Seasonal and annual dynamics of particulate carbon flux in the Barents Sea
Seasonal and annual dynamics of particulate carbon flux in the Barents Sea
复制标题
巴伦支海颗粒碳通量的季节和年度动态
DOI：
10.1007/bf01681977
复制
发表时间：
1993
期刊：
影响因子：
1.7
通讯作者：
D. Slagstad
中科院分区：
文献类型：
--
作者：
P. Wassmann;D. Slagstad
1981年至1983年期间，在巴伦支海中部，用数学模型探讨了72°和80°N之间初级生产力、新生产力和次级生产力以及沉积的季节和年度变化。1981年和1982年是大面积冰层覆盖的年份，而1983年海冰很少。受温度分层和海冰动力学的影响，春季浮游植物水华通常在75°N附近的4/5月开始，南部从5/6月推迟到北部的8/9月。该模型表明，几个，同时春季水华事件，在空间上分离，可以找到，特别是在低冰覆盖的年份。在巴伦支海南部和北方，初级生产力、次级生产力和沉积的年估计数分别从73、7.3和48克C/m-2年-1降至18、1.8和9克C/m-2年-1。与1981-1982年相比，1983年颗粒碳通量的年度估计值要高得多，特别是在北部，1983年计算的比率高出6倍。春季巴伦支海南部浮游动物物种的数量受越冬成功的影响，但也可能受到大西洋水平流的影响。该模型在大西洋水域运行，3月份每平方米有10，000、3，000或没有桡足类，表明仅由于浮游动物的摄食，沉积可以在38和61 g C m−2年−1之间变化。这表明，有机碳的供应的巴伦支海的无光区的浮游植物水华的强度和持续时间，但强烈影响浮游动物的动态。
Mathematical modelling was used to explore the seasonal and annual variability of primary, new and secondary production as well as sedimentation between 72° and 80°N in the central Barents Sea during the years 1981 to 1983. 1981 and 1982 were years with extensive ice coverage while 1983 experienced little sea-ice. The phytoplankton “spring” bloom started usually in April/May at about 75°N and was delayed from May/June in the south to August/September in the north as a function of thermal stratification and sea-ice dynamics. The model indicates that several, simultaneous spring bloom events, separated in space, can be found, especially during years with low ice coverage. The annual estimates of primary production, secondary production and sedimentation decreased on average from 73, 7.3 and 48 to 18, 1.8 and 9 g C m−2 year−1 between the southern and the northern part of the Barents Sea respectively. The annual estimates of particulate carbon flux were much higher in 1983 compared to 1981–1982, especially in the north where up to 6 times higher rates were calculated for 1983. The number of zooplankton species present in spring in the southern Barents Sea is governed by over-wintering success, but probably also influenced by advection of Atlantic water. The model was run for Atlantic water with 10,000, 3,000 or none copepods per m2 present in March, indicating that sedimentation can vary between 38 and 61 g C m−2 year−1 due to zooplankton grazing alone. This suggests that the supply of organic carbon to the aphotic zone of the Barents Sea is only partly determined by the strength and duration of phytoplankton blooms, but strongly influenced by zooplankton dynamics.