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首页> 外文期刊>Estuarine Coastal and Shelf Science >Variability in upwelling along the Pacific shelf of Panama and implications for the distribution of nutrients and chlorophyll
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Variability in upwelling along the Pacific shelf of Panama and implications for the distribution of nutrients and chlorophyll

机译：巴拿马太平洋陆架上升流的变化及其对养分和叶绿素分布的影响

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摘要

Seasonal dynamics of dissolved inorganic nutrients (NO_3~-, PO_4~(3-), and Si(OH)_4) and chlorophyll a were investigated in the Pacific shelf of Panama. The shelf is divided into two large semi-open areas, namely the non-upwelling Gulf of Chiriqui and the upwelling Gulf of Panama. Four research cruises sampled the water column in cross-shelf transects during wet and dry seasons at each region. Hydrological measures varied spatially between regions and also varied temporally on a seasonal basis. Low concentrations of NO_3~- (<0.50 μM), PO_4~(3-) (< 0. 27 μM), and chlorophyll a (<0.34 mg m~(-3)) were typical near the surface in the Gulf of Chiriqui during both rainy and dry seasons, but in the Gulf of Panama nutrients and chlorophyll were low only during the rainy season. In contrast, during the dry season upwelling in the Gulf of Panama, high concentrations of NO_3~- (15 μM) and PO_4~(3-) (1.2 μM) in the upper layer caused surface chlorophyll a to peak (1.5 mg m~(-3)). Median Si(OH)_4 concentrations in the upper layer ranged from about 4 uM in both regions during the rainy season to nearly 12 μM in the Gulf of Panama during the dry season upwelling. Both the N:P and N:Si molar ratios suggest that phytoplankton is N-limited except in the Gulf of Panama during upwelling. In both regions, a subsurface chlorophyll maximum (>0.5 mg m~(-3)) typically developed close to the usually shallow thermocline during non-upwelling conditions. We found no evidence of significant nutrient input from freshwater runoff. The position of the thermocline is considered to be the main source of nutrients to the euphotic zone in both regions.
机译：在巴拿马太平洋陆架上调查了溶解的无机养分（NO_3〜-，PO_4〜（3-）和Si（OH）_4）和叶绿素a的季节动态。架子分为两个大的半开放区域，即非上升流的奇里基湾和上升流的巴拿马湾。在每个地区的干燥和潮湿季节，四次研究巡洋舰在横架样带中对水柱进行了采样。水文测度在区域之间空间上变化，并且在季节上也随时间变化。在奇里基湾的海面附近典型地低浓度的NO_3〜-（<0.50μM），PO_4〜（3-）（<0. 27μM）和叶绿素a（<0.34 mg m〜（-3））在雨季和旱季，但在巴拿马湾，养分和叶绿素只有在雨季时才低。相反，在巴拿马湾的干旱季节上升期间，上层的高浓度NO_3〜-（15μM）和PO_4〜（3-）（1.2μM）导致表面叶绿素a达到峰值（1.5 mg m〜 （-3））。上层中层中的Si（OH）_4浓度范围从雨季两个地区的约4 uM到旱季上升期间的巴拿马湾的近12μM。 N：P和N：Si摩尔比均表明浮游植物是N受限的，除了在上升期间在巴拿马湾以外。在这两个区域中，在非上升条件下，地下叶绿素最大值（> 0.5 mg m〜（-3））通常靠近通常较浅的温跃层。我们没有发现淡水径流中大量营养输入的证据。高温跃迁的位置被认为是两个区域富营养区营养的主要来源。

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