利用卫星数据估算南大洋海-气CO_2通量的展望

IMPLICATIONS FOR ESTIMATING AIR-SEA CO_2 FLUXES IN THE SOUTHERN OCEAN BASED ON SATELLITE DATA AND IN SITU INVESTIGATIONS

本文简述了南大洋在全球碳循环系统中的重要作用以及极地海域海洋CO2通量现场实测数据调查的局限性和存在问题,借鉴国外学者在大洋利用卫星数据估算海-气CO2通量的研究成果,结合我国在南极积累的二十多年的大洋考察资料,展望我国在南大洋进行相关碳通量估算的研究前景。总的基本思路是:从海表层水CO2分压和其相应的调控因子之间推导出经验公式,通过最佳的插值方式由卫星遥感数据外推整个计算海域的CO2数据场,与实测数据做比较,计算碳通量。

This paper summarizes the importance of air-sea CO2 fluxes assessment in the Southern Ocean for understanding of global carbon cycle and the limitation of in situ measurements in polar regions for such purpose. A method is introduced to calculate air-sea CO2 fluxes in the Southern Ocean using satellite data by referring to the previous achievements on the air-sea CO2 fluxes estimation in the open ocean and taking advantage of the data collected during the past twenty years in Chinese National Antarctic Research Expeditions. Air-sea CO2 flux estimates are based on the empirical relationships derived from sea surface CO2 partial pressure （pCO2） and relative controlling factors. And pCO2 fields are then created by optimum interpolations based on satellite data and compared with in situ investigations.