF to PF; while ammonium (NH4 (+)), nitrite (NO2 (-)) and phosphate (PO4 (3-)) remained comparatively stable. Analysis of nutrient ratios indicated potential N-limited conditions at the STF and SAF but no such scenario was observed for PF. In terms of phytoplankton biomass, PF1 was found to be the most productive followed by SAF, whereas PF2 was the least productive region. Nitrate uptake rate increased with increasing latitude, as no systematic spatial variation was discerned for NH4 (+) and urea (CO(NH2)(2)). Linear relationship between nitrate and total N-uptake reveals that the studied area is capable of exporting up to 60% of the total production to the deep ocean if the environmental settings are favorable. Like N-uptake rates the f-ratio also increased towards PF region indicating comparatively higher new production in the PF than in the subtropics. The moderately high average f-ratio (0.53) indicates potentially near equal contributions by new production and regenerated production to the total productivity in the study area. Elevation in N-uptake rates with declining temperature suggests that the SO with its vast quantity of cool water could play an important role in drawing down the atmospheric CO2 through the "solubility pump".
机译：这项研究报告了2013年夏季南方南部海洋（SO）的不同锋区地表水中浮游植物的氮吸收率（使用15N示踪剂）。研究区域包括四个主要的额叶系统，即亚热带锋面（STF），亚南极锋面（SAF），极地锋1（PF1）和极地锋2（PF2）。观察到地表水温度向南下降，而地表盐度未显示任何明显趋势。营养盐（NO3（-）和SiO4（4-））的浓度从STF到PF向南增加；铵（NH4（+）），亚硝酸盐（NO2（-））和磷酸盐（PO4（3-））保持相对稳定。营养比分析表明，在STF和SAF可能存在氮限制条件，但在PF中未观察到这种情况。就浮游生物的生物量而言，发现PF1的生产力最高，其次是SAF，而PF2的生产力最低。硝酸盐吸收率随纬度的增加而增加，因为未发现NH4（+）和尿素（CO（NH2）（2））的系统空间变化。硝酸盐和总氮吸收量之间的线性关系表明，如果环境条件有利，该研究区能够将总产量的60％出口到深海。像氮吸收率一样，f比率也朝着PF区域增加，这表明PF中的新产量要比亚热带地区高。中等较高的平均f比率（0.53）表示新生产和再生生产对研究区域总生产率的潜在贡献几乎相等。氮吸收率随温度降低而升高，表明SO及其大量冷水在通过“溶解度泵”吸收大气中的CO2方面起着重要作用。

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  • 来源
    《Frontiers of earth science》 |2018年第1期|52-62|共11页
  • 作者

    Tripathy S. C.; Patra Sivaji; Vardhan K. Vishnu; Sarkar A.; Mishra R. K.; Anilkumar N.;

  • 作者单位

    Minist Earth Sci, ESSO Natl Ctr Antarctic & Ocean Res, Vasco Da Gama 403804, Goa, India;

    Minist Earth Sci, ESSO Integrated Coastal & Marine Area Management, NIOT Campus, Chennai 600100, Tamil Nadu, India;

    Minist Earth Sci, ESSO Integrated Coastal & Marine Area Management, NIOT Campus, Chennai 600100, Tamil Nadu, India;

    Minist Earth Sci, ESSO Natl Ctr Antarctic & Ocean Res, Vasco Da Gama 403804, Goa, India;

    Minist Earth Sci, ESSO Natl Ctr Antarctic & Ocean Res, Vasco Da Gama 403804, Goa, India;

    Minist Earth Sci, ESSO Natl Ctr Antarctic & Ocean Res, Vasco Da Gama 403804, Goa, India;

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  • 正文语种 eng
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  • 关键词

    nitrogen uptake; f-ratio; new productivity; frontal zones; Southern Ocean;

    机译：氮素吸收;f比;新生产力;额带;南大洋;

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