The depletion of nutrients and the estimation of the new production in the ice-edge of the Prydz Bay, Antarctica

摘要

The distributions and changes of nutrients in the Prydz bay were investigat- ed during CHINARE-6 (the 6th Chinese National Antarctic Research Expedition) and CHINARE-9, and the new productions wee estimated by using mass balance method. The results showed that in CHINARE-6, the depletion NO_3-N, PO_4-P_9, SiO-3-Si were 1064. 8, 69.2, 2196 mmol/m~2, respectively, the uptake ratios of N and Si to P were 15.3, 31.7, respectively, and new production was 992.4 mgC/(m~2·d); in CHINARE-9, the depletion of NO_3-N, PO_4-P were 551.9, 41.2 mmol/m~2, respec- Tively, the uptake ratio of N to P was 13.4, and the new production was 390.1 MgC/(m~2·d), indicating significant annual and/or seasonal variation.