▁the ▁average ▁volume ▁dis charge ▁rate ▁of ▁the ▁Pl in ian ▁er u ption ▁and ▁ign im br ite ▁was ▁ 1 – 3 ▁× ▁ 1 0 5 ▁m 3 / s ▁( 1 – 3 ▁× ▁ 1 0 8 ▁kg / s ). ▁A ▁total ▁bulk ▁e ject a ▁of ▁ 1 2 0   km 3 ▁was ▁derived ▁from ▁bulk ▁volumes ▁of ▁p um ice ▁fall ▁and ▁ign im br ite ▁of ▁ 8 3   km 3 ▁and ▁ 3 7 . 5   km 3 , ▁respectively . ▁The ▁ign im br ite - form ing ▁er u ption ▁may ▁have ▁last ed ▁one ▁and ▁a ▁half ▁to ▁four ▁days ▁( 3 5 – 1 0 4 ▁hours ), ▁while ▁the ▁Pl in ian ▁er u ption ▁may ▁have ▁last ed ▁three ▁to ▁nine ▁and ▁a ▁half ▁days ▁( 7 7 – 2 3 0 ▁hours ). ▁The ▁total ▁duration ▁of ▁the ▁er u ption ▁may ▁have ▁been ▁four ▁and ▁a ▁half ▁to ▁four teen ▁days ▁( 1 1 1 – 3 3 3 ▁hours ). ▁ ▁Vol at iles ▁ ▁Pl in ian ▁vol can ic ▁er u ptions ▁can ▁inject ▁a ▁large ▁amount ▁of ▁vol at iles ▁and ▁a eros ols ▁into ▁the ▁atmosphere , ▁leading ▁to ▁climate ▁and ▁environment ▁changes . ▁Ch lor ine ▁concentr ations ▁in ▁the ▁per alk al ine ▁from ▁the ▁Mill en ni um ▁er u ption ▁were ▁post ulated ▁to ▁have ▁reached ▁up ▁to ▁ 2 % ▁and ▁an