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首页 > 中国极地考察知识库 > 成果信息库 > 已审查 白令海和楚科奇海陆架区的生源物质埋藏通量研究

白令海和楚科奇海陆架区的生源物质埋藏通量研究

【标题】白令海和楚科奇海陆架区的生源物质埋藏通量研究

【Title】Burial fluxes of biogenic materials in Bering Sea and Chukchi Sea

【作者】 林武辉; 陈立奇; 余雯; 马豪; 曾志; 曾实

【Author】 Lin Wuhui ; Chen Liqi ; Yu Wen ; Ma Hao ;

【期刊】极地研究

【Journal】

【期刊年份】2016

【卷】28

【期】2

【关键词】 生源物质; 埋藏通量; 沉积速率; 混合因子; 210 Pb

【Keywords】 biogenic materials; burial flux; sediment accumulation rate; particle mixing coefficient; 210 Pb

【摘要】楚科奇海和白令海通过白令海峡相连,是气候变化研究的关键区域。利用210Pb过剩法开展两个海域沉积过程和生源物质的埋藏通量研究。研究发现,白令海陆架区沉积柱样(NB22)受到生物扰动影响,楚科奇海沉积物柱样(R17)所受生物扰动很小。通过建立模型,获得楚科奇海陆架区的沉积速率为0.6±0.1 mm/a,白令海陆架区的沉积速率为2.1±0.7 mm/a。忽略沉积过程,白令海陆架区由生物扰动引起的混合因子为1.38±0.92 cm2/a;考虑沉积过程,则混合因子为0.65±0.95 cm2/a。白令海的有机碳、生源硅、CaCO3的埋藏通量分别为:6.85 mmol C m-2d-1、37.7 mmol Si m-2d-1、3.15 mmol C m-2d-1;楚科奇海的有机碳、生源硅、CaCO3的埋藏通量分别为:5.71 mmol C m-2d-1、9.78 mmol Si m-2d-1、3.08 mmol C m-2d-1。楚科奇海陆架区具有高效的垂直输运的海洋生物泵,白令海陆架区海洋生物泵可能存在较强的水平输运过程。海洋沉积物中210Pb信号不仅可以定量沉积速率和埋藏通量,也在一定程度上反映海洋底栖生物的扰动强度。

【Abstract】The Chukchi and Bering Seas are connected by the Bering Strait. To investigate the impact of climate change in this region, excess 210Pb was measured to compare sedimentary processes between the two seas. Results for the Bering Sea station demonstrated an effect from benthic fauna, whereas biological activity at the Chukchi Sea station was limited. The sediment accumulation rate was 0.6 ± 0.1 mm/a and 2.1 ± 0.07 mm/a in the Chukchi Sea and Bering Sea, respectively. The particle mixing coefficient related to benthic fauna at the Bering Sea station was 1.38 ± 0.92 cm2·a-1 without considering sediment processes and 0.65 ± 0.95 cm2/a considering sediment processes. Burial fluxes of organic carbon, biogenic opal, and CaCO3 in the Bering Sea were 6.85 mmol C·m-2·d-1, 37.7 mmol Si·m-2·d-1, and 3.15 mmol C·m-2·d-1, respectively, and in the Chukchi Sea were 5.71 mmol C·m-2·d-1, 9.78 mmol Si·m-2·d-1, and 3.08 mmol C·m-2·d-1, respectively. Vertical transport by a high efficiency marine biological pump characterized the Chukchi Sea station, whereas lateral transport was predominant at the Bering Sea shelf station. Therefore, 210Pb in marine sediments could be applied not only to quantify sediment accumulation rates and burial fluxes of biogenic materials but also to indicate the intensity of biological activity in benthic environments.

【基金/项目】 中国极地科学战略研究基金项目 ; 南北极环境综合考察与评估专项项目专项 ; 南大洋N2O源汇格局:驱动机制及其对海洋N2O收支的影响 ; 南大洋海冰区二甲基硫海-气交换过程及其对含硫气溶胶组成的影响研究 ; 国家863项目极区大气环境遥感监测技术

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