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Effects of interannual salinity variability on the barrier layer in the western-central equatorial Pacific: A diagnostic analysis from Argo
Zheng Fei1; Zhang Rong-Hua2,3; Zhu Jiang1
2014-05-01
发表期刊ADVANCES IN ATMOSPHERIC SCIENCES
卷号31期号:3页码:532-542
文章类型Article
摘要In this paper, interannual variations in the barrier layer thickness (BLT) are analyzed using Argo three-dimensional temperature and salinity data, with a focus on the effects of interannually varying salinity on the evolution of the El Nio-Southern Oscillation (ENSO). The interannually varying BLT exhibits a zonal seesaw pattern across the equatorial Pacific during ENSO cycles. This phenomenon has been attributed to two different physical processes. During El Nio (La Nia), the barrier layer (BL) is anomalously thin (thick) west of about 160A degrees E, and thick (thin) to the east. In the western equatorial Pacific (the western part: 130A degrees-160A degrees E), interannual variations of the BLT indicate a lead of one year relative to those of the ENSO onset. The interannual variations of the BLT can be largely attributed to the interannual temperature variability, through its dominant effect on the isothermal layer depth (ILD). However, in the central equatorial Pacific (the eastern part: 160A degrees E-170A degrees W), interannual variations of the BL almost synchronously vary with ENSO, with a lead of about two months relative to those of the local SST. In this region, the interannual variations of the BL are significantly affected by the interannually varying salinity, mainly through its modulation effect on the mixed layer depth (MLD). As evaluated by a one-dimensional boundary layer ocean model, the BL around the dateline induced by interannual salinity anomalies can significantly affect the temperature fields in the upper ocean, indicating a positive feedback that acts to enhance ENSO.;     In this paper, interannual variations in the barrier layer thickness (BLT) are analyzed using Argo three-dimensional temperature and salinity data, with a focus on the effects of interannually varying salinity on the evolution of the El Nio-Southern Oscillation (ENSO). The interannually varying BLT exhibits a zonal seesaw pattern across the equatorial Pacific during ENSO cycles. This phenomenon has been attributed to two different physical processes. During El Nio (La Nia), the barrier layer (BL) is anomalously thin (thick) west of about 160A degrees E, and thick (thin) to the east. In the western equatorial Pacific (the western part: 130A degrees-160A degrees E), interannual variations of the BLT indicate a lead of one year relative to those of the ENSO onset. The interannual variations of the BLT can be largely attributed to the interannual temperature variability, through its dominant effect on the isothermal layer depth (ILD). However, in the central equatorial Pacific (the eastern part: 160A degrees E-170A degrees W), interannual variations of the BL almost synchronously vary with ENSO, with a lead of about two months relative to those of the local SST. In this region, the interannual variations of the BL are significantly affected by the interannually varying salinity, mainly through its modulation effect on the mixed layer depth (MLD). As evaluated by a one-dimensional boundary layer ocean model, the BL around the dateline induced by interannual salinity anomalies can significantly affect the temperature fields in the upper ocean, indicating a positive feedback that acts to enhance ENSO.
关键词Barrier Layer Salinity Effect Enso Argo
DOI10.1007/s00376-013-3061-8
收录类别SCI
语种英语
WOS记录号WOS:000334181000004
引用统计
被引频次:39[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/18191
专题海洋环流与波动重点实验室
作者单位1.Chinese Acad Sci, Inst Atmospher Phys, Int Ctr Climate & Environm Sci, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
3.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA
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Zheng Fei,Zhang Rong-Hua,Zhu Jiang. Effects of interannual salinity variability on the barrier layer in the western-central equatorial Pacific: A diagnostic analysis from Argo[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2014,31(3):532-542.
APA Zheng Fei,Zhang Rong-Hua,&Zhu Jiang.(2014).Effects of interannual salinity variability on the barrier layer in the western-central equatorial Pacific: A diagnostic analysis from Argo.ADVANCES IN ATMOSPHERIC SCIENCES,31(3),532-542.
MLA Zheng Fei,et al."Effects of interannual salinity variability on the barrier layer in the western-central equatorial Pacific: A diagnostic analysis from Argo".ADVANCES IN ATMOSPHERIC SCIENCES 31.3(2014):532-542.
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