A5059190587- Meteorological Phenomena and Simulations
- Climate variability and models
- Cryospheric studies and observations
- Precipitation Measurement and Analysis
- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Fire effects on ecosystems
- Tropical and Extratropical Cyclones Research
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Geophysics and Gravity Measurements
- Oceanographic and Atmospheric Processes
- Landslides and related hazards
- Atmospheric and Environmental Gas Dynamics
- Hydrological Forecasting Using AI
- Ocean Waves and Remote Sensing
- Remote Sensing and Land Use
- Atmospheric aerosols and clouds
- Hydrology and Drought Analysis
- Plant Water Relations and Carbon Dynamics
- Geological and Geophysical Studies
- Tree-ring climate responses
- Water Quality and Resources Studies
- Remote Sensing and LiDAR Applications
- Atmospheric chemistry and aerosols
University of California, San Diego
2017-2025
Scripps Institution of Oceanography
2017-2025
Tomorrows Children’s Fund
2024
Universidad Católica Santo Domingo
2022
University of California, Santa Barbara
2013-2020
NOAA National Centers for Environmental Prediction
2020
National Oceanic and Atmospheric Administration
2020
University of Colorado Boulder
2020
NOAA Environmental Modeling Center
2020
NSF National Center for Atmospheric Research
2020
Abstract. The Thomas Fire burned 114 078 ha in Santa Barbara and Ventura counties, southern California, during December 2017–January 2018. On 9 January 2018, high-intensity rainfall occurred over the burn area mountains above communities of Montecito Carpinteria, initiating multiple devastating debris flows. highest intensities with passage a narrow rainband along cold front oriented north to south. Orographic enhancement associated moist southerly flow immediately ahead also played role. We...
Abstract Climatic changes over the central Himalaya are critical for water resources in downstream regions where hundreds of millions people live. Warming and drying this region have both occurred recent decades, but associated meteorological factors difficult to diagnose based on observations from unevenly distributed weather stations, reanalyses, global climate models that poorly reproduce orographic diurnal cycle. Here, trends summer cycle investigated using a 36-year high-resolution...
Abstract Two extreme snowfall events associated with extratropical cyclones, one interacting the western and central Himalaya, are simulated Weather Research Forecasting (WRF) model over 8 days. One event in January 1999 was driven by a longwave trough west Asia, cyclone becoming terrain‐locked Himalayan notch. Another March 2006 further south east, facilitating passage of two successive cyclones along entire ridge, drawing moisture from warm tropical waters. These flow patterns typical for...
Abstract Water management and flood control are major challenges in the western United States. They heavily influenced by atmospheric river (AR) storms that produce both beneficial water supply hazards; for example, 84% of all damages West (up to 99% key areas) associated with ARs. However, AR landfall forecast position errors can exceed 200 km at even 1-day lead time yet many watersheds <100 across, which contributes issues such as 2017 Oroville Dam spillway incident regularly large...
Abstract. Arctic sea ice has been declining rapidly in recent decades. We investigate how the poleward transport of moisture and heat from lower latitudes through atmospheric rivers (ARs) influences variations. use hourly ERA5 (fifth-generation European Reanalysis) data for 1981–2020 at 0.25∘ × resolution to examine meteorological conditions changes associated with ARs Arctic. In years 2012 2020, which had an extremely low summer extent, we show that individual AR events large cyclones...
Abstract Southwest Asia, defined as the region containing countries of Afghanistan, Iran, Iraq, and Pakistan, is water scarce receives nearly 75% its annual rainfall during boreal cold season November–April. The forcing southwest Asia precipitation has been previously examined for entire from perspective climate variability originating over Atlantic tropical Indo-Pacific Oceans. This study examines intermonthly differences in atmospheric conditions directly responsible monthly November–April...
Abstract. Studies of glaciers generally require precise glacier outlines. Where these are not available, extensive manual digitization in a geographic information system (GIS) must be performed, as current algorithms struggle to delineate areas with debris cover or other irregular spectral profiles. Although several approaches have improved upon band ratio delineation areas, none entered wide use due complexity computational intensity. In this study, we present and apply mapping algorithm...
While a strong influence on cold season southwest Asia precipitation by Pacific sea surface temperatures (SSTs) has been previously established, the scarcity of observations prior to 1960 renders region’s long-term history largely unknown. Here large ensemble atmospheric model simulations forced observed time-varying boundary conditions for 1901–2012 is used examine sensitivity November–April SSTs. It first established that models are able reproduce key features regional variability during...
Abstract Numerous studies have projected future changes in High Mountain Asia water resources based on temperature and precipitation from global circulation models (GCMs) under climate scenarios. Although the potential benefit of such is immense, coarse grid‐scale GCMs are unable to resolve Asia's complex topography thus a biased representation regional weather climate. This study investigates biases simulation physical mechanisms that generate snowfall contribute snowpack experiments using...
Abstract California depends on snow accumulation in the Sierra Nevada for its water supply. Snowfall is measured by a combination of pillows, courses, and rain gauges. However, paucity locations these measurements, particularly at high elevations, can introduce artifacts into precipitation estimates that are detrimental hydrologic forecasting. To reduce errors, we need high‐resolution, spatially complete measurements precipitation. Remotely sensed depth equivalent (SWE), with retrieval time...
Abstract Atmospheric rivers (ARs) account for more than 90% of the total meridional water vapor flux in midlatitudes, and 25–50% annual precipitation coastal western United States. In this study, reflectivity profiles from Global Precipitation Measurement Dual‐Frequency Radar (GPM‐DPR) are used to evaluate temperature characteristics ARs over coast North America eastern Pacific Ocean. Evaluation GPM‐DPR bright‐band height using a network ground‐based vertically pointing radars along West...
Abstract Southern California water resources are heavily dependent on a small number of extreme precipitation events each winter season, which dictate the region's highly variable interannual accumulations. In Santa Ana River Watershed, average, three per year contribute half annual precipitation, yet there relatively few studies synoptic to mesoscale processes that drive during these events. This study uses an ingredient‐based approach in identifying contributions orographic forcing,...
Abstract. Ice-nucleating particles (INPs) have been found to influence the amount, phase and efficiency of precipitation from winter storms, including atmospheric rivers. Warm INPs, those that initiate freezing at temperatures warmer than −10 ∘C, are thought be particularly impactful because they can create primary ice in mixed-phase clouds, enhancing efficiency. The dominant sources warm INPs during rivers, role meteorology modulating transport injection into river impact on cloud...
Abstract. Rainfall intensity–duration (ID) thresholds are commonly used to assess flash flood potential downstream of burned watersheds. High-intensity and/or long-duration rainfall is required generate floods as landscapes recover from fire, but there little guidance on how change a function time since fire. Here, we force hydrological model with radar-derived precipitation estimate ID for post-fire in 41.5 km2 watershed southern California, USA. Prior work this study area constrains...
The spatial and temporal evolution of Middle East southwest Asia (MESW) precipitation characteristics the associated atmospheric circulation during times in which tropical eastern Indian Ocean is either enhanced or reduced with Madden–Julian oscillation (MJO) assessed. Using multiple estimates both observed MJO 1981–2016, MESW throughout November–April examined terms monthly accumulation on days, number extreme days. phases 2–4, enhanced, 6–8, reduced, are related, significant decreases...
Abstract Despite numerous studies documenting the importance of atmospheric rivers (AR) to global water cycle and regional precipitation, evolution their vapor fluxes has been difficult investigate given challenges observing modeling precipitation processes within ARs over ocean. This study uses satellite-based radar reflectivity profiles from Global Precipitation Measurement Dual-Frequency Radar (GPM-DPR), combined with kinematic thermodynamic conditions in vicinity diagnosed Climate...