The increase in drought is linked to rising surface temperatures. Hotter temperatures equal more water evaporation. The dry conditions we’re now seeing is an accumulative effect of temperatures that have been getting hotter since the 1970s. The dryer the ground gets from lack of rain the harder it is to replenish. Even if it does manage to rain a bit in times of drought, the water usually re-evaporates before the ground can absorb it.
Like americalibre said, the droughts are caused and worsened by rising surface temperatures, but a significant contributing factor to this rise in surface temperature are variations in oceanic patterns, which also affect storm frequency. Surface temperatures and storm behavior, especially in the mid-latitudes, can be affected by longer-term ocean trends like the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation as well as shorter term patterns like El Niño and La Niña. These are natural events, but some studies suggest that because of climate change due to greenhouse gasses, they are behaving differently, which effects surface temperatures and storm behavior and may be causing droughts.
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