当前位置: X-MOL 学术Ocean Model. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fast-changing upwelling off the west coast of Hainan Island
Ocean Modelling ( IF 3.2 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.ocemod.2020.101589
Peng Bai , Zheng Ling , Shuwen Zhang , Lingling Xie , Jingling Yang

Abstract In this study, we investigated the short-term dynamics of upwelling off the west coast of Hainan Island (UWH) by combining Moderate Resolution Imaging Spectroradiometer (MODIS) infrared sea surface temperature (SST) images and Regional Ocean Modeling System (ROMS) simulations. MODIS observations showed that the UWH could exhibit rapid temporal variations, where the SST could increase or decrease by more than 1 °C within 3 h. Further investigations based on ROMS simulations suggested that flood tides could rapidly intensify the UWH, whereas ebb tides could rapidly weaken the UWH. Strong horizontal advection by intense tidal currents and high vertical velocity due to divergence/convergence triggered by progressive tidal waves were identified as the intrinsic physical mechanisms responsible for the rapid SST variations in the UWH. These findings were verified based on a MODIS-observed fast-cooling UWH event and a MODIS-observed fast-warming UWH event. Analyses of the timing of occurrence, tidal phase, and spatial patterns of the significant variations in the SST for these events all agreed with the hypothesis stated above. Model–data fusion analysis indicated that when a neap tide or transition period for tidal currents occurs, the influence of the tidal flow on the UWH is weak because of the associated weak horizontal advection and divergence/convergence.

中文翻译:

海南岛西海岸快速变化的上升流

摘要 在这项研究中,我们结合中分辨率成像光谱仪 (MODIS) 红外海面温度 (SST) 图像和区域海洋建模系统 (ROMS) 模拟,研究了海南岛西海岸 (UWH) 上涌的短期动态。 . MODIS 观测表明,UWH 可以表现出快速的时间变化,其中 SST 可以在 3 小时内增加或减少超过 1°C。基于 ROMS 模拟的进一步调查表明,潮汐可以迅速加强 UWH,而退潮可以迅速削弱 UWH。由强潮汐流引起的强烈水平平流和由渐进潮汐波引发的发散/收敛引起的高垂直速度被确定为导致 UWH 快速 SST 变化的内在物理机制。这些发现基于 MODIS 观测到的快速冷却 UWH 事件和 MODIS 观测到的快速升温 UWH 事件进行了验证。对这些事件的海温显着变化的发生时间、潮汐相位和空间模式的分析都与上述假设一致。模型-数据融合分析表明,当出现小潮或潮汐流过渡期时,由于相关的弱水平平流和发散/收敛,潮汐流对UWH的影响较弱。
更新日期:2020-04-01
down
wechat
bug