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Ocean-atmosphere interactions and multi-scale climate variability in a changing climate
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Low Sea Ice Concentration in Central Arctic and its Impact Factors
Tuesday 8th @ 1450-1510, Concert Hall
Jie Su* , Ocean university of China
Cheng Li, Ocean university of China
Kexin Song, Ocean university of China
Lixin Wei, National Marine Environmental Forecasting Center
Hongjie Liang, Ocean university of China
Jinping Zhao, Ocean university of China
Presenter Email: sujie@ouc.edu.cn |
| Central Arctic experiences low sea ice concentration (SIC) in recent years. To study on the occurrence of this unusual phenomenon and its impact factors, the Low sea ice Concentration in Central Arctic (LCCA) index is defined by using several SIC data. Although results from each dataset give different index value, the LCCA process is obvious exist after 2010. The analysis results show that the leading factor of low SIC is not the local air temperature. Dynamically, the drifting pattern of sea ice and the location where the low SIC occurred response consistently to the atmospheric circulation. Particularly, cyclones used to be found north of 70N before LCCA index reached peak value. These cyclones moved towards north with warm air from lower latitudes causing sea ice divergence and rapid melting of sea ice. Frequently, cyclones were accompanied with Dipole Anomaly (DA) atmospheric circulation pattern. LCCA index correlates positively with northward heat advection across the circle of 84N as well as the divergence of Central Arctic sea ice. |
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