Salinity, Tides, and Circulation
Salinity, Tides and Circulation
Water is the lifeblood of the Bay
Organic - carbon containing
Inorganic - minerals, dissolved gases nutrients
supports - planktonic forms ( zooplankton )
Dynamic interaction of freshwater input, salinity, tidal flow
Understand fluctuating conditions
18 trillion gallons of water. Drain it would take a year to refill it.
70,000 cubic feet ( 2,000 cubic meters ) each second flow into bay form tributaries
1/9 of volume of seawater flowing into Bay at any instant
Storm pulse like a transfusion
Bay watershed spans 64,000 square miles
6 surrounding states
Susquehanna River 50 % of Bays freshwaterdrainage
Second reason - out of 150, 46 major tributaries, 8 of these contribute 90 % of freshwater inflow.
On the western side of the Bay: Potomac, James, Rappahannock, York, Patuxent, and West Chesapeake Drainage
Primary: Susquehanna - flows from north
Drains part of Eastern shore: Choptank
Chesapeake is right handed and top heavy as far as freshwater
8 major rivers and ocean: Shapes circulation and salinity character of Bay
From Susquehanna to mouth of Bay = Zero 0 to almost marine
Define salinity: 35 g of dissolved salts/ kg of water
brackish salinity ?
freshwater salinity ?
Buoyancy difference and layers
salinity gradient - sun, moon,earths rotation
Phases of the moon
high tide and low tide
Size and depth of basin
Semidiurnal tidal pattern
Tidal currents and horizontal movements
Two - layer estuarine flow
Zone of turbidity
Home for organisms " residents "
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