南极普里兹湾碳循环研究进展

普里兹湾是南大洋碳循环研究典型代表海区，也是中国历次南大洋考察的重点调查区域。从初级生产力、营养盐、叶绿素、海-气CO₂通量、真光层颗粒有机碳（POC）输出通量，净群落生产力（NCP）等方面综合阐述了其碳循环特征。生物泵运转效率和海冰过程是碳吸收的主要控制因素。普里兹湾总体上可以从陆坡划界，分为湾内和湾外两大部分。两者碳循环特征差异显著。湾内碳循环过程活跃，是南大洋夏季的高生产力区域。湾外则表现出高营养盐、低叶绿素（HNLC）特征，初步认为存在Fe限制。总体上，溶解有机碳（DOC）、POC、营养盐、叶绿素、二氧化碳分压（pCO₂）等存在从湾内向湾外随纬度递增或递减的规律。海冰消长对碳循环过程影响剧烈。夏季融冰造成的冰藻释放、水体垂直稳定性增加是提高生物生产力的首要原因。总体上普里兹湾的碳循环受各种生物、物理过程及其耦合作用控制，对南大洋碳循环机制研究有重要意义。

ADVANCES IN CARBON-CYCLE RESEARCH FOR PRYDZ BAY,THE ANTARCTICA

Prydz Bay is a typical area of ocean carbon research in the Sourthern Ocean. It is also a key research area in Chinese National Antarctic Research Expedition (CHINARE). We comprehensively expounded the carbon cycle characteristics in the Prydz Bay by primary productivity, nutrient, chlorophyll, air - sea CO₂ flux, particle organic carbon (POC) export flux from the euphotic zone and net community productivity (NCP). The efficiency of the biological pump and the sea ice processes are the main influence factors of the carbon uptaking of Prydz Bay. Generally, awarding to the carbon cycle parameters, the Prydz Bay could be divided into the inside and outside regions and the carbon cycling characteristics are obvious diverse.The inside area is a high productivity area in the Southern Ocean, in which the carbon cycle processes are active. However, the outside area shows a high nutrient, low chlorophyll (HNLC) characteristics, which may be caused by the iron limited. In general, all parameters including dissolved organic carbon (DOC), POC, nutrient, chlorophyll-a (chl-a)and CO₂ partial pressure (pCO₂) shows a general increasing or decreasing distributions with latitude variation. The carbon cycle mainly seriously affected by the advance and retreat of the sea ice. In the summer, the increasing biological productivity in the surfaceprimary resulted from the ice alage released and the stability of water column enhanced after the ice retreated. Overall, the carbon cycle of the Prydz Bay commonly controlled by the biological physical processes and their coupling effect, which has important implications for the carbon cycle mechanism research in the southern ocean.