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Spatiotemporal Distribution Characteristics of Sea Ice in the Bohai Sea in Winter 2012/13 Based on MODIS Data

Author(s): Yu Yan; Wei Gu; Dongdong Shao; Ning Li

Linked Author(s): Dongdong Shao

Keywords: No Keywords

Abstract: To estimate the spatiotemporal distribution characteristics of sea ice in the Bohai Sea during winter 2012-2013, we determined the sea ice coverage and thickness data using time-series EOS MODIS remote-sensing images. Sea ice coverage was obtained using ENVI feature extraction method and the thickness was estimated using a model based on an exponential relation between albedo and thickness of sea ice with 15 imageries of EOS MODIS L1B. The results indicate that sea ice grew with a trend from south to north: first appeared in Liaodong Bay, then graduallysouthwards concentrated on Bohai Bay, and finally grew in Laizhou Bay. The sea ice coverage varied from 1.96% to 30.20% of the whole Bohai Sea, and it soared to 22,631 km on January 17, covering 30.20% of the Bohai Sea. The sea ice coverage exhibited converse evolution phenomenon with the average air temperature on 3 days before, suggesting that an obvious 3-daylag effect existed. The estimated thickness results are in accordance with the results using the Lebedev and Zubov empirical models (R = 0.81 and 0.80), indicating that the proposed retrievedmethod are applicable and reliable. The average sea ice thickness of the whole Bohai Sea ranged from 5.69 to 23.75 cm with a maximum from 12 to 65 cm. In late January to middle February, the average sea ice thickness reached a maximum of about 20 cm. Generally, the spatial characteristic of the sea ice thickness was uneven with the following order: Liaodong Bay> Bohai Bay > Laizhou Bay. CFDD calculated from surrounding coastal cities showed close correlation with the sum of daily sea ice coverage (R =0.93) and thickness (R =0.90) in theBohai Sea, suggesting CFDD as one of the significant controlling factors. The CFDD can be used as an index concerning the trend in evolution of sea ice coverage and sea ice.


Year: 2016

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