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Jurnal Sains & Teknologi Modifikasi Cuaca
Published by Badan Pengkajian dan Penerapan Teknologi
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 7 Documents
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Search results for , issue "Vol. 22 No. 1 (2021): June 2021" : 7 Documents clear
KARAKTERISTIK BUTIR AIR HUJAN PERMUKAAN DAN LAPISAN ATAS ATMOSFER PADA PUNCAK MUSIM HUJAN DI TANGERANG SELATAN Sara Aisyah Syafira; Nyayu Fatimah Zahroh; Saraswati Dewi; Findy Renggono
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v22i1.4432

Abstract

Intisari Beberapa penelitian terkait kejadian hujan menggunakan beberapa jenis alat seperti Micro Rain Radar (MRR) dan Disdrometer. Kombinasi kedua instrument tersebut dapat memberikan gambaran yang lebih  komprehensif mengenai kejadian hujan mulai dari lapisan atas atmosfer hingga permukaan. Penelitian ini mengamati beberapa kejadian hujan pada puncak musim hujan tahun 2017 dan pergantian tahun 2019/2020 di Kawasan Puspiptek Serpong, Tangerang Selatan dengan menggunakan instrumen MRR dan Disdrometer untuk mengetahui karakteristik distribusi ukuran butir air hujan. Hasil penelitian ini menunjukkan pola sebaran butir air hujan yang berbeda, antara kejadian hujan dengan intensitas sangat lebat dan sangat ringan hingga lebat, baik pada lapisan atas atmosfer maupun permukaan. Selain itu, hasil penelitian ini menunjukkan bahwa kejadian hujan sangat lebat berasal dari kumpulan awan konvektif dengan durasi hujan selama 15-60 menit. Sedangkan, kejadian hujan ringan hingga sedang pada umumnya berasal dari kumpulan awan nimbostratus di level menengah atmosfer dengan durasi hujan sekitar 2-3 jam. Abstract Several studies used some equipment types to observe rain events, such as the Micro Rain Radar (MRR) and Disdrometer. Combining the two can provide a more comprehensive picture of rain events from the upper atmosphere to the surface. This study observed several rain events at the peak of the rainy season in 2017 and the turn of the year 2019/2020 in the Puspiptek Serpong Area, South Tangerang, using MRR and Disdrometer instruments to determine the characteristics of the droplet size distribution. This study's results indicate a different droplet size distribution pattern, between the incidence of rain with very heavy intensity and very light to dense, both in the upper atmosphere and surface. Besides, this study's results indicate that the very heavy rain events come from convective clouds with a 15-60 minutes rain duration. Meanwhile, light to moderate rain events generally come from a group of nimbostratus clouds in the medium-level atmosphere with a rain duration of roundabout 2-3 hours.
RESPON CURAH HUJAN DIURNAL TERHADAP MADDEN-JULIAN OSCILLATION AKTIF DI BENUA MARITIM BERBASIS GSMAP GAUGE-CALIBRATED V7 Achmad Fahruddin Rais; Ahmad Kosasih; Soenardi; Yamin Saleh Saidu; Sanya Gautami; Umi Fauziyah
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v22i1.4525

Abstract

Intisari Keberadaan pergeseran puncak curah hujan diurnal (DR) terhadap Madden-Julian Oscillation (MJO) aktif di Maritime Continent (MC) masih diperdebatkan sehingga studi ini bertujuan untuk menginvestigasi perubahan tersebut. Selain itu, intensitas rata-rata dan amplitudo DR juga dikaji dalam penelitian ini berbasis GSMaP Gauge-Calibrated V7. Komposit anomali intensitas rata-rata (Ra), amplitudo (Rax) DR MJO aktif dan perbandingan fase puncak DR MJO aktif terhadap klimatologinya (Pax-Pm) pada periode Desember-Januari-Februari (DJF), Maret-April-Mei (MAM), Juni-Juli-Agustus (JJA) dan September-Oktober-November (SON) digunakan dalam tulisan ini dengan uji-z 80%. MJO aktif berbasis rekonstruksi outgoing longwave radiation (OLR) dari kedua indeks realtime multivariate MJO (RMM). Hasil memperlihatkan bahwa MJO aktif memodulasi peningkatan intensitas rata-rata dan amplitudo DR di lautan dan mempengaruhi pergeseran puncak DR menjadi lebih cepat 1 jam dari klimatologi musimannya. Abstract The occurrence of peak phase shift of diurnal rainfall (DR) to active Madden-Jullian Oscillation (MJO) has been debatable, so this study is aimed to investigate the change. Moreover, the mean and amplitude intensity of DR were also analyzed in this study based on GSMaP Gauge-Calibrated V7. The composite of the mean (Ra) and amplitude (Rax) intensity anomaly of DR, and the comparison of DR peak phase during the active MJO to its climatology (Pax-Pm) in the period December-January-February (DJF), March-April-May (MAM), June-July-August (JJA), and September-October-November (SON) were used in the study with the z-test of 80%. The active MJO was based on reconstructed outgoing longwave radiation (OLR) of two real-time multivariate MJO (RMM) indexes. The results showed that active MJO modulated the increased mean and amplitude intensity of DR over the ocean and influenced the DR peak phase shift to be faster than its seasonal climatology by one hour.
SIMULASI NUMERIK MEKANISME TURBULENSI DEKAT AWAN KONVEKTIF Ni Putu Tiana Verayanti; I Kadek Nova Arta Kusuma
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v22i1.4560

Abstract

Intisari Turbulensi yang dialami oleh pesawat komersial rute Jakarta-Medan telah dilaporkan mengalami Clear Air Turbulence (CAT) di atas Sumatera Utara pada tanggal 24 Oktober 2017. Namun berdasarkan data citra satelit Himawari dari Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) Indonesia menyebutkan bahwa di sekitar lokasi turbulensi terdapat awan kumulonimbus. Penelitian ini memanfaatkan model WRF-ARW dengan resolusi spasial dan temporal tinggi untuk mengetahui secara detail proses yang terjadi pada awan konvektif penyebab Near Cloud Turbulence (NCT). Turbulensi tersebut disebabkan oleh bilangan Richardson rendah yang terbentuk di wilayah udara jernih (clear air) yang berjarak 300-700 m di atas puncak awan dan diperkuat dengan adanya Turbulensi Energi Kinetik (TKE) mencapai 4,4 m2 / s2 dan geser angin vertikal (VWS) oleh arus keluar awan konvektif.  Abstract Turbulence encountered by commercial aircraft Jakarta-Medan routes has been reported that experienced Clear Air Turbulence (CAT) over North Sumatra on October 24th, 2017. However, based on Himawari satellite imagery data produced by Agency for Meteorology, Climatology, and Geophysics (BMKG), Indonesia stated that there was a cumulonimbus cloud around the turbulence location. This study utilizes WRF-ARW models with a high spatial and temporal resolution to find out in detail the processes that occur in convective clouds causing Near Cloud Turbulence (NCT). The turbulence was caused by a low Richardson number formed in the clear-air area, which has a distance of 300 - 700 m above the cloud top and reinforced by the existence of Turbulence Kinetic Energy (TKE) reaching 4,4 m2/s2 and vertical wind shear (VWS) by deep convection’s outflow.
FABRICATION OF 2-5 µM HYGROSCOPIC SEEDING MATERIAL FOR RAIN ENHANCEMENT PURPOSES Dini Harsanti; Krisna Adhitya; Safrizal Safrizal
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v22i1.4599

Abstract

Abstract Hygroscopic cloud seeding, which uses giant cloud condensation nuclei (GCCN) particles with diameters between 2-5 µm, has been known to be 100 times more effective compared to those that use hygroscopic flares. Micronisation through jet milling has been recognized as the most common and ubiquitous method used to obtain particles with such a narrow size (2-5 µm) distribution. This research has successfully developed and identified 2-5 µm NaCl powders mixed with 10% cab-o-sil anticaking agent and 2 (two) times jet milling frequency as a potential GCCN (hygroscopic) seeding material. We use a combination of jet mill micronisation, rough milling with a Cross-Beather Mill, and analytical sieving to produce powders with those mentioned above (2-5 µm) size distribution. We varied the anticaking agent percentage in the mixture and the jet milling process frequency to identify which parameters would result in the 2-5 µm size distribution. We then confirmed the micronisation results particle size distribution with a particle size analyzer (PSA) and its morphology with a scanning electron microscope (SEM) machine. The materials with the 10% cab-o-sil agent mixture were confirmed to have the aforementioned size distribution from the characterization results. Intisari Penyemaian awan higroskopis menggunakan partikel giant cloud condensation nuclei (GCCN) dengan diameter 2-5 m telah diketahui 100 kali lebih efektif dibandingkan dengan yang menggunakan flare higroskopis. Mikronisasi melalui jet milling telah dikenal sebagai metode yang paling umum dan banyak digunakan untuk mendapatkan partikel dengan distribusi ukuran sempit (2-5 µm). Penelitian ini berhasil mengembangkan dan mengidentifikasi serbuk NaCl 2-5 µm yang dicampur dengan 10% anti gumpal berupa Cab-O-Sil dan frekuensi jet milling 2 (dua) kali sebagai bahan penyemaian GCCN (higroskopis) potensial. Pada penelitian ini telah digunakan kombinasi mikronisasi jet mill, penggilingan kasar dengan Cross-Beather Mill, dan ayakan analitik untuk menghasilkan serbuk dengan distribusi ukuran yang disebutkan di atas (2-5 µm). Telah divariasikan pula persentase bahan anti gumpal dalam campuran dan frekuensi proses jet milling untuk mengidentifikasi parameter yang akan menghasilkan distribusi ukuran 2-5 µm. Distribusi ukuran partikel hasil mikronisasi tersebut kemudian dikonfirmasi dengan alat analisa ukuran partikel (PSA) dan morfologinya dengan mesin scanning electron microscope (SEM). Dari hasil karakterisasi, material dengan campuran anti gumpal Cab-O-Sil sebanyak 10% dipastikan memiliki sebaran ukuran tersebut.
KAJIAN METEOROLOGI TRANSMISI COVID-19 DI PROVINSI DKI JAKARTA Abdullah Ali; Mangapul P. Tambunan; Rudy P. Tambunan
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jstmc.v22i1.4627

Abstract

Intisari Akhir tahun 2019 menjadi awal dari menyebarnya Coronavirus Diseases 2019 (Covid-19) ke seluruh dunia. Virus ini pertama kali ditemukan di Wuhan, Cina karena banyaknya pasien dengan gejala pneumonia, yang diduga berasal dari pasar seafood di Wuhan. Sejak tanggal 2 Maret 2020, kasus Covid-19 pertama kali terkonfirmasi di Provinsi DKI Jakarta, dan menjadi kasus pertama di Indonesia. Hingga bulan Desember 2020, kasus positif  Covid-19 terus mengalami kenaikan. Banyak penelitian dilakukan untuk mengetahui sifat virus, transmisi, dan faktor-faktor yang mempengaruhi transmisinya, salah satunya adalah faktor meteorologi. Hasil penelitian di Cina dan Iran yang merupakan negara sub tropis menunjukkan bahwa unsur temperatur dan kelembaban relatif memiliki kaitan dengan penambahan jumlah kasus positif. Begitu juga hasil penelitian di Brazil yang merupakan negara tropis menunjukkan bahwa terdapat korelasi negatif antara intensitas radiasi matahari dengan kasus positif. Di Indonesia, penelitian mengenai pengaruh faktor meteorologi terhadap transmisi Covid-19 belum banyak dilakukan. Penelitian ini bertujuan untuk mengkaji transmisi Covid-19 di Provinsi DKI Jakarta dari sudut pandang meteorologi. Hasil kajian dari data selama 6 bulan menunjukkan bahwa tidak terdapat pengaruh antara unsur-unsur meteorologi dengan transimisi Covid-19 di Provinsi DKI Jakarta. Distribusi spasial kenaikan kasus harian tidak mengikuti pola perubahan angin, dan nilai koefisien korelasi Pearson untuk unsur kelembaban, temperatur, dan intensitas radiasi matahari memiliki nilai yang sangat kecil.   Abstract The end of 2019 was the beginning of Coronavirus 2019 (Covid-19) spread throughout the world. This virus was first discovered in Wuhan, China, where many patients showed symptoms of pneumonia and are thought to have originated in a seafood market in Wuhan. Since March 2, 2020, the first positive patient was confirmed in DKI Jakarta and became the first case in Indonesia. Until December 2020, positive cases of Covid-19 continued increasing. Many studies have been carried out to find the virus behaviors, transmission, and the factors that influence the transmission, one of which is meteorological factors. Research in China and Iran, which are subtropical countries, shows that temperature and relative humidity strongly correlate with the increasing number of positive cases. Likewise, the research results in Brazil, which is a tropical country, show a negative correlation of solar radiation to positive cases. In Indonesia, research on the influence of meteorological factors on the transmission of Covid-19 has not been widely carried out. This study aims to examine the transmission of Covid-19 in DKI Jakarta from a meteorological perspective. The study results from 6 months of data show no significant influence between meteorological elements and the Covid-19 transmission in DKI Jakarta. The spatial distribution of daily rate increases does not follow the pattern of wind direction changes, and the Pearson correlation coefficient ??for temperature, temperature, and radiation has very small values.
Preface JSTMC Vol. 22 No. 1 June 2021: Foreword and Acknowledgement Vol. 22 No. 1 June 2021
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

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Abstract

Appendix JSTMC Vol. 22 No.1 June 2021: Author Index & Keyword Index Vol. 22 No.1 June 2021
Jurnal Sains & Teknologi Modifikasi Cuaca Vol. 22 No. 1 (2021): June 2021
Publisher : BPPT

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