RAIN-SNOW TRANSITION
; SOIL-WATER
; FOREST
; TRANSPORT
; CARBON
; RATES
; CO2
; RETENTION
; CATCHMENT
; EVOLUTION
WOS学科分类:
Geosciences, Multidisciplinary
WOS研究方向:
Geology
英文摘要:
Projections of future conditions within the critical zoneearthcastscan 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 degrees C warmer soil on sunny side) and recharge (100mm/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 aspectover longer durations than simulated with our models.
1.Univ Kansas, Dept Geog & Atmospher Sci, Lawrence, KS 66045 USA 2.Observ Midi Pyrenees, CNRS, Geosci Environm Toulouse, Toulouse, France 3.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA 4.Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA 5.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA 6.St Louis Univ, Dept Earth & Atmospher Sci, St Louis, MO 63103 USA 7.Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USA 8.Univ Texas El Paso, Dept Geol Sci, El Paso, TX 79968 USA
Recommended Citation:
Sullivan, P. L.,Godderis, Y.,Shi, Y.,et al. Exploring the Effect of Aspect to Inform Future Earthcasts of Climate-Driven Changes in Weathering of Shale[J]. JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE,2019-01-01,124(4):974-993