Acceleration of Antarctic Circumpolar Current at the Drake Passage
during the GRACE era
Previous studies have identified intense climatic change in the Southern
Ocean. However, the response of ACC transport to climate change is not
fully understood. In this study, by using in-situ ocean bottom pressure
(OBP) records and five GRACE products, long-term variations of ACC
transport are studied. Our results confirm the reliability of GRACE CSR
mascon product in ACC transport estimation at the Drake Passage.
Superimposed on interannual variability, ACC transport exhibits an
obvious increasing trend (1.32±0.07Sv year-1) during
the GRACE era. Based on results of a mass-conservation ocean model
simulation, we suggest that the acceleration of ACC is associated with
intensified westerly winds and loss of land ice in Antarctica.