New York Oct 22 : Contradicting the prevailing notion that the African continent has been getting progressively drier over time, a new study has found that drought in the continent has actually decreased over the past 1.3 million years.
The study, published in the journal Nature, also found that the continent is on a 100,000-year cycle of wet and dry conditions. Josef Werne, Associate Professor at University of Pittsburgh, along with colleagues from other universities in the US, Australia, Chile, and the Netherlands, made the discovery by examining core samples extracted from the bottom of Lake Malawi, one of the world's largest lakes, located between Malawi, Mozambique, and Tanzania in southeastern Africa.
These new findings challenge the savannah hypothesis - one of the keys to human evolutionary theory -- which states that the progressively drier conditions in Africa led to prehuman ancestors migrating from forests and moving into grasslands.
Previous studies of the climate of Africa focused on the northern part of the continent, and were responsible for the origin of the savannah hypothesis that the continent was getting drier, Werne explained.
Lake Malawi had not been explored previously because the depth of the waters - 700 feet - exceeded researchers' ability to get core samples from the bottom.
The researchers were able to overcome that limitation by using a barge and modifying oil-rig equipment to obtain a 380-meter-long sediment core sample.
The core was dated using a combination of radiocarbon, volcanic ash, and magnetic polarity reversals and examined for "molecular fossils" indicating changing temperature and rainfall.
By noting the changes in temperature records and especially rainfall, the team determined that the continent was getting wetter over time in southern East Africa.
"Climate in this sector of eastern Africa (unlike northern Africa) evolved from a predominantly arid environment with high-frequency variability to generally wetter conditions with more prolonged wet and dry intervals," the study said.
New Delhi, Feb 19: Responding to India at the International Court of Justice in the case of Kulbhushan Jadhav, Pakistan insisted that the Indian Navy officer was a 'spy' and not a businessman. The ..Written by : IANS | 05:13 PM
Hyderabad, Feb 19: Here is the latest news that, TPCC Working President A Revanth Reddy appeared before Enforcement Directorate (ED) Officials in Hyderabad on Tuesday in cash for vote scam. Earlie ..Written by : IANS | 04:44 PM
New Delhi, Feb 19: Meghalaya Governor Tathagata Roy on Wednesday asked the people to boycott Kashmiri goods and also urged people not to visit Kashmir. His statement came Against the backdrop of the ..Written by : IANS | 04:01 PM
Varanasi, Feb 19: PM Modi is in his own constituency today. He invoked Sant Ravidas, a mystic poet of the Bhakti Movement, on his birth anniversary to urge people to end caste discrimination and ident ..Written by : IANS | 03:41 PM
New Delhi, Feb 19: Robert Vadra, brother-in-law of Congress president Rahul Gandhi, did not appear before ED due to bad health, officials said. The ED case against Vadra relates to allegations of m ..Written by : IANS | 02:56 PM
Bengaluru, Feb 19: Two IAF Surya Kiran aircraft part of an aerobatics team crashed at the Yelahanka airbase in Bengaluru while rehearsing for the Aero India air show tomorrow. A video of the incident ..Written by : IANS | 01:32 PM
Mumbai, Feb 19: Nagraj Manjule who gave Marathi cinema its biggest blockbuster with 'Sairat', is now all set to step into Bollywood with his first Hindi feature film. The movie titled 'Jhund' stars me ..Written by : IANS | 01:03 PM
Mumbai, Feb 19: It is well-known news that, Politician Navjot Singh Sidhu was sacked by the Sony TV from The Kapil Sharma Show after his comments on Pulwama terror attack. Now the show host Kapil ..Written by : IANS | 12:38 PM
New Delhi, Feb 19: The Foreign Office said on Tuesday that Pakistan has sought the United Nation's urgent intervention to "defuse tensions" with India. On February 14, at least 41 Central Reserve P ..Written by : IANS | 12:27 PM
New Delhi, Feb 19: Over the Pulwama terror strike, Grand Old Party lashes out on the Government alleging "huge security lapses", and asked Prime Minister Narendra Modi to "walk the talk". 42 Centra ..Written by : IANS | 11:30 AM
Hyderabad, April 12: Nagarjuna's song "Ninnu Roddu Meeda Chusnadi Laggayithu" one of the most popular songs in 1990's. The Song has got a tremendous response in that time. The SOng was super hit film ..Written by : IANS | 05:04 PM
Hyderabad, Apr 10: Preparations related to NTR Rama Rao biopic are ongoing. Bala Krishna is playing the role of NT Rama Rao while the rest of the cast has to be finalized. The selection process for th ..Written by : IANS | 02:13 PM
Hyderabad, Apr 03: Power star Pawan Kalyan has congratulated on the hit of Rangasthalam team here on today. Pawan spoke to Charan after watching "Rangasthalam" on the special screen, he told that h ..Written by : IANS | 04:47 PM
Hyderabad, Mar 26: The Tollywood Gorgeous actress Anushka Shetty had a fabulous start to 2018 with the solid success of Bhaagamathie. Although there have been several rumors on her future projects ..Written by : IANS | 03:04 PM
New Delhi, Feb 19: For the forthcoming Parlia ..
New Delhi, Feb 19: Meghalaya Governor Tathaga ..
Varanasi, Feb 19: PM Modi is in his own const ..
New Delhi, Feb 19: Robert Vadra, brother-in- ..
Bengaluru, Feb 19: Two IAF Surya Kiran aircr ..
Andhra Pradesh, Feb 19: In a shocking incide ..
New Delhi, Feb 19: In a joint appeal, Jammu a ..
New Delhi, Feb 19: Corps Commander of Chinar ..
New Delhi, Feb 19: Over the Pulwama terror st ..
Mumbai, Feb 19: Putting an end to all the str ..
New Delhi, Feb 19: Responding to India at the ..
New Delhi, Feb 19: Amid Tension Over Pulwama ..
New Delhi, Feb 19: The Foreign Office said on ..
New Delhi, Feb 18: India on Monday accused Pa ..
New Delhi, Feb 18: When searched for 'Best To ..
New Delhi, Feb 18: The military options witho ..
Italy, Feb 16: France’s ambassador returned ..
Nigeria, Feb 16: Nigerians awakened on Saturd ..
Bengaluru, Feb 15: On the 6th of February, at ..
New Delhi, Feb 15: Countries from across the ..
New Delhi, Feb 19: The 2019 IPL will begin wi ..
Jaipur,Feb 19: The Rajasthan Cricket Associa ..
New Delhi, Feb 18: CCI Secretary Suresh Bafna ..
Dubai, Feb 18: Kusal Perera's heroics in the ..
Veteran West Indies batsman Chris Gayle has a ..
New Delhi, Feb 16: Hanuma Vihari, on Friday, ..
Kingsmead, Feb 16: Debutant spinner Lasith Em ..
While director Kabir Khan could not envision ..
Sri Lanka arrived in South Africa a beleaguer ..
India smashed out another comprehensive perfo ..
San Fransisco: The Giant Smartphone manufactu ..
Are you passionate about cooking, then grab t ..
New Delhi, Sep 03: In a good news for smartph ..
New Delhi, Aug 22: Xiaomi is one of the most ..
San Francisco, Aug 21: In a shocking news, Am ..
Ingredients: 1/2 Cup Penne Pasta 1 Tbsp ..
New Delhi, Aug 16: In a good news, Jio Phone ..
New Delhi, Aug 15: In a good news for Jio use ..
New Delhi, Aug 13: We all knew that, the fort ..
Hyderabad, Aug 13: Here is the good news for ..