A5029833606- Climate variability and models
- Meteorological Phenomena and Simulations
- Hydrology and Watershed Management Studies
- Cryospheric studies and observations
- Tropical and Extratropical Cyclones Research
- Hydrological Forecasting Using AI
- Flood Risk Assessment and Management
- Arctic and Antarctic ice dynamics
- Hydrology and Drought Analysis
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Plant Water Relations and Carbon Dynamics
- Geology and Paleoclimatology Research
- Oceanographic and Atmospheric Processes
- Wind and Air Flow Studies
- Landslides and related hazards
- Water resources management and optimization
- Reservoir Engineering and Simulation Methods
- Wind Energy Research and Development
- Tree-ring climate responses
- Soil Moisture and Remote Sensing
- Fire effects on ecosystems
- Solar Radiation and Photovoltaics
- Marine and environmental studies
- Advanced Computational Techniques in Science and Engineering
NOAA Physical Sciences Laboratory
2020-2022
National Oceanic and Atmospheric Administration
2009-2022
NOAA Earth System Research Laboratory
2009-2020
Physical Sciences (United States)
2009-2020
Cooperative Institute for Research in Environmental Sciences
2009-2018
University of Colorado Boulder
2013-2018
University of California, Los Angeles
2008-2010
University of California System
2007
Abstract This study utilizes multiple decades of daily streamflow data gathered in four major watersheds western Washington to determine the meteorological conditions most likely cause flooding those watersheds. Two are located Olympic Mountains and other two Cascades; each has uniquely different topographic characteristics. The flood analysis is based on maximum flow observed during water year (WY) at site [i.e., annual peak (APDF)], with an initial emphasis 12 recent years between WY1998...
Fire plays a crucial role in many ecosystems, and better understanding of different controls on fire activity is needed. Here we analyze spatial variation danger during episodic wind events coastal southern California, densely populated Mediterranean‐climate region. By reconstructing almost decade weather patterns through detailed simulations Santa Ana winds, produced the first high‐resolution map where these hot, dry winds are consistently most severe which areas relatively sheltered. We...
The atmospheric conditions that lead to strong offshore surface winds in Southern California, commonly referred as Santa Ana winds, are investigated using the North American Regional Reanalysis and a 12-year, 6-km resolution regional climate simulation of California. We first construct an index characterize events based on wind strength. This is then used identify average synoptic associated with events—a high pressure anomaly over Great Basin. causes geostrophic roughly perpendicular...
Abstract Self‐organizing maps (SOMs) were used to explore relationships between large‐scale synoptic conditions, especially vertically integrated water vapor transport (IVT), and extreme precipitation events in the U.S. Intermountain West (IMW). By examining spatial patterns IVT, pathways are identified where moisture can penetrate into IMW. A substantial number of IMW associated with infrequently occurring patterns. The transition frequency each SOM nodes, which indicate temporal patterns,...
Abstract This work evaluates the fidelity of polar marine Ekman layer in Regional Arctic System Model (RASM) and Community Earth (CESM) using sea-ice inertial oscillations as a proxy for ice-ocean transport. A case study is presented that demonstrates RASM replicates close agreement with motion derived GPS. result obtained from year-long pre-dating recent decline perennial sea ice, sub-hourly coupling between atmosphere, ocean components. To place this context, method applied to CESM,...
Abstract Using a 6-km-resolution regional climate simulation of Southern California, the effect orographic blocking on precipitation climatology is examined. To diagnose whether occurs, precipitating hours are categorized by bulk Froude number. The distribution becomes much more spatially homogeneous as number decreases, and an inspection winds confirms that this results from increasing prevalence blocking. Low (Froude approximately less than 1), blocked cases account for large fraction...
The U.S. Geological Survey, Multi Hazards Demonstration Project (MHDP) uses hazards science to improve resiliency of communities natural disasters including earthquakes, tsunamis, wildfires, landslides, floods and coastal erosion. project engages emergency planners, businesses, universities, government agencies, others in preparing for major disasters. also helps set research goals provides decision-making information loss reduction improved resiliency. first public product the MHDP was...
Abstract Five 915-MHz wind profilers and GPS receivers across California's northern Central Valley (CV) adjacent Sierra foothills coastal zone, in tandem with a 6-km-resolution gridded reanalysis dataset generated from the Weather Research Forecasting Model, document key spatiotemporal characteristics of barrier jets (SBJs), landfalling atmospheric rivers (ARs), their interactions. Composite kinematic thermodynamic analyses are based on 13 strongest SBJ cases observed by Sloughhouse profiler...
Abstract The data required to drive distributed hydrological models are significantly limited within mountainous terrain because of a scarcity observations. This study evaluated three common configurations forcing data: 1) one low-elevation station, combined with empirical techniques; 2) gridded output from the Weather Research and Forecasting Model (WRF); 3) combination two. Each configuration was heavily instrumented North Fork American River basin in California during October–June...
The USGS Multihazards Project is working with numerous agencies to evaluate and plan for hazards damages that could be caused by extreme winter storms impacting California. Atmospheric hydrological aspects of a hypothetical storm scenario have been quantified as basis estimation human, infrastructure, economic, environmental impacts emergency-preparedness flood-planning exercises. In order ensure scientific defensibility necessary levels detail in the description, selected historical...
Abstract This wind profiler–based study highlights key characteristics of the barrier jet along windward slope California’s Sierra Nevada. Between 2000 and 2007 roughly 10% 100 000 hourly profiles, recorded at two sites, satisfied sierra (SBJ) threshold criteria described in text. The mean magnitude terrain-parallel flow SBJ core (i.e., Vmax) was similar both sites (∼17.5 m s−1) a comparable altitude, 500–1000 above surface. cross-mountain speed weak altitude Vmax, consistent with blocked...
Abstract An intercomparison of landfalling atmospheric rivers (ARs) between four reanalysis data sets using one satellite‐derived AR detection method as a metric to characterize along the U.S. West Coast is performed over 15 cool seasons (October–March) during period from water years 1998 2012. The analyzed in this study are Climate System Forecast Reanalysis (CFSR), Modern‐Era Retrospective Analysis for Research and Applications (MERRA), ERA‐Interim (ERA‐I), Twentieth Century version 2...
Abstract Atmospheric rivers (ARs) are well-known producers of precipitation along the U.S. West Coast. Depending on their intensity, orientation, and location landfall, some ARs penetrate inland cause heavy rainfall flooding hundreds miles from coast. Climate change is projected to potentially alter a variety AR characteristics impacts. This study examines potential future changes in moisture transport type, distribution for high-impact landfalling event Pacific Northwest using an ensemble...
Abstract Studies of land surface processes in complex terrain often require estimates meteorological variables, i.e., the incoming solar irradiance ( Q si ), to force models. However, are rarely evaluated within mountainous environments. We four methods estimating : CERES Synoptic Radiative Fluxes and Clouds (SYN) product, MTCLIM, a regional reanalysis product derived from long‐term Weather Research Forecast simulation, Mountain Microclimate Simulation Model (MTCLIM). These products over...
We investigate the representation of Sierra Barrier Jet (SBJ) in four numerical models at different resolutions, primarily documenting its within a high‐resolution (6 km), 11‐year WRF reanalysis downscaling (WRF‐RD). A comprehensive validation this dynamical is undertaken during 11 cool seasons (water years 2001–2011, October to March) using available wind profiler data Chico, CA (CCO). identify SBJ cases observed CCO data, as well WRF‐RD closest grid point. WRF‐RD's compared with that other...
Abstract Some of the strongest near‐surface winds on Earth form in Arctic and sub‐Arctic due to intense midlatitude cyclones mesoscale processes, these strong surface have important impacts ocean sea ice processes. We examine climatological distribution over‐ocean, wind speeds within a Pan‐Arctic domain for 18 years (1990–2007) four gridded data sets: European Centre Medium‐Range Weather Forecasts Interim reanalysis (ERA‐I), Climate Forecast System Reanalysis, version 2 Common Ocean‐Ice...
[1] In the middle of March 2002 a synoptic upwelling event occurred in Southern California Bight; it was marked by precipitous cooling at least 4°C within 10–20 km coast. By end month preevent temperatures had slowly recovered. The Regional Oceanic Model System (ROMS) is used to simulate with an atmospheric downscaling reanalysis for surface wind and buoyancy flux forcing. Lateral boundary conditions temperature, salinity, velocity, sea level are taken from global oceanic product. Barotropic...
ABSTRACT Using output from a high‐resolution meteorological simulation, we evaluate the sensitivity of southern California wind energy generation to variations in key characteristics current turbines. These include hub height, rotor diameter and rated power, depend on turbine make model. They shape turbine's power curve thus have large implications for capacity farms. For each characteristic, find complex substantial geographical generation. However, associated with characteristic can be...
This work investigates the utility of National Oceanic and Atmospheric Administration’s Water Model (NWM) for water management operations by assessing total inflow into a select number reservoirs across Central Western U.S. Total is generally an unmeasured quantity, though critically important anticipating both floods shortages in supply over short-term (hourly) to sub-seasonal (monthly) time horizon. The NWM offers such information at 5000 U.S., however, its skill representing processes...