Stream water acidification in the Far East of Russia under changing atmospheric deposition and precipitation patterns

Zhigacheva, Ekaterina S.; Sase, Hiroyuki; Nakata, Masao; Ohizumi, Tsuyoshi; Gromov, Sergey; Takahashi, Masaaki

doi:10.1007/s10201-022-00696-0

Cited by 5 publications

(1 citation statement)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Changes in precipitation cause the runoff of fertilizers applied to agricultural land, greatly increasing NO 3 − loading and eutrophication (Sinha et al, 2017). Increases in precipitation and changes in precipitation patterns appear to have accelerated the runoff of accumulated/cycled S and dissolved inorganic nitrogen (DIN) derived from air pollution, and disrupted material cycles in forest ecosystems (Ding et al, 2022; Mitchell et al, 2013; Nakahara et al, 2010; Sase et al, 2019; Zhigacheva et al, 2022). Therefore, the relationship between climate change and air pollution requires careful investigation.…”

Section: Introductionmentioning

confidence: 99%

Sulfate runoff processes during rainfall events in a small forested catchment on the sea of Japan side recovering from acidification under climate change

Yotsuyanagi,

Morohashi,

Takahashi

et al. 2024

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

Changes in rainfall patterns due to climate change may accelerate the runoff of sulfate (SO42−), which is anthropogenically emitted and deposited as an air pollutant, cycled in forest ecosystems, and partly accumulated in forest soils. A forested catchment on the Sea of Japan side in central Japan is significantly affected by transboundary air pollution from the Asian continent due to northwesterly seasonal winds in winter. In this study, intensive 24‐h observations were conducted every hour eight times from 2019 to 2020 to clarify changes in stream water quality and runoff processes during rainfall events. The pH, electrical conductivity, and SO42− concentration in stream water decreased with increasing hourly average discharge rate (L sec−1). The SO42− concentration was negatively correlated with discharge rate. Hydrograph separations using the water isotopic parameter (deuterium excess, d‐excess = δ2H – 8 × δ18O) showed that most of the stream flow during the rain events was derived from pre‐storm water. A significant negative correlation between the d‐excess and stream water discharge was found for all six events where the water isotope analysis was applied. However, the S isotope ratio (δ34S) in stream water was not correlated with discharge rate during rainfall events and was obviously different (>1.5‰) from rainwater δ34S in the same month. This suggests that rainwater SO42− during rainfall events did not directly flow to the stream but was retained in the forest ecosystem. The isotopically well homogenized internal SO42− appeared to be mainly released into the stream during rainfall events. Future climate change may further accelerate SO42− runoff from forest catchments and disrupt material cycles in the ecosystem if warming causes more intense rainfall.

show abstract