 This timing closely matches the seasonality of dust emission from the Bodele.Individual dust storms in the Bodele were also shown in this research to coincide with a major strengthening of the Bodele Low Level Jet which, in turn, is associated with the ridging of the Libyan High, a feature of the subtropical High Pressure belt.The same researchers who in 2004 more accurately determined the speed of wind through the depression also published in 2006 work showing that more than half of the dust needed for fertilizing the Amazon Rainforest is provided by the Bodélé depression, depositing up to 50 million tonnes in South America per year.