A new study is shown that volcanic ash reflects sunlight or solar radiation months after the volcanic eruption. The volcanic ash consists of minerals, fragments of rocks, volcanic glass which is larger than 2mm. Those tiny particles reflect solar radiation back to space preventing the radiation to heat the Earth's atmosphere below.
Answer: It increases the amount of solar radiation that is reflected into space. It increases the amount of solar radiation that is absorbed by oceans and lakes
Natural selection does not prefer features that are superior in some way. Instead, it favors characteristics that are advantageous in a particular setting. Characteristics that are beneficial in one context may be harmful in another.