DOI: 10.1007/s00382-015-2513-5
Scopus记录号: 2-s2.0-84946481153
论文题名: Propagation of the Madden–Julian Oscillation and scale interaction with the diurnal cycle in a high-resolution GCM
作者: Peatman S.C. ; Matthews A.J. ; Stevens D.P.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-09-10 起始页码: 2901
结束页码: 2918
语种: 英语
英文关键词: Diagnostics
; Diurnal cycle
; HiGEM
; Maritime Continent
; MJO
英文摘要: The Madden–Julian Oscillation (MJO) is the chief source of tropical intra-seasonal variability, but is simulated poorly by most state-of-the-art GCMs. Common errors include a lack of eastward propagation at the correct frequency and zonal extent, and too small a ratio of eastward- to westward-propagating variability. Here it is shown that HiGEM, a high-resolution GCM, simulates a very realistic MJO with approximately the correct spatial and temporal scale. Many MJO studies in GCMs are limited to diagnostics which average over a latitude band around the equator, allowing an analysis of the MJO’s structure in time and longitude only. In this study a wider range of diagnostics is applied. It is argued that such an approach is necessary for a comprehensive analysis of a model’s MJO. The standard analysis of Wheeler and Hendon (Mon Wea Rev 132(8):1917–1932, 2004; WH04) is applied to produce composites, which show a realistic spatial structure in the MJO envelopes but for the timing of the peak precipitation in the inter-tropical convergence zone, which bifurcates the MJO signal. Further diagnostics are developed to analyse the MJO’s episodic nature and the “MJO inertia” (the tendency to remain in the same WH04 phase from one day to the next). HiGEM favours phases 2, 3, 6 and 7; has too much MJO inertia; and dies out too frequently in phase 3. Recent research has shown that a key feature of the MJO is its interaction with the diurnal cycle over the Maritime Continent. This interaction is present in HiGEM but is unrealistically weak. © 2015, The Author(s). 资助项目: NERC, National Eye Research Centre
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54137
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Centre for Ocean and Atmospheric Sciences, School of Mathematics, University of East Anglia, Norwich, United Kingdom; Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
Recommended Citation:
Peatman S.C.,Matthews A.J.,Stevens D.P.. Propagation of the Madden–Julian Oscillation and scale interaction with the diurnal cycle in a high-resolution GCM[J]. Climate Dynamics,2015-01-01,45(2017-09-10)