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首页> 外文期刊>Journal of oceanography >Enhancement of biological productivity by internal waves: observations in the summertime in the northern South China Sea
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Enhancement of biological productivity by internal waves: observations in the summertime in the northern South China Sea

机译：内部波浪增强生物生产力：南海北部夏季的观测

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Streaks of elevated concentrations of surface chlorophyll a (Chl_a) of various spacing were found to be associated with internal waves in their transmission zone and dissipation zone in the summertime in the deep open northern South China Sea. At an anchored station in the dissipation zone north of the Dongsha Atoll with a water depth of ca. 600?m, undulations of the mixed layer depth with an amplitude of ca. 30?m and a periodicity of ca. 12?h were observed, and they were accompanied by similar undulation in the isotherm and isopleth of the nutrients. These observations are consistent with the enhancement of vertical mixing by internal waves and the resulting transfer of cold, nutrient-rich subsurface water to the surface mixed layer to fuel biological productivity. In the transmission zone and dissipation zone, respectively, the summertime (May–October) average sea surface temperature was 0.5 and 0.8?°C lower and Chl_a was 19 and 43?% higher than those in a nearby subregion that was minimally affected by internal waves. The mean net primary productivity was elevated by 15 and 37?%. These results indicate that the enhancement of biological activity by internal waves is not confined to the shallow waters on the shelf. The effect can be detected in all phases of the internal waves although it may be especially prominent in the dissipation zone where mixing between subsurface and surface waters is more effective.
机译：在南海深部开放的夏季，发现各种间距的表面叶绿素a（Chl_a）浓度升高的条纹与它们的传播区和耗散区的内波有关。在东沙环礁以北消散区的一个锚固站，水深为600？m，混合层深度起伏，幅度约。 30？m，周期约为观察到12？h，它们在等温线和等量养分中伴随着类似的起伏。这些观察结果与内部波增强垂直混合以及将冷的，营养丰富的地下水转移到表面混合层以提高生物生产力相一致。在传输区和耗散区，夏季（5月至10月）的平均海面温度分别比受次要区域影响最小的附近分区低0.5和0.8？°C，Chl_a高出19和43％。波浪。平均净初级生产力提高了15％和37％。这些结果表明，内部波对生物活性的增强并不局限于架子上的浅水域。尽管可能在消散区特别明显，消散区在地下波与地表水之间的混合更为有效，但在内部波的所有阶段都可以检测到这种影响。

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