摘要
Mosby(1934)指出,如果南极区的陆架水由于海冰的形成而变得足够咸,那么该陆架水将因其密度较大而沿着大陆坡下沉,并因此而形成底层水。当然,在南极周围的海域中,由于较高密度的海水下沉而引起的混合过程是十分复杂的。由于南极底层水(AntarcticBottom Water,AABW)的主要源区在威德尔海。
The circulation and mixing in the region of Prydz Bay, Antarctica were studied on the basis of the hydrographical data acquired from the Seventh Chinese National Antarctic Research Expedition (1990/1991). The main results are:(1) In the observed region, the Antarctic Divergence is located within the range of 60°30’ -66°S,and is the boundary between the Antarctic Circumpolar Current (ACC) and the Antarctic Coastal Current (AACC). (2) The eastward ACC consists of both barotropic and baroclinic components having the same order of magnitude. (3) The westward AACC driven mainly by east winds is barotropic with its speed of 5 - 10cm/s. (4) In the 63 - 64°S region of the 73°E section the geostrophic currents at the surface layer (0 - 32. 5m) and subsurface layer (32. 5m -112. 5m) had opposite directions,which seems to indicate that there was a kind of internal wave propagating vertically in January ,1991. (5) In the study area the 68° -73°E and 98°-108°E region were the strong mixing area due to vertical convection between the Circurnpolar Deep Water and Antarctic Shelf Water,which produced heavier water(σt = 27. 90)down to below 800m.
出处
《海洋科学集刊》
CAS
1997年第1期39-52,共14页
Studia Marina Sinica
基金
国家自然科学基金
49376260号
