2009-10_31_BOS-SFO_400z - a photo on Flickriver

2009-10_31_BOS-SFO_400z

These are salt evaporation ponds on the shores of San Francisco Bay, filled with slowly evaporating salt water impounded within levees in former tidelands. There are many of these ponds surrounding the South Bay.

A series microscopic life forms of different kinds and colors predominate to in series as the water evaporates. First comes green algae. Next brine shrimp predominate, turning the pond orange. Next, dunaliella salina, a micro-algae containing high amounts of beta-carotene (itself with high commercial value), predominates, turning the water red. Other organisms can also change the hue of each pond. The full range of colors include red, green, orange and yellow, brown and blue. Finally, when the water is evaporated, the white of salt alone remains. This is harvested with machines, and the process repeats.

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Taken on: October 31, 2009

Tags:

salt ponds

San Francisco Bay

bos-sfo

aerial

aviation

flying

approach

water

red

brown

orange

salt

windowseat

windowshot

United

UAL

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Sets appears in: • 2009_10_31 Salt Ponds

Camera: Canon EOS 30D, f/8.0, 1/160 sec, 47mm, ISO 160 (more info) (hide info)

Camera:	Canon EOS 30D
Lens:	18.0-200.0 mm
Aperture:	f/8.0
Exposure Time:	0.006 sec (1/160)
Focal Length:	47mm
ISO:	160
Exposure Bias:	+2 EV
Flash:	Off, Did not fire
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Spot
White Balance:	Manual
Color Space:	sRGB
Software:	Adobe Photoshop Camera Raw 9.1.1 (Macintosh)
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