Rekordhøje temperaturer har i år skabt enorme problemer i Indien. Forskere undersøger muligt link til klimaforandringer.
KOLKATA, 24 June 2014 (Climate News Network) Meteorological researchers in India suspect that climate change is a contributory factor to the changing weather patterns that have caused the late arrival of the monsoon after a summer of swelteringly dry heat that has broken temperature records.
The summer monsoon arrived in West Bengal last week – almost two weeks later than usual − and brought relief to Kolkata and other cities and states across India that have been enduring an unusually hot summer.
A temperature of 41.5˚C was recorded in Kolkata in late May – the highest in 10 years – while temperatures in New Delhi earlier this month exceeded 43˚C for seven consecutive days, and at one stage reached 48˚C.
Other cities and states have had record temperatures, and many lives have been lost due to the heat.
Livelihoods have also suffered. Kolkata is famous for its bustling streets and pavements crowded with hawkers, but throughout recent months there has been a deserted look to the city.
“We have had to close our stalls earlier than usual and there’s been hardly any customers,” says Asraf Ali, a street hawker. “People from neighbouring districts, who are our main customers, have not been coming into the city due to the terrible heat.”
One thing that’s been worrying residents of Kolkata is an unusual period of what is called “dry heat” – an absence of humidity. Locals say this has made daytime conditions even more scorching.
Aminul Hasaan, a worker in one of Kolkata’s notoriously polluting leather tanning factories, says: “I was working so hard, and usually I sweat so much. But in the weeks before the monsoon I felt my forehead was always dry. It made me feel sick.”
Anshujyoti Das, who works for Express Weather, a private weather research organisation that aims to provide location-specific weather forecasts, says the dry heat indicates certain changes in weather patterns.
He says: “We cannot claim that this is the direct result of climate change, but we can’t brush the issue under the carpet. We must conduct studies to ascertain the reasons behind such unusual weather patterns.”
One possible cause for the dry conditions is thought to be the absence of the north-westerly storms that usually lash Kolkata and surrounding areas in the run-up to the monsoon.
On average, five to seven such storms hit in April and May, but this year only one was recorded. There was also an absence of moisture-laden winds blowing from the south.
Due to the conditions, the local government authorities extended summer vacations at 57,000 primary schools and more than 18,000 secondary schools. And the city police in Kolkata decided that traffic constables aged 55 and above should be relieved of their duties because of the extreme heat.
Dilip Adak, a senior officer at Kolkata’s traffic department, said: “We try to help [traffic policemen] by providing oral rehydration kits and umbrellas, but often that is not enough.”
About half of India’s 1.25 billon people are involved in agriculture and are dependent on the summer monsoon rains. The late arrival of the monsoon can have a serious impact, driving up prices of many agricultural goods.
The latest report from the Indian Meteorological Department shows that the monsoon has not only arrived late but is less intense than normal, with many areas receiving well below average rainfall.
Climate change and the influence of an El Niño – a periodic warming of waters in the western Pacific that affects prevailing trade winds, with serious consequences on both sides of the Pacific and Indian Oceans – are seen as important influences on the behaviour of the monsoon.
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