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| DOI | 10.1175/JCLI-D-20-0482.1 |
| Spiciness anomalies of subantarctic mode water in the South Indian Ocean | |
| Nagura M. | |
| 发表日期 | 2021 |
| ISSN | 08948755 |
| 起始页码 | 3927 |
| 结束页码 | 3953 |
| 卷号 | 34期号:10 |
| 英文摘要 | This study investigates spreading and generation of spiciness anomalies of the Subantarctic Mode Water (SAMW) located on 26.6 to 26.8 su in the south Indian Ocean, using in situ hydrographic observations, satellite measurements, reanalysis datasets, and numerical model output. The amplitude of spiciness anomalies is about 0.03 psu or 0.138C and tends to be large along the streamline of the subtropical gyre, whose upstream end is the outcrop region south of Australia. The speed of spreading is comparable to that of the mean current, and it takes about a decade for a spiciness anomaly in the outcrop region to spread into the interior up to Madagascar. In the outcrop region, interannual variability in mixed layer temperature and salinity tends to be density compensating, which indicates that Eulerian temperature or salinity changes account for the generation of isopycnal spiciness anomalies. It is known that wintertime temperature and salinity in the surface mixed layer determine the temperature and salinity relationship of a subducted water mass. Considering this, the mixed layer heat budget in the outcrop region is estimated based on the concept of effective mixed layer depth, the result of which shows the primary contribution from horizontal advection. The contributions from Ekman and geostrophic currents are comparable. Ekman flow advection is caused by zonal wind stress anomalies and the resulting meridional Ekman current anomalies, as is pointed out by a previous study. Geostrophic velocity is decomposed into large-scale and mesoscale variability, both of which significantly contribute to horizontal advection. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy |
| 英文关键词 | Heat budgets/fluxes; Indian Ocean; Interannual variability; Oceanic mixed layer; Sea surface temperature; Water masses/storage |
| 语种 | 英语 |
| scopus关键词 | Advection; Ocean currents; Water conservation; American meteorological societies; Copyright informations; Hydrographic observations; Interannual variability; Mesoscale variability; Mixed layer temperature; Satellite measurements; Subantarctic mode water; Hydrographic surveys |
| 来源期刊 | Journal of Climate
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/178570 |
| 作者单位 | Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan |
| 推荐引用方式 GB/T 7714 | Nagura M.. Spiciness anomalies of subantarctic mode water in the South Indian Ocean[J],2021,34(10). |
| APA | Nagura M..(2021).Spiciness anomalies of subantarctic mode water in the South Indian Ocean.Journal of Climate,34(10). |
| MLA | Nagura M.."Spiciness anomalies of subantarctic mode water in the South Indian Ocean".Journal of Climate 34.10(2021). |
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