Laboratoire des Sciences de l'Environnement Marin (LEMAR), CNRS/UBO/IRD/IFREMER, Institut Universitaire Européen de la Mer (IUEM), Plouzané, France.
PLoS One. 2013 May 15;8(5):e62281. doi: 10.1371/journal.pone.0062281. Print 2013.
The variability of the California Current System (CCS) is primarily driven by variability in regional wind forcing. In particular, the timing of the spring transition, i.e., the onset of upwelling-favorable winds, varies considerably in the CCS with changes in the North Pacific Gyre Oscillation. Using a coupled physical-biogeochemical model, this study examines the sensitivity of the ecosystem functioning in the CCS to a lead or lag in the spring transition. An early spring transition results in an increased vertical nutrient flux at the coast, with the largest ecosystem consequences, both in relative amplitude and persistence, hundreds of kilometers offshore and at the highest trophic level of the modeled food web. A budget analysis reveals that the propagation of the perturbation offshore and up the food web is driven by remineralization and grazing/predation involving both large and small plankton species.
加利福尼亚海流系统（CCS）的可变性主要受区域风强迫的可变性驱动。特别是，CCS 中春季转变的时间，即上升流有利风的开始，随着北太平洋环流振荡的变化而有很大变化。本研究使用耦合的物理-生物地球化学模型，研究了CCS 中生态系统功能对春季转变提前或滞后的敏感性。春季转变提前会导致沿海地区的垂直营养通量增加，其生态后果在相对幅度和持续时间上，在数百公里的近海和模型食物网的最高营养层次上都是最大的。预算分析表明，近海和食物网向上传播的扰动是由包括大型和小型浮游生物物种在内的再矿化和摄食/捕食驱动的。
