Observations of sea-ice conditions in the Antarctic coastal region using ship-board video cameras

• Main Authors: Haruhito Shimoda, Tatsuo Endoh, Ken'ichiro Muramoto, Nobuo Ono, Takatoshi Takizawa, Shuki Ushio, Toshiyuki Kawamura, Kay I. Ohshima
• Format: Article in Journal/Newspaper
• Language: English; Japanese
• Published: National Institute of Polar Research 1997
• Subjects: Geography (General); G1-922; Antarctic; The Antarctic; Syowa Station; Prince Olav Coast; Breid Bay; Antarc*; Sea ice
• Online Access: https://doi.org/10.15094/00008982; https://doaj.org/article/6de457029feb4b0dac887403515332b5

During the 30th, 31st, and 32nd Japanese Antarctic Research Expeditions (JARE-30,JARE-31,and JARE-32), sea-ice conditions were recorded by video camera on board the SHIRASE. Then, the sea-ice images were used to estimate compactness and thickness quantitatively. Analyzed legs are those toward Breid Bay and from Breid Bay to Syowa Station during JARE-30 and JARE-31,and those toward the Prince Olav Coast, from the Prince Olav Coast to Breid Bay, and from Breid Bay to Syowa Station during JARE-32. The results show yearly variations of ice compactness and thickness, latitudinal variations of thickness, and differences in thickness histograms between JARE-30 and JARE-32 in Lutzow-Holm Bay. Albedo values were measured simultaneously by a shortwave radiometer. These values are proportional to those of ice compactness. Finally, we examined the relationship between ice compactness and vertical gradient of air temperature above sea ice.