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Home / News / India News / IIT-KGP develops model to predict variability and trends in rainfall
India

IIT-KGP develops model to predict variability and trends in rainfall

IIT-KGP develops model to predict variability and trends in rainfall
Written by Garima Bora
Sep 20, 2018, 04:46 pm 3 min read
IIT-KGP develops model to predict variability and trends in rainfall
Credits:

Researchers at IIT Kharagpur have developed a new statistical model which can be used to predict variability and trends in rainfall over different climate regions of India. The model, developed by researchers of the Center for Oceans, Rivers, Atmosphere and Land Sciences (CORAL), takes into consideration both local and remote factors causing weather changes, an IIT-KGP statement said today. Here's more.

Local factors
Most weather forecast models consider local factors that affect rainfall

Many of these local and remote factors that affect weather conditions have been known to the scientific community, the statement said, adding, most weather forecast models typically consider local factors that affect rainfall. Because of this, there used to be significant uncertainties in such predictions as each independent factor has a certain impact, which may not match with actual conditions, it said.

Rainfall variability
IIT professor explains summer and winter monsoon rainfall variability

"Our study finds that the summer monsoon rainfall variability is governed by the surface temperatures of the Eastern Pacific, Central Pacific, Atlantic, and the north Indian Oceans, and equatorial zonal winds," the statement said quoting Prof Jayanarayanan Kuttippurath. However, the winter monsoon rainfall variability is largely controlled by the surface temperature of the North Atlantic and extratropical oceans, Kuttippurath said.

Technique
Here is how the model works

"In our model, we've used a technique which removes the impact of individual factors to find the trends in rainfall. The model can be used to find the contribution of individual factors to rainfall and can be applied to estimate the trends and variability of rainfall," Dr. Prijitha J Nair said. Nair is the lead researcher who conceived and coordinated this study.

Model
Model has been developed using data of over 38 years

The model can predict any type of weather conditions in the world by changing the relevant factors affecting the changes. It has been developed using data over a period of 38 years and has predicted significant changes in Indian rainfall from the perspective of global climate change. The data analysis conducted revealed significant positive trends (0.43mm/day/dec) in the north-west for summer rainfall during 1979-2017.

Data
Incremental shift of Indian monsoon from east to west: Data

"There are scientific evidences of major climate shifts over centuries. These do not happen overnight but through gradual changes in weather conditions over time," Professor Arun Chakraborty, who supervised the research, was quoted as saying in the statement. "The data shows there has been an incremental shift of Indian monsoon from east to west. However, this would require further studies," Chakraborty said.

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