Updates to RAS version 2 and its application to the NOAA Unified Forecast System

Moorthi, Shrinivas

doi:10.25923/5fyz-rb36

i

Updates to RAS version 2 and its application to the NOAA Unified Forecast System

2022
By Moorthi, Shrinivas
Series: Office note (National Centers for Environmental Prediction (U.S.)) 511

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Personal Author:

Moorthi, Shrinivas
Corporate Authors:

National Centers for Environmental Prediction (U.S.)
NOAA Program & Office:

NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)
Description:

In this report an advanced and improved version of the Relaxed Arakawa-Schubert (RASv2) convection parameterization, originally developed by Moorthi and Suarez (1992,hereafter MS92, 1999, hereafter MS99) is presented. MS99 included several important improvements of the original RAS presented in MS92. The cloud model in MS99 accounts for virtual effects of moisture in the buoyancy calculations and includes suspended cloud condensate loading and autoconversion at various levels, producing precipitation as a function of height. The suspended cloud condensate is detrained at the cloud-top. This detrained cloud condensate is the convective source of environmental cloud condensate which is needed for models with prognostic cloud condensate. A simple treatment of the ice phase has also been added.
Keywords:

Clouds Numerical Weather Forecasting Numerical Weather Forecasting
Series:

Office note (National Centers for Environmental Prediction (U.S.)) 511
DOI:

https://doi.org/10.25923/5fyz-rb36
Document Type:

Office Note
Place as Subject:

United States
Rights Information:

Public Domain
Compliance:

Submitted
Main Document Checksum:

urn:sha256:896c13a477b015fb171ae573eff81d6b64675570f816b38dbb5a06a79cd795bf
Download URL:

https://repository.library.noaa.gov/view/noaa/47847/noaa_47847_DS1.pdf
File Type:

[PDF - 1.72 MB ]

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