Impact of Cumulus Parameterization on Model Convergence of Tropical Cyclone Destructive Potential Simulation at Grey-Zone Resolutions: A Numerical Investigation

Ma, C.; Sun, Y.; Liu, J.; Li, T.; Zhong, Z.

doi:10.3390/atmos10020074

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Impact of Cumulus Parameterization on Model Convergence of Tropical Cyclone Destructive Potential Simulation at Grey-Zone Resolutions: A Numerical Investigation

2019
By Ma, C. ; Sun, Y. ; Liu, J. ; ...
Source: Atmosphere 2019, 10(2), 74

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Details:

Journal Title:

Atmosphere
Personal Author:

Ma, C. ; Sun, Y. ; Liu, J. ; Li, T. ; Zhong, Z.

Ma, C. ; Sun, Y. ; Liu, J. ; Li, T. ; Zhong, Z. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

The Weather Research Forecast model (WRF) is used to examine the destructive potential of tropical cyclone (TC) Shanshan (2006) at various horizontal resolutions (7.5 km-1 km) with different cumulus parameterization (CP) schemes. It is found that the calculated Power Dissipation Index (PDI) increases while the size-dependent destructive potential (PDS) decreases as the grid spacing decreases for all CP-scheme simulations, which indicates a weak model convergence in both PDI and PDS calculations. Moreover, it is change of the storm intensity and inner-core size that lead to the non-convergence of PDI and PDS respectively. At a higher resolution, convection becomes more explicitly resolved, which leads to larger diabatic heating. As a result, the radial pressure gradient force (PGF) increases, and the radius of maximum wind (RMW) decreases. The area of strong diabatic heating subsequently becomes closer to the TC center, which further increases the TC intensity and the PGF near the eyewall. With such a positive feedback loop, the PGF increases and the RMW decreases as the resolution increases. Note that a perfect model should converge well in the simulation of both TC intensity and size, and thus converge in the PDS. For some CP experiments, the calculated PDS convergence is relatively strong, but it is a result of offset between the non-convergent simulations of TC intensity and size. In contrast, the Grell-Freitas scheme exhibits a stronger convergence in the simulations of TC intensity and size, although the convergence in PDS is relatively weak, but is closer to the truth.
Keywords:

[+]

Cyclones Numerical Weather Forecasting
Source:

Atmosphere 2019, 10(2), 74
DOI:

https://doi.org/10.3390/atmos10020074
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4310298
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Library
Main Document Checksum:

[+]

urn:sha256:0a150f41928417711cd4c5d6bce011ed4100b4e58772a58570f11ceaa7a652db
Download URL:

https://repository.library.noaa.gov/view/noaa/51201/noaa_51201_DS1.pdf
File Type:

	Supplemental media	zip
	Machine readable version (XML)	xml

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