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首页> 外文期刊>Marine Chemistry >Seasonal variations in settling fluxes of major components in the oligotrophic Shikoku Basin, the western North Pacific: coincidence of high biogenic flux with Asian dust supply in spring
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Seasonal variations in settling fluxes of major components in the oligotrophic Shikoku Basin, the western North Pacific: coincidence of high biogenic flux with Asian dust supply in spring

机译：北太平洋西部贫营养型四国盆地主要成分沉降通量的季节性变化：春季高生源通量与亚洲粉尘供应的巧合

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Time-series sediment traps were deployed at ca. 500 m below the sea surface (upper) and ca. 500 m above the sea bottom (lower) at station SHIBT (29°30′ N, 135°15′ E, ca. 4600 m water depth) near the center of oligotrophic subtropical gyre of the Shikoku Basin in the western North Pacific from February to December 1999 and from June to September 2000 to collect settling particle samples with high time resolution (2.5 days in spring 1999). Major components of settling particles, i.e., CaCO_3, Fe-Mn oxyhydroxide (ERFe-Mn), organic matter (OM), opal and lithogenic aluminosilicate (clay), were measured by stepwise leaching. Strontium isotope ratio and grain size of clay fraction were also determined. Average total mass fluxes were 18.9 and 57.4 mg m~(-2) day~(-1) in the upper and lower traps from February to early December 1999, respectively, and 3.8 and 58.0 mg m~(-2) day~(-1) in the upper and lower traps from June to September 2000, respectively. Total biogenic flux (CaCO_3+OM+opal) in the upper trap accounted for 93% of total mass flux in 1999. CaCO_3 was the dominant component in the upper and lower traps. Seasonal variations in settling fluxes of major components were observed for almost 1 year. High biogenic fluxes with four peaks were observed in spring, i.e., four times of spring blooms occurred in the euphotic zone from February to May 1999. Estimated export flux of particulate organic carbon from the euphotic zone was 6.2 mg C m~(-2) day~(-1) on average in 1999, and 9.0 mg C m~(-2) day~(-1) on average during the high biological production period in spring. ~(87)Sr/~(86)Sr ratio of clay fraction fell within the range of 0.7163-0.7188 in spring, which was consistent with that of Asian loess and dust. This indicates that the clay fraction was mainly composed of Asian dust via eolian transport in spring 1999. The high biogenic flux accompanying Asian dust coincided with Asian dust supply with time lag in early spring 1999. The coincidence of high biogenic flux with Asian dust supply suggests the possibility that high biological production in the oligotrophic subtropical Shikoku Basin might be affected by the Asian dust supply in spring.
机译：时间序列沉积物捕集器部署在约。海面以下（上部）500 m左右自2月起在北太平洋西部四国盆地的贫营养亚热带回旋中心附近的SHIBT站（29°30′N，135°15′E，大约水深4600 m）海底（下部）上方500 m从1999年12月至2000年6月至2000年9月，以高时间分辨率（1999年春季为2.5天）收集沉降颗粒样品。沉降颗粒的主要成分，即CaCO 3，Fe-Mn羟基氧化物（ERFe-Mn），有机物（OM），蛋白石和成石的铝硅酸盐（粘土），是通过逐步浸出法测量的。还确定了锶同位素比和粘土级分的粒度。 1999年2月至12月上旬，上，下圈闭的平均总质量通量分别为18.9和57.4 mg m〜（-2）day〜（-1），分别为3.8和58.0 mg m〜（-2）day〜（-1）。 -1）分别于2000年6月至2000年9月在上层和下层陷阱中。 1999年上层陷阱的总生物通量（CaCO_3 + OM +蛋白石）占总质量通量的93％。CaCO_3是上层陷阱和下层陷阱的主要成分。近1年观察到主要成分的沉降通量存在季节性变化。春季观测到了具有四个峰值的高生物通量，即从1999年2月至5月在富营养区发生了四次春季水华。估计来自富营养区的颗粒有机碳的出口通量为6.2 mg C m〜（-2）。 1999年平均日剂量为（-1），春季高生物生产期平均为9.0​​ mg C m〜（-2）天（-1）。春季粘土含量的〜（87）Sr /〜（86）Sr比值在0.7163-0.7188范围内，与亚洲黄土和粉尘的比值相符。这表明在1999年春季粘土部分主要通过风尘运移而由亚洲扬尘组成。伴随亚洲扬尘的高生物成因通量与亚洲扬尘的供应同时存在时滞，这与1999年春季初存在时滞。春季，亚洲亚粉尘供应可能会影响贫营养亚热带四国盆地高生物产量。

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