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Title: On the role of aerosols, humidity, and vertical wind shear in the transition of shallow-to-deep convection at the Green Ocean Amazon 2014/5 site

Abstract

Here, the preconditioning of the atmosphere for a shallow-to-deep convective transition during the dry-to-wet season transition period (August–November)is investigated using Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) GoAmazon2014/5 campaign data from March 2014 to November 2015 in Manacapuru, Brazil. In comparison to conditions observed prior to shallow convection, anomalously high humidity in the free troposphere andboundary layer is observed prior to a shallow-to-deep convection transition.An entraining plume model, which captures this leading dependence on lower tropospheric moisture, is employed to study indirect thermodynamic effects associated with vertical wind shear (VWS) and cloud condensation nuclei (CCN)concentration on preconvective conditions. The shallow-to-deep convective transition primarily depends on humidity, especially that from the free troposphere, which tends to increase plume buoyancy. Conditions preceding deep convection are associated with high relative humidity, and low-to-moderate CCN concentration (less than the 67th percentile,1274cm –3). VWS, however, shows little relation to moisture and plume buoyancy. Buoyancy estimates suggest that the latent heat release due to freezing is important to deep convective grow thunder all conditions analyzed, consistent with potential pathways for aerosol effects, even in the presence of a strong entrainment. Shallow-only convective growth, however, shows an association with a strong (weak) low(deep) level VWS andmore » with higher CCN concentration.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [1]
  1. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States); Univ. of Texas at Austin, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1502116
Grant/Contract Number:  
[SC0011074; SC0011117]
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
[Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 18; Journal Issue: 15]; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Chakraborty, Sudip, Schiro, Kathleen A., Fu, Rong, and Neelin, J. David. On the role of aerosols, humidity, and vertical wind shear in the transition of shallow-to-deep convection at the Green Ocean Amazon 2014/5 site. United States: N. p., 2018. Web. doi:10.5194/acp-18-11135-2018.
Chakraborty, Sudip, Schiro, Kathleen A., Fu, Rong, & Neelin, J. David. On the role of aerosols, humidity, and vertical wind shear in the transition of shallow-to-deep convection at the Green Ocean Amazon 2014/5 site. United States. doi:10.5194/acp-18-11135-2018.
Chakraborty, Sudip, Schiro, Kathleen A., Fu, Rong, and Neelin, J. David. Fri . "On the role of aerosols, humidity, and vertical wind shear in the transition of shallow-to-deep convection at the Green Ocean Amazon 2014/5 site". United States. doi:10.5194/acp-18-11135-2018. https://www.osti.gov/servlets/purl/1502116.
@article{osti_1502116,
title = {On the role of aerosols, humidity, and vertical wind shear in the transition of shallow-to-deep convection at the Green Ocean Amazon 2014/5 site},
author = {Chakraborty, Sudip and Schiro, Kathleen A. and Fu, Rong and Neelin, J. David},
abstractNote = {Here, the preconditioning of the atmosphere for a shallow-to-deep convective transition during the dry-to-wet season transition period (August–November)is investigated using Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) GoAmazon2014/5 campaign data from March 2014 to November 2015 in Manacapuru, Brazil. In comparison to conditions observed prior to shallow convection, anomalously high humidity in the free troposphere andboundary layer is observed prior to a shallow-to-deep convection transition.An entraining plume model, which captures this leading dependence on lower tropospheric moisture, is employed to study indirect thermodynamic effects associated with vertical wind shear (VWS) and cloud condensation nuclei (CCN)concentration on preconvective conditions. The shallow-to-deep convective transition primarily depends on humidity, especially that from the free troposphere, which tends to increase plume buoyancy. Conditions preceding deep convection are associated with high relative humidity, and low-to-moderate CCN concentration (less than the 67th percentile,1274cm–3). VWS, however, shows little relation to moisture and plume buoyancy. Buoyancy estimates suggest that the latent heat release due to freezing is important to deep convective grow thunder all conditions analyzed, consistent with potential pathways for aerosol effects, even in the presence of a strong entrainment. Shallow-only convective growth, however, shows an association with a strong (weak) low(deep) level VWS and with higher CCN concentration.},
doi = {10.5194/acp-18-11135-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = [15],
volume = [18],
place = {United States},
year = {2018},
month = {8}
}

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    Works referencing / citing this record:

    Mesoscale convective systems over the Amazon basin: The GoAmazon2014/5 program
    journal, June 2019

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