Synchronous evaporation and aquatic primary production in tropical river networks.

Water Research
Jun ZhongSheng Xu

Abstract

Rivers play an important role in global water and carbon cycling, but there are still large uncertainties concerning evaporation and aquatic photosynthesis. Here we combined measurements of water chemistry, isotopic compositions (i.e., δDw, δ18Ow, δ13CDIC and ▵14CDIC) and geographic characteristics (i.e., river width) to elucidate in-stream hydrological and biogeochemical processes across rivers in Hainan Island, China. The results showed that dissolved inorganic carbon (DIC) in river waters was largely of modern origin, with about 95% from contemporary biogenic sources based on an isotopic mass balance of ▵14CDIC. Significant evaporation and aquatic primary production co-occurred in these tropical rivers with large amounts of water and DIC being rapidly turned over in the water column, altering the water cycle and the carbon balance. High rates of evaporation and aquatic primary production were observed in the headwater segments, with narrow river width but broad available reactive surface area at the air-water interface. The asymmetric aquatic photosynthesis at different river segments caused the spatial heterogeneities of dissolved solutes. The results suggest that the available reactive area at the water-air interface is re...Continue Reading

References

Dec 31, 1997·Nature·C E Boklage
Nov 22, 2013·Nature·Bernhard Wehrli
Jul 25, 2014·PloS One·Jason J VenkiteswaranMarcus B Wallin
Feb 11, 2018·Nature Communications·George H AllenColin J Gleason

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