 Between 2010 and 2015, five austral springs, sea ice thickness was in growth phase for most days, but can be disturbed by synoptic processes. Surface temperature largely determines the occurrence of ice melting. Downward and upward longwave radiation show synoptic oscillations with a five to eight day period and intracesional variability with a 12 to 45 day period, and the amplitudes of the diurnal. Synoptic and intracesional variability show some differences during the five austral springs considered here. This article was offered by Lijian Yu, Qinghua Yang, Mingyu Zhu, and others.