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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Upper ocean response of the Mesoamerican Barrier Reef System to Hurricane Mitch and coastal freshwater inputs: A study using Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ocean color data and a nested-grid ocean circulation model
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Upper ocean response of the Mesoamerican Barrier Reef System to Hurricane Mitch and coastal freshwater inputs: A study using Sea-viewing Wide Field-of-view Sensor (SeaWiFS) ocean color data and a nested-grid ocean circulation model

机译：中美洲堡礁系统的上层海洋对米奇飓风和沿海淡水输入的响应：使用海景宽视野传感器（SeaWiFS）海洋颜色数据和嵌套网格海洋环流模型的研究

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The passage of category-5 Hurricane Mitch through the Mesoamerican Barrier Reef System (MBRS) in October 1998 was an extreme event with the potential to create unusual patterns of reef connectivity. The impact of this hurricane on the upper ocean of the MBRS is investigated using a triply nested grid ocean circulation modeling system. The model results are validated with contemporaneous ocean color data from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) satellite and oceanographic measurements in the MBRS. The nested grid system is forced by 6-hourly National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) winds for the first 294 days prior to the arrival of the hurricane in the MBRS, and then by the combination of the NCEP/NCAR wind-forcing and an idealized vortex representative of Mitch for the following 20 days. The system is also forced by the monthly mean sea surface heat and freshwater fluxes and buoyancy forcing associated with major river discharges and storm-induced precipitation in the western Caribbean Sea. The simulated upper ocean circulation during Mitch is characterized by strong and divergent currents under the storm and intense near-inertial currents and sea surface temperature cooling behind the storm. The nested grid system also reproduces the buoyant estuarine plumes extending from the coast off Honduras as inferred from SeaWiFS satellite data and detected in field measurements at Gladden Spit in Belize shortly after the passage of Hurricane Mitch. The present model results suggest that populations of site-attached organisms associated with nearshore and offshore reef features that are dynamically isolated in normal conditions experienced greater potential for ecological connection under Mitch's extreme conditions.
机译：1998年10月，第5类米奇飓风通过中美洲堡礁系统（MBRS）是一次极端事件，有可能创造不同寻常的礁石连通性模式。使用三重嵌套网格海洋环流建模系统研究了飓风对MBRS上层海洋的影响。该模型的结果已通过来自海洋宽视场传感器（SeaWiFS）卫星的实时海洋颜色数据和MBRS中的海洋学测量结果进行了验证。嵌套网格系统是在飓风到达MBRS之前的前294天中，由6小时的国家环境预测中心/国家大气研究中心（NCEP / NCAR）强迫驱风的，在接下来的20天中，NCEP / NCAR强制风和理想的涡流代表了Mitch。该系统还受到西加勒比海主要河流流量和风暴诱发的降水相关的月平均海表热量和淡水通量以及浮力的强迫。米奇期间模拟的上层海洋环流的特征是，风暴下的强流和发散流，风暴后强烈的近惯性流和海表温度冷却。嵌套网格系统还再现了从SeaWiFS卫星数据推断出并在伯利兹Gladden Spit飓风米奇过后不久在野外测量中检测到的，从洪都拉斯海岸延伸的河口羽流。本模型结果表明，在正常条件下动态隔离的与近岸和近海礁石特征相关的与地点相连的生物种群在米奇的极端条件下具有更大的生态联系潜力。

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