Exploration of anomalous low sea ice concentration phenomenon in the Central Arctic

Li Cheng; Su Jie; Wei Lixin; Liang Hongjie; Huang Fei; Zhao Jinping

doi:10.3969/j.issn.0253-4193.2018.11.004

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Li Cheng, Su Jie, Wei Lixin, Liang Hongjie, Huang Fei, Zhao Jinping. Exploration of anomalous low sea ice concentration phenomenon in the Central Arctic[J]. Haiyang Xuebao, 2018, 40(11): 33-45. doi: 10.3969/j.issn.0253-4193.2018.11.004

Citation:

Li Cheng, Su Jie, Wei Lixin, Liang Hongjie, Huang Fei, Zhao Jinping. Exploration of anomalous low sea ice concentration phenomenon in the Central Arctic[J]. Haiyang Xuebao, 2018, 40(11): 33-45. doi: 10.3969/j.issn.0253-4193.2018.11.004

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Exploration of anomalous low sea ice concentration phenomenon in the Central Arctic

doi: 10.3969/j.issn.0253-4193.2018.11.004

1.
Key Laboratory of Physical Oceanography, Ministry of Education,Ocean University of China,Qingdao 266100, China;Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China
2.
Key Laboratory of Physical Oceanography, Ministry of Education,Ocean University of China,Qingdao 266100, China
3.
Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, State Oceanic Administration, Beijing 100081, China

Received Date: 2017-10-20
Rev Recd Date: 2018-05-10

Abstract

Abstract

In recent years, there emerges a phenomenon that Central Arctic should experience anomalous low sea ice concentration. To analyze explicitly the causes, the Low Concentration in Central Arctic (LCCA) index is defined by using the ERA-Interim reanalysis data. Within the period of June to September from 2009 to 2016, there were 6 cases recognized as the peaks of LCCA index. The results show that the leading factor of low sea ice concentration is not the local thermal condition. Dynamically, the drifting pattern of sea ice and the location of region with low sea ice concentration response consistently to the atmospheric circulation. Particularly, cyclones used to be found north of 70°N before the 6 peaks of LCCA index occurred. These cyclones moved towards north with hot air from lower latitudes causing divergence and rapid melting of sea ice. In 3 cases of 6, cyclones were accompanied with Dipole Anomaly (DA) pattern. LCCA index correlates positively with northward heat advection across the circle of 84°N as well as the divergence of Central Arctic sea ice. Before the LCCA peak days, the northward heat advection has greater effects on sea ice than the dynamic divergence.
- low sea ice concentration,
- Central Arctic,
- sea ice,
- cyclone

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