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. The southeastern coastal region is one of the most developed and populated areas inChina. Meanwhile, it has been severely impacted by acid rain over manyyears. The chemical compositions and carbon isotope compositions of dissolvedinorganic carbon ( δ13 C DIC) in river water in the high-flowseason were investigated to estimate the chemical weathering and associatedatmospheric CO2 consumption rates as well as the acid-depositiondisturbance. Mass balance calculations indicated that the dissolvedloads of major rivers in the Southeast Coastal River Basin (SECRB) werecontributed to by atmospheric (14.3 %, 6.6 %–23.4 %), anthropogenic(15.7 %, 0 %–41.1 %), silicate weathering (39.5 %,17.8 %–74.0 %) and carbonate weathering inputs (30.6 %,3.9 %–62.0 %). The silicate and carbonate chemical weathering ratesfor these river watersheds were 14.2–35.8 and1.8–52.1 t km −2  a −1 , respectively. The associated mean CO2 consumption rate by silicate weathering for the whole SECRB was 191×103  mol km −2  a −1 . The chemical and δ13 C DIC evidence indicated that sulfuric and nitric acid(mainly from acid deposition) were significantly involved in the chemicalweathering of rocks. There was an overestimation of CO2 consumptionat 0.19×1012  g C a −1 if sulfuric and nitric acid wereignored, which accounted for about 33.6 % of the total CO2 consumption by silicate weathering in the SECRB. This study quantitativelyhighlights the role of acid deposition in chemical weathering, suggestingthat the anthropogenic impact should be seriously considered in estimations ofchemical weathering and associated CO2 consumption.

biogeosciences

Geochemistry of the dissolved loads during high-flow season of rivers in the southeastern coastal region of China: anthropogenic impact on chemical weathering and carbon sequestration