USGS collaborator Jin Wu (University of Arizona) prepares a remote sensing instrument for installation near the top of a 213-foot (65-meter) tower at the Amazon forest study site near Santarém, Brazil. The sensor system is being used to improve understanding of how photosynthesis in tropical forests responds to seasonal variations in climate. Tapajós National Forest, near Santarém, Pará, Brazil. Photo credit: Dennis Dye, USGS
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