LAUSR

Recent studies demonstrate that the Antarctic Ozone Hole has important influences on Antarctic sea ice. While most of these works have focused on effects associated with atmospheric and oceanic dynamic processes caused by stratospheric ozone changes, here we show that stratospheric ozone-induced cloud radiative effects also play important roles in causing changes in Antarctic sea ice. Our simulations demonstrate that the recovery of the Antarctic Ozone Hole causes decreases in clouds over Southern Hemisphere (SH) high latitudes and increases in clouds over the SH extratropics. The decrease in clouds leads to a reduction in downward infrared radiation, especially in austral autumn. This results in cooling of the Southern Ocean surface and increasing Antarctic sea ice. Surface cooling also involves ice-albedo feedback. Increasing sea ice reflects solar radiation and causes further cooling and more increases in Antarctic sea ice. 最新的研究表明南极臭氧洞对南极海冰有着重要的影响。其中大多数研究主要关注平流层臭氧变化通过大气和海洋动力过程对海冰的影响,而我们的研究发现平流层臭氧变化导致的云的辐射效应在南极海冰变化中也起了重要作用。我们的模拟结果表明南极臭氧洞恢复导致南半球高纬度云减少以及南半球中纬度云增加。云的减少进一步导致向下的红外辐射减少,这一过程主要发生在南半球秋季。这也导致了南大洋表面变冷以及南极海冰的增加。海表面变冷同时也伴随着海冰—反照率反馈过程。海冰的增加反射太阳辐射,这将导致进一步变冷和南极海冰的进一步增加。