Judul: Deteksi Merkuri Asal Darah Lumba-Lumba Hidung Botol (Tursiops Aduncus) Di Kawasan Konservasi Ocean Dream Samudra Ancol
Abstrak: Merkuri merupakan logam berat dengan tingkat toksisitas tertinggi dan dapat terakumulasi dalam tubuh hewan. Penelitian ini bertujuan untuk mengetahui kadar merkuri yang terkandung dalam darah lumba-lumba hidung botol Indo- Pasifik (Tursiops aduncus). Sampel darah diambil dari enam ekor lumba-lumba yang berasal dari kawasan konservasi Ocean Dream Samudra, Ancol. Kadar merkuri dalam darah diukur dengan spektrofotometer serapan atom. Hasil pengukuran menunjukkan bahwa keenam sampel mengandung logam berat merkuri dengan kadar tertinggi sebesar 2.523 ppm dan kadar terendah sebesar 1.015 ppm.
Keyword: darah, merkuri, Tursiops aduncus

Judul: Kandungan merkuri (Hg) dalam air dan organ tubuh ikan petek (Leiognathus equulus) di perairan Ancol, Teluk Jakarta
Abstrak: Melalui proses bioakumulasi, logam berat merkuri (Hg) yang terkandung di dalam perairan akan mempengaruhi kelangsungan hidup biota laut termasuk ikan petek (Leiognathus equulus). Kadar merkuri dalam tubuh organisme dipengaruhi kondisi kualitas perairan. Penelitian ini mengkaji kandungan merkuri dalam air dan pada organ ikan petek serta respon histopatologisnya pada organ insang dan hati ikan petek. Penelitian dilaksanakan di Perairan Ancol, Teluk Jakarta pada bulan Oktober-Desember 2004. Pengambilan contoh air dan ikan masing-masing sebanyak 16 dan 3 stasiun. Hasil analisis kualitas air dibandingkan dengan baku mutu air laut untuk kehidupan biota laut (Keputusan Menteri Lingkungan Hidup No. 51 tahun 2004), kandungan merkuri pada organ tubuh ikan dibandingkan dengan kadar maksimum merkuri dalam tubuh ikan menurut Palar (2004) yaitu 0,23-0,8 ppm dan berbagai negara sebesar 0,5 ppm (Hutagalung 1991). Kualitas perairan Ancol masih berada pada kisaran yang normal. Kandungan merkuri di perairan dan pada organ ikan petek memiliki nilai yang sangat rendah karena terbatas pada sensitivitas alat AAS (Atomic Absorption Spectrophotometer). Hanya ikan yang tertangkap di stasiun 1 yang pada organ insang dan hati terdeteksi mengandung merkuri, tetapi nilai tersebut masih berada pada batas normal. Histopatologis yang tampak pada organ insang ikan petek tidak mengalami kelainan, sedangkan organ hati mengalami peradangan berupa nekrosis. Hal ini diduga merupakan tekanan fisiologis, dan reaksi penting dalam sistem pertahanan hidupnya.
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Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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