TIME.CO, Jakarta – The endless air pollution in the Greater Jakarta area has forced the government to carry out weather engineering several times to bring in air To rain. During the weather changing operation Saturday, August 26, 2023 through 4:00 PM WB there is no rain information yet.
However, at midnight on Sunday 27th August 2023 around 00.00 WIB, it rained for about five minutes in Salemba, Central Jakarta.
BMKG released the rain distribution data from Aug 26, 2023 at 07:00 WIB to Aug 27, 2023 at 07:00 WIB and it was seen to rain at several spots in Jakarta. The dot distribution appears green, which means light rain of 0.5 – 20 mm/day.
The data shows that Arg Tomang station (West Jakarta) receives 6.2 mm/day of rain, 3 mm/day of Cideng Pumps, 3 mm/day of Katulampa, 2 mm/day of Cengkareng National Housing Corporation, 1, Parung 2mm/day, AWS Golf Modern Tangerang 0.2mm/day and AWS Cibereum Bogor 0.2mm/day.
BRIN Center for Climate and Atmospheric Research researcher Didi Satiadi said the dry season doesn’t mean rain is impossible. “During the dry season the potential for rain is still there, though perhaps less often,” he explained via text message on Aug. 27, 2023.
Shows a screenshot showing the wind and rain conditions on August 27, 2023 at 01:00 AM WIB from www.ventusky.com. “From there you can see that there is a convergence of winds north of Jakarta, to be precise around the Java Sea,” Didi said.
Wind convergence is indicated by the white dashed line. This situation has resulted in an increase in clouds and rain in the area, including a decrease in rain in the area around Jakarta.
This convergence occurs because strong southeasterly winds are “transformed” by the island of Java and mainland winds, and then gather around the Java Sea. “Although the amount of water vapor in the dry season tends to decrease, if it builds up due to wind convergence or slowing it can produce cloud growth and rain,” Didi explained.
Another factor is atmospheric disturbances, so it can rain quite heavily, as has happened in several other areas of Indonesia. Furthermore, the effects of global warming tend to increase the intensity of the hydrological cycle and increase extremes such as heavy rains and droughts in a region.
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Meteorological engineering
Didi also briefly explained artificial rain to reduce air pollution. According to him, the success of this weather modification technique (TMC) depends on many factors, such as the availability of sufficiently cold and thick clouds containing a large number of super-cold water droplets (supercooled drops of water) which can freeze on dispersed condensation nuclei.
Furthermore, the availability of a sufficient number of condensation nuclei and the presence of wind conditions, atmospheric stability and updraft which can scatter condensation nuclei throughout the cloud. In the dry season artificial rain is actually more difficult to achieve because the number of clouds tends to be small, but it is possible to achieve it if these weather conditions can be accommodated.
Pollution control advice
Didi made suggestions to control air pollution, one of which is to reduce emission sources and increase the amount of absorbers.
Sources of emissions can be reduced, for example by increasing the use of clean energy and by controlling emissions from industry, transport and households. Absorbers of air pollution can be increased, for example, by increasing the number of plants and open green spaces.
Pollution basically occurs when the amount of pollutants entering an ecosystem is too much and cannot be processed naturally quickly enough. Therefore, the balance between the amount of pollutant entering and the amount of absorbent must be controlled naturally or by intervention.
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