Trade winds Fontaine Maury collected enough information to create wind and current charts for the world's oceans. As part of the Hadley cell, surface air flows toward the equator while the flow aloft is towards the poles. A low-pressure area of calm, light variable winds near the equator is known as the doldrums, near-equatorial trough, intertropical front, or the Intertropical Convergence Zone. When located within a monsoon region, this zone of low pressure and wind convergence is also known as the monsoon trough. Around 30° in both hemispheres, air begins to descend toward the surface in subtropical high-pressure belts known as subtropical
Blood rain unknown but it might be related to the monsoon as well, as Kerala is the first state that the southwest monsoon strikes together with Sri Lanka. Again, trade winds (SE and NE) converge at a region called the Inter-Tropical Convergence Zone (ITCZ), which is located close to Kerala and Sri Lanka, which might be another clue for this puzzle. Authors said their steps would be the analysis of intercontinental clouds using High-Efficiency Particulate Air Filters, using the similar DNA sequence based technique called “metagenomics”, which would reveal the entire microbial diversity of these clouds. While most ancient authors, such as