A5005589503- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Groundwater and Isotope Geochemistry
- Fire effects on ecosystems
- Urban Stormwater Management Solutions
- Soil erosion and sediment transport
- Hydrological Forecasting Using AI
- Cryospheric studies and observations
- Hydrology and Sediment Transport Processes
- Flood Risk Assessment and Management
- Water Quality and Resources Studies
- Plant Water Relations and Carbon Dynamics
- Peatlands and Wetlands Ecology
- Rangeland and Wildlife Management
- Soil Carbon and Nitrogen Dynamics
- Environmental Monitoring and Data Management
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Water Quality and Pollution Assessment
- Urban Heat Island Mitigation
- Landslides and related hazards
- Soil and Unsaturated Flow
- Water resources management and optimization
- Geochemistry and Geologic Mapping
University of Arizona
2015-2024
Rogers (United States)
2010-2023
Mendel University in Brno
2020-2021
Palacký University Olomouc
2021
Idaho State University
2020
Justus-Liebig-Universität Gießen
1997-2010
University of California, Riverside
2001-2007
University of California, San Diego
2004
Hitotsubashi University
1997
In the western United States vast acreages of land are exposed to low levels atmospheric nitrogen (N) deposition, with interspersed hotspots elevated N deposition downwind large, expanding metropolitan centers or large agricultural operations. Biological response studies in North America demonstrate that some aquatic and terrestrial plant microbial communities significantly altered by deposition. Greater productivity is counterbalanced biotic community changes deleterious effects on...
Existing studies on the impacts of climate change groundwater recharge are either global or basin/location-specific. The lack specificity to inform decision making, while local do little clarify potential changes over large regions (major river basins, states, groups states), a scale often important in development water policy. An analysis impact across western United States (west 100° longitude) is presented synthesizing existing and applying current knowledge processes amounts. Eight...
Worldwide, the application of river basin water quality models is increasing, often imposed by law. It is, thus, important to know degree uncertainty associated with these and their a specific watershed. These uncertainties lead errors that are revealed when model outputs compared observations. Such typically described calculating residuals. However, residuals should not be seen as an estimate total uncertainty, since through calibration process, may reduced over-adjustment data, which case...
Here we review the fundamental interactions between hydrology and cycling of carbon (C) nitrogen (N) in terrestrial stream ecosystems. We organize this around five commonly studied environments: land-atmosphere interface, soil, groundwater, streams, headwater catchments. Common among all environments is that hydrological transitions, either episodic changes water availability or hydrologic transport reactants, result disproportionately high rates C N cycling. Two major research challenges...
Despite the importance of mountainous catchments for providing freshwater resources, especially in semi‐arid regions, little is known about key hydrological processes such as mountain block recharge (MBR). Here we implement a data‐based method informed by isotopic data to quantify MBR rates using recession flow analysis. We applied our hybrid sky island catchment southern Arizona, United States. Sabino Creek 91 km 2 with its sources near summit Santa Catalina Mountains northeast Tucson....
The structure of the critical zone (CZ) is a result tectonic, lithogenic, and climatic forcings that shape landscape across geologic time scales. CZ can be probed to measure contemporary rates regolith production hillslope evolution, its fluids solids sampled determine how affects function as living filter for hydrologic biogeochemical cycles. Substantial uncertainty remains regarding variability in climate lithology influence both short (e.g., event) long evolution) We are addressing this...
The isotopic composition of nitrate collected from aerosols, fog, and precipitation was measured found to have a large 17O anomaly with delta17O values ranging 20 percent per thousand 30% (delta17O = - 0.52(delta18O)). This used trace atmospheric deposition semiarid ecosystem in southern California. We demonstrate that the signal is conserved tracer more robust indicator N relative standard delta18O techniques. data indicate substantial portion local soil, stream, groundwater origin does not...
Catchment water quality models have many parameters, several output variables and a complex structure leading to multiple minima in the objective function. General uncertainty/optimization methods based on random sampling (e.g. GLUE) or local PEST) are often not applicable for theoretical practical reasons. This paper presents “ParaSol”, method that performs optimization uncertainty analysis such as distributed models. Optimization is done by adapting Shuffled Complex Evolution algorithm...
[1] Feedbacks among vegetation dynamics, pedogenesis, and topographic development affect the "critical zone"—the living filter for Earth's hydrologic, biogeochemical, rock/sediment cycles. Assessing importance of such feedbacks, which may be particularly pronounced in water-limited systems, remains a fundamental interdisciplinary challenge. The sky islands southern Arizona offer an unusually well-defined natural experiment involving feedbacks because mean annual precipitation varies by...
Processes within the critical zone—spanning groundwater to top of vegetation canopy—have important societal relevance and operate over broad spatial temporal scales that often are not included in existing frameworks for ecosystem services evaluation. Here we expand scope by specifying how zone processes extend context both spatially temporally, determine constraints limit provision services, offer a potentially powerful currency Context: A perspective extends expressly addressing physical...
Abstract Most land surface models (LSMs) used in Earth System Models produce a lower ratio of transpiration ( T ) to evapotranspiration ET than field observations, degrading the credibility Model‐projected ecosystem responses and feedbacks climate change. To interpret this model deficiency, we conducted pair experiments using three‐dimensional, process‐based ecohydrological subhumid, mountainous catchment. One experiment (CTRL) describes lateral water flow, topographic shading, leaf...
Abstract This study investigates the influence of water, carbon, and energy fluxes on solute production transport through Jemez Critical Zone (CZ) impacts C‐Q relationships over variable spatial temporal scales. Chemical depletion‐enrichment profiles soils, combined with regolith thickness groundwater data indicate importance to stream hydrochemistry incongruent dissolution silicate minerals during deep bedrock weathering, which is primarily limited by water fluxes, in this highly fractured,...
Although groundwater is a major resource of water in the western US, little research has been done on impacts climate change storage and recharge West. Here we assess impact projected changes near (2021-2050) far (2071-2100) future across US. Recharge expected to decrease slightly (highly certain) West (-1.6%) Southwest (-2.9%) regions considerably South region (-10.6%) future. The Northern Rockies get more both (+5.0%) (+9.0%) In general, southern portions US are less northern will more....