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DOI10.1175/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
ISSN0894-8755
EISSN1520-0442
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
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被引频次:25[WOS]   [WOS记录]     [WOS相关记录]
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
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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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