Coastal marine megaripple fields are metabolic hotspots with highly dynamic oxygen exchange

Coastal marine megaripple fields are metabolic hotspots with highly dynamic oxygen exchange
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沿海海洋巨波纹场是具有高度动态氧交换的代谢热点

DOI:
10.1002/lol2.10345
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发表时间:
2023
影响因子:
7.8
通讯作者:
Huettel, Markus
Huettel, Markus
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Berg, Peter;Huettel, Markus

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巨波是海流产生的海底底形,由分选良好的沙子或砾石组成,波长超过1米。在这项水生涡动协方差研究中,我们测量了浅水桑迪巨型瀑布场暴露于强潮汐驱动电流和强烈阳光下的底栖生物初级生产和呼吸的大速率。电流和光是高动态氧气交换的主要短期驱动因素。白天的氧气释放高达300 mmol m−2d− 1,夜间的氧气吸收高达−100 mmol m−2d− 1,这可能是由于电流驱动的氧气、营养物质和有机物(燃料)进出沙子的运输,以及快速的内部循环。4月和9月之间的温度(45%)和光照(69%)的季节性差异是9月初级生产总值和呼吸速率大幅提高的主要长期驱动因素。巨砾是一个强烈的代谢热点,其碳循环速率大于大多数近海岸沉积物。
Megaripples are current‐generated seafloor bedforms of well‐sorted sand or gravel and wavelengths over 1 m. In this aquatic eddy covariance study, we measured large rates of benthic primary production and respiration for a shallow‐water sandy megaripple field exposed to strong tidally driven currents and intense sunlight. Current and light were the main short‐term drivers of a highly dynamic oxygen exchange. Daytime oxygen release as high as 300 mmol m−2d−1and nighttime oxygen uptake up to −100 mmol m−2d−1were likely sustained by current‐driven transport of oxygen, nutrients, and organic matter (fuel) into and out of the sand and superimposed by rapid internal cycling. Seasonal differences in temperature (45%) and light (69%) between April and September were the main long‐term drivers of substantially greater rates of gross primary production and respiration in September. The megaripples functioned as an intense metabolic hotspot with carbon cycling rates larger than those of most near‐shore sediments.
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