The Impact of the Interaction between Madden-Julian Oscillation and Cold Surge, on Rainfall over Western Indonesia

Q3 Social Sciences Indonesian Journal of Geography Pub Date : 2021-08-28 DOI:10.22146/ijg.64006
Agita Vivi Wijayanti, R. Hidayat, A. Faqih, F. Alfahmi
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引用次数: 2

Abstract

The Madden-Julian Oscillation and Cold Surge phenomena have been known to cause increased rainfall, with the capacity to trigger hydrometeorological disasters, in western Indonesia. However, further investigations are required regarding the interaction between these phenomena on rainfall pattern. Therefore, this study aims to analyze the interaction between MJO and CS over western Indonesia, particularly by using land-based rainfall observation data from multiple stations, as previous studies were dominated by the use of gridded data from remote observations. This study utilized in-situ observation data obtained from 4329 weather observations and rain stations between 1989 and 2018.  Subsequently, quality control performed based on data availability exceeding 70% over a 30-year period resulted in 303 selected stations to be used for further analysis. Meanwhile, the RMM index, as well as reanalysis data of mean sea level pressure and 925 hPa meridional wind, were also applied for MJO and CS identification. According to the composite analysis, the effect of CS on MJO phases tends to increase precipitation by about 50%, over western Indonesia, with maximum increase ranging from 200 to 400% over the northeastern coast of Sumatra, around Karimata Strait (Riau Islands and West Kalimantan), as well as the northern coast of Java. These areas are exposed to the sea and have direct access to the wind-terrain interaction. In addition, the highest rainfall anomaly due to the MJO-CS interaction occurs around Karimata Strait, followed by northern Sumatra and Java, with spatially averaged rainfall anomaly reaching 5 mm/day over the area.
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麦登-朱利安振荡和寒潮相互作用对印度尼西亚西部降雨的影响
众所周知,马登-朱利安涛动和寒潮现象会导致印度尼西亚西部的降雨量增加,从而引发水文气象灾害。然而,这些现象对降雨模式的相互作用还有待进一步研究。因此,本研究旨在分析印度尼西亚西部MJO和CS之间的相互作用,特别是利用来自多个站点的陆基降雨观测数据,因为以前的研究主要使用来自远程观测的网格数据。该研究利用了1989年至2018年期间4329个天气观测站和雨站的现场观测数据。随后,根据30年期间超过70%的数据可用性进行质量控制,选出303个站点用于进一步分析。同时,利用RMM指数、平均海平面气压和925 hPa经向风再分析资料进行MJO和CS的识别。根据综合分析,CS对MJO相的影响倾向于使印度尼西亚西部地区的降水增加约50%,其中苏门答腊岛东北海岸、卡里玛塔海峡周围(廖内群岛和西加里曼丹)以及爪哇北部海岸的降水增加幅度最大,在200 - 400%之间。这些地区暴露于海面,直接接触到风-地形的相互作用。此外,MJO-CS相互作用导致的降水异常最大的地区是Karimata海峡附近,其次是苏门答腊北部和爪哇,该地区的空间平均降水异常达到5 mm/d。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Indonesian Journal of Geography
Indonesian Journal of Geography Social Sciences-Geography, Planning and Development
CiteScore
1.30
自引率
0.00%
发文量
32
审稿时长
8 weeks
期刊介绍: Indonesian Journal of Geography ISSN 2354-9114 (online), ISSN 0024-9521 (print) is an international journal published by the Faculty of Geography, Universitas Gadjah Mada in collaboration with The Indonesian Geographers Association. Our scope of publications include physical geography, human geography, regional planning and development, cartography, remote sensing, geographic information system, environmental science, and social science. IJG publishes its issues three times a year in April, August, and December. Indonesian Journal of Geography welcomes high-quality original and well-written manuscripts on any of the following topics: 1. Geomorphology 2. Climatology 3. Biogeography 4. Soils Geography 5. Population Geography 6. Behavioral Geography 7. Economic Geography 8. Political Geography 9. Historical Geography 10. Geographic Information Systems 11. Cartography 12. Quantification Methods in Geography 13. Remote Sensing 14. Regional development and planning 15. Disaster The Journal publishes Research Articles, Review Article, Short Communications, Comments/Responses and Corrections
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