Alex Hall

Professor

Department of Atmospheric and Oceanic Sciences


Atmos & Ocean Sci
7955 MSB
Los Angeles, CA 90095

Center for Climate Science

Climate Sensitivity Research Lounge

Department of Atmospheric and Oceanic Sciences

Curriculum Vitae

Bio

Alex Hall is Professor in the Department of Atmospheric and Oceanic Sciences and Institute of the Environment and Sustainability and Director of the Center for Climate Science at UCLA. His research is focused on reducing climate change uncertainty at both regional and global scales.

At the regional scale, he has been active in the development of downscaling techniques to understand climate change at the scales most relevant to people and ecosystems. Alex and his team at the Center for Climate Science use these techniques to create neighborhood-scale projections of future climate. They have recently completed downscaling studies over the Los Angeles region and the Sierra Nevada, and projects are currently under way to investigate the future of extreme precipitation and fire in California.

Alex was a Lead Author of the Intergovernmental Panel on Climate Change 5th Assessment Report’s chapter on regional climate change and a Contributing Author to its chapter on climate model evaluation. In 2016, he received the American Geophysical Union’s Atmospheric Sciences Ascent Award.

Projects

Los Angeles Regional Climate Assessment

Since 2006, the State of California has undertaken periodic scientific assessments with the goal of understanding future climate change impacts on the state. For the first three such assessments, released in 2006, 2009, and 2012, a portfolio of research projects investigated climate change impacts, and the assessment report described the results of these studies. The...

The Future of California Drought, Fire, and Forest Dieback

In this project, we at the Center for Climate Science are using climate, vegetation, and fire observations and models to answer critical questions for California's future: Under climate change, what will happen to forests? How will fire risk change? How will climate, forest, and fire changes interact with and exacerbate one another — and what can we do to prepare?

The Future of Extreme Precipitation in California

Our researchers are investigating the effects of climate change on heavy precipitation events in the state. Specifically, we're focusing on atmospheric rivers, moisture-laden filaments of air that move across oceans and produce heavy precipitation when they make landfall. Understanding how atmospheric rivers are affected in a changing climate is key to smart water planning in the future.

Developing Metrics to Evaluate the Skill and Credibility of Downscaling

Within the climate science community, a variety of techniques are used to "downscale" information from global climate models and produce fine-scale projections of future climate, but the relative strengths and weaknesses of these techniques are not well-understood. In this project, we are comparing downscaling techniques and establishing best practices.

Publications

Anthropogenic Warming Impacts on Today’s Sierra Nevada Snowpack and Flood Risk

X. Huang, A. Hall, and N. Berg

Published Work | 2018 | Geophysical Research Letters


Increasing precipitation volatility in twenty-first-century California

D.L. Swain, B. Langenbrunner, J.D. Neelin, and A. Hall

Published Work | 2018 | Nature Climate Change


Climate Change in the Sierra Nevada: California’s Water Future

K.D. Reich, N. Berg, D.B. Walton, M. Schwartz, F. Sun, X. Huang, and A. Hall

Other | 2018


Significant and inevitable end-of-21st-century advances in surface runoff timing in California’s Sierra Nevada

M. Schwartz, A. Hall, F. Sun, D.B. Walton, and N. Berg

Published Work | 2017 | Journal of Hydrometeorology


Anthropogenic Warming Impacts on California Snowpack During Drought

N. Berg and A. Hall

Published Work | 2017 | Geophysical Research Letters


Incorporating Snow Albedo Feedback Into Downscaled Temperature and Snow Cover Projections for California’s Sierra Nevada

D.B. Walton, A. Hall, N. Berg, M. Schwartz, F. Sun

Published Work | 2017 | Journal of Climate


21st-century snowfall and snowpack changes in the Southern California mountains

F. Sun, A. Hall, M. Schwartz, D.B. Walton, and N. Berg

Published Work | 2016 | Journal of Climate


Mid 21st-century precipitation changes over the Los Angeles region

N. Berg, A. Hall, F. Sun, S.C. Capps, D.B. Walton, B, Langenbrunner, and J.D. Neelin

Published Work | 2015 | Journal of Climate


Increased interannual precipitation extremes over California under climate change

N. Berg, A. Hall

Published Work | 2015 | Journal of Climate


California winter precipitation change under global warming in the Coupled Model Intercomparison Project 5 ensemble

J.D. Neelin, B. Langenbrunner, J.E. Meyerson, A. Hall, and N. Berg

Published Work | 2013 | Journal of Climate


El Niño–Southern Oscillation impacts on winter winds over Southern California

N. Berg, A. Hall, S.B. Capps, and M. Hughes

Published Work | 2013 | Climate Dynamics


California Winter Precipitation Change under Global Warming in the Coupled Model Intercomparison Project Phase 5 Ensemble

David Neelin, Baird Langenbrunner, Joyce Meyerson, Alex Hall, Neil Berg

Published Work | 2013 | American Meteorological Society


El Nio-Southern Oscillation impacts on winter winds over Southern California

Neil Berg, Alex Hall, Scott Capps, Mimi Hughes

Published Work | Journal of Climate Dynamics



Accumulation and melt dynamics of snowpack from a multiresolution regional climate model in the central Sierra Nevada, California

T. Pavelsky, S. Kapnick, A. Hall

Published Work | Journal of Geophysical Research-Atmospheres



A Hybrid Dynamical-Statistical Downscaling Technique, Part I: Development and Validation of the Technique.

D.B. Walton, F. Sun, A. Hall, and S.C. Capps

Published Work | Journal of Climate