08 Nov 2022
08 Nov 2022
Status: this preprint is currently under review for the journal ESurf.

Mobile evaporite enhances the cycle of physical-chemical erosion in badlands

Ci-Jian Yang1,2, Pei-Hao Chen1, Erica D. Erlanger2, Jens M. Turowski2, Sen Xu2, Tse-Yang Teng3, Jiun-Chuan Lin1, and Jr-Chuang Huang1 Ci-Jian Yang et al.
  • 1Department of Geography, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
  • 2German Research Centre for Geosciences (GFZ), Telegrafenberg 14473, Potsdam, Germany
  • 3Sustain-vision Consulting Co. Ltd., Taipei 11168, Taiwan

Abstract. Chemical weathering driven by physical erosion is one of the manifestations of natural processes that strongly affect chemical and solid matter budgets at the Earth’s surface. However, the influence of extreme climatic erosion on chemical weathering dynamics is poorly understood. Badland landscapes formed in highly erodible, homogeneous substrates have the potential to respond to individual events on scales that are rapid enough for direct observation. Here, we assess the geochemical and grain-size composition of suspended sediment and riverine chemistry measurements collected from two catchments during the 2017 Nesat and Haitang typhoons in southwestern Taiwan. During the typhoons, the sodium adsorption ratio covaried with suspended sediment concentration, which we attributed to sodium-induced deflocculation. Evaporite weathering at peak rainfall is succeeded by peak silicate weather at maximum discharge, which dominates the weathering signal of the event. Overall, our observations suggest that initial weathering of near-surface evaporite enhances the physical erosion of silicate rock during extreme rainfall events.

Ci-Jian Yang et al.

Status: open (until 18 Jan 2023)

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  • RC1: 'Comment on esurf-2022-53', Anonymous Referee #1, 24 Nov 2022 reply

Ci-Jian Yang et al.

Ci-Jian Yang et al.


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Short summary
Observations of interaction between extreme physical erosion and chemical weathering dynamics are limited. Here, we presented a major elements of stream water in the badland catchment at 3-hour intervals during a 3-day typhoon. The excess sodium in the evaporite deposits causes material dispersion through deflocculation, which enhances the suspended sediment flux. Moreover, we observed a shift from predominantly evaporite weathering at peak precipitation to silicate weathering at peak discharge.