ORCID Profile
0000-0001-5327-7597
Current Organisation
Badan Riset dan Inovasi Nasional Republik Indonesia
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Publisher: Universitas Gadjah Mada
Date: 19-11-2021
DOI: 10.22146/IJG.63543
Abstract: Anomalous rainfall during the dry season over the tropical region is determined by sea surface temperature (SST) anomalies driven by remote forcing. Anomalous precipitation during the dry season in Java (the so-called "anomalously-wet dry season”) has increased the number of hydrometeorological disasters, with notable events occurring in 2010, 2013, and 2016. Here we analyze anomalously-wet dry seasons in Java from 2000 to 2019 using variables such as precipitation, wind, temperature, outgoing longwave radiation, and SST obtained from the Tropical Rainfall Measuring Mission and ERA5 European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis. This study focuses on anomalously-wet dry seasons in Java during the absence periods of negative phase for the El Niño Southern Oscillation (ENSO) and/or Indian Ocean Dipole (IOD) by identification the main caused. The results show that the contribution of local seas is more significant (37%) in developing anomalously-wet dry seasons than La Niña (33%), the IOD and La Niña combined (17%), and the IOD alone (13%). Local Indonesian seas play a significant role in causing extreme precipitation and spread over the Maritime Continent. We also find that SSTs in the southern Java Sea are sensitive to a negative IOD, but not to La Niña.
Publisher: Southwest Jiaotong University
Date: 30-06-2021
DOI: 10.35741/ISSN.0258-2724.56.3.3
Abstract: During the dry season (May to October) in Java, Indonesia, anomalously high rainfall is investigated using 37-year rainfall data from the Climate Hazards Group InfraRed Precipitation with Station data. The analysis focuses on the years having high rainfall during the dry season between 1982 and 2019. It is conducted using a combination of the presence and absence of La Niña, negative Indian Ocean Dipole Mode events, and other atmospheric/oceanic parameters, such as 2-m temperature, sea surface temperature, outgoing longwave radiation, 200 mb and 850 mb wind. The results show that the presence of both La Niña and negative Indian Ocean Dipole Mode events contributes around 39% to the high rainfall during the dry season, the presence of negative Indian Ocean Dipole Mode - 22%, the absence of both events - 22%, and the presence of La Niña - 17%. The dynamics of monsoon circulation anomaly (200 mb and 850 mb) in the southern Indian Ocean off the coast of Sumatra and Java also plays a role in the increased rainfall during the dry season in Java. This anomaly occurs due to a vortex in the southern equatorial Indian Ocean around 10⁰S, triggering the formation of double Inter-tropical Convergence Zones over the area north of the equator and the southern waters of Java. The increase in rainfall due to this local factor reaches a maximum and extends in June and October, which is associated with the strengthening of circulation anomalies in southern Java, both spatially and vertically (850 and 200 mb).
Publisher: Springer Nature Singapore
Date: 2023
Publisher: Elsevier BV
Date: 03-2031
Publisher: Springer Science and Business Media LLC
Date: 27-04-2023
Publisher: IOP Publishing
Date: 11-2021
DOI: 10.1088/1755-1315/893/1/012046
Abstract: Local seas play a significant role in causing anomalously wet of the dry season over the Indonesia Maritime Continent (10°S-8°N, 95-145°E). As a result, modeling the anomalously-wet dry season over Indonesia lead challenges due to several subregional processes over local seas could not be captured well in the regional climate model. This study explores subregions processes of sea-air interaction over the western Maritime Continent by simulating diurnal precipitation using Cubic Conformal Atmospheric Model (CCAM) with a spatial resolution of 32 km during the anomalously-wet dry season periods during May-to-September (MJJAS) 2020. The simulated results were confirmed by precipitation data from Tropical Rainfall Measuring Mission (TRMM) satellite observation. The results show anomalous circulation patterns induce anomalous regional precipitation over western MC is induced by anomalous circulation patterns over four keys of seas subregion, i.e., Indian Ocean, South China Sea, southern Sumatra (L ung and Sunda strait), and the Java Sea. Furthermore, the anomalous circulation also modulates anomalous local circulation and enhances surface water vapor by an increased surface latent heat flux.
Publisher: IOP Publishing
Date: 03-2021
DOI: 10.1088/1755-1315/718/1/012006
Abstract: Over recent decades, warming events in the tropical Indian Ocean (IO) have been documented in both the western and eastern IO. However, the manifestation of marine warming events in the Indonesian waters is still lacking in information. This paper presents the first case study of long-term warming events and short-term extreme warming events off the coast of West Sumatra using Sea Surface Temperature (SST) data covering 37 years (1982-2018). A statistical climate toolbox is applied to quantify the marine warming rates, including Marine Heatwaves (MHWs) identification. Decadal trends in marine warming are positive across the study region indicate significant warming rates with the average value of about 0.15°C decade −1 . In line with the long-term marine warming, MHW events off West Sumatra has been revealed to be increasing in its occurrences, duration, and intensity. Much of this significant increase in MHW properties has occurred during the period 2015-2018. The MHW events off West Sumatra appear to be influenced by El Niño Southern Oscillation (ENSO), particularly during strong El Niño and La Niña periods. These marine warmings trend and MHW events have never been documented and quantified before in the waters around West Sumatra.
Location: Indonesia
No related grants have been discovered for Erma Yulihastin.