Variations of oceanic pCO_2 and air-sea CO_2 flux in the eastern Indian sector of the Southern Ocean for the austral summer of 2001-2002

摘要

We examined pCO_2~(air)and pCO_2~(sea) observed in the eastern Indian sector of the Southern Ocean (south of 50°S,140° -150°E) during austral spring-summer from November 2001 to March 2002 using 4 research vessels. pCO_2~(sea) changed by as much as 20 μatm over the 5-month period in the Seasonal Sea Ice Zone (SSIZ), due mostly to very low values in January caused by stratification of water column and strong biological activity. In the SSIZ, the air-sea CO_2 flux showed large temporal variations, from -2.9 gm~(-2) month~(-1) in January 2002 to -0.65 gm~(-2) month~(-1) in February 2002. The monthly oceanic CO_ 2 uptake in thearea covered by this study (1.5 x 10~(12) km~2) was emstimated to be in a range of 1.0 x 10~(-3) PgC month~(-1), with a mean value of 1.3 x 10~(-3) PgC month~(-1).