Zooplankton biomass, advection and production on the northern Gulf of Alaska shelf from simulations and field observations
Zooplankton biomass, advection and production on the northern Gulf of Alaska shelf from simulations and field observations
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DOI：
10.1016/j.jmarsys.2013.04.018
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发表时间：
2013-12-01
影响因子：
2.8
通讯作者：
Hopcroft, R. R.
中科院分区：
文献类型：
--
作者：
Coyle, K. O.;Gibson, G. A.;Hopcroft, R. R.
阿拉斯加湾（果阿）陆架上的动物浮游生物野外观测结果的解释由于海流、涡流和曲流的复杂物理环境而变得复杂，这些环境在不同程度上混合了海洋和沿海水团。因此，我们开发了一个较低的营养级模式嵌入在海洋环流模式，研究风，径流和温度对运输，生物量和生产的微型浮游动物和桡足类的北方果阿陆架和邻近的海洋。在现场测量和模拟中，平均微型浮游动物生物量分别为10-90和10-50 mg C m（-3）。上层100 m桡足类生物量的平均模拟值和实测值约为1-40 g Cm（-3）。野外调查结果表明，5月份新哲水蚤生物量与盐度呈负相关。模拟表明，负相关是由于相对于邻近海洋，大陆架上的初级生产和次级生产增加。浮子编程模拟个体发育的垂直迁移的新哲水蚤表明，类似的10至50%的新哲水蚤起源附近的货架休息至少花了一些时间在货架上，根据位置。漂浮物在陆架上的停留时间主要受风的影响，其次受径流的影响。初级生产力和次级生产力在模拟中高度相关（r > 0.9）。模拟的次级生产量为10-90 g C m（-2）y（-1），在科迪亚克附近和科迪亚克以西的下库克湾最高。(c)2013爱思唯尔有限公司版权所有。
Interpretation of zooplanlcton field observations on the Gulf of Alaska (GOA) shelf is complicated by the complex physical environment of currents, eddies and meanders which mix oceanic and coastal water masses to varying degrees. We therefore developed a lower trophic level model embedded in an ocean circulation model to examine the effects of wind, runoff and temperature on transport, biomass and production of microzooplankton and copepods on the northern GOA shelf and adjacent ocean. Mean microzooplankton biomass varied from 10-90 and 10-50 mg C m(-3) in the upper 50 m for field measurements and simulations respectively. Mean simulated and measured copepod biomass in the upper 100 m was about 1-40 g C m(-3). Field data indicated that Neocalanus biomass was negatively correlated with salinity in May. Simulations indicated that the negative correlation was due to elevated primary and secondary production on the shelf relative to the adjacent ocean. Floats programmed to simulate the ontogenetic vertical migrations of Neocalanus indicated that similar to 10 to 50% of Neocalanus originating near the shelf break spend at least some time on the shelf, depending on location. Residence time of floats on the shelf was affected primarily by wind, secondarily by runoff. Primary and secondary production in the simulations were highly correlated (r > 0.9). Simulated secondary production was 10-90 g C m(-2) y(-1), with highest values in Lower Cook Inlet, around Kodiak and west of Kodiak. (c) 2013 Elsevier B.V. All rights reserved.