Global Atmospheric Circulation Reorganization Drives Contrasting Wind Regime Changes Across Hemispheric Latitudes

Abstract

Near‐surface wind regimes govern critical Earth system processes including dust mobilization, ocean mixing, and wildfire spread, yet their multi‐decadal evolution under anthropogenic forcing remains poorly constrained. Here we quantify extreme wind frequency changes (1981–2024) using ERA5‐Land reanalysis with a monthly aggregation approach that reduces sub‐daily biases while capturing persistent wind regimes. A continuous subtropical intensification corridor (20°–40°N) exhibits cumulative increases of 5%–8% in wind magnitude, with anomalies of +1.5 to +2.5 extreme months per year concentrated in the Sahara‐Arabian Peninsula‐Central Asian arid belt. This pattern provides surface‐level confirmation of documented Hadley cell expansion and subtropical jet intensification, operating predominantly during boreal winter (DJF anomalies 2‐3× larger than JJA). Conversely, mid‐latitude regions (45°–60°N) show decline of −5 to −10%, driven by weakened pressure gradients from Arctic amplification. Variance partitioning reveals Africa exhibits 42% of interannual variance explained by trends versus 58% by oscillations, while North America and Asia show 97% internal variability dominance, indicating regionally confined rather than globally pervasive human influence. Only 0.2% of land areas meet credible hotspot criteria (|Z| > 1.5 and |Δ| > 1 month per year) despite 35% showing measurable changes, underscoring the spatial selectivity of regime shifts. Thermal mechanisms, characterized by enhanced seasonal temperature oscillations of +1°C to +2°C, predominantly drive convective intensification in continental arid regions. Notably, a spatial correlation coefficient of +0.45 is observed for Africa. Conversely, dynamic mechanisms, manifested in circulation reorganization and pressure modifications, exert a significant influence at high latitudes. This correlation coefficient is −0.48 for Europe. These findings challenge the prevailing notion of global uniformity in climate change and underscore the necessity for region‐specific, seasonally resolved, multi‐metric approaches to wind regime assessment. Such approaches hold substantial implications for dust transport, energy systems, wildfire risk, and agricultural damage.