Yudha Setiawan Djamil
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Long Term Rainfall Trend of The Brantas Catchment Area, East Java Edvin Aldrian; Yudha Setiawan Djamil
Indonesian Journal of Geography Vol 38, No 1 (2006): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2233

Abstract

Spatial and temporal rainfall analyses of the Brantas Catchment Area from 1955 to 2002 based on 40 daily rainfall stations has been performed. To identify the climate pattern for the last five decades, we used the Empirical Orthogonal Function (EOF) followed by the Fast Fourier Transform. By using EOF, we found the monsoonal pattern as the most dominant, which explains about 72% of all variances. The interannual pattern shows a negative trend of the monsoonal strength. From the monthly isohyets for each decade, the rainfall amount appears to decrease significantly during the last five decades, indicated by wider low rainfall amount areas and the orographic effect is detected, indicated by always greater amount in highlands. From rainfall data in mountain and coastal areas, dry periods had been increasing, mainly in lowlands. Thus, the continued imbalance of the dry and wet period is one cause of the monsoonal strength decrease during the last five decades.
Karakteristik Gelombang Panas Laut Di Perairan Selatan Jawa Barat Riztiawan, Alfianu Adhi; Firdaus, Hadi; Saptari, Muhammad Khairan; Djamil, Yudha Setiawan; Syamsuddin, Mega Laksmini; Syamsudin, Fadli; Sari, Qurnia Wulan
Jurnal Kelautan Vol 18, No 3: Desember (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i3.31731

Abstract

ABSTRAKPerairan Selatan Jawa Barat merupakan wilayah dengan dinamika oseanografi yang kompleks, dipengaruhi oleh faktor regional maupun global. Kompleksitas ini membuat area tersebut sangat rentan terhadap peningkatan suhu permukaan laut akibat perubahan iklim, yang dapat memicu Gelombang Panas Laut (GPL) dan berpotensi mengganggu ekosistem laut. Studi ini menganalisis GPL di wilayah tersebut selama periode 1995-2024 menggunakan data suhu permukaan laut hasil penginderaan satelit. Parameter utama GPL (frekuensi, durasi, dan intensitas maksimum) dievaluasi secara spasial dan temporal. Hasil menunjukkan bahwa wilayah pesisir mengalami frekuensi dan intensitas GPL yang lebih tinggi, menandakan kerentanan perairan dangkal terhadap kejadian suhu ekstrem. GPL paling ekstrem terjadi pada tahun 1998, 2010, dan 2016, dengan tahun 2016 menunjukkan durasi terpanjang (35 hari) dan frekuensi tertinggi (7,28 kejadian). Intensitas maksimum tercatat pada tahun 1998 sebesar 1,89 °C, diikuti oleh tahun 2016 dan 2010. Pola temporal sangat dipengaruhi oleh variabilitas antar-tahunan, kemungkinan didorong oleh mode iklim seperti ENSO, sementara tren jangka panjang yang signifikan tidak terdeteksi. Studi ini berfokus pada parameter utama GPL dan tidak membahas faktor fisik potensial seperti fluks panas udara-laut, sirkulasi arus laut, atau gaya angin lokal. Temuan ini memberikan dasar ilmiah bagi upaya konservasi ekosistem pesisir sekaligus mendukung perumusan kebijakan perikanan tangkap yang adaptif terhadap variabilitas iklim di selatan Jawa Barat.Kata Kunci: Gelombang Panas Laut, Satelit, Suhu Permukaan LautABSTRACTThe Western Southern Java Waters are a region with complex oceanographic dynamics influenced by both regional and global factors. This complexity makes the area highly susceptible to increasing sea surface temperatures due to climate change, which can trigger Marine Heatwaves (MHWs) and potentially disrupt marine ecosystems. This study analyzed MHWs in the region over the period 1995-2024 using satellite-derived sea surface temperature data. The primary metrics of MHWs (frequency, duration, and maximum intensity) were evaluated both spatially and temporally. Results show that coastal areas experienced higher MHW frequency and intensity, indicating greater vulnerability of shallow waters to extreme temperature events. The most extreme MHWs occurred in 1998, 2010, and 2016, with 2016 exhibiting the longest duration (35 days) and highest frequency (7.28 events). Maximum intensity peaked in 1998 at 1.89 °C, followed closely by 2016 and 2010. Temporal patterns were strongly influenced by interannual variability, likely driven by climate modes such as ENSO, whereas no significant long-term trends were detected. This study focused on primary MHW metrics and did not explore  potential  physical  drivers such  as air-sea  heat flux,  ocean current circulation, or local wind forcing. These findings provide a scientific basis for coastal ecosystem conservation efforts and support the formulation of climate-adaptive fisheries management policies in southern West Java.Keywords: Marine Heatwaves, Satellite, Sea Surface Temperature