Exploring accumulation-mode-H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;SO&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; versus SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; stratospheric sulfate geoengineering in a sectional aerosol-chemistry-climate model