Pengaruh Fenomena El Nino Southern Oscillation dan Dipole Mode Terhadap Curah Hujan di Kabupaten Ketapang

El Niño Southern Oscillation (ENSO) merupakan fenomena cuaca yang terjadi di Samudra Pasifik, sedangkan Dipole Mode (DM) adalah fenomena cuaca yang terjadi di Samudra Hindia. Kedua fenomena tersebut berpengaruh terhadap curah hujan pada beberapa wilayah di Indonesia. Pada penelitian ini telah dianalisis pengaruh fenomena ENSO dan DM terhadap curah hujan di Kabupaten Ketapang Provinsi Kalimantan Barat periode tahun 1984 sampai dengan tahun 2012 menggunakan metode Fast Fourier Transform (FFT) dan wavelet. Hasil analisis menunjukkan bahwa pengaruh pola ENSO dan DM rendah terhadap curah hujan di Kabupaten Ketapang ditunjukkan dengan nilai korelasi sebesar -0,18 dan -0,12. Pada saat terjadi El Niño curah hujan di Kabupaten Ketapang cenderung rendah. Namun saat terjadi DM Positif curah hujan di Kabupaten Ketapang cenderung tidak rendah. Sedangkan saat terjadi La Nina dan atau DM Negatif curah hujan di Kabupaten Ketapang cenderung tinggi

Estimasi Konsentrasi PM10 Menggunakan Support Vector Regression

PM10 berkontribusi terhadap polusi udara pada saat kejadian kabut asap di musim kemarau dengan salah satu sumber utamanya adalah pembakaran biomassa. Pada saat musim kemarau, terdapat banyak kegiatan pembersihan lahan di Mempawah untuk persiapan masa tanam yang Sebagian besar dilakukan dengan pembakaran sisa tanaman. Sebagai salah satu polutan utama yang dapat memengaruhi kesehatan manusia, maka estimasi konsentrasi PM10 sangat penting untuk dilakukan. Tujuan dari penelitian ini untuk melakukan estimasi konsentrasi PM10 di Mempawah tahun 2019 menggunakan Support Vector Regression (SVR) berdasarkan data PM10 dan variabel meteorologi seperti curah hujan, kelembaban, suhu, tekanan permukaan laut dan kecepatan angin dari Stasiun Klimatologi Mempawah dengan periode latih tahun 2016 hingga 2018. Hasil penelitian ini menunjukkan bahwa estimasi konsentrasi PM10 menggunakan SVR berdasarkan parameter cuaca dapat menggambarkan variabilitas konsentrasi harian PM10 di Mempawah dengan baik, terkecuali saat terjadi kenaikan konsentrasi yang sangat tinggi yang mungkin dipengaruhi oleh faktor antropogenik. Selain itu, berdasarkan verifikasi, RMSE yang dihasilkan model estimasi hampir sama dengan nilai standar deviasi observasinya.

KAJIAN KETERSEDIAAN AIR BAKU WILAYAH PERBATASAN ARUK – SAJINGAN BESAR STUDI KASUS DESA SEBUNGA KECAMATAN SAJINGAN BESAR KABUPATEN SAMBAS

One of the Indonesian government's policies to support border areas is the supply of raw water in border areas. This was carried out by an order to support the development and development program of the Aruk - Sajingan Besar border area, which was intended to accelerate development in the border area which has been known as a backward area. To support the development and development of the Aruk border region, various attempts have been made by the central government and the provincial government of West Kalimantan. This research is one of the efforts to support the government program by examining the availability of raw water in the Aruk-Sajingan Besar border area. Based on the results of the hydrological study at the study site, the mainstay discharge of raw water reaches 0.5 - 2 m3 / sec with a large evapotranspiration of 3-4 mm / day. In addition, this study also projects water needs for the next 25 years, these results are compared with the availability of raw water so that it can be concluded that up to 2045 the people of Sebunga Village, Sajingan Besar District, Sambas Regency, water needs can be met

THE ANALYSIS OF LAPSE RATE PROFILE IN THE SITE CANDIDATE OF NUCLEAR POWER PLANT (NPP) AT GOSONG BEACH, BENGKAYANG REGENCY– WEST KALIMANTAN

The lapse rate profile in the site candidate for the Nuclear Power Plant (NPP) at Gosong Beach Bengkayang, has been investigated to obtain a description of the lability of the atmosphere and upper air as part of a meteorological aspect safety study in the plan to develop a NPP site. The study of the lapse rate was carried out using air data on the reanalysis of the Global Data Assimilation System (GDAS) by extracting air temperature data at each altitude level so as to obtain a lapse rate of up to 25 km. Daily data was processed during 2021 and transformed in the monthly average profile data to describe the lapse rate profile in January – December 2021. Tropopause was identified with average altitude about 16.6 km and stratosphere at 20.5 km with a lapse rate about -0.21 ℃/100 m. The surface layer to 200 m have lapse rate from 0.7 ℃/100 m - 0.9 ℃/100 m at 00.00 Universal Time Coordinated (UTC) and 0.5 ℃/100 m -0.6 ℃/100 m at 12.00 UT

THE ANALYSIS OF LAPSE RATE PROFILE IN THE SITE CANDIDATE OF NUCLEAR POWER PLANT (NPP) AT GOSONG BEACH, BENGKAYANG REGENCY– WEST KALIMANTAN

The lapse rate profile in the site candidate for the Nuclear Power Plant (NPP) at Gosong Beach Bengkayang, has been investigated to obtain a description of the lability of the atmosphere and upper air as part of a meteorological aspect safety study in the plan to develop a NPP site. The study of the lapse rate was carried out using air data on the reanalysis of the Global Data Assimilation System (GDAS) by extracting air temperature data at each altitude level so as to obtain a lapse rate of up to 25 km. Daily data was processed during 2021 and transformed in the monthly average profile data to describe the lapse rate profile in January – December 2021. Tropopause was identified with average altitude about 16.6 km and stratosphere at 20.5 km with a lapse rate about -0.21 ℃/100 m. The surface layer to 200 m have lapse rate from 0.7 ℃/100 m - 0.9 ℃/100 m at 00.00 Universal Time Coordinated (UTC) and 0.5 ℃/100 m -0.6 ℃/100 m at 12.00 UT

AERONET Remotely Sensed Measurements and Retrievals of Biomass Burning Aerosol Optical Properties During the 2015 Indonesian Burning Season

An extreme biomass burning event occurred in Indonesia from September through October 2015 due to severe drought conditions, partially caused by a major El Niño event, thereby allowing for significant burning of peatland that had been previously drained. This event had the highest sustained aerosol optical depths (AODs) ever monitored by the global Aerosol Robotic Network (AERONET). The newly developed AERONET Version 3 algorithms retain high AOD at the longer wavelengths when associated with high Ångström exponents (AEs), which thereby allowed for measurements of AOD at 675 nm as high as approximately 7, the upper limit of Sun photometry. Measured AEs at the highest monitored AOD levels were subsequently utilized to estimate instantaneous values of AOD at 550 nm in the range of 11 to 13, well beyond the upper measurement limit. Additionally, retrievals of complex refractive indices, size distributions, and single scattering albedos (SSAs) were obtained at much higher AOD levels than possible from almucantar scans due to the ability to perform retrievals at smaller solar zenith angles with new hybrid sky radiance scans. For retrievals made at the highest AOD levels the fine‐mode volume median radii were ~0.25–0.30 micron, which are very large particles for biomass burning. Very high SSA values (~0.975 from 440 to 1,020 nm) are consistent with the domination by smoldering combustion of peat burning. Estimates of the percentage peat contribution to total biomass burning aerosol based on retrieved SSA and laboratory measured peat SSA were ~80–85%, in excellent agreement with independent estimates