Short‐term variability in the open ocean cycle of dimethylsulfide
Short‐term variability in the open ocean cycle of dimethylsulfide
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DOI：
10.1029/1999gb900081
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发表时间：
1999-12
影响因子：
5.2
通讯作者：
R. Simó;C. Pedrós-Alió
中科院分区：
文献类型：
--
作者：
R. Simó;C. Pedrós-Alió
在60°N 21°W的亚极地北大西洋进行了为期2周的拉格朗日实验，研究了二甲基硫（DMS）的海洋地球化学循环，二甲基硫是全球大气中硫的主要天然来源。在第一周，主要是Emiliania huxleyi种的球石孢子的大量繁殖主导了浮游植物组合。在整个实验过程中，发现高表面浓度的二甲基磺基丙酸酯（DMSP，37-70 nM）以及沿着中等DMS浓度（3-9 nM）。在表层海水的短期黑暗培养中测量了生物DMSP消耗率（8-51 nM d −1）和DMS生产率（1-14 nM d−1）和消耗率（0-6 nM d−1）。DMSP生物合成速率（11-31 nM d−1）和DMS光化学损失速率（1-10 nM d−1）通过拉格朗日采样之间的预算浓度和转化速率进行估算。DMS（0.03-3 nM d−1）的海气交换率是根据表面浓度、海水温度和风速计算的。DMS循环中涉及的所有主要过程都表现出与太阳辐射、风速和混合变化耦合的显著短期变化。生物和非生物二甲硫醚周转率的幅度相似，非常动态，对迅速变化的物理环境迅速作出反应。气象强迫因子对DMS循环的快速影响为硫介导的短期浮游生物/气候相互作用提供了基础。
The marine biogeochemical cycle of dimethylsulfide (DMS), the main natural source of sulfur to the global atmosphere, was studied during a 2‐week Lagrangian experiment in the subpolar North Atlantic, at 60°N 21°W. A bloom of coccolithopores, mostly of the species Emiliania huxleyi, dominated the phytoplankton assemblage over the first week. High surface concentrations of dimethylsulfoniopropionate (DMSP, 37–70 nM) were found along with moderate DMS concentrations (3–9 nM) during the entire experiment. Rates of biological DMSP consumption (8–51 nM d−1) and DMS production (1–14 nM d−1) and consumption (0–6 nM d−1) were measured in short‐term dark incubations of surface seawater. Rates of DMSP biosynthesis (11–31 nM d−1) and DMS photochemical loss (1–10 nM d−1) were estimated by budgeting concentrations and transformation rates between Lagrangian samplings. Air‐sea exchange rates for DMS (0.03–3 nM d−1) were calculated from surface concentrations, seawater temperature, and wind speed. All major processes involved in the DMS cycle showed significant short‐term variability in coupling to the variability of solar radiation, wind speed, and mixing. Biotic and abiotic DMS turnover rates were of similar magnitude and very dynamic, with a prompt response to a rapidly changing physical environment. The rapid impact of meteorological forcing factors on DMS cycling provides the basis for a sulfur‐mediated, short‐term plankton/climate interaction.