A5073025729- Climate change and permafrost
- Cryospheric studies and observations
- Hydrology and Watershed Management Studies
- Polar Research and Ecology
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Microbial Community Ecology and Physiology
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Hydrological Forecasting Using AI
- Indigenous Studies and Ecology
- Hydrology and Drought Analysis
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Environmental Monitoring and Data Management
- Water-Energy-Food Nexus Studies
- Plant Water Relations and Carbon Dynamics
- Fire effects on ecosystems
- Flood Risk Assessment and Management
- Climate variability and models
- Smart Materials for Construction
- DNA and Biological Computing
- Groundwater and Isotope Geochemistry
- Electrochemical Analysis and Applications
- Fish Ecology and Management Studies
Institute of Arctic and Alpine Research
2015-2023
University of Colorado Boulder
2016-2023
Boston Consulting Group (United States)
2022
Colorado State University
2015
Pennsylvania State University
2013
Groundwater–surface-water (GW-SW) interactions in streams are difficult to quantify because of heterogeneity hydraulic and reactive processes across a range spatial temporal scales. The challenge quantifying these has led the development several techniques, from centimeter-scale probes whole-system tracers, including chemical, thermal, electrical methods. We co-applied conservative smart solute-tracer tests, measurement heads, distributed temperature sensing, vertical profiles solute tracer...
Abstract Despite a multitude of small catchment studies, we lack deep understanding how variations in critical zone architecture lead to hydrologic states and fluxes. This study characterizes dynamics 15 catchments the U.S. Critical Zone Observatory (CZO) network where hypothesized that our subsurface structure would illuminate patterns partitioning. The CZOs collect data sets characterize physical, chemical, biological subsurface, while also monitoring fluxes such as streamflow,...
Abstract Streams in the McMurdo Dry Valleys (MDVs) of Antarctica moderate an important hydrologic and biogeochemical connection between upland alpine glaciers, valley‐bottom soils, lowland closed‐basin lakes. Moreover, MDV streams are simple but dynamic systems ideal for studying interacting ecological dynamics. This work synthesizes 20 years data, collected as part MDVs Long‐Term Ecological Research project, to assess spatial temporal dynamics connectivity streams, Long‐term records stream...
Abstract Antarctic soil ecosystems are strongly controlled by abiotic habitat variables. Regional climate change in the McMurdo Dry Valleys is expected to cause warming over next century, leading an increase frequency of freeze‐thaw cycling habitat. Previous studies show that physiological stress associated with adversely affects invertebrate populations decreasing abundance and positively selecting for larger body sizes. However, it remains unclear whether or not will indeed enhance annual...
Key Points Dispersion is more sensitive using slugs than constant rate methods Storage zone area slug Monte Carlo sensitivity analysis reveal information content of data
Abstract Fluid transit time is understood to be an important control on the shape of concentration‐discharge ( C‐q ) relationships, yet empirical evidence supporting this linkage limited. We investigated relationships for weathering‐derived solutes across seven Antarctic glacial meltwater streams. hypothesized that (H1) solute fluxes in McMurdo Dry Valley streams are reaction limited so characterized by dilution and (H2) explains between‐stream variability degree dilution. Results show...
Gordon Gulch, an upper-montane forest watershed in the Colorado Front Range. As climate warms, fraction of precipitation falling as snow is expected to decrease and timing snowmelt shift earlier spring. In snow-dominated regions, these changes accumulation melt prompt us examine downstream streamflow. The objective this study understand how phase alter surface water inputs (i.e. rainfall snowmelt) partitioning between evapotranspiration We used Distributed Hydrology Soil Vegetation Model...
Abstract Ecological functions are coupled to the physical transport of water and solutes in streams. Transport conservative tracers lotic systems is subject processes advection, dispersion, transient storage, mass loss groundwater. Stream tracer experiments simulation observed breakthrough curve (BTC) data with 1‐D numerical storage models (TSMs) commonly used quantify these processes. Results from TSMs can be useful, but issues related model appropriateness parameter identifiability suggest...
Abstract Concentration‐discharge (C‐Q) relationships are often used to quantify source water contributions and biogeochemical processes occurring within catchments, especially during discrete hydrological events. Yet, the interpretation of C‐Q hysteresis is confounded by complexity critical zone, such as numerous waters hydrochemical nonstationarity. Consequently, researchers must ignore important runoff pathways geochemical sources/sinks, hyporheic zone because it lacks a distinct...
Abstract While continuous monitoring of streamflow and temperature has been common for some time, there is great potential to expand include water quality parameters such as nutrients, turbidity, oxygen, dissolved organic material. In many systems, distinguishing between watershed stream ecosystem controls can be challenging. The usefulness enhanced by the application quantitative models interpret observed patterns in real time. Examples are discussed primarily from glacial meltwater streams...
Abstract The McMurdo Dry Valleys is a polar desert on the coast of East Antarctica where ephemeral wetlands become hydrologically active during warm and sunny summers when subsurface flows are generated from melting snowfields. To understand structure function wetland ecosystems, we investigated hydroecology one such wetland, Wormherder Creek summer 2008 – 2009, was reactivated. Conservative tracer (LiCl) injected for 2‐hr period into stream above to determine flow path orientations...
Abstract Over the past 30 plus years, Arctic has warmed at a rate of 0.6°C per decade. This resulted in considerable permafrost thaw and alterations hydrological biogeochemical processes. Coincident with these changes, recent studies document increases annual fluxes inorganic nutrients larger rivers. Changing nutrient rivers have been largely attributed to warming‐induced active layer expansion newly exposed subsurface source areas. However, ability headwater streams modulate patterns...
Abstract Operational forecast models require robust, computationally efficient, and reliable algorithms. We desire accurate forecasts within the limits of uncertainties in channel geometry roughness because output from these algorithms leads to flood warnings a variety water management decisions. The current operational Water Model uses Muskingum‐Cunge method, which does not account for key hydraulic conditions such as flow hysteresis backwater effects, limiting its ability situations with...
Abstract As is the case for many semi‐arid regions globally, drought in Intermountain West of United States a recurrent, costly phenomenon that leaves few aspects human and natural systems untouched. Here, we focus on impact data evaluation challenges across four non‐agricultural sectors: water utilities, forest resources, public health, recreation tourism. There are marked commonalities way indicators—that is, hydrometeorological conditions—are tracked, but considerable differences how...