Judul: Estimasi Stok dan Emisi Karbon Mangrove di Pulau Pari, Kabupaten Kepulauan Seribu, DKI Jakarta
Abstrak: Strategi mitigasi perubahan iklim global dapat dilakukan salah satunya melalui pemanfaatan ekosistem blue carbon. Ekosistem mangrove menjadi salah satu ekosistem pesisir yang memiliki potensi menyerap dan menyimpan karbon. Pulau Pari, Kepulauan Seribu merupakan salah satu kawasan pesisir dengan potensi ekosistem mangrove tinggi. Penelitian ini dilakukan untuk menghitung estimasi stok dan serapan karbon mangrove alami di Pulau Pari. Penelitian dilakukan di pada lima stasiun di utara, timur, dan barat Pulau Pari selama periode Oktober 2023 hingga Mei 2024. Stok dan serapan karbon dihitung pada carbon pool biomassa dan sedimen mangrove. Berdasarkan hasil penelitian, diketahui mangrove di Pulau Pari berada pada kondisi baik dengan kerapatan mencapai 1363 ind/ha. Mangrove Pulau Pari memiliki stok karbon total sebesar 28.791,1143 ton C dan serapan karbon dioksida total sebesar 105.567,5291 ton CO2 e. Stasiun satu memiliki nilai stok dan serapan karbon tertinggi yang didukung kelimpahan, biomassa, dan jenis substrat. Kerapatan memiliki hubungan yang kuat dengan biomassa, stok karbon, dan serapan karbon dioksida pada ekosistem mangrove., One of the strategies to mitigate global climate change is through the use of blue carbon ecosystems. The mangrove ecosystem is one of the coastal ecosystems that has the potential to absorb and store carbon. Pulau Pari, Kepulauan Seribu is a coastal area with high potential for mangrove ecosystems. This research was conducted to calculate estimates of natural mangrove carbon stock and uptake on Pulau Pari. The research was conducted at five stations in the north, east and west of Pari Island during the period October 2023 to May 2024. Carbon stocks and uptake were calculated from the carbon pool of biomass and mangrove sediment. Based on research results, it is known that the mangroves on Pulau Pari are in good condition with a density of 1363 ind/ha. Pari Island mangroves have a total carbon stock of 28.791,1143 tons C and a total carbon dioxide uptake of 105.567,5291 tons CO2 e. Station one has the highest carbon stock and uptake values supported by abundance, biomass and substrate type. Density has a strong relationship with biomass, carbon stock and carbon dioxide uptake in mangrove ecosystems.
Keyword: mangrove, blue carbon, Pari Island

Judul: Carbon Stock Estimation of Mangrove in Pramuka Island, Kepulauan Seribu
Abstrak: Ekosistem mangrove merupakan salah satu ekosistem yang dapat menyerap emisi gas sehingga dapat menjadi upaya dalam mitigasi pemanasan global. Pulau Pramuka merupakan salah satu pulau di Kepulauan Seribu yang memiliki ekosistem mangrove yang sangat luas sehingga memiliki potensi untuk menyimpan karbon. Penelitian ini bertujuan untuk mengetahui banyaknya stok karbon serta banyaknya karbon yang terserap pada area mangrove di Pulau Pramuka, Kepulauan Seribu, DKI Jakarta pada tegakan dan sedimen. Pengambilan sampel menggunakan metode non destuktif dengan melakukan pengukuran diameter pohon mangrove setinggi dada (DBH) pada 4 stasiun dan menggunakan pipa akrilik untuk mengambil sedimen. Perhitungan biomassa mangrove pada atas dan bawah permukaan menggunakan persamaan alometrik. Analisis karbon tanah menggunakan metode Walkey & Black. Hasil penelitian menunjukkan estimasi potensi stok karbon mangrove di Pulau Pramuka adalah sebesar 345,06 tonC/ha. Kawasan mangrove di Pulau Pramuka mampu menyimpan karbon pada sedimen sebesar 63,86 tonC/ha. Kata kunci: emisi, karbon, mangrove, Pulau Pramuka, Mangrove ecosystem is one of the ecosystems that can absorb gas emissions so that it can be an effort in mitigating global warming. Pramuka Island is one of the islands in Kepulauan Seribu that has a very extensive mangrove ecosystem that has the potential to store carbon. This study aims to determine the amount of carbon stock and the amount of carbon sequestered in mangrove areas on Pramuka Island, Kepulauan Seribu, DKI Jakarta in stands and sediments. Sampling using non destructive method by measuring the diameter of mangrove trees at breast height (DBH) at 4 locations and using acrylic pipes to take sediments. Calculation of mangrove biomass above and below the surface using the allometric equation. Soil carbon analysis using the Walkey & Black method. The results showed that the estimated potential of mangrove carbon stock in Pramuka Island was 345,06 tonsC/ha. The mangrove area on Pramuka Island is able to store carbon in sediments amounting to 63,86 tonsC/ha. Keywords: carbon, emissions, mangrove, Pramuka Island
Keyword: stok karbon

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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