Seasonal hydrography and surface outflow in a fjord with a deep sill: the Reloncavi fjord, Chile

• Seasonal data on temperature, salinity, dissolved oxygen (DO) and chlorophyll, combined with meteorological and river discharge time series, were used to describe the oceanographic conditions of the Reloncavi fjord (41 degrees 35' S, 72 degrees 20' W). The winds in the fjord valley mainly blow down-fjord during the winter, reinforcing the upper layer outflow, whereas the winds blow predominantly up-fjord during the spring and summer, contrary to the upper layer outflow. The fjord, with a deep sill at the mouth, was well stratified year-round and featured a thin surface layer of brackish water with mean salinities between 10.4 +/- 1.4 (spring) and 13.2 +/- 2.5 (autumn). The depth of the upper layer changed slightly among the different studied seasons but remained at 4.5 m near the mouth. This upper layer presented a mean outflow (Q(1)) of 3185 +/- 223 m(3) s(-1), which implies a flushing time of 3 days for this layer. The vertical salt flux was similar to 37 tons of salt per second, similar to the horizontal salt flux observed in the upper layer. These estimates will contribute to better management of the aquaculture in this region.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)

Nyckelord

patagonian fjords

southern chile

ocean

ecosystem

salinity

systems

coast

Meteorology & Atmospheric Sciences

Oceanography

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