![]() Semakin rendah densitas udara lingkungan, maka fatamorgana yang muncul semakin tebal. Semakin tinggi densitas udara lingkungan, semakin tipis fatamorgana yang terlihat. Densitas udara lingkungan berbanding lurus terhadap suhu dan berbanding terbalik terhadap tekanan. Hasil pengamatan tersebut menunjukkan bahwa perubahan suhu dan tekanan udara rata-rata di lingkungan landasan pacu dapat mempengaruhi visibilitas fenomena fatamorgana melalui pengaruhnya pada gradien suhu udara di atas permukaan landasan pacu tersebut. Suhu terendah dimana fatamorgana masih dapat diamati adalah 26 ✬. Sedangkan pada saat cuaca mendung atau gerimis, fatamorgana masih dapat diamati dengan jelas. ![]() Fatamorgana dapat hilang total bila hujan turun dengan cukup lebat. Selanjutnya fatamorgana mengalami sedikit penyusutan pada jam 15.00 WIB-18.00 WIB, namun demikian masih tampak hingga matahari terbenam. Hasil pengamatan menunjukkan bahwa pada saat cuaca cerah, fatamorgana telah muncul sejak matahari terbit dan terus menyebar dari jam 07.00 WIB sampai 13.00 WIB hingga mencapai keadaan paling tebal pada jam 13.00 WIB-15.00 WIB. Data suhu dan tekanan udara lingkungan didapatkan dari basis data yang dikumpulkan oleh Stasiun Meteorologi Blang Bintang, Aceh Besar, Aceh, Indonesia. Waktu pengamatan kemunculan dan kehilangan fatamorgana adalah mulai dari sejak matahari terbit pada pagi hari hingga terbenam pada sore hari, yaitu mulai dari jam 07.00 WIB sampai 18.00 WIB dan dicatat tingkat visibilitasnya. Pengamatan fatamorgana dilakukan di landasan pacu Bandara Sultan Iskandar Muda (SIM) yang berlokasi di Blang Bintang, Aceh Besar, Aceh, Indonesia. All rights reserved.Ībstrak – Telah dilakukan sebuah studi mengenai hubungan suhu dan tekanan udara lingkungan landasan pacu (runway) bandara terhadap visibilitas fatamorgana. The new approximation gives good estimations for humidex indices, while the daily‐average‐value methods present biases with respect to the hourly‐value method. Indices obtained with the new method are compared with indices obtained using the classic method based on hourly data as well as with other two methods based on average daily values. Several potential solutions for computing robust Humidex indices using daily data are examined, including a new approximation method. This study focuses on Humidex, a heat‐stress index used in heat alerts issued by the Meteorological Service of Canada. This task is complicated by the fact that heat‐stress indices are generally computed using hourly data whereas climate model outputs are often archived at daily or longer time steps. To facilitate this, climate services have begun developing climate change projections for heat‐stress indices based on exceedances of thresholds used operationally in meteorological heat warning systems. Public health systems need to be prepared to identify and reduce the susceptibility of vulnerable populations to increased occurrence of heat‐related illness and stress. The projected increase in the frequency and intensity of extreme heat events due to climate change means an associated increase in risk of heat‐related illnesses and mortality. Conversely, when the air temperature is low and the humidity is high, the mirage appears with low visibility (very thin) or almost non-existent or completely gone When the air temperature is high and the humidity is low, the mirage appears with high visibility (very thick), so that it can be observed clearly. Observation shows that changes in temperature and humidity in the runway environment greatly affect the appearance and visibility of mirages. Meanwhile, the lowest and highest air humidities where mirages can still be observed are 51 % and 92 %, respectively. The lowest and highest temperatures where the mirage can still be observed are 26 0C and 32 0C, respectively. Mirage is also still visible when the weather is cloudy or drizzling, but disappears when heavy rain. The observation shows that the mirage has been found since 07.00 AM in the morning until the afternoon at 18.00 PM, even until sunset. Temperature and humidity data were obtained from the Blang Bintang Meteorological Station database, Aceh Besar, Aceh, Indonesia. The relationship between temperature and humidity of the environment with visibility of mirage has been studied by observing mirage on the runway of Sultan Iskandar Muda International Airport (SIM) Aceh, Indonesia.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |