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

i

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

2019
By Jones, Todd R. ; Randall, David A. ; Branson, Mark D.

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Journal Title:

Journal of Advances in Modeling Earth Systems
Personal Author:

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

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

Precipitation (Meteorology) Weather Forecasting 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
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

urn:sha256:b5a1659597284abba731f31b1c1aaa89b8446323ccb04504ad1f15864614b070
Download URL:

https://repository.library.noaa.gov/view/noaa/27467/noaa_27467_DS1.pdf
File Type:

[PDF - 19.47 MB ]

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