Judul: Evaluating WRF Nesting Level Configuration in Peatland
Abstrak: Model Weather Research and Forecasting (WRF) telah sering digunakan untuk mensimulasikan kondisi meteorologi, namun proses simulasi kondisi meteorologi pada WRF memiliki tantangan tersendiri, terutama konfigurasi nesting level untuk menentukan efektifitas dan efisiensi dari luaran model dan sumber daya komputasi. Penelitian ini bertujuan untuk menguji kemampuan nesting level model WRF dalam merepresentasikan parameter meteorologi, yaitu curah hujan dan suhu udara, di lahan gambut Kabupaten Pelalawan, Riau, Indonesia. Evaluasi dilakukan dengan mempertimbangkan pengaruh konfigurasi nesting level model. Konfigurasi model yang digunakan pada wilayah studi terdiri dari lima tingkat nesting (D01 18 km; D02 6 km; D03 2 km; D04 0,6 km; D05 0,2 km). Koreksi bias dilakukan dengan menggunakan metode gamma quantile mapping untuk curah hujan dan linear scaling untuk suhu udara. Hasilnya menunjukkan bahwa nilai curah hujan masih kurang ideal bahkan setelah dikoreksi, sehingga dilakukan kategorisasi hari hujan dan hari tidak hujan. Hasil evaluasi menunjukkan bahwa domain 01 lebih baik dalam mensimulasikan hari hujan, sedangkan domain 03 menunjukkan konsistensi dalam mensimulasikan suhu udara. Telah diamati bahwa penggunaan model WRF pada resolusi yang relatif tinggi tidak selalu memberikan hasil yang akurat., The Weather Research and Forecasting (WRF) model has been utilized frequently to simulate meteorological conditions, but the process of simulating meteorological conditions in WRF has its own challenges, especially the nesting level configuration to determine the effectiveness and efficiency of model output and computational resources. This study aims to test the nesting levels ability of the WRF model in representing meteorological parameters, namely precipitation and air temperature, in peatlands of Pelalawan Regency, Riau, Indonesia. The evaluation was carried out by considering the effect of the nesting level configuration of the model. Model configuration to study area is comprises of five-level nesting (D01 18km; D02 6km; D03 2km; D04 0.6km; D05 0.2km). Bias correction was performed using the Gamma quantile mapping method for rainfall and Linear scaling for air temperature. The results show that the rainfall value is less than ideal even after correction, so a categorization of rainy days and non-rainy days was performed. The evaluation results show that domain 01 is better in simulating rainy days, while domain 03 shows consistency in simulating air temperature. It has been observed that utilizing the WRF model at relatively high resolutions does not necessarily yield accurate results.
Keyword: WRF, nesting, peatland, temperature, peatland

Judul: An Evaluation of Weather Research and Forecasting (WRF) Model Schemes for Assessing Hydrometeorological Parameters of Tropical Peatland
Abstrak: The Weather Research and Forecasting (WRF) model has been widely used in the forecasting of extreme meteorological conditions. But, the application to fire weather condition in tropical peatland remains several challenges, especially for the physical schemes’ parameterization. This study aims to test the physical schemes combination to forecast hydrometeorological parameters. This research focused on the Kahayan-Sebangau peat hydrological unit by conducting goodness-of-fit tests on nine combinations of physical parameter schemes. The results showed that in tropics the combination of WSM6 microphysics scheme, YSU primary boundary layer scheme, and Kain-Fritsch cumulus scheme was reliable in predicting rainfall in the wet season, while the New Tiedtke cumulus scheme was suitable for the dry season. The RRTMG longwave and shortwave radiation schemes, as well as the RUC land surface scheme, produced air temperature with lower biases, but the Noah LSM has higher correlation. The RUC land surface scheme also produces better soil moisture values but affects rainfall forecast results. Therefore, the K4 combination was suitable for use in the wet season, while K2 was in dry season.
Keyword: forecasting performance, manajemen kebakaran gambut, parameterisasi fisik

Judul: Kiat sukses usaha industri jamu dan minuman PD. Budi Lestari Jakarta
Abstrak: PD. Budi Lestari merupakan industri kecil minuman yang dikelola secara sederhana dengan bermodalkan Rp. 15.000.000,-. pada tahun 1996, keberadaan usaha ini dikelola oleh Bapak Amir Utama yang memiliki pengalaman 11 tahun pada industri sejenis.
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