scholarly journals REY-Th-U Solute Dynamics in the Critical Zone: Combined Influence of Chemical Weathering, Atmospheric Deposit Leaching, and Vegetation Cycling (Mule Hole Watershed, South India)

2017 ◽  
Vol 18 (12) ◽  
pp. 4409-4425 ◽  
Author(s):  
Jean-Jacques Braun ◽  
Jean Riotte ◽  
Shrema Battacharya ◽  
Aurélie Violette ◽  
Jonathan Prunier ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
South India ◽  
Critical Zone ◽  
Solute Dynamics

scholarly journals REY-Th-U Dynamics in the Critical Zone: Combined Influence of Reactive Bedrock Accessory Minerals, Authigenic Phases, and Hydrological Sorting (Mule Hole Watershed, South India)

2018 ◽  
Vol 19 (5) ◽  
pp. 1611-1635 ◽  
Author(s):  
Jean-Jacques Braun ◽  
Jean Riotte ◽  
Shrema Battacharya ◽  
Aurélie Violette ◽  
Priscia Oliva ◽  
...  
Keyword(s):  
South India ◽  
Critical Zone ◽  
Accessory Minerals

Sediment export in marly badland catchments controlled by frost cracking intensity, Draix-Bléone CZO, SE France

2021 ◽  
Author(s):  
Coline Ariagno ◽  
Caroline Le Bouteiller ◽  
Peter Van der Beek ◽  
Sébastien Klotz
Keyword(s):  
Chemical Weathering ◽  
Rainfall Variability ◽  
Critical Zone ◽  
Careful Consideration ◽  
Sediment Flux ◽  
Climate Conditions ◽  
Physical Weathering ◽  
Changing Climate ◽  
Sediment Export ◽  
Se France

<p>At the interface between the lithosphere and the atmosphere, the critical zone records the complex interactions between erosion, climate, geologic substrate and life, and can be directly monitored. The sparsely vegetated, steep marly badland catchments of the Draix-Bléone Critical Zone Observatory (CZO), SE France are characterised by high quantities of exported sediment and rapid morphologic changes. Characterizing and understanding the physical weathering processes in this area are key to predict the temporal variability of regolith production and sediment flux, as well as their evolution under changing climate conditions.</p><p>Long data records collected in the Draix-Bléone CZO allow analysing long-term regolith dynamics and climatic control on sediment export. Although widely accepted as the first order control, rainfall variability does not fully explain the observed yearly variability in sediment export, suggesting that regolith production and its controls may contribute to the observed pattern of sediment export. Within the several factors that can influence marls weathering (soil moisture, density, chemical weathering), this study focuses on continuous temperature data, recorded at different locations over multiple years, and aims to highlight the role of frost cracking in regolith production. Several proxies for frost cracking intensity have been calculated from these data and compared to the sediment export anomalies, with careful consideration of field data quality. Our initial results suggest that frost-cracking processes have a significant impact on catchment sediment response and should be taken into account when building a predictive model of sediment export from these catchments under a changing climate.</p>

Chemical weathering and CO2 consumption rate in a multilayered-aquifer dominated watershed under intensive farming: The Orgeval Critical Zone Observatory, France

2018 ◽  
Vol 33 (2) ◽  
pp. 195-213 ◽  
Author(s):  
Paul Floury ◽  
Jérôme Gaillardet ◽  
Gaëlle Tallec ◽  
Patrick Ansart ◽  
Julien Bouchez ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Consumption Rate ◽  
Critical Zone ◽  
Intensive Farming ◽  
Co2 Consumption ◽  
Critical Zone Observatory

scholarly journals Mayotte Critical Zone Observatory: Preliminary Results on Chemical Weathering and Erosion Rates on Volcanic Edifices

2014 ◽  
Vol 10 ◽  
pp. 73-76
Author(s):  
R.-A. Puyraveau ◽  
S. Rad ◽  
I. Basile-Doelsch ◽  
J. Deparis ◽  
T. Jaouën ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Critical Zone ◽  
Preliminary Results ◽  
Erosion Rates ◽  
Critical Zone Observatory

scholarly journals Climatic Variabilities Control the Solute Dynamics of Monsoon Karstic River: Approaches from C-Q Relationship, Isotopes, and Model Analysis in the Liujiang River

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 862 ◽  
Author(s):  
Jing Liu ◽  
Hu Ding ◽  
Min Xiao ◽  
Zhu-Yan Xu ◽  
Yuan Wei ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
Carbonic Acid ◽  
Dissolved Inorganic Carbon ◽  
Climatic Variability ◽  
Sulfide Oxidation ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Soil Co2 ◽  
Solute Dynamics ◽  
The Impact

The dynamics of riverine solutes’ contents and sources reflect geological, ecological, and climatic information of the draining basin. This study investigated the influence of climatic variability on solute dynamics by the high-frequency hydrogeochemical monitory in the Liujiang River draining karst terrain of Guangxi Province, SW (Southwestern) China. In the study river, the content-discharge (C-Q) patterns of riverine solutes indicate that the majority of riverine solutes show similar dilution and near chemostatic behaviors responding to increasing discharge, especially geogenic solutes (such as weathering products from carbonate, silicate, and sulfide oxidation), whereas exogenous solutes (such as atmospheric input to riverine sulfate) and biological solutes (such as soil CO2) show higher contents with increasing discharge. Besides, the biological carbon is the main driver of the chemostatic behaviors of total dissolved inorganic carbon (DIC). The forward model results show that carbonate weathering dominates the water chemistry, and the weathering rates are intensified during high flow period due to additional inputs of weathering agents, i.e., the biologic carbonic acid from dissolution of soil CO2, indicated by δ13CDIC. In addition, there exists the strong capacity of CO2 consumption that is heavily dependent on climatic variables such as precipitation and air temperature in this study river. Our study highlights the impact of climatic variability on solutes dynamics and chemical weathering and thus must be better addressed in C models under future climate change scenarios.

scholarly journals A Multi-Disciplinary Approach to Understand Hydrologic and Geochemical Processes at Koiliaris Critical Zone Observatory

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2474
Author(s):  
Maria A. Lilli ◽  
Dionissis Efstathiou ◽  
Daniel Moraetis ◽  
Jonathan Schuite ◽  
Sofia D. Nerantzaki ◽  
...  
Keyword(s):  
Chemical Weathering ◽  
River Flow ◽  
Earth Tide ◽  
Soil Management ◽  
Critical Zone ◽  
Periodic Signal ◽  
Geochemical Processes ◽  
Structural Elements ◽  
Flood Events ◽  
Critical Zone Observatory

Koiliaris CZO is a European Critical Zone Observatory (CZO) typical of the Mediterranean karstic geomorphology, which represents watersheds affected by humans over the centuries. This study aims to provide information that underpins the hydrologic and geochemical processes functioning at Koiliaris CZO. Linking geomorphologic and tectonic analysis improved the delineation of a karstic area which extends outside of the Koiliaris watershed and identified how structural elements influence the regional hydrology. The fluctuation in the river flow represents processes occurring in the karst and the periodic signal is related to Earth tide stressing of the karstic reservoirs. The conceptualization of a two-reservoir, well-mixed karstic system is confirmed by both the geomorphologic and tidal analysis. The hydrologic response is fast and it is manifested especially during extreme events where 70% of the precipitation becomes surface runoff, creating major flood events. The different sampling sites in the Koiliaris CZO were geochemically clustered and the quantification of the weathering fluxes showed that 25 mm/1000 years and 39 mm/1000 years of carbonate were removed by chemical weathering for the Keramianos ephemeral river and the springs, respectively. These studies illustrate the importance of critical zone science and transdisciplinary studies on water and soil management.

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