Effects of landcover, temperature, and soil on relationship of DOC and CDOM in inland waters

Authors: Jiwei Li*, University of Massachusetts - Amherst, Qian Yu, University of Massachusetts Amherst
Topics: Water Resources and Hydrology, Remote Sensing, Biogeography
Keywords: DOC, watershed, CDOM, DOC model, remote sensing, landcover, soil, mesocosm experiment, carbon cycle
Session Type: Paper
Day: 4/11/2018
Start / End Time: 8:00 AM / 9:40 AM
Room: Iberville, Marriott, River Tower Elevators, 4th Floor
Presentation File: No File Uploaded

Estimation of DOC flux from satellite-derived CDOM information need clearly
examination in inland lakes and rivers. In this study, we examined multiple forcing factors on the
relationship between DOC and CDOM by conducting both the watershed field samplings and
mesocosm experiments. Our study is based on 7 years, bi-monthly field samplings of the CDOM
and DOC at sub-basin scales for exploring how the landcover types and other watershed
biogeography effects regulating DOC/CDOM relationships. Our main findings are DOC/CDOM
relationship were dominantly affected by the land cover types, or terrestrial originated carbon
sources in watersheds. Linear regressed slope for controlling DOC/CDOM co-variations were 2
times higher in evergreen vegetation sources than deciduous and agricultural sources. Giving by
the same CDOM absorption values, the estimated DOC concentrations would be three times
broader in evergreen than that of deciduous and agriculture. Contributed by both field samplings
results and mesocosm experiments, we established one mathematical model for estimating the
DOC variations based on the input of CDOM, landcover types and soil types. The improved
understanding of the DOC/CDOM relationships would greatly benefit to the carbon flux
monitoring through remote sensing approach.

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