Kolkata's Spring Season Disappears Amid Climate Change-Induced Heat
Kolkata is witnessing a dramatic shift in its seasonal patterns as spring virtually vanishes, replaced by an abrupt surge in heat. After a very short transitional period, temperatures have soared, with the maximum reaching 33°C this week, signaling a direct impact of climate change on the city's weather.
Temperature Trends and Meteorological Insights
On Tuesday, the maximum temperature in Kolkata shot up to 33.1°C, only to recede slightly to 32.6°C on Wednesday, which was 0.3 notches above the normal mark. This follows a sustained winter where the maximum temperature touched 30°C on February 18 for the first time in about three months. In the past fortnight, day temperatures have stayed above normal on 11 days, highlighting a consistent warming trend.
Meteorologist H R Biswas, head at IMD's Regional Meteorological Centre in Kolkata, explained, "Nowadays, spring in Kolkata is very short, sometimes not even noticeable, owing to the impact of climate change. While spring is the period that marks a smooth transition from winter to summer, its absence makes this transition abrupt. This year, too, there was a brief and light spring period."
Historical Context and Seasonal Changes
Climatologically, spring in Kolkata is a short period of transition from winter to summer, typically marked by pleasant weather from mid-February to mid-March. Traditional signs like the blooming of palash and shimul flowers continue, but the rising heat indicates a departure from normal seasonal patterns. The city experienced a record-breaking low maximum temperature of 18°C on January 6, the lowest in over a decade for the month, making the recent heat feel more intense due to the contrast.
Night temperatures have shown variability, shooting above normal only on four days in the past fortnight. The highest was 25°C on March 2, which was four notches above normal. On Wednesday, the night temperature was 20.5°C, 0.5 notches below the normal mark.
Forecast and Future Weather Patterns
According to the Regional Meteorological Centre, Kolkata is currently experiencing dry westerly or north-westerly winds, which are expected to prevent any significant mercury jump in the next week. During this period, the maximum temperature is likely to swing between 32°C and 34°C, while the minimum will range between 21°C and 23°C.
While Kolkata is not under immediate threat from any major weather systems, meteorologists are monitoring a potential system that could alter wind patterns by next week. This change might trigger thunderstorm activity in parts of south Bengal, adding another layer of complexity to the evolving weather scenario.
Broader Implications and Climate Impact
The disappearance of spring in Kolkata serves as a stark reminder of the broader effects of climate change on regional weather. The abrupt transition from winter cold to summer heat not only affects daily life but also has implications for agriculture, health, and local ecosystems. As temperatures continue to rise, such patterns may become more common, necessitating adaptive measures and increased awareness.
This shift underscores the need for continued monitoring and research into climate trends, as cities like Kolkata adapt to changing environmental conditions. The data from IMD highlights a clear trend of warming, with implications for future seasonal expectations and urban planning.
