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Title: Insights into riming and aggregation processes as revealed by aircraft, radar, and disdrometer observations for a 27 April 2011 widespread precipitation event: Insights into Riming and Aggregation

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1002/2015JD024537· OSTI ID:1260164
 [1];  [1];  [2];  [3];  [4];  [4]
  1. Atmospheric Sciences Division, Brookhaven National Laboratory, Upton New York USA
  2. National Center for Atmospheric Research, Boulder Colorado USA
  3. Department of Meteorology, Pennsylvania State University, University Park Pennsylvania USA
  4. Cooperative Institute for Mesoscale Meteorological Studies, University of Oklahoma and NOAA/National Severe Storms Laboratory, Norman Oklahoma USA

Abstract This study presents aircraft spiral ascent and descent observations intercepting a transition to riming processes during widespread stratiform precipitation. The sequence is documented using collocated scanning and profiling radar, including longer‐wavelength dual polarization measurements and shorter‐wavelength Doppler spectra. Riming regions are supported using aircraft measurements recording elevated liquid water concentrations, spherical particle shapes, and saturation with respect to water. Profiling cloud radar observations indicate riming regions during the event as having increasing particle fall speeds, rapid time‐height changes, and bimodalities in Doppler spectra. These particular riming signatures are coupled to scanning dual polarization radar observations of higher differential reflectivity ( Z DR ) aloft. Reduced melting layer enhancements and delayed radar bright‐band signatures in the column are also observed during riming periods, most notably with the profiling radar observations. The bimodal cloud radar Doppler spectra captured near riming zones indicate two time‐height spectral ice peaks, one rimed particle peak, and one peak associated with pristine ice needle generation and/or growth between −4°C and −7°C also sampled by aircraft probes. This pristine needle population gives a partial explanation for the enhanced Z DR we observe near this rimed particle region. The riming signatures aloft and radar measurements within the melting level are weakly lag correlated ( r ~0.6) with smaller median drop sizes at the surface, as compared with later times when aggregation of larger particle sizes was believed dominant.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC00112704; DE‐SC0008648
OSTI ID:
1260164
Alternate ID(s):
OSTI ID: 1402202
Report Number(s):
BNL-112320-2016-JA; R&D Project: 2016-BNL-EE630EECA-Budg; KP1701000
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 121, Issue 10; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (6)

Global Positioning System precipitable water vapour (GPS-PWV) jumps before intense rain events: A potential application to nowcasting journal November 2018
Electrification in Mesoscale Updrafts of Deep Stratiform and Anvil Clouds in Florida journal January 2019
Inadvertent Localized Intensification of Precipitation by Aircraft journal February 2019
A novel approach for characterizing the variability in mass–dimension relationships: results from MC3E journal January 2019
Global Positioning System precipitable water vapor (GPS-PWV) jumps before intense rain events: A potential application to nowcasting text January 2018
The Green Ocean: precipitation insights from the GoAmazon2014/5 experiment journal January 2018

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