资源环境科技发展态势分析平台

This study analyzes marine heatwaves (MHWs) in the Arctic for its variation in multi‐year‐ice (MYI), first‐year‐ice (FYI) and open‐water areas. Results show that there is a significant annual growth in MHW frequency, duration and intensity in the FYI region, especially for intensity. Since 2005, MHW in FYI increases remarkably in summer and the extent of the affected area continues to grow northward. Particularly, severe MHW events mainly occur in the area where sea ice concentration ranges between 0.1 and 0.5. Stratification in the FYI area impedes the deep mixing and downward transmission of energy from solar radiation, resulting in an anomalously high sea surface temperature in the FYI area. The implication is that MHW will keep growing as the extent of FYI in the Arctic increases.