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Temporal Variability of Primary Primaty Production and Energy Flow in the Arctic Sea Ice Area.

北极海冰区初级生物生产和能量流的时间变化。

基本信息

批准号：
63044144
负责人：
HOSHIAI Takao
金额：
$ 14.08万
依托单位：
National Institute of Polar Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The principal objective of "Temporal variability of primary production and energy flow in the Arctic sea ice area (PREFLA program)" is to clarify the biological processes peculiar to the existence of seasonal sea ice ; temporal changes of primary production and its sedimentation and decomposition proses, dynamics of zooplankton and micronekton, and link to high trophic levels. The program is planned for three years from 1988-1990.In the northern Bering and Chukchi Seas, where exists one of the productive seasonal sea ice areas, and an interdisciplinary oceanographic study (ISHTAR : Inner Shelf Transfer and Recycling : NSF-DPP 84-05286) is carried out to clarify the biological processes and fluxes associated with water movements along the Anadyr Current into the Chukchi Sea. The study revealed that high primary and secondary productivities in the water column as well as high benthic biomass are found in two areas of the northern Bering and Chukchi Seas in the Bering Shelf-Anadyr Water. However, the direct time series observation on downward flux to link the surface primary production and the benthic production has not yet been made. Therefore, the PREFLA program was focused on the two areas in cooperation with the ISHTAR program.Observation of downward particle flux in the Chirikov Basin revealed that total particulate organic carbon flux varied within a range of 253 - 654 mg/m^2/day. Relatively low C/N ratios (4.9 - 7.4) indicated a fresh organic matter supply to the benthic communities. Mean organic carbon flux (501mg/m^2/day) is comparable to the estimated organic carbon utilization (464mg/m^2/day) at surface sediments suggesthing the close correspondence between the particulate flux and the benthic biomass of the Chirikov depocenter. Concurrently, a total of 77 plankton samples were collected from 5 cruises in three years. These samples revealed that three major plankton communities exist in concidence with the three prevailing water masses.

北极海冰区初级生产和能量流动的时间变异性(PREFLA方案)“的主要目标是澄清季节性海冰特有的生物过程；初级生产及其沉积和分解的时间变化；浮游动物和微型浮游动物的动态以及与高营养层的联系。该计划从1988年到1990年为期三年。在白令海和楚科奇海北部，那里是季节性海冰产生区之一，并进行了一项跨学科的海洋学研究(ISHTAR：内陆架转移和再循环：国家科学基金会-DP 84-05286)，以澄清与阿纳迪尔洋流进入楚科奇海的水运动有关的生物过程和通量。研究表明，白令海北部和楚科奇海北部白令架-阿纳迪尔水域的水柱初级和次生生产力以及底栖生物生物量都很高。然而，将表层初级生产力与底栖生物生产力联系起来的向下通量的直接时间序列观测尚未见报道。因此，PREFLA计划与Ishtar计划合作将重点放在这两个地区。对奇里科夫盆地向下的颗粒物通量的观测表明，总颗粒有机碳通量在253-654 mg/m2/天的范围内变化。相对较低的C/N比(4.9-7.4)表明底栖生物群落获得了新鲜的有机质供应。表层沉积物的平均有机碳通量(501 mg/m~2/d)与估算的有机碳利用率(464 mg/m~2/d)相当，表明颗粒通量与Chirikov沉积物中心底栖生物量之间存在着密切的对应关系。同时，在三年的时间里，从5个邮轮采集了77个浮游生物样本。这些样本表明，三个主要的浮游生物群落与三个主要的水团一致。