Existing high - accuracy wind measurement technologies can be expensive and difficult to operate, leading to gaps in the application of these technologies in situations where they are most useful. (sciencedaily.com)
There are also fewer wind measurements made in the southern hemisphere because of the relatively small area occupied by land and the low number of shipping lanes compared to the north. (newscientist.com)
This image shows QBO amplitude near the equator at a height of 11 miles: Observed values from balloon wind measurements from 1950s to present; simulations from a climate model driven with observed concentrations of greenhouse gases from 1900 to 2005 and then with projected increase through 2100. (sciencedaily.com)