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Title: Coupling WRF Double-Moment 6-Class Microphysics Schemes to RRTMG Radiation Scheme in Weather Research Forecasting Model

Journal Article · · Advances in Meteorology
DOI:https://doi.org/10.1155/2016/5070154· OSTI ID:1331729
 [1];  [1];  [2]
  1. Korea Institute of Atmospheric Prediction Systems (KIAPS), 35 Boramae-ro 5-gil, Dongjak-gu, Seoul 70770, Republic of Korea
  2. Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
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A method to explicitly calculate the effective radius of hydrometeors in the Weather Research Forecasting (WRF) double-moment 6-class (WDM6) microphysics scheme is designed to tackle the physical inconsistency in cloud properties between the microphysics and radiation processes. At each model time step, the calculated effective radii of hydrometeors from the WDM6 scheme are linked to the Rapid Radiative Transfer Model for GCMs (RRTMG) scheme to consider the cloud effects in radiative flux calculation. This coupling effect of cloud properties between the WDM6 and RRTMG algorithms is examined for a heavy rainfall event in Korea during 25–27 July 2011, and it is compared to the results from the control simulation in which the effective radius is prescribed as a constant value. It is found that the derived radii of hydrometeors in the WDM6 scheme are generally larger than the prescribed values in the RRTMG scheme. Consequently, shortwave fluxes reaching the ground (SWDOWN) are increased over less cloudy regions, showing a better agreement with a satellite image. The overall distribution of the 24-hour accumulated rainfall is not affected but its amount is changed. A spurious rainfall peak over the Yellow Sea is alleviated, whereas the local maximum in the central part of the peninsula is increased.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1331729
Report Number(s):
PNNL-SA-118323
Journal Information:
Advances in Meteorology, Vol. 2016; ISSN 1687-9309
Publisher:
Hindawi
Country of Publication:
United States
Language:
English

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Cited By (5)

Sensitivity study of the planetary boundary layer and microphysical schemes to the initialization of convection over the Arabian Peninsula
  • Schwitalla, Thomas; Branch, Oliver; Wulfmeyer, Volker
  • Quarterly Journal of the Royal Meteorological Society, Vol. 146, Issue 727 https://doi.org/10.1002/qj.3711
journal December 2019
Impact of Change in Monsoonal Circulation Due to SST Warming on the North East Asian Monsoon: A Model Analysis Using Satellite Based Sub-Grid Hydrometeors journal October 2018
Impact of the Sea Surface Salinity on Simulated Precipitation in a Global Numerical Weather Prediction Model journal January 2019
Assessment of Simulated Solar Irradiance on Days of High Intermittency Using WRF-Solar journal January 2020
Sensitivity study of the planetary boundary layer and microphysical schemes to the initialization of convection over the Arabian Peninsula text January 2019

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