Exploring the Effect of Aspect to Inform Future Earthcasts of Climate-Driven Changes in Weathering of Shale

P. L. Sullivan, Y. Goddéris, Yuning Shi, X. Gu, J. Schott, E. A. Hasenmueller, Jason Philip Kaye, C. Duffy, L. Jin, Susan Louise Brantley

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Projections of future conditions within the critical zone—earthcasts—can be used to understand the potential effects of changes in climate on processes affecting landscapes. We are developing an approach to earthcast how weathering will change in the future using scenarios of climate change. As a first step here, we use the earthcasting approach to model aspect-related effects on soil water chemistry and weathering on hillsides in a well-studied east-west trending watershed (Shale Hills, Pennsylvania, USA). We completed model simulations of solute chemistry in soil water with and without the effect of aspect for comparison to catchment observations. With aspect included, aqueous weathering fluxes were higher on the sunny side of the catchment. But the effect of aspect on temperature (0.8 °C warmer soil on sunny side) and recharge (100 mm/year larger on shaded side) alone did not explain the magnitude of the observed higher weathering fluxes on the sunny side. Modeled aspect-related differences in weathering fluxes only approach field observations when we incorporated the measured differences in clay content observed in augered soils on the two hillslopes. We also had to include a biolifting module to accurately describe cation concentrations in soil water versus depth. Biolifting lowered some mineral dissolution rates while accelerating kaolinite precipitation. These short-duration simulations also highlighted that the inherited differences in particle size on the two sides of the catchment might in themselves be explained by weathering under different microclimates caused by aspect—over longer durations than simulated with our models.

Original languageEnglish (US)
Pages (from-to)974-993
Number of pages20
JournalJournal of Geophysical Research: Earth Surface
Volume124
Issue number4
DOIs
StatePublished - Apr 1 2019

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shale
weathering
Weathering
Shale
Climate change
climate
climate change
soils
Soils
Catchments
soil water
catchment
Fluxes
Water
chemistry
Kaolin
duration
kaolinite
soil chemistry
water depth

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Sullivan, P. L. ; Goddéris, Y. ; Shi, Yuning ; Gu, X. ; Schott, J. ; Hasenmueller, E. A. ; Kaye, Jason Philip ; Duffy, C. ; Jin, L. ; Brantley, Susan Louise. / Exploring the Effect of Aspect to Inform Future Earthcasts of Climate-Driven Changes in Weathering of Shale. In: Journal of Geophysical Research: Earth Surface. 2019 ; Vol. 124, No. 4. pp. 974-993.
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Exploring the Effect of Aspect to Inform Future Earthcasts of Climate-Driven Changes in Weathering of Shale. / Sullivan, P. L.; Goddéris, Y.; Shi, Yuning; Gu, X.; Schott, J.; Hasenmueller, E. A.; Kaye, Jason Philip; Duffy, C.; Jin, L.; Brantley, Susan Louise.

In: Journal of Geophysical Research: Earth Surface, Vol. 124, No. 4, 01.04.2019, p. 974-993.

Research output: Contribution to journalArticle

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AU - Sullivan, P. L.

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AU - Shi, Yuning

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AU - Schott, J.

AU - Hasenmueller, E. A.

AU - Kaye, Jason Philip

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AU - Jin, L.

AU - Brantley, Susan Louise

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