Mechanisms for nutrient delivery to the inner shelf: Observations from the Santa Barbara Channel
Mechanisms for nutrient delivery to the inner shelf: Observations from the Santa Barbara Channel
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营养物质输送到内架的机制：来自圣巴巴拉海峡的观察
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Melack
中科院分区：
文献类型：
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作者：
E. McPhee‐Shaw;D. Siegel;L. Washburn;M. Brzezinski;Janice L. Jones;A. Leydecker;J. Melack
海洋营养源的海带森林的圣巴巴拉通道进行了诊断使用时间序列从三个系泊在12至17米的水深。系泊设备上的原位硝酸盐自动分析仪提供了该环境下硝酸盐+亚硝酸盐（溶解无机氮，DIN）浓度的第一个高分辨率时间序列。2001年2月和2003年5月之间的测量表明，主要机制，供应DIN的内架的圣巴巴拉通道的上升流，昼夜内部运动，和风暴径流。这些供应机制的重要性随季节而变化。上升流占主导地位的3月和5月之间的内架DIN浓度的增加，并占超过一半的年度平流DIN运输到陆架珊瑚礁。在夏季，类似于内波的斜压运动是DIN的一个重要来源，因为它们发生在表面营养盐浓度耗尽和其他供应机制不活跃的时候。在晚秋和初冬，短暂的上升流变得很重要。DIN输入暴雨径流，检测到的盐度稀释系泊和估计从测量流流量和营养盐浓度，是显着的冬季径流事件。
Oceanic sources of nutrients to the kelp forests of the Santa Barbara Channel were diagnosed using time series from three moorings in 12‐ to 17‐m water depth. An in situ nitrate autoanalyzer on the moorings provided the first high‐resolution time series of nitrate + nitrite (dissolved inorganic nitrogen, DIN) concentrations for this environment. Measurements between February 2001 and May 2003 show that the major mechanisms that supply DIN to the inner shelf of the Santa Barbara Channel are upwelling, diurnal internal motions, and storm runoff. These supply mechanisms vary in importance seasonally. Upwelling dominates increases of inner‐shelf DIN concentration between March and May and accounts for more than half of the annual advective DIN transport to shelf reefs. In summer, baroclinic motions akin to internal waves are an important source of DIN because they occur when surface nutrient concentrations are depleted and other supply mechanisms are inactive. Brief episodes of upwelling become important in late autumn and early winter. DIN inputs from storm runoff, detected as salinity dilution at the moorings and estimated from measurements of stream discharge and nutrient concentration, are significant during winter runoff events.