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Lee, Myong-In
Climate-Environment Modeling Lab
Research Interests
  • Climate Change, Seasonal Prediction, Extreme Weather, Aerosol

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Simulations of the 2004 North American Monsoon: NAMAP2

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Title
Simulations of the 2004 North American Monsoon: NAMAP2
Author
Gutzler, D. S.Long, L. N.Schemm, J.Roy, S. BaidyaBosilovich, M.Collier, J. C.Kanamitsu, M.Kelly, P.Lawrence, D.Lee, Myong-InLobato Sanchez, R.Mapes, B.Mo, K.Nunes, A.Ritchie, E. A.Roads, J.Schubert, S.Wei, H.Zhang, G. J.
Keywords
Circulation anomalies; Diurnal cycle; Global models; Gulf of California; Higher resolution; Lateral boundary conditions; Low level jet; Lower boundary conditions; Me-xico; Model assessment; Model simulation; Monsoon onset; Monsoonal precipitation; North American; North american monsoon experiments; Observational analysis; Ocean surface temperature; Regional model; Second phase; Surface turbulent fluxes; Time varying; Total precipitation; Warm season precipitation; Warm seasons
Issue Date
2009-12
Publisher
AMER METEOROLOGICAL SOC
Citation
JOURNAL OF CLIMATE, v.22, no.24, pp.6716 - 6740
Abstract
The second phase of the North American Monsoon Experiment (NAME) Model Assessment Project (NAMAP2) was carried out to provide a coordinated set of simulations from global and regional models of the 2004 warm season across the North American monsoon domain. This project follows an earlier assessment, called NAMAP, that preceded the 2004 field season of the North American Monsoon Experiment. Six global and four regional models are all forced with prescribed, time-varying ocean surface temperatures. Metrics for model simulation of warm season precipitation processes developed in NAMAP are examined that pertain to the seasonal progression and diurnal cycle of precipitation, monsoon onset, surface turbulent fluxes, and simulation of the low-level jet circulation over the Gulf of California. Assessment of the metrics is shown to be limited by continuing uncertainties in spatially averaged observations, demonstrating that modeling and observational analysis capabilities need to be developed concurrently. Simulations of the core subregion (CORE) of monsoonal precipitation in global models have improved since NAMAP, despite the lack of a proper low-level jet circulation in these simulations. Some regional models run at higher resolution still exhibit the tendency observed in NAMAP to overestimate precipitation in the CORE subregion; this is shown to involve both convective and resolved components of the total precipitation. The variability of precipitation in the Arizona/New Mexico (AZNM) subregion is simulated much better by the regional models compared with the global models, illustrating the importance of transient circulation anomalies (prescribed as lateral boundary conditions) for simulating precipitation in the northern part of the monsoon domain. This suggests that seasonal predictability derivable from lower boundary conditions may be limited in the AZNM subregion.
URI
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DOI
10.1175/2009JCLI3138.1
ISSN
0894-8755
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