Fig. 2: pSO4 mass budgets in the PRD.
From: Cross-regional PM2.5 sulfate transport to the Pearl River delta: dynamics and chemistry
a Mean diurnal variations in pSO4 mass budget on polluted and clean days. Background shading in yellow, orange and dark blue indicates the morning, afternoon and nighttime periods, respectively. b Comparison of morning (6:00-14:00 local time (LT)) and afternoon (14:00-19:00 LT) budgets across different episodes. For each episode, the budget in the morning or afternoon is displayed in two rows: the first row presents mean horizontal transport fluxes across the PRD boundaries in four directions and mean hourly contributions from the aerosol process (labeled "AERO"); the second row shows mean vertical exchange fluxes, including those from ABLex-H (labeled “H”) and ABLex-A (labeled “A”). All budget terms are expressed in the unit of t h−1.
