Sensitivity of Linear Models of the Madden–Julian Oscillation to Convective Representation
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atsc-JAS-D-21-0165.1.pdf
Description
Published version
Size
977.09 KB
Format
Adobe PDF
Checksum (MD5)
21a6adbc88ea84f5cbd842ccf112388f
Author(s)
Fuchs-Stone, Željka
Emanuel, Kerry
Date Issued
May 20, 2022
Journal
Journal of the Atmospheric Sciences
Publisher
American Meteorological Society
Citation
Fuchs-Stone, Ž., and K. Emanuel, 2022: Sensitivity of Linear Models of t.he Madden–Julian Oscillation to Convective Representation. J. Atmos. Sci., 79, 1575–1584
Version
Final published version
Abstract
Two analytical models with different starting points of convective parameterizations, the Fuchs and Raymond model on one hand and the Khairoutdinov and Emanuel model on the other, are used to develop “minimal difference” models for the MJO. The main physical mechanisms that drive the MJO in both models are wind-induced surface heat exchange (WISHE) and cloud–radiation interactions (CRI). The dispersion curves for the modeled eastward-propagating mode, the MJO mode, are presented for an idealized case with zero meridional wind and for the realistic cases with higher meridional numbers. In both cases, the two models produce eastward-propagating modes with the growth rate greatest at the largest wavelengths despite having different representations of cumulus convection. We show that the relative contributions of WISHE and CRI are sensitive to how the convection and entropy/moisture budgets are represented in models like these.
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1175/JAS-D-21-0165.1
