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DOI | 10.1175/JCLI-D-17-0691.1 |
Role of North Indian Ocean Air-Sea Interaction in Summer Monsoon Intraseasonal Oscillation | |
Zhang, Lei1; Han, Weiqing1; Li, Yuanlong1; Maloney, Eric D.2 | |
2018-10-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:19页码:7885-7908 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Air-sea coupling processes over the north Indian Ocean associated with the Indian summer monsoon intraseasonal oscillation (MISO) are investigated. Observations show that MISO convection anomalies affect underlying sea surface temperature (SST) through changes in surface shortwave radiation and surface latent heat flux. In turn, SST anomalies may also affect the MISO precipitation tendency (dP/dt). In particular, warm (cold) SST anomalies can contribute to increasing (decreasing) precipitation rate through enhanced (suppressed) surface convergence associated with boundary layer pressure gradients. These air-sea interaction processes are manifest in a quadrature relation between MISO precipitation and SST anomalies. A local air-sea coupling model (LACM) is formulated based on these observed physical processes. The period of the LACM is proportional to the square root of seasonal mixed layer depth H, assuming other physical parameters remain unchanged. Hence, LACM predicts a relatively short (long) MISO period over the north Indian Ocean during the May-June monsoon developing (July-August monsoon mature) phase when H is shallow (deep). This result is consistent with observed MISO characteristics. A 30-day-period oscillating external forcing is also added to the LACM, representing intraseasonal oscillations propagating from the equatorial Indian Ocean to the north Indian Ocean. It is found that resonance will occur when H is close to 25 m, which significantly enhances the MISO amplitude. This process may contribute to the higher MISO amplitude during the monsoon developing phase compared to the mature phase, which is associated with the seasonal cycle of H. |
英文关键词 | Monsoons Air-sea interaction Intraseasonal variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000442201100002 |
WOS关键词 | BENGAL SALINITY STRATIFICATION ; FREQUENCY EQUATORIAL WAVES ; MADDEN-JULIAN OSCILLATION ; SHEARED ZONAL FLOW ; MIXED-LAYER DEPTH ; SURFACE TEMPERATURE ; ATMOSPHERE INTERACTION ; TROPICAL CIRCULATION ; ERA-INTERIM ; VARIABILITY |
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/20913 |
专题 | 气候变化 |
作者单位 | 1.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA; 2.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA |
推荐引用方式 GB/T 7714 | Zhang, Lei,Han, Weiqing,Li, Yuanlong,et al. Role of North Indian Ocean Air-Sea Interaction in Summer Monsoon Intraseasonal Oscillation[J]. JOURNAL OF CLIMATE,2018,31(19):7885-7908. |
APA | Zhang, Lei,Han, Weiqing,Li, Yuanlong,&Maloney, Eric D..(2018).Role of North Indian Ocean Air-Sea Interaction in Summer Monsoon Intraseasonal Oscillation.JOURNAL OF CLIMATE,31(19),7885-7908. |
MLA | Zhang, Lei,et al."Role of North Indian Ocean Air-Sea Interaction in Summer Monsoon Intraseasonal Oscillation".JOURNAL OF CLIMATE 31.19(2018):7885-7908. |
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