摘要：Temperature, salinity, chlorophyll a (Chl- a ), nitrate, and sea-air differences of CO 2 partial pressure (Δ p CO 2 ) were extensively investigated in the northern East China Sea (ECS) during seven research cruises from 2003 to 2009. The Δ p CO 2 showed large intraseasonal variation in the spring and summer. In spring, the areal mean Δ p CO 2 in May 2004 was almost half of that in April 2008, probably associated with differences in sea surface temperature (SST). In summer, the areal mean Δ p CO 2 in August 2003 was also twice as large as that in July 2006. In addition, Δ p CO 2 exhibited large seasonal variation with positive values in autumn and negative values in other seasons. The positive Δ p CO 2 in autumn was ascribed to vertical mixing with CO 2 -enriched subsurface waters and relatively high SST in this season. The annually integrated sea-air CO 2 flux in the northern ECS was -2.2 ± 2.1 mol m -2 yr -1 , indicating CO 2 absorption from atmosphere to the sea, which was more than two times lower than the previous estimate (Shim et al. 2007) reported for the same region. This large difference was presumably responsible for the underestimation of winter CO 2 influx by Shim et al. (2007) and the large interannual variation of CO 2 flux. The CO 2 influx in the ECS was twice that estimated for continental shelves worldwide, suggesting that the ECS acts as a strong sink of atmospheric CO 2 compared to other continental shelves.
关键词：Surface pCO2; SST; SSS; Sea air CO2 flux; Seasonal variation; East China Sea;
