The present paper describes the Variability of the American Monsoon Systems (VAMOS) Ocean–Cloud–Atmosphere–Land Study (VOCALS), an international research program focused on the improved understanding and modeling of the southeastern Pacific (SEP) climate system on diurnal to interannual time scales. In the framework of the SEP climate, VOCALS has two fundamental objectives: 1) improved simulations by coupled atmosphere–ocean general circulation models (CGCMs), with an emphasis on reducing systematic errors in the region; and 2) improved estimates of the indirect effects of aerosols on low clouds and climate, with an emphasis on the more precise quantification of those effects. VOCALS major scientific activities are outlined, and selected achievements are highlighted. Activities described include monitoring in the region, a large international field campaign (the VOCALS Regional Experiment), and two model assessments. The program has already produced significant advances in the understanding of major issues in the SEP: the coastal circulation and the diurnal cycle, the ocean heat budget, factors controlling precipitation and formation of pockets of open cells in stratocumulus decks, aerosol impacts on clouds, and estimation of the first aerosol indirect effect. The paper concludes with a brief presentation on VOCALS contributions to community capacity building before a summary of scientific findings and remaining questions.
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Ocean–Cloud–Atmosphere–Land Interactions in the Southeastern Pacific: The VOCALS Program
C. R. Mechoso
C. R. Mechoso
Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California
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R. Wood
R. Wood
Department of Atmospheric Sciences, University of Washington, Seattle, Washington
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R. Weller
R. Weller
Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts
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C. S. Bretherton
C. S. Bretherton
Department of Atmospheric Sciences, University of Washington, Seattle, Washington
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A. D. Clarke
A. D. Clarke
Department of Oceanography, University of Hawai‘i at Mãnoa, Honolulu, Hawaii
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H. Coe
H. Coe
School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, United Kingdom
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C. Fairall
C. Fairall
NOAA/Earth System Research Laboratory, Boulder, Colorado
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J. T. Farrar
J. T. Farrar
Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts
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G. Feingold
G. Feingold
NOAA/Earth System Research Laboratory, Boulder, Colorado
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R. Garreaud
R. Garreaud
Department of Geophysics, and Center for Climate and Resilience Research, Universidad de Chile, Santiago, Chile
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C. Grados
C. Grados
Instituto del Mar del Perú, Circuito-Callao, Peru
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J. McWilliams
J. McWilliams
Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, California
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S. P. de Szoeke
S. P. de Szoeke
College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, Oregon
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S. E. Yuter
S. E. Yuter
Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina
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P. Zuidema
P. Zuidema
Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida
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Displayed acceptance dates for articles published prior to 2023 are approximate to within a week. If needed, exact acceptance dates can be obtained by emailing amsjol@ametsoc.org.
The present paper describes the Variability of the American Monsoon Systems (VAMOS) Ocean–Cloud–Atmosphere–Land Study (VOCALS), an international research program focused on the improved understanding and modeling of the southeastern Pacific (SEP) climate system on diurnal to interannual time scales. In the framework of the SEP climate, VOCALS has two fundamental objectives: 1) improved simulations by coupled atmosphere–ocean general circulation models (CGCMs), with an emphasis on reducing systematic errors in the region; and 2) improved estimates of the indirect effects of aerosols on low clouds and climate, with an emphasis on the more precise quantification of those effects. VOCALS major scientific activities are outlined, and selected achievements are highlighted. Activities described include monitoring in the region, a large international field campaign (the VOCALS Regional Experiment), and two model assessments. The program has already produced significant advances in the understanding of major issues in the SEP: the coastal circulation and the diurnal cycle, the ocean heat budget, factors controlling precipitation and formation of pockets of open cells in stratocumulus decks, aerosol impacts on clouds, and estimation of the first aerosol indirect effect. The paper concludes with a brief presentation on VOCALS contributions to community capacity building before a summary of scientific findings and remaining questions.
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