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Title: Three-Moment Representation of Rain in a Bulk Microphysics Model

Abstract

A bulk three-moment representation for rain microphysics is developed and implemented in the Predicted Particle Properties (P3) microphysics scheme. In addition, a new parameterization for rain self-collection and collisional breakup (RSCB) is presented using a lookup table approach, based on the Spectral Bin Model (SBM). To quantify the impacts of sedimentation, evaporation, and RSCB on drop size distributions (DSDs), a rainshaft model is applied to a wide range of atmospheric scenarios (i.e., initial conditions and regimes) and compared against results from the SBM. DSD shapes are mainly determined by both sedimentation and evaporation, except in heavy rain where the impact of RSCB on DSD shape becomes more important than evaporation. The new parameterization for RSCB has a considerable impact on the mean drop size, improving the agreement between P3 and SBM. Only 4% of the original two-moment rainshaft simulations have mean drop sizes and rain rates within ?20% of the SBM results, but this increases to more than 95% agreement when the three-moment rain representation is used together with the new parameterization for RSCB. Generally, the improvement is more significant for heavy rain than for light drizzle. Furthermore, remaining differences between bin and bulk model are attributable to treatments ofmore » evaporation, and the restriction to gamma DSDs in P3.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [4]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. National Center for Atmospheric Research, Boulder, CO (United States)
  3. Environment and Climate Change Canada, Dorval, QC (Canada)
  4. Hebrew Univ. of Jerusalem, Jerusalem (Israel)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1491916
Alternate Identifier(s):
OSTI ID: 1491917; OSTI ID: 1502406
Report Number(s):
PNNL-SA-138435
Journal ID: ISSN 1942-2466
Grant/Contract Number:  
AC05-76RL01830; 68928
Resource Type:
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Bulk Microphysics Model; three-moment representation; rain self-collection and collisional breakup (RSCB); precipitation; three‐moment scheme; size sorting; evaporation; self‐collection; breakup

Citation Formats

Paukert, Marco, Fan, Jiwen, Rasch, Philip J., Morrison, H., Milbrandt, J. A., Shpund, J., and Khain, A. Three-Moment Representation of Rain in a Bulk Microphysics Model. United States: N. p., 2018. Web. doi:10.1029/2018MS001512.
Paukert, Marco, Fan, Jiwen, Rasch, Philip J., Morrison, H., Milbrandt, J. A., Shpund, J., & Khain, A. Three-Moment Representation of Rain in a Bulk Microphysics Model. United States. doi:10.1029/2018MS001512.
Paukert, Marco, Fan, Jiwen, Rasch, Philip J., Morrison, H., Milbrandt, J. A., Shpund, J., and Khain, A. Wed . "Three-Moment Representation of Rain in a Bulk Microphysics Model". United States. doi:10.1029/2018MS001512.
@article{osti_1491916,
title = {Three-Moment Representation of Rain in a Bulk Microphysics Model},
author = {Paukert, Marco and Fan, Jiwen and Rasch, Philip J. and Morrison, H. and Milbrandt, J. A. and Shpund, J. and Khain, A.},
abstractNote = {A bulk three-moment representation for rain microphysics is developed and implemented in the Predicted Particle Properties (P3) microphysics scheme. In addition, a new parameterization for rain self-collection and collisional breakup (RSCB) is presented using a lookup table approach, based on the Spectral Bin Model (SBM). To quantify the impacts of sedimentation, evaporation, and RSCB on drop size distributions (DSDs), a rainshaft model is applied to a wide range of atmospheric scenarios (i.e., initial conditions and regimes) and compared against results from the SBM. DSD shapes are mainly determined by both sedimentation and evaporation, except in heavy rain where the impact of RSCB on DSD shape becomes more important than evaporation. The new parameterization for RSCB has a considerable impact on the mean drop size, improving the agreement between P3 and SBM. Only 4% of the original two-moment rainshaft simulations have mean drop sizes and rain rates within ?20% of the SBM results, but this increases to more than 95% agreement when the three-moment rain representation is used together with the new parameterization for RSCB. Generally, the improvement is more significant for heavy rain than for light drizzle. Furthermore, remaining differences between bin and bulk model are attributable to treatments of evaporation, and the restriction to gamma DSDs in P3.},
doi = {10.1029/2018MS001512},
journal = {Journal of Advances in Modeling Earth Systems},
number = 1,
volume = 11,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1029/2018MS001512

Figures / Tables:

Table 1 Table 1: Overview of the 450 Scenarios Simulated in the Rainshaft Model

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