CINDY2011/DYNAMO Madden-Julian oscillation successfully reproduced in global cloud/cloud-system resolving simulations despite weak tropical wavelet power

Miyakawa, Tomoki; Kikuchi, Kazuyoshi

doi:10.1038/s41598-018-29931-4

i

CINDY2011/DYNAMO Madden-Julian oscillation successfully reproduced in global cloud/cloud-system resolving simulations despite weak tropical wavelet power

2018
By Miyakawa, Tomoki ; Kikuchi, Kazuyoshi

Details

Journal Title:

Scientific Reports
Personal Author:

Miyakawa, Tomoki ; Kikuchi, Kazuyoshi
NOAA Program & Office:

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

The role of tropical atmospheric waves in the propagation mechanism of the Madden-Julian oscillation (MJO), a huge eastward-propagating atmospheric pulse that dominates intraseasonal variation of the tropics and affects the entire globe, has been long discussed but remains unclear. An MJO event observed in a major field campaign is reproduced using a front-running global cloud/cloud-system resolving model with 3.5 km, 7 km, and 14 km meshes. The eastward-migration speed of the MJO convective envelope in the 3.5 km and 14 km simulations agree well with observation, despite weak Kelvin wave signal power calculated by applying a combined Fourier-wavelet transform method. Our results suggest that the eastward propagation of this MJO event was principally controlled by an MJO-scale energy balance, and not by dynamical interaction of embedded tropical waves. The eastward propagation is delayed in the 7 km simulation, which features the highest surface latent heat flux to the west of the convective envelope center. This latent heat flux appears to be caused by prolonged existence of westward-migrating Rossby wave-like cyclonic disturbances near the equator; the embedded waves may not be part of the essential mechanism for the MJO eastward propagation, but can affect it by altering the energy balance.
Keywords:

Atmospheric Science Madden-Julian Oscillation Mathematical Models Atmospheric Science Madden-Julian Oscillation Mathematical Models
Source:

Scientific Reports 8 (11664)
DOI:

https://doi.org/10.1038/s41598-018-29931-4
Pubmed Central ID:

PMC6076279
Document Type:

Journal Article
Funding:

Grant no. NA13OAR4310165 ; Grant no. NA17OAR4310250
Rights Information:

CC BY
Compliance:

PMC
Main Document Checksum:

urn:sha-512:8b8ba73c985d24c76d8ab2f7049a6e1a106ac8c1506218adfe38887d7038cedea9b13db543fed046648e5295e8e56a13e023c78d0d37296d1c280ae2f6e240ca
Download URL:

https://repository.library.noaa.gov/view/noaa/24031/noaa_24031_DS1.pdf
File Type:

[PDF - 4.02 MB ]

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