Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0133.1 |
Salinity Variability Associated with the Positive Indian Ocean Dipole and Its Impact on the Upper Ocean Temperature | |
Kido, Shoichiro; Tozuka, Tomoki | |
2017-10-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:19 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Both surface and subsurface salinity variability associated with positive Indian Ocean dipole (pIOD) events and its impacts on the sea surface temperature (SST) evolution are investigated through analysis of observational/reanalysis data and sensitivity experiments with a one-dimensional mixed layer model. During the pIOD, negative (positive) sea surface salinity (SSS) anomalies appear in the central-eastern equatorial Indian Ocean (southeastern tropical Indian Ocean). In addition to these SSS anomalies, positive (negative) salinity anomalies are found near the pycnocline in the eastern equatorial Indian Ocean (southern tropical Indian Ocean). A salinity balance analysis shows that these subsurface salinity anomalies are mainly generated by zonal and vertical salt advection anomalies induced by anomalous currents associated with the pIOD. These salinity anomalies stabilize (destabilize) the upper ocean stratification in the central-eastern equatorial (southeastern tropical) Indian Ocean. By decomposing observed densities into contribution from temperature and salinity anomalies, it is shown that the contribution from anomalous salinity stratification is comparable to that from anomalous thermal stratification. Furthermore, impacts of these salinity anomalies on the SST evolution are quantified for the first time using a one-dimensional mixed layer model. Since enhanced salinity stratification in the central-eastern equatorial Indian Ocean suppresses vertical mixing, significant warming of about 0.38-0.5 degrees C occurs. On the other hand, stronger vertical mixing associated with reduced salinity stratification results in significant SST cooling of about 0.28-0.5 degrees C in the southeastern tropical Indian Ocean. These results suggest that variations in salinity may potentially play a crucial role in the evolution of the pIOD. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411436700015 |
WOS关键词 | TURBULENCE CLOSURE-MODEL ; SEA-SURFACE TEMPERATURE ; INTRASEASONAL VARIABILITY ; BARRIER-LAYER ; MIXED-LAYER ; PART I ; EVENTS ; REANALYSIS ; CLIMATE ; ENSO |
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/20051 |
专题 | 气候变化 |
作者单位 | Univ Tokyo, Grad Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan |
推荐引用方式 GB/T 7714 | Kido, Shoichiro,Tozuka, Tomoki. Salinity Variability Associated with the Positive Indian Ocean Dipole and Its Impact on the Upper Ocean Temperature[J]. JOURNAL OF CLIMATE,2017,30(19). |
APA | Kido, Shoichiro,&Tozuka, Tomoki.(2017).Salinity Variability Associated with the Positive Indian Ocean Dipole and Its Impact on the Upper Ocean Temperature.JOURNAL OF CLIMATE,30(19). |
MLA | Kido, Shoichiro,et al."Salinity Variability Associated with the Positive Indian Ocean Dipole and Its Impact on the Upper Ocean Temperature".JOURNAL OF CLIMATE 30.19(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