Lawrence Livermore National Laboratory

Hsi-Yen Ma

Research Scientist
Atmospheric, Earth and Energy Division

 +1 925-422-5958

University of California, Los Angeles
University of California, Los Angeles
National Taiwan University

Research Interests

Climate Modeling: Global and regional climate modeling, sub-grid scale parameterizations of atmospheric convection, clouds, planetary boundary layer, and land surface processes

Coupled Atmosphere-Ocean-Land interactions: Understand the interactions and feedback processes between atmosphere, ocean and land surface

Climate Variability: Understand the global climate variability from diurnal to decadal time scales based on both observations and model experiments

Monsoon Climate: Understand the variability and predictability of monsoon flows and precipitation, and their interactions with general circulation from diurnal cycle to decadal time scales, especially for the South American Monsoon System

Honors and Awards

  • University Fellowship, 2007-2009, UCLA

Selected (Recent) Publications

N. P. Klingaman, S. J. Woolnough, X. Jiang, D. Waliser, P. K. Xavier, J. Petch, M. Caian, C. Hannay, D. Kim, H.-Y. Ma, W. J. Merryfield, T. Miyakawa, M. Pritchard, J. A. Ridout, R. Roehrig, E. Shindo, F. Vitart, H. Wang, N. R. Cavanaugh, B. E. Mapes, A. Shelly, G. Zhang, 2014: Vertical structure and diabatic processes of the Madden-Julian oscillation: Linking hindcast fidelity to simulated diabatic heating and moistening. In Preparation.

Li, J.-L. F., S. Lee, D. E. Waliser, M. Lebsock, G. Stephens, B. Guan, M. Christensen, J. Teixeira, H.-Y. Ma, 2014: Assessment of cloud liquid water from climate models and reanalyses using satellite observations. In Preparation.

Ma, H.-Y., S. Xie, S. A. Klein, K. D. Williams, J. S. Boyle, S. Bony, H. Douville, S. Fermepin, B. Medeiros, S. Tyteca, M. Watanabe, and D. L. Williamson, 2014: On the correspondence between mean forecast errors and climate errors in CMIP5 models. J. Climate, 27, 1781–1798.

Ma, H.-Y., H. Xiao, C. R. Mechoso, Y. Xue, J. D. Neelin, and X. Ji, 2013: On the connection between continental-scale land surface processes and the tropical climate in a coupled ocean-atmosphere-land system. J. Climate, 26, 9006–9025.

Lo, M.-H., C.-M. Wu, H.-Y. Ma, and J. S. Famiglietti, 2013: The response of coastal stratocumulus clouds to agricultural irrigation in California. J. Geophys. Res. Atmos., 118, doi: 10.1002/jgrd.50516.

Li, J.-L. F., D. E. Waliser, G. Stephens, S. Lee, T. L'Ecuyer, S. Kato, N. Loeb, and H.-Y. Ma, 2013: Characterizing and understanding radiation budget biases in CMIP3/CMIP5 GCMs, contemporary GCM, and reanalysis. J. Geophys. Res. Atmos, 118, 8166–8184, doi: 10.1002/jgrd.50378.

Ma, H.-Y., H. Xiao, C. R. Mechoso, Y. Xue, 2012: Sensitivity of global tropical climate to land surface processes: Mean state and interannual variability. J. Climate, 26, 1818–1837.doi:

Ma, H.-Y., S. Xie, J. S. Boyle, S. A. Klein, and Y. Zhang, 2012: Metrics and diagnostics for precipitation-related processes in climate model short-range hindcasts. J. Climate, 26, 1516–1534. doi:

Xie, S., H.-Y. Ma, J. S. Boyle, S. A. Klein, and Y. Zhang, 2012: On the correspondence between short- and long- timescale systematic errors in CAM4/CAM5 for the Years of Tropical Convection. J. Climate, 25, 7937–7955.

Li, J.-L. F., D. E. Waliser, W.-T. Chen, B. Guan, T. Kubar, G. Stephens, H.-Y. Ma, D. Ming, L. Donner, C. Seman, and L. Horowitz, 2012: An observationally based evaluation of cloud ice water in CMIP3 and CMIP5 GCMs and contemporary reanalyses using contemporary satellite data. J. Geophys. Res., 117, D16105, doi:10.1029/2012JD017640.

Xiao H., C.-M. Wu, C. R. Mechoso, and H.-Y. Ma, 2012: A treatment for the stratocumulus-to-cumulus transition in GCMs. Clim. Dyn. doi: 10.1007/s00382-012-1342-z.

Ma, H.-Y., M. Köhler, J.-L. Li, J. D. Farrara, C. R. Mechoso, R. Forbes, and D. E. Waliser, 2012: Evaluation of an ice cloud parameterization based on a dynamical-microphysical lifetime concept using CloudSat observations and the ERA-Interim reanalysis. J. Geophys. Res., 117, D05210, doi:10.1029/2011JD016275.

Ma, H.-Y., X. Ji, J. D. Neelin, and C. R. Mechoso 2011: Mechanisms for precipitation variability of the eastern Brazil/SACZ convective margin. J. Climate, 24, 3445-3456.

Ma, H.-Y., C. R. Mechoso, H. Xiao, C.-M. Wu, Y. Xue, and F. De Sales, 2010: Connection between the south Pacific anti-cyclone, Peruvian stratocumulus, and the South American Monsoon System. CLIVAR Exchanges Newsletter, 15, 16-18.

Ma, H.-Y., C. R. Mechoso, Y. Xue, H. Xiao, C.-M. Wu, J.-L. Li, and F. De Sales, 2010: Impact of land surface processes on the South American warm season climate. Clim. Dyn. doi: 10.1007/s00382-010-0813-3.

Losada, T., B. Rodriguez-Fonseca, C. R. Mechoso, and H.-Y. Ma, 2007: Impacts of SST anomalies on the North Atlantic atmospheric circulation: a case study for the northern winter 1995/1996. Clim. Dyn., 29, 807-819.

Ma, H.-Y., and C. R. Mechoso, 2007: Submonthly Variability in the South American Monsoon System. J. Meteor. Soc. Japan, 85A, 395-401.

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