BANGALORE: Wondering why there is untimely rain and unpredictable weather? Global warming is resulting in increase of temperature over land and sea. As temperature goes up, pressure goes down and a pressure gradient develops between the ocean and the land mass. The net result is that the number of cyclones will go up. Cyclone intensity may vary but the count will be more. Climate change specialist and a consultant for the World Bank, Prof MB Rajegowda at the University of Agricultural Sciences, explains the changing monsoon pattern vis-a-vis global warming.
What's the likely impact of global warming on cyclones?
With global warming, the number of cyclones is likely to be more. Whatever the nature of the cyclone, the probability of their occurrence goes up with climate change.
What's the process of cyclone formation with regard to the phenomenon of global warming?
Temperature over land and sea is constantly increasing across the globe. This is causing the pressure quotient to come down. As a result , a pressure gradient develops between ocean (water bodies) and continent (land surface ) and whirling winds (cyclones) are generated in the ocean. These winds later move towards land in the form of cyclones.
How is cyclone movement different over the ocean and land?
Wind speed keeps on increasing as long as it's over the ocean and till it touches the land. Once winds enter the continent, there is friction and their velocity starts declining. The cyclone intensity decreases too.
When do these cyclones usually generate?
In the northern hemisphere between October and January. This phenomenon is most visible when the season changes from winter and moves towards summer.
What are the general climate patterns in Karnataka in the context of global warming?
There is an overall increase of 1% in precipitation for the entire state since the 1980s. There has been a decline in south-west monsoon rain on an average (from 825-875 mm to 765-825 mm) and this drop is being compensated by the north-east monsoon and premonsoon , which have gained in their share by 3%-4 %. Coastal and hilly zones are also steadily losing out on annual precipitation while interior parts of the state are gaining.
What are the solutions to keep pace with climate change?
Mitigation strategies need to be adopted. Climate change has a tremendous impact on agriculture and we have drawn up an exhaustive action plan to ensure losses are minimal. There is an imminent need to adjust cropping pattern, low-water requirement, and shortterm crops need to be planted.
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