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首页> 外文期刊>Journal of oceanography >Interdecadal Variation of the Transition Zone Chlorophyll Front: A Physical-Biological Model Simulation between 1960 and 1990
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Interdecadal Variation of the Transition Zone Chlorophyll Front: A Physical-Biological Model Simulation between 1960 and 1990

机译：过渡带叶绿素前沿的年代际变化：1960年至1990年的物理-生物学模型模拟

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摘要

The interdecadal climate variability affects marine ecosystems in both the subtropical and subarctic gyres, consequently the position of the Transition Zone Chlorophyll Front (TZCF). A three-dimensional physical-biological model has been used to study interdecadal variation of the TZCF using a retrospective analysis of a 30-year (1960–1990) model simulation. The physical-biological model is forced with the monthly mean heat flux and surface wind stress from the COADS. The modeled winter mixed layer depth (MLD) shows the largest increase between 30°N and 40°N in the central North Pacific, with a value of 40–60% higher during 1979–90 relative to 1964–75 values. The winter Ekman pumping velocity difference between 1979–90 and 1964–75 shows the largest increase located between 30°N and 45°N in the central and eastern North Pacific. The modeled winter surface nitrate difference between 1979–90 and 1964–75 shows increase in the latitudinal band between 30°N and 45°N from the west to the east (135°E–135°W), the modeled nitrate concentration is about 10 to 50% higher during the period of 1979–90 relative to 1964–75 values depending upon locations. The increase in the winter surface nitrate concentration during 1979-90 is caused by a combination of the winter MLD increase and the winter Ekman pumping enhancement. The modeled nitrate concentration increase after 1976–77 enhances primary productivity in the central North Pacific. Enhanced primary productivity after the 1976–77 climatic shift contributes higher phytoplankton biomass and therefore elevates chlorophyll level in the central North Pacific. Increase in the modeled chlorophyll expand the chlorophyll transitional zone and push the TZCF equatorward.
机译：年代际气候变化影响着亚热带和亚北极回流中的海洋生态系统，因此影响了过渡带叶绿素前沿（TZCF）的位置。通过对30年（1960年至1990年）模型仿真的回顾性分析，已使用三维物理生物学模型研究TZCF的年代际变化。物理生物学模型被强制使用COADS的每月平均热通量和表面风应力。建模的冬季混合层深度（MLD）显示，北太平洋中部30°N至40°N之间的增幅最大，1979-90年期间的值比1964-75年的值高40-60％。 1979–90年与1964–75年之间的冬季埃克曼抽水速度差异显示，北太平洋中部和东部最大的增幅位于30°N至45°N之间。 1979-90年与1964-75年之间的冬季表面硝酸盐差异模型显示，西向东（135°E-135°W）之间的纬度带在30°N和45°N之间增加，模拟的硝酸盐浓度约为取决于位置，1979-90年期间的值相对于1964-75年增加了10％至5​​0％。冬季MLD的增加和冬季Ekman抽水的增强共同导致了1979-90年冬季表面硝酸盐浓度的增加。 1976-77年后模拟的硝酸盐浓度增加提高了北太平洋中部的初级生产力。 1976-77年气候变化后初级生产力的提高导致浮游植物的生物量增加，从而提高了北太平洋中部的叶绿素水平。建模叶绿素的增加会扩展叶绿素过渡区并推动TZCF赤道。

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