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Discussion papers
https://doi.org/10.5194/acp-2020-67
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-67
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Feb 2020

Submitted as: research article | 04 Feb 2020

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This preprint is currently under review for the journal ACP.

Cloud Regimes Over the Amazon Basin: Perspectives From the GoAmazon2014/5 Campaign

Scott E. Giangrande1, Dié Wang1, and David B. Mechem2 Scott E. Giangrande et al.
  • 1Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, USA
  • 2Department of Geography and Atmospheric Science, University of Kansas, Lawrence, Kansas, USA

Abstract. Radiosonde launches collected during the GoAmazon2014/5 campaign are analyzed to identify the primary thermodynamic regimes accompanying different modes of convection over the Amazon. This analysis identifies five thermodynamic regimes that are consistent with traditional Amazon calendar definitions for seasonal shifts, which include a wet, transitional, and three dry-season clusters. A multisensor ground-based approach is used to project associated bulk cloud and precipitation properties onto these regimes to assess the propensity for each regime for characteristic cloud frequency, cloud types, and precipitation properties. Additional emphasis is given to those regimes that promote deep convective precipitation and organized convective systems. Overall, we find reduced cloud cover and precipitation rates to be associated with the driest regimes and those with the highest convective inhibition CIN. While approximately 15 % of the dataset is designated as organized convection, these events are predominantly contained within transitional regime days.

Scott E. Giangrande et al.

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Scott E. Giangrande et al.

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Latest update: 18 Feb 2020
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Short summary
The Amazon basin experiences prolific and diverse cloud conditions that are strongly influenced by (and influencing, via feedbacks) seasonal shifts in the local conditions, and larger-scale atmospheric circulations. The primary atmospheric regimes observed during a heavily-instrumented two-year Amazon deployment are classified. We assess the potential atmospheric controls on convective clouds, precipitation, and the propensity for these regimes to promote extremes in precipitation.
The Amazon basin experiences prolific and diverse cloud conditions that are strongly influenced...
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