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首页> 外文期刊>Marine Chemistry >Seasonal and latitudinal variability of the CO_2 system in the western English Channel based on Voluntary Observing Ship (VOS) measurements
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Seasonal and latitudinal variability of the CO_2 system in the western English Channel based on Voluntary Observing Ship (VOS) measurements

机译：基于自愿观测船（VOS）测量的西英吉利海峡CO_2系统的季节性和纬度变化

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摘要

We investigated the dynamics of the CO_2 system across the Western English Channel (WEC) between Roscoff (France) and Plymouth (UK) using a Voluntary Observing Ship (VOS). From December 2010 to December 2011, 20 return crossings were carried out to collect a comprehensive dataset of CO_2 system parameters and ancillary data. The hydrographical structure of the water column across the latitudinal transect was investigated at 3 fixed stations: ASTAN (southern WEC, offshore Roscoff), El and L4 (northern WEC, offshore Plymouth). Based on these profiles, we defined two provinces, the stratified northern WEC (＞49.5°N) and the well-mixed southern WEC (＜49.5°N), which were periodically separated by a thermal front. These contrasted hydrographical properties strongly influenced the ecosystem dynamics. Biological production/respiration processes were the main driver of pCO_2 variability during the year except for winter cooling in the northern WEC. The seasonally stratified northern WEC showed enhanced biological activities characterized by an extensive autotrophic phase, which maintained the pCO_2 below the atmospheric equilibrium until early fall and acted as a sink for atmospheric CO_2 at a rate of 1.1 mol C m~(-2) y~(-1). The permanently well mixed southern WEC was characterized by a shorter autotrophic phase due to a delayed spring phytoplankton growth and an early start of the fall heterotrophic phase, resulting in an annual air-sea CO_2 flux close to equilibrium at a rate of -0.4 mol C m~(-2) y~(-1). On annual scale, calculation of Net Ecosystem Production (NEP) revealed that surface waters at El and ASTAN were both autotrophic at rates of 1.5 mol C m~(-2) y~(-1) and 1.0 mol C m~(-2) y~(-1) respectively. Our latitudinal approach resolved the discrepancy between the directions of the fluxes in the WEC observed in previous studies by differentiating between the hydrological regions. The combined approach of using data from VOS tracks and fixed coastal observatories stations provided new insights into the control of air-sea CO_2 fluxes in the different provinces of the WEC. This combined approach could be applied in other continental shelf systems where data on the CO_2 system are sparse.
机译：我们使用自愿观测船（VOS）调查了Roscoff（法国）和Plymouth（英国）之间的西英语海峡（WEC）上CO_2系统的动力学。从2010年12月至2011年12月，进行了20次回程，以收集CO_2系统参数和辅助数据的综合数据集。在3个固定站上研究了横断面横断面水柱的水文结构：ASTAN（南WEC，罗斯科夫近海），E1和L4（北WEC，普利茅斯近海）。根据这些剖面，我们定义了两个省份，即分层的北西经线（> 49.5°N）和混合良好的南西经线（<49.5°N），它们通过热锋周期性地分开。这些相反的水文特性强烈影响了生态系统的动力学。除WEC北部的冬季降温外，一年中生物生产/呼吸过程是pCO_2变异的主要驱动力。季节性分层的北部WEC表现出增强的生物活性，其特征是广泛的自养阶段，使pCO_2保持在大气平衡以下，直到初秋，并以1.1 mol C m〜（-2）y〜的速率吸收了大气中的CO_2。 （-1）。永久混合良好的南部WEC的特征是由于春季浮游植物的生长延迟和秋季异养期的提前开始而导致自养期缩短，从而导致以-0.4 mol C的速率接近平衡的年度海气CO_2通量m〜（-2）y〜（-1）。在年尺度上，净生态系统生产（NEP）的计算表明，El和ASTAN的地表水都是自养的，速率分别为1.5 mol C m〜（-2）y〜（-1）和1.0 mol C m〜（-2 ）y〜（-1）。我们的纬度方法通过区分水文区域，解决了以前研究中观察到的WEC中通量方向之间的差异。利用来自VOS航迹和沿海固定观测站的数据的组合方法，为控制WEC不同省份的气海CO_2通量提供了新的见识。这种组合方法可以应用于其他稀疏的大陆架系统，其中CO_2系统上的数据稀疏。

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  • 来源
    《Marine Chemistry》 |2013年第20期|29-41|共13页
  • 作者

    P. Marrec; T. Cariou; E. Collin; A. Durand; M. Latimier; E. Mace; P. Morin; S. Raimund; M. Vernet; Y. Bozec;

  • 作者单位

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    Department of Marine Biogeochemistry, Leibniz-Institute of Marine Science, Kiel, Germany;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

    CNRS, UMR 7144, Equipe Chimie Marine, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France UPMC Univ. Paris 06, UMR 7144, Adaptation et Diversite en Milieu Marin, SBR, 29680 Roscoff, France;

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

    Carbon dioxide; Air-sea CO_2 exchange; Western English Channel; Voluntary Observing Ship;

    机译：二氧化碳;海海CO_2交换;西方英语频道;自愿观察船;

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