A perturbed parameter model ensemble to investigate Mt. Pinatubo's 1991 initial sulfur mass emission
J.-X. Sheng1,a,D. K. Weisenstein2,B.-P. Luo1,E. Rozanov1,3,F. Arfeuille4,b,and T. Peter1J.-X. Sheng et al.J.-X. Sheng1,a,D. K. Weisenstein2,B.-P. Luo1,E. Rozanov1,3,F. Arfeuille4,b,and T. Peter1
Received: 08 Dec 2014 – Discussion started: 18 Feb 2015 – Revised: 28 Sep 2015 – Accepted: 30 Sep 2015 – Published: 19 Oct 2015
Abstract. We have performed more than 300 atmospheric simulations of the 1991 Pinatubo eruption using the AER 2-D sulfate aerosol model to optimize the initial sulfur mass injection as a function of altitude, which in previous modeling studies has often been chosen in an ad hoc manner (e.g., by applying a rectangular-shaped emission profile). Our simulations are generated by varying a four-parameter vertical mass distribution, which is determined by a total injection mass and a skew-normal distribution function. Our results suggest that (a) the initial mass loading of the Pinatubo eruption is approximately 14 Mt of SO2; (b) the injection vertical distribution is strongly skewed towards the lower stratosphere, leading to a peak mass sulfur injection at 18–21 km; (c) the injection magnitude and height affect early southward transport of the volcanic clouds as observed by SAGE II.
We have conducted a perturbed parameter model ensemble to investigate Mt.
Pinatubo's 1991 initial sulfur mass emission. Our results suggest that (a) the initial mass loading of the Pinatubo eruption is ~14 Mt of SO2; (b) the injection vertical distribution is strongly skewed towards the lower stratosphere, leading to a peak mass sulfur injection at 18-21 km; (c) the injection magnitude and height affect early southward transport of the volcanic cloud observed by SAGE II.
We have conducted a perturbed parameter model ensemble to investigate Mt.
Pinatubo's 1991...