The phenomenon of Ice Dew in Dieng Central Java, Indonesia
Later in the social media bersliweran news that the region of Indonesia experienced a drastic drop in temperature due to Aphelion phenomenon, the farthest point of earth orbit from the sun. This information is quite disturbing. The reason, called that the decline in temperature if not anticipated will be bad. Children should be socks and covered with thick blankets. Babies should be in a room that is warm enough. Called in the information, because it is at the furthest point, the heat of the sun is in the nadir to the surface of the earth. This news seems to be true with the decrease in temperature in some cities of Indonesia, such as Bandung and Semarang.
In addition, in the Dieng Plateau or Dieng, Banjarnegara, Central Java, the phenomenon of dew or bun upas is quite thick and covers a large area. Arjuna Dieng Temple Complex in Dieng Kulon Village Batur to Bukit Sikunir is covered with ice dew, Friday morning, July 6, 2018.
The question that arises is, is it true that this Aphelion affect the temperature drop in Java and some areas of the eastern islands of Indonesia to trigger the emergence of ice dew in Dieng?
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Head of Geographic Station of Observation Post Banjarnegara, Setyo Aji explained, based on the weather observation at Geotechnical Station of Banjarnegara located at an altitude of 608 masl, recorded average air temperature in the last 4 days, 1 to 4 July 2018 ranged between 20.7-23.4 degrees Celsius and the minimum temperature can reach 18.2 - 19.2 degrees Celsius.
Assuming that every 100 meters rise occurs a temperature drop of 0.5 degrees Celsius, the Dieng area with an altitude of about 2,065 meters above sea level is estimated to average in the last four days, ranging from 13.7 to 16.4 degrees Celsius and the temperature minimum reach 11.2 - 12.2 degrees Celsius.
"Keep in mind that the soil more easily absorbs heat and more easily releases heat, coupled with the topography of Dieng in the form of a plateau," said Setyo, Friday night yesterday.
According to him, this very cold conditions impact air temperature can reach zero degrees Celcius which can cause moisture or frost to become frozen. Javanese people familiar with the term Bediding season, namely a significant change in temperature early in the dry season.
The direct result of the air temperature changes is the emergence of ice dew phenomenon in Dieng, known to the public as Bun upas or dew poison because it adversely affects vegetable farmers in Dieng.
Setyo explained that regional factors also influence, the indicator is the active monsoon of Australia, which affects the influx of cold air flow from australia to a number of areas in Indonesia, especially located in the south of the equator.
"The impact is a significant drop in air temperature," he added.
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Related to the phenomenon of Aphelion, Deputy of Meteorology, Mulyono R Prabowo stated that the decline in temperature in July is more dominant because in the last few days, in Indonesia, especially Java, Bali, NTB and NTT, the vapor content in the atmosphere is quite small. This can be seen from the cloud cover that is not significant during the last few days. Physically, water vapor and water are substances that are quite effective in storing heat energy.
This low vapor content in the atmosphere causes the radiation energy released by the Earth into space at night not stored in the atmosphere and the energy used to increase atmospheric temperature in the atmosphere of layers near the Earth's surface is insignificant.
"This is what causes the air temperature in Indonesia during the night in the dry season is relatively lower than during the rainy season or the transition," he said.
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According to him, this condition is in contrast to the conditions during the rainy season or the transition in which the moisture content in the atmosphere is quite a lot, so the atmosphere becomes a kind of "hot reservoir" at night. In addition, in July this region of Australia is in the winter period. The nature of the air mass in Australia is cold and dry. The presence of a relatively high air pressure pattern in Australia caused the movement of air masses from Australia to Indonesia increasingly significant.
"As a result, there is a significant decrease in air temperature at night in Indonesia, especially Java, Bali, NTB and NTT," he added.
Based on BMKG observations throughout Indonesia for 1 to 5 July 2018, temperatures of less than 15 degrees Celsius were recorded in some areas. All of them are in the highlands or the foot of the mountain like Frans Sales Lega (NTT), Wamena (Papua), and Tretes (Pasuruan).
The lowest temperature recorded in Frans Sales Lega (NTT) with a value of 12.0 degrees Celsius on July 4, 2018.
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Adp to other regions in Indonesia the lowest temperature difference during the beginning of July 2018 is against the lowest average temperature for the last 30 days is not so great. This suggests that the Aphelion phenomenon has a less significant effect on temperature decline in Indonesia.
"It is hoped that the public will not have to worry too much about the information that there will be a decrease in extreme temperatures in Indonesia as a result of Aphelion," he explained.
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