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  Image: Geographic Location Direction Photo #: ISS049-E-1090 Date: Sep. 2016
Geographic Region: ARGENTINA
Feature: IBERA WETLAND LAKES, SUNGLINT

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  Ibera Wetlands, Parana River inland delta, NE Argentina

An astronaut flying over central South America was following the Sun's reflection point (also known as sunglint) as it flashed across the water surfaces of the Ibera Wetlands. Sunglint makes for startling images that appear more like black-and-white photos. The many bright, irregular, elongated patches (especially on the lower right) are bigger lakes, while the smaller, more circular features are hundreds of tiny ponds (upper left). Interestingly, the name Ibera comes from y bera, the local Guarani words meaning bright water.



South America's second-largest river, the Parana, used to flow through this area from top right to lower left. The river built up a great inland delta, leaving the larger lakes in the slightly lower areas of the floodplain. The tiny lakes are situated on older river terraces, which stand 3 to 9 meters higher than the average local elevation. The region is so waterlogged that farming is difficult and is restricted to the higher, drier ground. (See the farm fields near the top right.)



It is unclear why the higher areas have the lakelets, or why they are so round in shape. But one idea is that during very dry times in the last Ice Age, dry winds scoured out numerous hollows, as we see in many deserts today. When the climate grew wetter, these depressions filled with water and marshy vegetation colonized the shorelines. As sediment slowly washed into the lakelets, all angular shoreline shapes became smoothed and rounded. The smallest ponds are almost completely filled with vegetation, except for a halo along the shorelines where open water reflects the Sun. It is unclear why the ponds have developed this interesting vegetation pattern.

 
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Images: All Available Images Low-Resolution 144k
Mission: ISS049  
Roll - Frame: E - 1090
Geographical Name: ARGENTINA  
Features: IBERA WETLAND LAKES, SUNGLINT  
Center Lat x Lon: 27.9S x 57.8W
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
 
Camera: N6
 
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 800  
 
Nadir to Photo Center Direction: NW   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number:  
 
Date: 20160910   YYYYMMDD
Time: 173321   GMT HHMMSS
Nadir Lat: 31.5S  
Latitude of suborbital point of spacecraft
Nadir Lon: 53.4W  
Longitude of suborbital point of spacecraft
Sun Azimuth: 315   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 220   nautical miles
Sun Elevation: 44   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views:  
Water Views: DELTA, RIVER, SEDIMENT, SUNGLINT  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences


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