Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3247-8 |
Decadal change in the boreal summer intraseasonal oscillation | |
Yamaura, Tsuyoshi; Kajikawa, Yoshiyuki | |
2017-05-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | A decadal change in activity of the boreal summer intraseasonal oscillation (BSISO) was identified at a broad scale. The change was more prominent during August-October in the boreal summer. The BSISO activity during 1999-2008 (P2) was significantly greater than that during 1984-1998 (P1). Compared to P1, convection in the BSISO was enhanced and the phase speed of northward-propagating convection was reduced in P2. Under background conditions, warm sea surface temperature (SST) anomalies in P2 were apparent over the tropical Indian Ocean and the western tropical Pacific. The former supplied favorable conditions for the active convection of the BSISO, whereas the latter led to a strengthened Walker circulation through enhanced convection. This induced descending anomalies over the tropical Indian Ocean. Thermal convection tends to be suppressed by descending anomalies, whereas once an active BSISO signal enters the Indian Ocean, convection is enhanced through convective instability by positive SST anomalies. After P2, the BSISO activity was weakened during 2009-2014 (P3). Compared to P2, convective activity in the BSISO tended to be inactive over the southern tropical Indian Ocean in P3. The phase speed of the northward-propagating convection was accelerated. Under background conditions during P3, warmer SST anomalies over the maritime continent enhance convection, which strengthened the local Hadley circulation between the western tropical Pacific and the southern tropical Indian Ocean. Hence, the convection in the BSISO over the southern tropical Indian Ocean was suppressed. The decadal change in BSISO activity correlates with the variability in seasonal mean SST over the tropical Asian monsoon region, which suggests that it is possible to predict the decadal change. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399431900012 |
WOS关键词 | WESTERN NORTH PACIFIC ; SEA-SURFACE TEMPERATURE ; INTERANNUAL VARIABILITY ; ATMOSPHERIC CIRCULATION ; MONSOON ; MODULATION ; MECHANISMS ; PREDICTION ; RAINFALL ; 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/36253 |
专题 | 气候变化 |
作者单位 | RIKEN, Computat Climate Sci Res Team, Adv Inst Computat Sci, Kobe, Hyogo 6500047, Japan |
推荐引用方式 GB/T 7714 | Yamaura, Tsuyoshi,Kajikawa, Yoshiyuki. Decadal change in the boreal summer intraseasonal oscillation[J]. CLIMATE DYNAMICS,2017,48. |
APA | Yamaura, Tsuyoshi,&Kajikawa, Yoshiyuki.(2017).Decadal change in the boreal summer intraseasonal oscillation.CLIMATE DYNAMICS,48. |
MLA | Yamaura, Tsuyoshi,et al."Decadal change in the boreal summer intraseasonal oscillation".CLIMATE DYNAMICS 48(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论