New production in the South China Sea - A coupled Ra-228-nitrate approach

作者：Cai PH^*; Huang YP; Chen M; Liu GS; Qiu YS

来源：Science in China - Series D: Earth Sciences , 2002, 45(2): 103-109.

DOI：10.1007/BF02879787

• South China Sea
• new production
• Ra-228
• NO3--N
• euphotic zone

Measurement of Ra-228 activities in the upper 300 m water column was conducted at two stations in the South China Sea using an MnO2-fiber extraction/beta-counting technique of Ac-228. Results showed that 228Ra activities ranged from 0.38 to 3.60 Bq . m(-3). The vertical profiles of Ra-223 at the time-series station favored a steady state assumption. Based on a one-dimensional steady state model, Ra-228-nitrate coupled approach was applied to stations NS97-43, NS99-53 (T-1), NS99-53 (T-2). New production thus quantified were 4.4, 5.1 and 5.7 mmolC . m(-2) . d(-1), respectively. f ratios in the South China Sea were estimated from the derived new production and the documented primary productivity in the regime, to be 0.12-0.15.

• 出版日期2002-2
• 单位厦门大学