Pune: IMD has its newest research translating the withdrawal of delayed monsoons from India in recent years related to the increase in convective rainfall in the country and also the Indian Sea is getting warmer in the past two decades.
An example is an intense rain of the reverse Monsun which recently beat Uttarakhand and Kerala.
The study of the Indian Meteorology Department (IMD) was recently published in the famous international journal, “Pure and Applied Geophysics” by Springer.
In the 40-year analysis (1980 to 1999 and 2000 to 2019), IMD had found a trend of heating over the Indian sea in the past two decades.
Senior scientist D R Pattanaik from IMD, also the main researcher for this study, told TII, “the average sea level temperatures above the North Indian Ocean were higher over the past two decades compared to the 1980-1999 period.
Variability of sea level temperatures between Annual indicates a significant trend on both, the Arab Sea and Bengal Bay with a relatively higher level of rise above the Arab Sea.
“He said,” Another clear aspect that is clear is that the increasing trend of sea level temperatures over the North Arab Sea has a level slightly higher (0.09 degrees c / decade) compared to the appropriate increase in the trend of sea levels above the North Bay of Bengal (0.07 degrees C / decade).
Similarly, the level of increasing trends of sea level temperature over the Arab Sea South (0.11 degree C / decade) is also higher than the south of Bengal Bengal (0.09 degrees C / decade).
“This study further mudges Tat that an increase in sea level trends, especially in the North and South Arab Sea, is associated with a decrease in longwa radiation trends in the research area, which they correlate with increased cloud cover, causing an increase in events convective rain.
Related to this, convective rainfall (intense rain spells with thunder, lightning) also increased over the past two decades in areas related to increasing moist convective instability.
This analysis also shows that there is a rapid progress of the rainy season in the north after its onset of the southern tip of India, which leads to the onset of the initial monsone over North India along with the withdrawal of delayed monsoons from northwestern India for the past two decades (2000 for 2019).
This is due to the increasing convective activity in the sea and the North Arab environment during the onset phase and the withdrawal of monsoons.
The study also found an increase in convective rainfall in the North Arab Sea, especially during the June onset phase, which led to rapid progress from the rainy season in the north after the onset of the southern end of India.
Similar improvements in convective rains above the North and South Arab Sea are also considered during the September withdrawal phase in the final period, which leads to delays in withdrawal of monsoons from northwestern India in a short time.
Pattanaik told Tii that previous research has determined that heavy rainfall events increased in the southwest rainy season from June to September, related to the increasing trend of moist convective instability.
This year also, the commencement of the Monsun withdrawal from India Northwest India began on October 6, such as against the normal date of September 17.
As on Saturday, the Monsun has not attracted from parts of India on October 15.