Transport of chemical components in sea ice and under-ice water during melting in the seasonally ice-covered Saroma-ko Lagoon, Hokkaido, Japan
Transport of chemical components in sea ice and under-ice water during melting in the seasonally ice-covered Saroma-ko Lagoon, Hokkaido, Japan
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日本北海道季节性冰覆盖的佐吕间湖泻湖融化期间海冰和冰下水中化学成分的迁移
DOI：
10.1016/j.ecss.2008.10.012
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发表时间：
2009
影响因子：
2.8
通讯作者：
H. Yoshikawa‐Inoue
中科院分区：
文献类型：
--
作者：
Daiki Nomura;Toru Takatsuka;M. Ishikawa;T. Kawamura;K. Shirasawa;H. Yoshikawa‐Inoue
2006年2月中旬至3月中旬，在日本北海道东北海岸与鄂霍次克海相连的Saroma-ko泻湖，测定了盐水和冰下水的物理化学性质。采用一种新的取样方法对海冰卤水通道内的卤水进行了取样。海冰融化期间，位于泻湖东南部的萨罗马别河流量因融雪而显著增加，海冰卤水通道和冰下卤水中的盐度、溶解无机碳（DIC）、总碱度（TA）、溶解氧（DO）、营养盐和氧同位素比值（δ 18 O）在时间和空间上都发生了很大变化。2006年3月中旬，冰下羽流从河口延伸至4.5公里，将河流提供的化学成分输送到泻湖。冰下河水很可能是通过海冰中发育良好的盐水通道输送到海冰中的，这是由于海冰上沉积的降雪负荷导致水通过盐水通道向上冲刷。这些结果表明，河水羽流在供应化学成分到海冰，这可能是一个关键的过程，影响季节性冰覆盖的Saroma-ko泻湖的海洋地球化学循环中起着重要的作用。
Physico-chemical properties in the brine and under-ice water were measured in Saroma-ko Lagoon on the northeastern coast of Hokkaido, Japan, which is connected to the Sea of Okhotsk, during the period from mid-February through mid-March 2006. The brine within brine channels of the sea ice was collected with a new sampling method examined in this study. Salinity, dissolved inorganic carbon (DIC), total alkalinity (TA), dissolved oxygen (DO), nutrients and oxygen isotopic ratio (δ18O) contained in the brine within brine channels of the sea ice and in the under-ice water varied largely in both time and space during the ice melt period, when discharge from Saromabetsu River located on the southeast of the lagoon increased markedly due to the onset of snow melting. The under-ice plume expands as far as 4.5km from the river mouth at mid-March 2006, transporting chemical components supplied from the river into the lagoon. The under-ice river water was likely transported into the sea ice through well-developed brine channels in the sea ice due to upward flushing of water through brine channels occurred by loading of snowfalls deposited over the sea ice. These results suggest that the river water plume plays an important role in supplying chemical components into the sea ice, which may be a key process influencing the biogeochemical cycle in the seasonally ice-covered Saroma-ko Lagoon.