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Title: Cloud-Resolving Model Intercomparison of an MC3E Squall Line Case: Part II. Stratiform Precipitation Properties

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1029/2018JD029596· OSTI ID:1492883
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10];  [11];  [9]; ORCiD logo [4]
  1. School of Atmospheric Sciences, Nanjing University, Nanjing China, Pacific Northwest National Laboratory, Richland WA USA
  2. Pacific Northwest National Laboratory, Richland WA USA
  3. Pacific Northwest National Laboratory, Richland WA USA, Department of Atmospheric Sciences, University of Utah, Salt Lake City UT USA
  4. National Center for Atmospheric Research, Boulder CO USA
  5. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder and NOAA/Earth System Research Laboratory, Boulder CO USA
  6. School of Atmospheric Sciences, Nanjing University, Nanjing China
  7. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson Arizona USA
  8. Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton NY USA
  9. The Institute of the Earth Science, The Hebrew University of Jerusalem, Jerusalem Israel
  10. NOAA/OAR/National Severe Storms Laboratory, Norman OK USA
  11. Meteorological Research Division, Environment and Climate Change Canada, Dorval Canada

In this second part of a cloud microphysics scheme intercomparison study, we focus on biases and variabilities of stratiform precipitation properties for a midlatitude squall line event simulated with a cloud-resolving model implemented with eight cloud microphysics schemes. Most of the microphysics schemes underestimate total stratiform precipitation, mainly due to underestimation of stratiform precipitation area. All schemes underestimate the frequency of moderate stratiform rain rates (2–6 mm/hr), which may result from low-biased ice number and mass concentrations for 0.2–2-mm diameter particles in the stratiform ice region. Most simulations overestimate ice water content (IWC) at altitudes above 7 km for temperatures colder than -20 °C but produce a decrease of IWC approaching the melting level, which is opposite to the trend shown by in situ observations. This leads to general underestimations of stratiform IWC below 5-km altitude and rainwater content above 1-km altitude for a given rain rate. Stratiform precipitation area positively correlates with the convective condensate detrainment flux but is modulated by hydrometeor type, size, and fall speed. Stratiform precipitation area also changes by up to 17%–25% through alterations of the lateral boundary condition forcing frequency. Stratiform precipitation, rain rate, and area across the simulations vary by a factor of 1.5. This large variability is primarily a result of variability in the stratiform downward ice mass flux, which is highly correlated with convective condensate horizontal detrainment strength. The variability of simulated local microphysical processes in the stratiform region plays a secondary role in explaining variability in simulated stratiform rainfall properties.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Univ. of Utah, Salt Lake City, UT (United States); National Center for Atmospheric Research (NCAR), Boulder, CO (United States); Univ. of Arizona, Tucson, AZ (United States); Nanjing Univ. (China); Hebrew Univ. of Jerusalem (Israel)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF); National Basic Research Program of China; National Natural Science Foundation of China (NSFC); Israel Science Foundation
Grant/Contract Number:
SC0012704; AC06-76RL01830; AC02-05CH11231; SC0008678; SC0008648; SC0016476; SC0017015; SC0008811; 2013CB430105; 41575130; 41775132; 2027/17
OSTI ID:
1492883
Alternate ID(s):
OSTI ID: 1492884; OSTI ID: 1501558
Report Number(s):
BNL-211404-2019-JAAM
Journal Information:
Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Vol. 124 Journal Issue: 2; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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