Multiple-Instance Superparameterization: 2. The Effects of Stochastic Convection on the Simulated Climate

Jones, Todd R.; Randall, David A.; Branson, Mark D.

doi:10.1029/2019MS001611

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Multiple-Instance Superparameterization: 2. The Effects of Stochastic Convection on the Simulated Climate

2019
By Jones, Todd R. ; Randall, David A. ; Branson, Mark D.
Source: Journal of Advances in Modeling Earth Systems, 11(11), 3521-3544

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Journal Title:

Journal of Advances in Modeling Earth Systems
Personal Author:

Jones, Todd R. ; Randall, David A. ; Branson, Mark D.

Jones, Todd R. ; Randall, David A. ; Branson, Mark D. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; OAR (Oceanic and Atmospheric Research) ; WPO (Weather Program Office)

NMFS (National Marine Fisheries Service) ; OAR (Oceanic and Atmospheric Research) ; WPO (Weather Program Office) Less -
Description:

The cloud-permitting model (CPM) of the superparameterized Community Atmosphere Model (SP-CAM) is a stochastic parameterization. As reported in a companion paper, we have created a variant of SP-CAM, called MP-CAM, that uses the averaged feedback of 10 independent two-dimensional CPMs in each global model column, in place of the single CPM of SP-CAM. This ensemble-averaged feedback is interpreted as an approximation to the feedback from a deterministic parameterization. We present evidence that the multiple-instance superparameterization of MP-CAM is indeed more deterministic than SP-CAM. The climates of the SP and MP configurations are compared, giving particular attention to extreme precipitation events and convectively coupled large-scale tropical weather systems, such as the Madden-Julian Oscillation. A number of small but significant changes in the mean state climate are uncovered, and the deterministic parameterization slightly degrades the Madden-Julian Oscillation simulation.
Keywords:

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Precipitation (Meteorology) Weather Forecasting
Source:

Journal of Advances in Modeling Earth Systems, 11(11), 3521-3544
DOI:

https://doi.org/10.1029/2019MS001611
Document Type:

Journal Article
Funding:

Grant no. NA16OAR4590230
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CC BY
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Submitted
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urn:sha256:b5a1659597284abba731f31b1c1aaa89b8446323ccb04504ad1f15864614b070
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https://repository.library.noaa.gov/view/noaa/27467/noaa_27467_DS1.pdf
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Multiple-Instance Superparameterization: 2. The Effects of Stochastic Convection on the Simulated Climate

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