Characteristics of particle fluxes in the Prydz Bay polynya, Eastern Antarctica
Characteristics of particle fluxes in the Prydz Bay polynya, Eastern Antarctica
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东部普里兹湾冰间湖颗粒流动特征。
DOI：
10.1007/s11430-018-9285-6
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发表时间：
2019-02
期刊：
影响因子：
--
通讯作者：
Weiping SUN
中科院分区：
文献类型：
--
作者：
Zhengbing HAN;Chuanyu HU;Weiping SUN
海水中颗粒碳的沉降是海洋碳循环的一个关键组成部分。2010年12月至2011年12月，我们部署了一套沉积物收集器，在普里兹湾的冰间湖，调查颗粒通量的季节变化。有一个明显的季节变化的颗粒通量，最大和最小通量记录在夏季和冬季，分别。采样期间的平均总通量为193.58 mg m−2d−1，有机碳（Corg）、无机碳（Cinorg）和生物硅（Sibio）的平均通量分别为721.78、28.67和2382.80 μmol m−2d−1。Sibio是总质量通量的主要贡献者，与Corg有较强的相关性。Sibio/Corg的摩尔比大于1，表明Corg与Sibio一起被迁移到深海。通过对比海冰和上层水体叶绿素的遥感数据，我们发现碳通量的动态变化与海冰的变化密切相关。海冰中的藻类可能在初夏的生物泵过程中发挥关键作用。除了冰藻水华期，碳通量的变化一般对应于浮游植物水华在上层水。压载效应控制颗粒沉降速度和生物泵效率。海冰筏引发了第一次颗粒输出事件，并在融化期间提高了颗粒沉降效率。由于硅藻可能在无冰区中变得不那么占优势，海冰损失可能导致生物泵效率的效率长期下降。
The settling of particulate carbon in seawater is a key component of the ocean carbon cycle. We deployed a set of sediment trap in the polynya of Prydz Bay from December 2010 to December 2011 to investigate the seasonal variations in particle fluxes. There was a clear seasonal variation in the particle fluxes, with maximum and minimum fluxes recorded during the summer and winter, respectively. The average total flux over the sampling period was 193.58 mg m−2d−1, and the average fluxes of organic carbon (Corg), inorganic carbon (Cinorg), and biogenic silica (Sibio) were 721.78, 28.67, and 2382.80 μmol m−2d−1, respectively. Sibiowas the main contributor to the total mass flux, and strongly correlated with Corg. The high Sibio/Corgmolar ratios (>1) suggest that Corgwas transported to deep sea in association with Sibio. By comparing remote sensing data of sea ice and chlorophyll in the upper water column, we found that the dynamics of carbon fluxes were closely related to changes in sea ice. Algae in sea ice may have a key role in biological pump processes in early summer. Apart from the ice algae bloom period, variations in carbon fluxes generally corresponded with phytoplankton blooms in the upper water. The ballast effect controlled the particle settling velocity and the efficiency of the biological pump. Sea ice rafts initiated the first particle export event and enhanced the particle settling efficiency during melting period. As diatoms might become less dominant in the ice-free area, sea ice loss may cause the efficiency of the biological pump efficiency to decrease over the long term.
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