Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0229.1 |
Influence of the Subtropical High and Storm Track on Low-Cloud Fraction and Its Seasonality over the South Indian Ocean | |
Miyamoto, Ayumu1; Nakamura, Hisashi1,2; Miyasaka, Takafumi1 | |
2018-05-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:10页码:4017-4039 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The south Indian Ocean is characterized by enhanced midlatitude storm-track activity around a prominent sea surface temperature (SST) front and unique seasonality of the surface subtropical Mascarene high. The present study investigates the climatological distribution of low-cloud fraction (LCF) and its seasonality by using satellite data, in order to elucidate the role of the storm-track activity and subtropical high. On the equatorward flank of the SST front, summertime LCF is locally maximized despite small estimated inversion strength (EIS) and high SST. This is attributable to locally augmented sensible heat flux (SHF) from the ocean under the enhanced storm-track activity, which gives rise to strong instantaneous wind speed while acting to relax the meridional gradient of surface air temperature. In the subtropics, summertime LCF is maximized off the west coast of Australia, while wintertime LCF is distributed more zonally across the basin unlike in other subtropical ocean basins. Although its zonally extended distribution is correspondent with that of LCF, EIS alone cannot explain the wintertime LCF enhancement, which precedes the EIS maximum under continuous lowering of SST and enhanced SHF in winter. Basinwide cold advection associated with the wintertime westward shift of the subtropical high contributes to the enhancement of SHF, especially around 15 degrees-25 degrees S, while seasonally enhanced storm-track activity augments SHF around 30 degrees S. The analysis highlights the significance of large-scale controls, particularly through SHF, on the seasonality of the climatological LCF distribution over the south Indian Ocean, which reflect the seasonality of the Mascarene high and storm-track activity. |
英文关键词 | Subtropics Extratropical cyclones Planetary waves Stratiform clouds |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430803800005 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; ATMOSPHERIC BOUNDARY-LAYER ; RADIATION BUDGET ; HIGH-LATITUDES ; INTERANNUAL VARIABILITY ; SATELLITE-OBSERVATIONS ; CLIMATE SENSITIVITY ; KUROSHIO EXTENSION ; STRATIFORM CLOUDS ; SUMMER MONSOONS |
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/20486 |
专题 | 气候变化 |
作者单位 | 1.Univ Tokyo, Res Ctr Adv Sci & Technol, Tokyo, Japan; 2.JAMSTEC, Applicat Lab, Yokohama, Kanagawa, Japan |
推荐引用方式 GB/T 7714 | Miyamoto, Ayumu,Nakamura, Hisashi,Miyasaka, Takafumi. Influence of the Subtropical High and Storm Track on Low-Cloud Fraction and Its Seasonality over the South Indian Ocean[J]. JOURNAL OF CLIMATE,2018,31(10):4017-4039. |
APA | Miyamoto, Ayumu,Nakamura, Hisashi,&Miyasaka, Takafumi.(2018).Influence of the Subtropical High and Storm Track on Low-Cloud Fraction and Its Seasonality over the South Indian Ocean.JOURNAL OF CLIMATE,31(10),4017-4039. |
MLA | Miyamoto, Ayumu,et al."Influence of the Subtropical High and Storm Track on Low-Cloud Fraction and Its Seasonality over the South Indian Ocean".JOURNAL OF CLIMATE 31.10(2018):4017-4039. |
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