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SEA-LEVEL VARIABILITY IN THE JAVA SEA LINKED TO MONSOON FORCING AND CLIMATE TELECONNECTIONS (2009–2024) Nugraheni, Imma Redha; Lestari, Tri Anggun; Kristianto, Aries; Avrionesti, Avrionesti; Rejeki, Hasti Amrih; Wijaya, Yusuf Jati
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.571

Abstract

The Java Sea is a shallow, strait-connected shelf where seasonal monsoon forcing and climate modes can strongly modulate sea level, yet their sectoral expressions remain under-resolved. Altimetric observations from 2009–2024 (DUACS) are analyzed and validated against a network of Indonesian tide gauges and partition the basin into western (W-JS), central (C-JS), and eastern (E-JS) sectors. After detrending, the seasonal cycle is diagnosed via amplitude and phase metrics and quantifies interannual teleconnections using lead–lag cross-correlations (−12 to +12 months) between sea-level anomaly (SLA) and the Dipole Mode Index (DMI) and Southern Oscillation Index (SOI), with confidence intervals. DUACS reproduces tide-gauge variability with high skill (median correlation ≈ 0.82; RMSE 5–11 cm; small negative biases), supporting its use as a basin proxy. Seasonally, SLA peaks in DJF, weakens in MAM, reaches a pronounced minimum in JJA, and recovers in SON, with marked zonal heterogeneity: E-JS exhibits the strongest annual range (~18 cm) versus W-/C-JS (~12–13 cm). The seasonal phase is non-synchronous (W-JS maxima in May–June; E-JS in December–January), while C-JS behaves as a transition zone. Interannually, IOD impacts are near-synchronous and negative (lag-0, r ~ −0.41 to −0.47 across sectors), whereas ENSO peaks at short positive lags (SOI leads by ~1 month; r ~ 0.45–0.53), implying higher sea level during La Niña and lower during El Niño. These sign-and-lag relationships, combined with tide and surge information, have the potential to inform seasonal outlooks for ports and low-lying coastal areas of Java.
Dinamika Parameter Mikrofisis Hujan Es berbasis Satelit dan Data Model Reanalisis Carundyatama, Daniar Ihza; Novitarini, Putu Widya; Hakim, Muhammad Zaidan; Winarto, Hari; Kristianto, Aries
Jurnal Pendidikan Geografi Undiksha Vol. 13 No. 2 (2025): Jurnal Pendidikan Geografi Undiksha
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpg.v13i2.91059

Abstract

Hail events result from atmospheric dynamic processes, including a low freezing layer, strong downdrafts, and the growth of convective clouds. This study describes the microphysical dynamic conditions during the hail event in Batu City, East Java Province, on November 2, 2024. Microphysical analysis was conducted using observations, satellite data, and ERA5 ECMWF reanalysis data. The microphysical reanalysis data reveal dynamics in vertical, horizontal dimensions and time series during the formation to dissipation phases. Radiosonde observation data were used for atmospheric stability analysis. Additionally, IR imagery showed increased convective activity with very low temperatures reaching -75°C. The low boundary layer height and increased total cloud column ice indicate a significant concentration of ice particles. The moderate CAPE value of 1300 J/kg indicates sufficient energy potential for convection, while the low CIN value of 50 J/kg facilitates upward air movement to form clouds. The low LFC height and high EL further strengthen the indication that convection can develop vertically into the upper troposphere, allowing for the formation of intense hail.
Co-Authors Abigael, Febby Debora Achmad Zakir Adelina Lumban Gaol Adi Mulsandi Aditya Mulya Aditya Mulya Agung Hari Saputra Alghazali, Muhammad Fathurrachman Alpentido, Rahmat Anggareta Khairunnisa Arno, Giarno Avrionesti, Avrionesti Aydin Umardani, Syarif Abdillah Bayu Edo Pratama Cahya, Shintia Dwi Carundyatama, Daniar Ihza Deffi Munadiyat Putri Deni Septiadi Deni Septiadi Dewi, Aprilia Mustika Djoko Prabowo Dudy Darmawan Wijaya Ejha Larasati Siadari Filbert Pascalis Almer Mahendra Gaol, Adelina Lumban Gaol, Adelina Lumban Hafidz Syarifuddin Hakim, Muhammad Zaidan Halawa, Reinal Taruna Wahyu Hapsoro Agung Nugroho Hari Winarto Hensatiti Niken Pratiwi Imawan Mashuri Immanuel JA Saragih Istihanah, Dini JUFRI, RAVYDO ANGGARA Kaizzi Larasati, Kanaya Khafid Pratama Lestari, Tri Anggun Mari Frystine Maulana, Muhammad Ikko Safrilda Maulana, Muhammad Ikko Safrilda Meldisa Putri Maulidyah Muhammad Afif Shofiyudh Dhuha Muhammad Ryan Novitarini, Putu Widya NUGRAHEINI, IMMA REDHA Nugraheni, Imma Redha Prakoso, Adhitya Pratama, Khafid Pratiwi, Hensatiti Niken Putri, Deffi Munadiyat Qosinatus Sa'diyah Radjab, Fachri Rafi, Rayhan Rani, Annisa Puspa Rejeki, Hasti Amrih Rista Hernandi Virgianto Ryan, Muhammad Ryan, Muhammad Saifulloh, Naufaldi Saragih, Immanuel JA Siadari, Ejha Larasati Siadari, Ejha Larasati Soegiarto, Ita Syahid, Wisnu Tri Wahyu Hadi TUNA, MIRANDA SAHFIRA Usman Efendi Usman Efendi Wandarana, Wulan WINONA PUSPA BETARI Wulan Wandarana Yusuf Jati Wijaya Zakir, Achmad Zakir, Achmad