Zhu Ruichen, Li Mingkui, Yang Haiyuan, Ma Xin, Chen Zhaohui
Laoshan Laboratory, Qingdao, China.
Frontier Science Center for Deep Ocean Multi-spheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao, China.
Sci Rep. 2024 Oct 24;14(1):25183. doi: 10.1038/s41598-024-76720-3.
Oceanic mesoscale eddies influence air-sea interaction and atmosphere dynamics through ventilating heat and moisture upward. However, whether the sea surface temperature (SST) gradient on the eddy edge could affect the heat and moisture release is still unknown because of the limited observations and coarse-resolution climate models. Using high-resolution atmospheric simulations, this study compares the atmospheric response to the mesoscale (~ 40 km) and submesoscale (~ 4 km) SST gradients at the edge of an eddy. Results show that submesoscale SST gradient drives stronger surface heat and moisture fluxes, enhancing the vertical mixing intensity by 2-3 times within and above the marine atmospheric boundary layer. As a result, one local precipitation event is found to be an order of magnitude larger overlying the eddy. Our findings highlight the importance of resolving oceanic submesoscale features for accurately predicting atmosphere dynamics and precipitation over the ocean.
大洋中尺度涡旋通过向上输送热量和水汽来影响海气相互作用和大气动力学。然而，由于观测有限和气候模型分辨率粗糙，涡旋边缘的海表面温度（SST）梯度是否会影响热量和水汽释放仍不清楚。本研究利用高分辨率大气模拟，比较了大气对涡旋边缘中尺度（约40公里）和亚中尺度（约4公里）SST梯度的响应。结果表明，亚中尺度SST梯度驱动更强的表面热通量和水汽通量，使海洋大气边界层内及上方的垂直混合强度增强2至3倍。结果发现，在涡旋上方有一次局地降水事件比其他地方大一个量级。我们的研究结果突出了解析海洋亚中尺度特征对于准确预测海洋上空大气动力学和降水的重要性。
