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KARAKTERISTIK MASSA AIR LAPISAN TERCAMPUR DAN LAPISAN TERMOKLIN DI SELAT LOMBOK PADA BULAN NOVEMBER 2015 Firdaus, Randi; Setiyono, Heryoso; Harsono, Gentio
Journal of Oceanography Vol 5, No 4 (2016)
Publisher : Program Studi Oseanografi, Jurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.188 KB)

Penelitian ini bertujuan untuk mengetahui karakteristik massa air di lapisan tercampur dan lapisan termoklin. Karakteristik yang dimaksud adalah suhu, salinitas, densitas, stabilitas statik dan tipe massa air.Penelitian ini menggunakan data suhu, salinitas, densitas dan kedalaman yang diakuisisi dari instrumen CTD. Data suhu dan salinitas digunakan untuk menentukan tipe massa air dengan diagram T-S (Temperatur-Salinitas) yang mengacu pada klasifikasi Wyrtki, sedangkan data densitas dan kedalaman digunakan untuk menentukan stabilitas statik massa air. Stratifikasi massa air ditentukan dengan dengan kriteria ambang lapisan piknoklin >0,125 kg/m3 dari densitas permukaan dan lapisan termoklin >0,5oC dari suhu permukaan. Hasil penelitian menunjukkan adanya stratifikasi lapisan massa air bervariasi secara vertikal dengan kedalaman lapisan tercampur bervariasi dari 0-43 m berdasarkan temperatur dan 0-45 m berdasarkan densitas, lapisan termoklin berada diantara kedalaman 3-412 m. Stabilitas massa air menunjukkan nilai bervariasi dari -15 sampai 30 siklus/jam, nilai Frekuensi Brunt-Vӓїsӓlӓ yang tinggi ditemukan di lapisan termoklin. Hasil diagram T-S menunjukkan adanya empat massa air yang teridentifikasi yaitu massa air North Pacific Intermediate Water (NPIW) yang dicirikan salinitas minimum, massa air North Pacific Subtropical Water (NPSW) dengan karakter salinitas maksimum, massa air North Indian Subtropical Water (NISW) dicirikan salinitas maksimum dan massa air Australasian Mediterranean Water (AAMW) yang dicirikan oleh salinitas maksimum.

Distribution of Sea Surface Temperature and Salinity in the Karimata Strait Yuliardi, Amir Yarkhasy; Firdaus, Randi; Heltria, Septy; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.10-15

The Karimata Strait possesses unique characteristics influenced by its geographical location and the local, regional, and global impacts on its physical, biological, and chemical parameters, contributing to its potential as a significant fishing ground. This study aims to observe and analyze the physical oceanographic parameters, including temperature, salinity, and sea surface currents, within the Karimata Strait. The dataset comprises monthly averaged data, resulting in a single representative value for each month. Key physical parameters examined include temperature, salinity, and the horizontal (u) and vertical (v) current components. The patterns of sea surface temperature (SST) and salinity distribution in the Karimata Strait exhibit significant variations between the west and east monsoons. During the west monsoon season, the South China Sea influenced the region with lower SST and higher salinity than the Java Sea. In contrast, the east monsoon demonstrates an inverse pattern with warmer, fresher waters from the Java Sea moving towards the strait. Additionally, the horizontal distribution of these parameters highlights the critical role of sea currents in dispersing physical oceanographic characteristics within the region. These findings underscore the dynamic nature of the Karimata Strait's oceanography, influenced by seasonal monsoon shifts, water masses from adjacent seas, and freshwater inputs from rivers, crucial for understanding the broader Indonesian Throughflow (ITF) system and its implications for regional climate and marine ecosystems.

Distribution of Sea Surface Temperature and Salinity in the Karimata Strait Yuliardi, Amir Yarkhasy; Firdaus, Randi; Heltria, Septy; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January 2025
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.01.10-15

The Karimata Strait possesses unique characteristics influenced by its geographical location and the local, regional, and global impacts on its physical, biological, and chemical parameters, contributing to its potential as a significant fishing ground. This study aims to observe and analyze the physical oceanographic parameters, including temperature, salinity, and sea surface currents, within the Karimata Strait. The dataset comprises monthly averaged data, resulting in a single representative value for each month. Key physical parameters examined include temperature, salinity, and the horizontal (u) and vertical (v) current components. The patterns of sea surface temperature (SST) and salinity distribution in the Karimata Strait exhibit significant variations between the west and east monsoons. During the west monsoon season, the South China Sea influenced the region with lower SST and higher salinity than the Java Sea. In contrast, the east monsoon demonstrates an inverse pattern with warmer, fresher waters from the Java Sea moving towards the strait. Additionally, the horizontal distribution of these parameters highlights the critical role of sea currents in dispersing physical oceanographic characteristics within the region. These findings underscore the dynamic nature of the Karimata Strait's oceanography, influenced by seasonal monsoon shifts, water masses from adjacent seas, and freshwater inputs from rivers, crucial for understanding the broader Indonesian Throughflow (ITF) system and its implications for regional climate and marine ecosystems

Pengaruh Reward Terhadap Prestasi Belajar Siswa Di SD Swasta Al-Mutakinah Firdaus, Randi; Kirana, Candra
Journal of Sustainable Education Vol. 2 No. 2 (2025): Juni 2025
Publisher : EL-EMIR Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63477/jose.v2i2.164

The purpose of this study was to determine the effect of giving rewards and the influence of rewards on students' learning interests at Al Mutakinah Private Elementary School, Imamah, Mandau District, Bengkalis Regency. This study used a qualitative approach with a descriptive research type. The qualitative approach was chosen because it aims to deeply understand the interests and learning outcomes of grade III students at Al Mutakinah Private Elementary School, Imamah, Mandau District, Bengkalis Regency. This approach also allows researchers to obtain richer and more detailed information through interviews, observations, and documentation that describe social reality naturally. This descriptive study focuses on describing students' conditions and how they affect their learning interests. Based on the results of the study on the effect of giving rewards on students' learning interests at Al Mutakinah Private Elementary School, Imamah, Mandau District, Bengkalis Regency, the following conclusions can be drawn: Planned and Varied Rewards, Rewards given by the school, such as certificates, medals, praise, and the opportunity to choose activities, have a positive influence on students' learning interests. This reward is one way to appreciate students' achievements and behavior, thus encouraging them to be more active in learning activities. Clear Reward Criteria Reward criteria that include academic achievement, positive attitudes, and student involvement in class activities, help students understand what the school expects. With these criteria, students are motivated to show their best efforts. The Right Time to Give Rewards Rewards that are given immediately after students reach their targets provide effective positive reinforcement. This increases students' learning motivation, because they feel that their efforts are directly appreciated. The Effect of Rewards on Learning Interests Giving rewards has been shown to increase students' learning interests. Students who receive rewards show higher enthusiasm in participating in learning activities, and strive to achieve better achievements in the future.

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