Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0327.1 |
The Relationship between the ITCZ and MJO Initiation over the Indian Ocean | |
Zelinsky, Rachel C.1; Zhang, Chidong2; Liu, Chuntao3 | |
2019-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:8页码:2275-2294 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Understanding convective initiation of the Madden-Julian oscillation (MJO) remains an unmet challenge. MJO initiation has been perceived as a process starting from a convectively suppressed large-scale condition with gradual growth of shallow convection to congestus and to deep convective and stratiform systems that cover a large-scale area. During the DYNAMO field campaign over the Indian Ocean, MJO initiation was observed to start from an existing intertropical convergence zone (ITCZ) south of the equator. This raises a question of what possible role the ITCZ may play in convective initiation of the MJO. This study addresses this question through analysis of satellite observations of precipitation and a global reanalysis product. By setting several criteria, MJO and ITCZ events were objectively identified and grouped according to whether MJO initiation was immediately preceded by an ITCZ. The results demonstrate that an ITCZ is neither a necessary nor sufficient condition for convective initiation of the MJO. Nonetheless, evolution of the large-scale circulation, moisture, and convective characteristics during MJO initiation can be different with and without a preexisting ITCZ. Convective growth begins gradually before and during MJO initiation when there is a preexisting ITCZ whereas it is abrupt and slightly delayed without a preexisting ITCZ. Such differences are presumably related to the existing large-scale moist condition of the ITCZ. The results from this study suggest that there are multiple mechanisms for convective initiation of the MJO, which should be considered in theoretical understanding of the MJO. |
英文关键词 | Madden-Julian oscillation Precipitation |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000475399700002 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; SHIP-BORNE RADAR ; VERTICAL STRUCTURE ; PACIFIC ITCZ ; CONVECTION ; RAINFALL ; MODEL ; VARIABILITY ; DYNAMICS ; TROPICS |
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/185747 |
专题 | 地球科学 |
作者单位 | 1.Univ Miami, Miami, FL 33136 USA; 2.NOAA, PMEL, Seattle, WA USA; 3.Texas A&M Univ, Corpus Christi, TX USA |
推荐引用方式 GB/T 7714 | Zelinsky, Rachel C.,Zhang, Chidong,Liu, Chuntao. The Relationship between the ITCZ and MJO Initiation over the Indian Ocean[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(8):2275-2294. |
APA | Zelinsky, Rachel C.,Zhang, Chidong,&Liu, Chuntao.(2019).The Relationship between the ITCZ and MJO Initiation over the Indian Ocean.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(8),2275-2294. |
MLA | Zelinsky, Rachel C.,et al."The Relationship between the ITCZ and MJO Initiation over the Indian Ocean".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.8(2019):2275-2294. |
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