A5017147882- Climate variability and models
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Climate change and permafrost
- Fire effects on ecosystems
- Arctic and Antarctic ice dynamics
- Atmospheric aerosols and clouds
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Plant Water Relations and Carbon Dynamics
- Astronomy and Astrophysical Research
- Atmospheric chemistry and aerosols
- Hydrology and Drought Analysis
- Landslides and related hazards
- Flood Risk Assessment and Management
- Solar Radiation and Photovoltaics
- Atmospheric Ozone and Climate
- Geology and Paleoclimatology Research
- Climate change impacts on agriculture
- Geophysics and Gravity Measurements
- Aeolian processes and effects
- Methane Hydrates and Related Phenomena
- Tree-ring climate responses
University of California, Los Angeles
2016-2025
Creighton University
2025
Environmental Protection Agency
2024
University of Edinburgh
2009-2023
Lawrence Berkeley National Laboratory
2023
Stony Brook University
2023
State University of New York
2023
Scripps Institution of Oceanography
2023
NSF National Center for Atmospheric Research
2023
University of California, San Diego
2023
Abstract Processes in the climate system that can either amplify or dampen response to an external perturbation are referred as feedbacks. Climate sensitivity estimates depend critically on radiative feedbacks associated with water vapor, lapse rate, clouds, snow, and sea ice, global of these differ among general circulation models. By reviewing recent observational, numerical, theoretical studies, this paper shows there has been progress since Third Assessment Report Intergovernmental Panel...
Zonally symmetric fluctuations of the midlatitude westerly winds characterize primary mode atmospheric variability in Southern Hemisphere during all seasons. This is true not only observations but also an unforced 15 000-yr integration a coarse-resolution (R15) coupled ocean–atmosphere model. Here it documented how this variability, known as Annular Mode (SAM), generates ocean circulation and sea ice variations model on interannual to centennial timescales that are tightly phase with SAM....
A coarse resolution coupled ocean–atmosphere simulation in which surface albedo feedback is suppressed by prescribing albedo, compared to one where snow and sea ice anomalies are allowed affect albedo. Canonical CO2-doubling experiments were performed with both models assess the impact of this on equilibrium response external forcing. It accounts for about half high-latitude Both also run 1000 yr without forcing internal variability. Surprisingly little variability can be attributed...
Differences in simulations of climate feedbacks are sources significant divergence models' temperature response to anthropogenic forcing. Snow albedo feedback is particularly critical for change prediction heavily‐populated northern hemisphere land masses. Here we show its strength current models exhibits a factor‐of‐three spread. These large intermodel variations nearly perfectly correlated with comparably the context seasonal cycle. Moreover, real cycle can be measured and compared...
Abstract In this study, uncoupled and coupled ocean–atmosphere simulations are carried out for the California Upwelling System to assess dynamic interactions, namely, ocean surface current feedback atmosphere. The authors show feedback, by modulating energy transfer from atmosphere ocean, controls oceanic eddy kinetic (EKE). For first time, it is demonstrated that has an effect on stress a counteracting wind itself. acts as killer, reducing half EKE, 27% depth-integrated EKE. On one hand,...
Abstract. This paper describes ESM-SnowMIP, an international coordinated modelling effort to evaluate current snow schemes, including schemes that are included in Earth system models, a wide variety of settings against local and global observations. The project aims identify crucial processes characteristics need be improved models the context local- global-scale modelling. A further objective ESM-SnowMIP is better quantify snow-related feedbacks system. Although it not part sixth phase...
Abstract Differences in simulations of tropical marine low‐cloud cover (LCC) feedback are sources significant spread temperature responses climate models to anthropogenic forcing. Here we show that the is mainly driven by three large‐scale changes—a strengthening inversion, increasing surface latent heat flux, and an vertical moisture gradient. Variations LCC response these changes alone account for most model‐projected 21st century changes. A methodology devised constrain observationally...
ABSTRACT Regional climate modeling addresses our need to understand and simulate climatic processes phenomena unresolved in global models. This paper highlights examples of current approaches innovative uses regional that deepen understanding the system. High-resolution models are generally more skillful simulating extremes, such as heavy precipitation, strong winds, severe storms. In addition, research has shown fine-scale features mountains, coastlines, lakes, irrigation, land use, urban...
Previous studies have identified a recent increase in wildfire activity the western United States (WUS). However, extent to which this trend is due weather pattern changes dominated by natural variability versus anthropogenic warming has been unclear. Using an ensemble constructed flow analogue approach, we employed observations estimate vapor pressure deficit (VPD), leading meteorological variable that controls wildfires, associated with different atmospheric circulation patterns. Our...
We describe and benchmark a new quantum charge-coupled device (QCCD) trapped-ion computer based on linear trap with periodic boundary conditions, which resembles race track. The system successfully incorporates several technologies crucial to future scalability—including electrode broadcasting, multilayer rf routing, magneto-optical (MOT) loading—while maintaining, in some cases exceeding, the gate fidelities of previous QCCD systems. is initially operated 32 qubits, but upgrades will allow...
Precipitation extremes will likely intensify under climate change. However, much uncertainty surrounds intensification of high-magnitude events that are often inadequately resolved by global models. In this analysis, we develop a framework involving targeted dynamical downscaling historical and future extreme precipitation produced large ensemble model. This is applied to "atmospheric river" storms in California. We find substantial (10 40%) increase total accumulated precipitation, with the...
The intensification of extreme precipitation under anthropogenic forcing is robustly projected by global climate models, but highly challenging to detect in the observational record. Large internal variability distorts this signal. Models produce diverse magnitudes response forcing, largely due differing schemes for parameterizing subgrid-scale processes. Meanwhile, multiple datasets daily exist, developed using varying techniques and inhomogeneously sampled data space time. Previous...
Abstract The strength of snow-albedo feedback (SAF) in transient climate change simulations the Fourth Assessment Intergovernmental Panel on Climate Change is generally determined by surface-albedo decrease associated with a loss snow cover rather than reduction albedo due to metamorphosis warming climate. large intermodel spread SAF likewise attributable mostly component. this component turn correspondingly mean effective albedo. Models albedos have contrast between snow-covered and...