Everything about Subantarctic Mode Water totally explained
Subantarctic mode water (SAMW) is an important
water mass in the earth's oceans. It is formed near the
Subantarctic Front on the northern flank of the
Antarctic Circumpolar Current. The surface density of Subantarctic Mode Water ranges between about 1026.0 and 1027.0 kg/m
3 and the core of this water mass is often identified as a region of particularly low stratification.
Another important facet of SAMW is that
silicate (an important nutrient for
diatoms) is relatively depleted relative to
nitrate. This depletion can be tracked over much of the globe, suggesting that SAMW helps set the blend of nutrients delivered to low-latitude ocean ecosystems, and thus determines the balance of species within these ecosystems.
Image:Samw_indian.gif|Salinity (colors) and temperature (contours) at 50E, illustrating the low stratification layer associated with the Subantarctic Mode Water at this longitude.
Image:Samw_wpacific.gif|Salinity (colors) and temperature (contours) at 170W, showing that the SAMW is much closer in temperature to the salinity minimum associated with the Antarctic Intermediate Water.
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