View : 104 Download: 64

Boreal winter MJO teleconnection in the community atmosphere model version 5 with the unified convection parameterization

Title
Boreal winter MJO teleconnection in the community atmosphere model version 5 with the unified convection parameterization
Authors
YooC.ParkS.KimD.YoonJ.-H.H.-M.
Ewha Authors
유창현
SCOPUS Author ID
유창현scopus
Issue Date
2015
Journal Title
Journal of Climate
ISSN
0894-8755JCR Link
Citation
vol. 28, no. 20, pp. 8135 - 8150
Keywords
Circulation/DynamicsConvective parameterizationGeneral circulation modelsMadden-Julian oscillationModels and modelingTeleconnections
Publisher
American Meteorological Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The Madden-Julian oscillation (MJO), the dominant mode of tropical intraseasonal variability, influences weather and climate in the extratropics through atmospheric teleconnection. In this study, two simulations using the Community Atmosphere Model version 5 (CAM5)-one with the default shallow and deep convection schemes and the other with the unified convection scheme (UNICON)-are employed to examine the impacts of cumulus parameterizations on the simulation of the boreal wintertime MJO teleconnection in the Northern Hemisphere. It is demonstrated that the UNICON substantially improves the MJO teleconnection. When the UNICON is employed, the simulated circulation anomalies associated with the MJO better resemble the observed counterpart, compared to the simulation with the default convection schemes. Quantitatively, the pattern correlation for the 300-hPa geopotential height anomalies between the simulations and observation increases from 0.07 for the default schemes to 0.54 for the UNICON. These circulation anomalies associated with the MJO further help to enhance the surface air temperature and precipitation anomalies over North America, although room for improvement is still evident. Initial value calculations suggest that the realistic MJO teleconnection with the UNICON is not due to the changes in the background wind, but rather primarily to the improved tropical convective heating associated with the MJO. © 2015 American Meteorological Society.
DOI
10.1175/JCLI-D-15-0022.1
Appears in Collections:
일반대학원 > 대기과학공학과 > Journal papers
Files in This Item:
001.pdf(5.05 MB)Download
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE