Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-16-0367.1 |
Simulations of MJO Propagation across the Maritime Continent: Impacts of SST Feedback | |
Zhu, Jieshun1,2; Wang, Wanqiu3; Kumar, Arun3 | |
2017-03-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The observed Madden-Julian oscillation (MJO) tends to propagate eastward across the Maritime Continent from the eastern equatorial Indian Ocean to the western Pacific. However, numerical simulations present different levels of fidelity in representing the propagation, especially for the tropical convection associated with the MJO. This study conducts a series of coupled simulations using the NCEP CFSv2 to explore the impacts of SST feedback and convection parameterization on the propagation simulations. First, two simulations differing in the model horizontal resolutions are conducted. The MJO propagation in these two simulations is found generally insensitive to the resolution change. Further, based on the CFSv2 with a lower resolution, two additional experiments are performed with model SSTs nudged to climatologies with different time scales representing different air-sea coupling strength. It is demonstrated that weakening the air-sea coupling strength significantly degrades the MJO propagation simulation, suggesting the critical role of SST feedback in maintaining MJO propagation. Last, the sensitivity to convection parameterization is explored by comparing two simulations with different convection parameterization schemes. Analyses of these simulations indicate that including air-sea coupling alone in a dynamical model does not result in realistic maintenance of the MJO eastward propagation without the development of favorable SST conditions in the western Pacific. In both observations and one simulation with realistic MJO propagations, the preconditioning of SSTs is strongly affected by surface latent heat fluxes that are modulated by surface wind anomalies in both zonal and meridional directions. The diagnostics highlight the critical contribution from meridional winds in wind speed variations, which has been neglected in most MJO studies. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000395539100008 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; SEA-SURFACE TEMPERATURE ; TROPICAL INTRASEASONAL OSCILLATION ; GENERAL-CIRCULATION MODEL ; COUPLED EQUATORIAL WAVES ; PART I ; CONVECTION PARAMETERIZATION ; ARAKAWA-SCHUBERT ; CLIMATE MODELS ; OCEAN MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20696 |
专题 | 气候变化 |
作者单位 | 1.Univ Maryland, Climate Predict Ctr, NOAA NWS NCEP, College Pk, MD 20742 USA; 2.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA; 3.Climate Predict Ctr, NOAA NWS NCEP, College Pk, MD USA |
推荐引用方式 GB/T 7714 | Zhu, Jieshun,Wang, Wanqiu,Kumar, Arun. Simulations of MJO Propagation across the Maritime Continent: Impacts of SST Feedback[J]. JOURNAL OF CLIMATE,2017,30(5). |
APA | Zhu, Jieshun,Wang, Wanqiu,&Kumar, Arun.(2017).Simulations of MJO Propagation across the Maritime Continent: Impacts of SST Feedback.JOURNAL OF CLIMATE,30(5). |
MLA | Zhu, Jieshun,et al."Simulations of MJO Propagation across the Maritime Continent: Impacts of SST Feedback".JOURNAL OF CLIMATE 30.5(2017). |
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