复旦大学郭媛媛团队研究了南太平洋辐合带对南极西部秋季海冰变化的影响。2025年3月26日出版的《大气科学进展》杂志发表了这项成果。

作为南半球最强的对流带之一，南太平洋辐合带（SPCZ）对大气环流和南极气候的变化产生了重大影响。研究组揭示了南半球秋季SPCZ的强度可以改变阿蒙森海冰，这与厄尔尼诺-南方涛动（ENSO）显著无关。观测和数值结果表明，比通常更强的SPCZ可以产生沿大圆路线向极地传播的Rossby波列，并在南极洲西部附近引起阿蒙森海低压（ASL）的减少，这可能在一定程度上抵消了ENSO施加的遥相关。

ASL强度和纬向范围的这些明显变化强烈地导致了罗斯海、阿蒙森海和威德尔海海冰扰动的三极响应。研究组发现，风驱动的动力学过程决定了局部海冰的变化，而热力学过程则微不足道。这项研究强调，为了全面了解南极洲西部海冰在年际时间尺度上的变化，有必要考虑南极太平洋控制区的变化。

附：英文原文

Title: South Pacific Convergence Zone Impacts on the Autumn Sea Ice Changes in West Antarctica

Author: Yingjie HOU, Yuanyuan GUO, Ruijie ZHANG

Issue&Volume: 2025-03-26

Abstract: As one of the strongest convection bands in the Southern Hemisphere, the South Pacific Convergence Zone (SPCZ) exerts substantial influences on variabilities in the atmospheric circulation and Antarctic climate. In this study, it is revealed that the intensity of SPCZ can change the Amundsen Sea sea ice during the austral autumn, which is significantly independent of the El Nio-Southern Oscillation (ENSO). Observational and numerical results suggest that the stronger-than-usual SPCZ can generate a poleward-propagating Rossby wave train along a great circle route and induce a reduced Amundsen Sea Low (ASL) near West Antarctica, which may somewhat offset the teleconnections exerted by ENSO. These noticeable changes in the strength and zonal extent of ASL robustly lead to a tripole response of sea-ice perturbations in the Ross, Amundsen, and Weddell Seas. We find that the wind-driven dynamical process determines the local sea-ice changes, while the thermodynamical process is trivial. This research underscores the need to consider the SPCZ variability for a comprehensive understanding of sea-ice changes in West Antarctica on the interannual time scale.

DOI: 10.1007/s00376-025-4397-6

Source: http://www.iapjournals.ac.cn/aas/article/doi/10.1007/s00376-025-4397-6