Quesada-Alpízar Marco A, Morales-Ramírez Alvaro
Programa Regional de Posgrado en Biología, Sistema de Estudios de Posgrado, Escuela de Biología, Universidad de Costa Rica, 2060, San José, Costa Rica.
Rev Biol Trop. 2004 Dec;52 Suppl 2:95-103.
Abstract: In order to understand the vertical distribution of planktonic organisms in the oceans, it is important to consider a number of factors. Including oceanic circulation patterns, the vertical structure of the water column and the vertical position of the thermocline. This study examines the hydrography of Golfo Dulce, a tropical fjord -like embayment in the Eastern Tropical Pacific, and the influence of the 1997-1998 ENSO on the system. Five sampling stations were selected and visited once a month for two years in order to obtain vertical profiles of temperature (degrees C), salinity (% per hundred) and dissolved oxygen (mg O2/l). Results show a strong vertical stratification of the water column associated to the morphology of Golfo Dulce's basin and to the effects of ENSO. Moreover, the existence of significant differences between the hydrographic characteristics of the inner and outer parts of the basin was detected. Finally, biannual events in the influx of cold, high salinity, and oxygen rich oceanic water masses into the basin were detected. These events might be related to the same forces driving the coastal upwelling system in the Gulf of Panama.
为了解海洋中浮游生物的垂直分布，考虑多个因素很重要。包括海洋环流模式、水柱的垂直结构以及温跃层的垂直位置。本研究考察了位于东热带太平洋的热带峡湾状海湾杜尔塞湾的水文状况，以及1997 - 1998年厄尔尼诺 - 南方涛动（ENSO）对该系统的影响。在两年时间里，每月对五个采样站进行一次访问，以获取温度（摄氏度）、盐度（千分比）和溶解氧（毫克O₂/升）的垂直剖面。结果表明，水柱存在强烈的垂直分层，这与杜尔塞湾盆地的形态以及ENSO的影响有关。此外，还检测到盆地内部和外部水文特征存在显著差异。最后，检测到冷的、高盐度且富氧的海洋水体每年两次流入盆地的事件。这些事件可能与驱动巴拿马湾沿岸上升流系统的相同力量有关。
