当前位置: X-MOL 学术Prog. Oceanogr. › 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.)
Air-sea interaction processes during hurricane Sandy: Coupled WRF-FVCOM model simulations
Progress in Oceanography ( IF 4.1 ) Pub Date : 2022-07-09 , DOI: 10.1016/j.pocean.2022.102855
Siqi Li , Changsheng Chen

A fully-coupled atmospheric-ocean model was developed by coupling WRF (Weather Research and Forecasting Model) with FVCOM (the unstructured-grid, Finite-Volume Community Ocean Model) through the Earth System Model Framework (ESMF). The coupled WRF-FVCOM is configured with either hydrostatic or non-hydrostatic oceanic dynamics and can run with wave-current interactions. We applied this model to simulate the 2012 Hurricane Sandy in the western Atlantic Ocean. The experiments examined the impact of air-sea interactions on Sandy’s intensity/path and oceanic responses under hydrostatic and non-hydrostatic conditions. The results showed that the increased storm wind rapidly deepened the mixed layer depth when ocean processes were included. Intense vertical mixing brought cold water in the deep ocean towards the surface, producing a cold wake within the maximum wind zone underneath the storm. This process led to a sizeable latent heat loss from the ocean within the storm, and hence rapid air temperature and vapor mixing ratio drop above the sea surface. The storm intensified as the central sea-level pressure dropped. Improving air pressure simulation with ocean processes tended to reduce the storm size and strengthen its intensity, providing a better simulation of hurricane path and landfall. Turning on the non-hydrostatic process slightly improved the hurricane central sea-level pressure simulation and intensified the winds on the right side of the hurricane center. Hydrostatic and non-hydrostatic coupled WRF-FVCOMs captured Sandy-induced rapidly-varying flow over the shelf and the wind-induced surge level at the coast. The coupled models predicted a higher water elevation around the coastal areas where Sandy made landfall than the uncoupled model. The uncoupled and coupled models both showed more significant oceanic responses on the right side of the hurricane center, with a maximum during the Sandy crossing period when the clockwise-rotating frequency of Sandy wind was close to the local inertial frequency. The area with a maximum response varied with Sandy’s translation speed, more prominent in the deep region than over the slope, and more substantial under the non-hydrostatic condition. The simulated ocean responses agreed with the theoretical work of Price (1981). The nonhydrostatic experiments suggest that to resolve a fully storm-induced convection process, the oceanic model grid configuration should meet the O(1) criterion for the ratio of local water depth to the model horizontal resolution.



中文翻译:

飓风桑迪期间的海气相互作用过程:耦合 WRF-FVCOM 模型模拟

通过地球系统模型框架 (ESMF) 将 WRF(天气研究和预报模型)与 FVCOM(非结构化网格、有限体积社区海洋模型)耦合,开发了一个完全耦合的大气-海洋模型。耦合的 WRF-FVCOM 配置有静水或非静水海洋动力学,并且可以与波流相互作用运行。我们应用这个模型来模拟 2012 年西大西洋的飓风桑迪。实验检查了海气相互作用对桑迪的强度/路径和静水和非静水条件下的海洋响应的影响。结果表明,当包括海洋过程时,增加的风暴风迅速加深了混合层深度。强烈的垂直混合将深海中的冷水带到海面,在风暴下方的最大风区内产生冷尾流。这一过程导致风暴中海洋的大量潜热损失,因此海面上方的气温和蒸汽混合比迅速下降。随着中央海平面气压下降,风暴愈演愈烈。通过海洋过程改进气压模拟往往会减小风暴规模并加强其强度,从而更好地模拟飓风路径和登陆。开启非静水过程略微改善了飓风中心海平面压力模拟,并加强了飓风中心右侧的风速。静水和非静水耦合的 WRF-FVCOM 捕获了桑迪引起的陆架上快速变化的流量和海岸风引起的浪涌水平。耦合模型预测桑迪登陆的沿海地区周围的水位高于非耦合模型。非耦合和耦合模式均在飓风中心右侧显示出更显着的海洋响应,在沙地风顺时针旋转频率接近当地惯性频率的沙地穿越期间达到最大值。响应最大的区域随着桑迪平移速度的变化而变化,在深部区域比在斜坡上更突出,在非静水条件下更为显着。模拟的海洋反应与 Price (1981) 的理论工作一致。非流体静力实验表明,要解决完全风暴引起的对流过程,海洋模型网格配置应满足 非耦合和耦合模式均在飓风中心右侧显示出更显着的海洋响应,在沙地风顺时针旋转频率接近当地惯性频率的沙地穿越期间达到最大值。响应最大的区域随着桑迪平移速度的变化而变化,在深部区域比在斜坡上更突出,在非静水条件下更为显着。模拟的海洋反应与 Price (1981) 的理论工作一致。非流体静力实验表明,要解决完全风暴引起的对流过程,海洋模型网格配置应满足 非耦合和耦合模式均在飓风中心右侧显示出更显着的海洋响应,在沙地风顺时针旋转频率接近当地惯性频率的沙地穿越期间达到最大值。响应最大的区域随着桑迪平移速度的变化而变化,在深部区域比在斜坡上更突出,在非静水条件下更为显着。模拟的海洋反应与 Price (1981) 的理论工作一致。非流体静力实验表明,要解决完全风暴引起的对流过程,海洋模型网格配置应满足 在沙地风顺时针旋转频率接近局地惯性频率时,沙地穿越期间最大。响应最大的区域随着桑迪平移速度的变化而变化,在深部区域比在斜坡上更突出,在非静水条件下更为显着。模拟的海洋反应与 Price (1981) 的理论工作一致。非流体静力实验表明,要解决完全风暴引起的对流过程,海洋模型网格配置应满足 在沙地风顺时针旋转频率接近局地惯性频率时,沙地穿越期间最大。响应最大的区域随着桑迪平移速度的变化而变化,在深部区域比在斜坡上更突出,在非静水条件下更为显着。模拟的海洋反应与 Price (1981) 的理论工作一致。非流体静力实验表明,要解决完全风暴引起的对流过程,海洋模型网格配置应满足O (1) 局部水深与模型水平分辨率之比的判据。

更新日期:2022-07-09
down
wechat
bug