Home/Current Affairs/Monsoon Seasons ends in Deficit Rainfall | PWOnlyIAS 2023
Monsoon Seasons ends in Deficit Rainfall | PWOnlyIAS 2023
3 Oct 2023
Context:
In a year marked by El Niño conditions, the southwest monsoon in India remained subdued, resulting in “below-average” cumulative rainfall, as per the India Meteorological Department (IMD) estimates.
Spatial Distribution of Rainfall:
Northwest Indiarecorded 593 mm of rainfall compared to a long-period average of 587.6 mm.
Central India, where agriculture predominantly relies on monsoon rains, recorded 981.7 mm against a normal of 978 mm.
The South Peninsula experienced an eight percent deficit.
Rainfall across the country as a whole stood at 91 percent of LPA in June, 113 percent in July, 64 percent in August, and 113 percent in September.
The IMD reported that east and northeast India recorded 1,115 mm of rainfall against a normal of 1,367.3 mm, which translates to an 18 percent deficit.
Meteorological Subdivisions:
Out of the 36 meteorological subdivisions, three (constituting 9 percent of the total area) received excess rainfall, 26 received normal rainfall (covering 73 percent of the total area), and seven received deficient rainfall.
The seven subdivisions with deficient rainfall are:
Nagaland, Manipur, Mizoram, and Tripura, Gangetic West Bengal, Jharkhand, Bihar, East UP, South Interior Karnataka, and Kerala.
Normal Rainfall:
Rainfall activity ranging between 96 percent and 104 percent of the LPA is defined as normal.
The 2023 monsoon season concluded with 94.4 percent cumulative rainfall, which is “near normal”.
Normal rainfall is critical for India’s agricultural landscape, with 52 percent of the net cultivated area relying on it.
According to the weather department, some “positive factors” mitigated some of the deficiency caused by El Niño conditions this year, which ended up providing “near normal” precipitation.
These factors included the Indian Ocean Dipole (IOD) and Madden-Julian Oscillation (MJO)
Indian Ocean Dipole (IOD)
IOD is defined by the difference in the sea surface temperatures between the western parts of the Indian Ocean near Africa and the eastern parts of the ocean near Indonesia.
Madden-Julian Oscillation (MJO):
MJO is a large-scale atmospheric disturbance originating in tropical Africa and traveling eastward, typically lasting 30 to 60 days. It is known for increasing convection in the Bay of Bengal and the Arabian Sea.
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