Emerging evidence of Greenland Ice Sheet melt influence on recent Euro-Mediterranean record-breaking heat and convective storms

In recent decades, the Euro–Mediterranean region has experienced a marked increase in catastrophic summer climate extremes, including persistent record-breaking atmospheric and marine heatwaves, and destructive convective events such as long-lived mesoscale convective systems (derecho) and supercells with unparalleled hail-size. All these have provoked severe socioeconomic, ecological and human impacts. While these phenomena are often studied separately, their frequent co-occurrence suggests the influence of common large-scale circulation drivers, which remain actively debated. Building on recent work linking North Atlantic freshwater anomalies to downstream atmospheric circulation responses, this ongoing study explores whether part of the recent European summer climate signal may be influenced by remote hemispheric-scale forcing associated with Greenland Ice Sheet mass loss, which has also coincidentally accelerated in recent decades due to anthropogenic influences. This linkage was not initially targeted but emerged unexpectedly from exploratory diagnostics motivated by broader investigations of North Atlantic variability. Preliminary results indicate that periods of enhanced summer Greenland melt tend to coincide with subsequent anomalous spring–summer circulation patterns over the Euro-Atlantic sector that favour persistent ridging and blocking-like conditions over the Euro-Mediterranean region. Such circulation states are consistent with environments conducive to prolonged heat stress, the development of marine heatwaves, and subsequent severe convective outbreaks.Initial comparisons with global climate models from CMIP6 suggest that this potential pathway is poorly represented, possibly due to limitations in simulating localized freshwater forcing and its coupled atmosphere–ocean effects, which indicates that current projections of future climate may be underestimating these impacts. Our findings would point out Greenland melting as a previously unreported major driver of spring-summer large-scale circulation changes. Incorporating these processes could then be essential for forecasts systems and long-term projections, likely posing a significant gap in our ability to project future risk. Ongoing work focuses on testing the robustness of this emerging signal, clarifying its relevance relative to other known drivers of European summer extremes and exploring its hemispheric-scale reach.