Title: Drop Size Distribution Variability in Central Argentina during RELAMPAGO-CACTI

Abstract

The Remote sensing of Electrification, Lightning, And Meso-scale/micro-scale Processes with Adaptive Ground Observations (RELAMPAGO) and the Cloud, Aerosol, and Complex Terrain Interactions Experiment Proposal (CACTI) field campaigns provided an unprecedented thirteen-disdrometer dataset in Central Argentina during the Intensive (IOP, 15 November to 15 December 2018) and Extended (EOP, 15 October 2018 to 30 April 2019) Observational Periods. The drop size distribution (DSD) parameters and their variability were analyzed across the region of interest, which was divided into three subregions characterized by the differing proximity to the Sierras de Córdoba (SDC), in order to assess the impact of complex terrain on the DSD parameters. A rigorous quality control of the data was first performed. The frequency distributions of DSD-derived parameters were analyzed, including the normalized intercept parameter (logN_w), the mean volume diameter (D₀), the mean mass diameter (D_m), the shape parameter (μ), the liquid water content (LWC), and the rain rate (R). The region closest to the SDC presented higher values of logN_w, lower D₀, and higher μ, while the opposite occurred in the farthest region, i.e., the concentration of small drops decreased while the concentration of bigger drops increased with the distance to the east of the SDC. Furthermore, themore » region closest to the SDC showed a bimodal distribution of D₀: the lower values of D₀ were associated with higher values of logN_w and were found more frequently during the afternoon, while the higher D₀ were associated with lower logN_w and occurred more frequently during the night. The data were analyzed in comparison to the statistical analysis of Dolan et al. 2018 and sorted according to the classification proposed in the cited study. The logN_w-D₀ and LWC-D₀ two-dimensional distributions allowed further discussion around the applicability of other mid-latitude and global precipitation classification schemes (startiform/convection) in the region of interest. Finally, three precipitation case studies were analyzed with supporting polarimetric radar data in order to relate the DSD characteristics to the precipitation type and the microphysical processes involved in each case.« less

Authors:

Casanovas, Candela ^[1]; Salio, Paola  ^[1];

• Search DOE PAGES for author "Salio, Paola"
• Search DOE PAGES for ORCID "0000-0002-9221-7906"

Galligani, Victoria  ^[2];

• Search DOE PAGES for author "Galligani, Victoria"
• Search DOE PAGES for ORCID "0000-0002-2626-6187"

Dolan, Brenda ^[3]; Nesbitt, Stephen W.  ^[4]

• Search DOE PAGES for author "Nesbitt, Stephen W."
• Search DOE PAGES for ORCID "0000-0003-0348-0452"

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+ Show Author Affiliations

1. Univ. of Buenos Aires (Argentina); Centro de Investigaciones del Mar y la Atmosfera (CIMA), Buenos Aires (Argentina); Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (IFAECI), Buenos Aires (Argentina)
2. Centro de Investigaciones del Mar y la Atmosfera (CIMA), Buenos Aires (Argentina); Instituto Franco-Argentino para el Estudio del Clima y sus Impactos (IFAECI), Buenos Aires (Argentina)
3. Colorado State Univ., Fort Collins, CO (United States)
4. Univ. of Illinois at Urbana-Champaign, IL (United States)

Publication Date:

Fri May 21 00:00:00 EDT 2021

Research Org.:

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center

Sponsoring Org.:

USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)

OSTI Identifier:

1787976

Grant/Contract Number:  

AC06-76RL01830; AGS-1661799

Resource Type:

Accepted Manuscript

Journal Name:

Remote Sensing

Additional Journal Information:

Journal Volume: 13; Journal Issue: 11; Journal ID: ISSN 2072-4292

Publisher:

MDPI

Country of Publication:

United States

Language:

English

Subject:

54 ENVIRONMENTAL SCIENCES; DSD; drop size distribution; precipitation; complex terrain