Estimates of primary production by ice algae and phytoplankton in the coastal ice-covered area near Syowa Station, Antarctica

• Main Authors: Hiroo Satoh, Kentaro Watanabe, Takao Hoshiai
• Format: Article in Journal/Newspaper
• Language: English; Japanese
• Published: National Institute of Polar Research 1991
• Subjects: Geography (General); G1-922; Syowa Station; Antarc*; Antarctica; E. Antarctica; ice algae; Sea ice
• Online Access: https://doi.org/10.15094/00008709; https://doaj.org/article/2439cb3be6734c89a6fda50af700c91f

Annual primary production of ice algae and phytoplankton under fast ice near Syowa Station (69°00′S, 39°35′E), Antarctica, was estimated. Mean daily production in each month from February 1983 to January 1984 was calculated with a mathematical model based on measured parameters of solar radiation, day length, attenuation coefficients of snow, ice and water, chlorophyll α standing stock, quantum yield for photosynthesis etc. Solar radiation measured at Syowa Station ranged from 0Em^<-2>h^<-1> in June to 13.3Em^<-2>h^<-1> in December. Relative light intensity estimated at the bottom of sea ice during the year ranged from 0 to 6.5% of incident solar radiation, due to attenuation with snow and ice. Maximum daily production of ice algae (34mgCm^<-2>(day)^<-1>) and phytoplankton (450mgCm^<-2>(day)^<-1>) was reached in December and in February, respectively. The estimated annual production of ice algae and phytoplankton was 3.5 and 17gCm^<-2>, respectively. These results indicate that summer phytoplankton production contributed remarkably to the primary production in the coastal ice-covered area near Syowa Station.