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The influences of the Indian Ocean Dipole (IOD) on rainfall in South Aceh Ratna Permatasari; Yopi Ilhamsyah; Syahrul Purnawan; Ichsan Setiawan; Mutia Ramadhaniaty; Sutarni Sutarni; Eko Cahyo Pristiwantoro
Depik Vol 11, No 3 (2022): DECEMBER 2022
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (506.229 KB) | DOI: 10.13170/depik.11.3.25984

Abstract

This study aimed to examine the influences of the Indian Ocean Dipole (IOD) on rainfall in three districts in South Aceh. The analysis was undertaken using Dipole Mode Index (DMI) data and five years of rainfall (2016 to 2020) in West Labuhan Haji, Tapak Tuan, and Bakongan areas. This research employed a correlation analysis and the Principal Component Analysis, followed by Cluster Analysis to investigate the relationship between IOD and rainfall at the study location. The negative IOD occurred in 2016, and the positive IOD occurred in 2017, 2018, 2019, and 2020. The strongest positive DMI was in October 2019 (1.123˚C), while the strongest negative DMI was in July 2016 (0.661˚C). Generally, the sub-districts of West Labuhan Haji, Tapak Tuan, and Bakongan always have high rainfall. The highest rainfall in West Labuhan Haji was recorded in January 2017 (1014 mm/month), in Tapak Tuan in November 2017 (1073 mm/month), and in Bakongan in July 2020 (605 mm/month). The correlation between DMI and rainfall in the three locations shows different findings. Although it was very small, the IOD affected the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. In West Labuhan Haji, the highest correlation was in lag 1 (0.188); in Tapak Tuan, the highest correlation was in lag 2 (0.156), while in Bakongan, the highest correlation was in lag 2 (-0.191). The correlations in these three locations are considered weak. Thus, the IOD is not the main factor affecting the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. As South Aceh is located in windward, the orographic effect may influence high rainfall in this region.Keywords:DMIRainfallPrincipal component AnalysisWest Labuhan HajiTapak TuanBakongan
The influences of the Indian Ocean Dipole (IOD) on rainfall in South Aceh Ratna Permatasari; Yopi Ilhamsyah; Syahrul Purnawan; Ichsan Setiawan; Mutia Ramadhaniaty; Sutarni Sutarni; Eko Cahyo Pristiwantoro
Depik Vol 11, No 3 (2022): DECEMBER 2022
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.11.3.25984

Abstract

This study aimed to examine the influences of the Indian Ocean Dipole (IOD) on rainfall in three districts in South Aceh. The analysis was undertaken using Dipole Mode Index (DMI) data and five years of rainfall (2016 to 2020) in West Labuhan Haji, Tapak Tuan, and Bakongan areas. This research employed a correlation analysis and the Principal Component Analysis, followed by Cluster Analysis to investigate the relationship between IOD and rainfall at the study location. The negative IOD occurred in 2016, and the positive IOD occurred in 2017, 2018, 2019, and 2020. The strongest positive DMI was in October 2019 (1.123˚C), while the strongest negative DMI was in July 2016 (0.661˚C). Generally, the sub-districts of West Labuhan Haji, Tapak Tuan, and Bakongan always have high rainfall. The highest rainfall in West Labuhan Haji was recorded in January 2017 (1014 mm/month), in Tapak Tuan in November 2017 (1073 mm/month), and in Bakongan in July 2020 (605 mm/month). The correlation between DMI and rainfall in the three locations shows different findings. Although it was very small, the IOD affected the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. In West Labuhan Haji, the highest correlation was in lag 1 (0.188); in Tapak Tuan, the highest correlation was in lag 2 (0.156), while in Bakongan, the highest correlation was in lag 2 (-0.191). The correlations in these three locations are considered weak. Thus, the IOD is not the main factor affecting the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. As South Aceh is located in windward, the orographic effect may influence high rainfall in this region.Keywords:DMIRainfallPrincipal component AnalysisWest Labuhan HajiTapak TuanBakongan
The influences of the Indian Ocean Dipole (IOD) on rainfall in South Aceh Ratna Permatasari; Yopi Ilhamsyah; Syahrul Purnawan; Ichsan Setiawan; Mutia Ramadhaniaty; Sutarni Sutarni; Eko Cahyo Pristiwantoro
Depik Vol 11, No 3 (2022): DECEMBER 2022
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.11.3.25984

Abstract

This study aimed to examine the influences of the Indian Ocean Dipole (IOD) on rainfall in three districts in South Aceh. The analysis was undertaken using Dipole Mode Index (DMI) data and five years of rainfall (2016 to 2020) in West Labuhan Haji, Tapak Tuan, and Bakongan areas. This research employed a correlation analysis and the Principal Component Analysis, followed by Cluster Analysis to investigate the relationship between IOD and rainfall at the study location. The negative IOD occurred in 2016, and the positive IOD occurred in 2017, 2018, 2019, and 2020. The strongest positive DMI was in October 2019 (1.123˚C), while the strongest negative DMI was in July 2016 (0.661˚C). Generally, the sub-districts of West Labuhan Haji, Tapak Tuan, and Bakongan always have high rainfall. The highest rainfall in West Labuhan Haji was recorded in January 2017 (1014 mm/month), in Tapak Tuan in November 2017 (1073 mm/month), and in Bakongan in July 2020 (605 mm/month). The correlation between DMI and rainfall in the three locations shows different findings. Although it was very small, the IOD affected the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. In West Labuhan Haji, the highest correlation was in lag 1 (0.188); in Tapak Tuan, the highest correlation was in lag 2 (0.156), while in Bakongan, the highest correlation was in lag 2 (-0.191). The correlations in these three locations are considered weak. Thus, the IOD is not the main factor affecting the rainfall in West Labuhan Haji, Tapak Tuan, and Bakongan. As South Aceh is located in windward, the orographic effect may influence high rainfall in this region.Keywords:DMIRainfallPrincipal component AnalysisWest Labuhan HajiTapak TuanBakongan
Status Kualitas Perairan Utara Aceh Ditinjau Dari Konsentrasi TSS, BOD5, Dan DO Nisatul Khairunna; Sri Agustina; Ichsan Setiawan; Irwan Irwan; Mutia Ramadhaniaty; Rauzatul Sakinah; Syarifah Keumala; Koko Ondara
Jurnal Kelautan dan Perikanan Indonesia Vol 1, No 3: Desember (2021)
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Parameter Total Suspended Solid (TSS), BOD5 dan DO merupakan parameter fisika yang memiliki peranan penting untuk menentukan kondisi awal lingkungan. Penelitian ini bertujuan untuk mengetahui konsentrasi TSS, BOD5 dan DO pada perairan Utara Aceh maka perlu dilakukan penelitian tentang status kualitas perairan ditinjau dari konsentrasi TSS, BOD5 dan DO. Metode sampling yang digunakan pada penelitian ini yaitu purposive sampling, sedangkan analisis TSS menggunakan gravimetri, BOD5 dan DO dengan metode titrasi. Hasil analisis menunjukkan bahwa TSS tertinggi terdapat pada stasiun 6 dan 7 yang berlokasi di kawasan Krueng Aceh dengan kadar TSS 14 mg/L dan yang terendah terdapat di stasiun 18, 20, 22 dan 23 yaitu sebesar 4 mg/L, stasiun tersebut terletak diantara perairan Alue Naga dan laut lepas pantai Ulee Lheue. BOD tertinggi terdapat pada stasiun 9 yang berlokasi di kawasan Krueng Aceh dengan nilai 2,1 mg/l dan  terendah berada pada stasiun 1 yang terletak di kawasan Perairan Ulee Lheue yaitu dengan nilai 0,765 mg/L. Untuk DO nilai tertinggi terletak pada stasiun 3 dan 6 yang berlokasi di Perairan Ulee Lheue dan Krueng Aceh, dengan nilai 8,15 mg/l. Nilai DO terendah terdapat pada stasiun 9 dengan nilai 7,85 mg/l. Konsentrasi TSS, BOD5, dan DO di Perairan Utara Aceh menunjukkan nilai yang tidak melewati ambang batas sehingga masih tergolong baik (tidak tercemar).