OXYGEN IN LAKES, STREAMS, AND RESERVOIRS. SOLUBILITY OF OXYGEN IN WATER RELATIVE TO PRESSURE.

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Presentation transcript:

OXYGEN IN LAKES, STREAMS, AND RESERVOIRS

SOLUBILITY OF OXYGEN IN WATER RELATIVE TO PRESSURE

SOLUBILITY OF OXYGEN IN WATER RELATIVE TO TEMPERATURE

OXYGEN SOURCES ATMOSPHERE PHOTOSYNTHESIS LOSSES CHEMICAL – HUMIC ACIDS – IRON COMMUNITY METABOLISM

RED MUD – BLACK MUD

ORTHOGRADE OXYGEN CURVE

CLINOGRADE OXYGEN CURVE

CHANGE IN SEASONS IN A DIMICTIC LAKE

HOW COULD TWO SIMILAR LAKES HAVE SUCH DIFFERENT OXYGEN PROFILES IN SUMMER?

CHANGE IN OXYGEN PROFILE THROUGH A SUMMER SEASON

HETEROGRADE OXYGEN CURVES

SUPPOSE A LAKE HAS THE FOLLOWING CLINOGRADE OXYGEN CURVE AT THE END OF THE SUMMER SEASON

CASCADE OF EVENTS LEADING TO TURNOVER WITH CHANGE IN OXYGEN PROFILE

OXYGEN CONCENTRATION UNDER CLEAR ICE

LATER IN WINTER

WARMING OF A LAKE DURING SPRING AND EARLY SUMMER

LONGITUDINAL OXYGEN CONCENTRATION IN A STREAM

DAILY OXYGEN CYCLE

OXYGEN CYCLE IN LAKE ERIE BASIN

LAKE NASSER Surface area [km 2 ] 6,000 Volume [km 3 ] 162 Maximum depth [m] 110 Mean depth [m] 70 Water level Regulated Normal range of annual water level fluctuation [m] 25 Length of shoreline [km] ca. 9,000 Catchment area [km 2 ] 2,849,000

LONGITUDINAL PROFILE OF LAKE NASSER

LAKE NASSER OXYGEN

OXYGEN DEFICIT INCREASES WITH INCREASED PHYTOPLANKTON PRODUCTION INCREASED PHOSPHATE INCREASE IN HYPOLIMNETIC VOLUME

OXYGEN DEFICIT PROPORTIONAL TO THE INVERSE OF THE EPILIMNETIC TRANSPARENCY Example: Diamond Lake in Oregon

DO DYNAMICS IN SURFACE WATERS (WETZEL, TABLE 9-2) STREAMRESERVOIRLAKE DOUSUALLY HIGHHIGH HORIZONTAL VARIABILITY, USUALLY WARMER SMALL HORIZONTAL VARIABILITY, USUALLY COOLER OXYGEN UPTAKE FROM ATMOSPHERE HIGHMODERATEVARIABLE TO LOW DIURNAL VARIATION IN OXYGEN HIGHMODESTLOW