Export of terrestrial dissolved organic carbon to coastal rivers as a function of climate and land-surface processes Anthony D. Feig & Yong Q. Tian Central.

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Presentation transcript:

Export of terrestrial dissolved organic carbon to coastal rivers as a function of climate and land-surface processes Anthony D. Feig & Yong Q. Tian Central Michigan University Qian Yu University of Massachusetts-Amherst

As reported by Tian, et. al, in the 2013 publication Ecological Engineering v. 54, p

Seven study sites: Monthly readings, multiple years

Study site properties ALTAPICOLDELNEPPOTSACSJQSUS StateGAFLORNJMADCCA MD % Wetland % Forest % Agriculture % Developed CZDSSMSSSSSS

Discharge-DOC concentrations

DOC vs. Surface air temperature ALT SUS DEL COL SAC SJQ API

Mean DOC & annual temp., precip.

Mean DOC annual flux COLALTAPISJQSACSUSDEL Rivers

Translating temp. increases into DOC loads 1°C increase  mg/L in-stream DOC increase Derived from – 14 years of riverine DOC data (USGS) – Observed annual mean temp increase of 1C

Key findings for riverine DOC export Temperature most important if annual mean >5°C Land surface more important if annual mean <2°C Surface processes can vary annual DOC ±1.65 g/L 1°C increase  mg/L in-stream DOC increase Climate warming: greater impact in cold zones

Conclusions Strong, annual-scale linear relationship: – Mean sfc temps. & mean in-stream DOC Temperature most important if annual mean >5°C Land surface more important if annual mean <2°C Climate warming through biological processes – Primary driver of terrestrial DOC flux – Greater impact in cooler climates 1°C increase  26% increase in per m 2 DOC yield – mg/L riverine DOC rise by °C increase  mg/L in-stream DOC increase