A5040071351- Hydrology and Watershed Management Studies
- Meteorological Phenomena and Simulations
- Flood Risk Assessment and Management
- Geophysics and Gravity Measurements
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Hydrological Forecasting Using AI
- Groundwater and Isotope Geochemistry
- Maritime Navigation and Safety
- Hydrology and Drought Analysis
- Hydrology and Sediment Transport Processes
- Cryospheric studies and observations
- Geophysical and Geoelectrical Methods
- Precipitation Measurement and Analysis
- Reservoir Engineering and Simulation Methods
- Remote Sensing and LiDAR Applications
- Underwater Vehicles and Communication Systems
- Vector-Borne Animal Diseases
- Soil Moisture and Remote Sensing
- Groundwater and Watershed Analysis
- Climate Change and Environmental Impact
- Spacecraft Design and Technology
- Plant Water Relations and Carbon Dynamics
- Aerospace Engineering and Energy Systems
- Vaccine Coverage and Hesitancy
University of Washington
2005-2019
Purdue University West Lafayette
2015
Jacksonville State University
2014
Stanford University
2007
Abstract Droughts can be characterized by their severity, frequency and duration, areal extent. Depth–area–duration analysis, widely used to characterize precipitation extremes, provides a basis for the evaluation of drought severity when storm depth is replaced an appropriate measure severity. Gridded temperature data were force physically based macroscale hydrologic model at 1/2° spatial resolution over continental United States, construct history from 1920 2003 on model-simulated soil...
Abstract This study quantifies mean annual and monthly fluxes of Earth’s water cycle over continents ocean basins during the first decade millennium. To extent possible, flux estimates are based on satellite measurements data-integrating models second. A careful accounting uncertainty in is included. It applied within a routine that enforces multiple energy budget constraints simultaneously variational framework order to produce objectively determined optimized estimates. In majority cases,...
Abstract New objectively balanced observation-based reconstructions of global and continental energy budgets their seasonal variability are presented that span the golden decade Earth-observing satellites at start twenty-first century. In absence balance constraints, various combinations modern flux datasets reveal current estimates net radiation into Earth’s surface exceed corresponding turbulent heat fluxes by 13–24 W m−2. The largest imbalances occur over oceanic regions where component...
Surface water elevation profiles for a reach of the Ohio River were produced by Jet Propulsion Laboratory Instrument Simulator to represent satellite measurements representative those that would be observed wide swath altimeter being considered jointly U.S. and European space agencies. The Ensemble Kalman filter with river hydrodynamics model as its dynamical core was used assimilate synthetic observations, estimate discharge. able recover depth discharge, reducing discharge RMSE from 23.2%...
Abstract Underestimation of precipitation in topographically complex regions plagues most gauge-based gridded datasets. Gauge locations are usually or near population centers, which tend to lie at low elevations relative the surrounding terrain. For hydrologic modeling purposes, resulting bias can result serious underprediction observed flows. A water balance approach develop a globally consistent correction for underestimation mountainous is described. The adjustment based on combination...
Abstract. For much of the last century, forecasting centers around world have offered seasonal streamflow predictions to support water management. Recent work suggests that two major avenues advance predictability are improvements in estimation initial hydrologic conditions (IHCs) and incorporation climate information. This study investigates marginal benefits a variety methods using IHCs and/or information, focusing on supply forecasts (WSFs) five case watersheds located US Pacific...
River discharge and lake water storage are critical elements of land surface hydrology, but poorly observed globally.The Surface Water Ocean Topography (SWOT) satellite mission will provide high-resolution measurements elevations with global coverage.Feasibility studies have been undertaken to help define the orbit inclination repeat period.Preliminary error budgets computed for estimating instantaneous monthly river from SWOT (errors assumed uncorrelated).Errors on due temporal sampling...
Abstract A common term in the continental and oceanic components of global water cycle is freshwater discharge to oceans. Many estimates annual average have been made over past 100 yr with a surprisingly wide range. As more observations become available continental-scale land surface model simulations runoff improved, these are cast somewhat different light. In this paper, combination from 839 river gauging stations near outlets large basins used simulated fields two implementations Variable...
Northern Eurasia, the largest landmass in northern extratropics, accounts for ~20% of global land area. However, little is known about how biogeochemical cycles, energy and water human activities specific to this carbon-rich, cold region interact with climate. A major concern that changes distribution land-based life, as well its interactions environment, may lead a self-reinforcing cycle accelerated regional warming. With motivation, Eurasian Earth Science Partnership Initiative (NEESPI)...
Abstract. We assess the significance of groundwater storage for seasonal streamflow forecasts by evaluating its contribution to interannual anomalies in 29 tributary sub-basins Colorado River. Monthly and annual changes total basin are simulated two implementations Variable Infiltration Capacity (VIC) macroscale hydrology model – standard release model, an alternate version that has been modified include SIMple Groundwater Model (SIMGM), which represents unconfined aquifer underlying soil...
[1] Wildfires affect the coupled dynamics of vegetation, runoff response, and sediment production, as well sequencing post-fire precipitation snowmelt in forested watersheds. We examined these interactions by applying a spatially distributed hydrologic model to multiple-year periods before after major fire that occurred 1970 Entiat River basin, Washington. The effects on delivery were simulating if it had at other times 50-year period. Simulated varied factor two depending timing. also...
Abstract We examine the relative contributions of root zone soil moisture (SM) and groundwater (GW) storage to trends interannual variability in total water (TWS) from essentially entire Gravity Recovery Climate Experiment (GRACE) record (2003–2016). Our study region is Eastern United States where GW generally shallow, we use observations simulations a suite land surface models (LSMs) are not available. first consider Illinois, which has long‐term network SM sensors observation wells....
Abstract. For much of the last century, forecasting centers around world have offered seasonal streamflow predictions to support water management. Recent work suggests that two major avenues advance predictability are improvements in estimation initial hydrologic conditions (IHCs) and incorporation climate information. This study investigates marginal benefits a variety methods using IHC and/or information, focusing on supply forecasts (WSFs) five case watersheds located U.S. Pacific...
The threat of bioterrorism and pandemics has highlighted the urgency for rapid reliable bioaerosol detection in different environments. Safeguarding against such threats requires continuous sampling ambient air pathogen detection. In this study we investigated efficacy Airborne Sample Analysis Platform (ASAP) 2800 sampler to collect representative samples identify specific viruses suspended as bioaerosols. To test concept, aerosolized an innocuous replication-defective bovine adenovirus...
Abstract Satellite radar altimetry has enabled the study of water levels in large lakes and reservoirs at a global scale. The upcoming Surface Water Ocean Topography (SWOT) satellite mission (scheduled launch 2020) will simultaneously measure surface extent elevation an unprecedented accuracy resolution. However, SWOT retrieval be affected by number factors, including wet tropospheric delay—the delay signal's passage through atmosphere due to atmospheric content. In past applications, over...
Recent reports from credible research groups suggest that climate change is a reality. The steady rise in extreme weather events over the past decade represents leading edge of change. Climate-induced interactions within and between natural environment our human constructed systems will not only exacerbate existing vulnerabilities but create new ones. Emergency managers at all levels need to plan prepare for adaptation challenges, which should enable communities successfully storm. ability...
Abstract. We assess the significance of groundwater storage for seasonal streamflow forecasts by evaluating its contribution to interannual anomalies in 29 tributary sub-basins Colorado River. Monthly and annual changes total basin are simulated two implementations Variable Infiltration Capacity (VIC) macroscale hydrology model – standard release model, an alternate version that has been modified include SIMple Groundwater Model (SIMGM), which represents unconfined aquifer underlying soil...