General circulation models show that as the surface temperature increases, convective anvil clouds shrink. By analyzing radiative-convective equilibrium simulations, we this behavior is rooted in basic energetic and thermodynamic properties of atmosphere: As climate warms, rise remain at nearly same temperature, but find themselves a more stable atmosphere; enhanced stability reduces outflow upper troposphere decreases cloud fraction. warming increasing upper-tropospheric stability,...

Abstract Cloud‐resolving models have shown that under certain conditions, the Radiative‐Convective Equilibrium (RCE) could become unstable and lead to spontaneous organization of atmosphere into dry wet areas, aggregation convection. In this study, we show “self‐aggregation” behavior also occurs in nonrotating RCE simulations performed with IPSL‐CM5A‐LR General Circulation Model (GCM), it exhibits a strong dependence on sea surface temperature (SST). We investigate physical mechanisms...

Tropical deep convection exhibits a variety of levels aggregation over wide range scales. Based on multisatellite analysis, the present study shows at mesoscale that different are statistically associated with differing large‐scale atmospheric states, despite similar convective intensity and forcings. The more aggregated convection, dryer less cloudy atmosphere, stronger outgoing longwave radiation, lower planetary albedo. This suggests has potential to affect couplings between moisture...

Abstract Numerical models run in non‐rotating radiative‐convective equilibrium (RCE) using prescribed sea surface temperatures (SSTs) show that convection can spontaneously aggregate into dry and moist areas, convective aggregation tends to increase with temperature. Using a general circulation model coupled an ocean mixed layer, we RCE the ocean‐atmosphere system exhibits some internal variability. This variability arises from interplay between mean temperature, SST gradients aggregation,...

This study explores the extent to which convective aggregation interacts with sea surface temperature (SST) and affects climate sensitivity. For this purpose, radiative-convective equilibrium simulations are run a general circulation model coupled an ocean mixed layer, several types of perturbations imposed ocean-atmosphere system. Convective turns out be much more sensitive in experiments than prescribed SST experiments. But changes induced by doubling CO2 concentration always smaller...

Abstract An idealized convection‐permitting simulation is performed to investigate the physical mechanisms responsible for nighttime offshore propagation of convection around tropical islands. island placed in middle a long, nonrotating channel oceanic domain with constant sea surface temperature. A strong diurnal cycle typical simulated, thermally forced breeze daytime and associated inland precipitation. Offshore land its simulated every night but varying extent. Gravity waves first second...

Abstract A set of idealized convection‐permitting simulations is performed to investigate the influence topography on physical mechanisms responsible for nocturnal offshore propagation convection around tropical islands. All have an island in middle a long channel oceanic domain, with constant sea surface temperature and without rotation. To diagnose impact topography, we compare flat simulation two mountain ranges different shapes. The over has strong diurnal cycle as clouds tend remain all...

Abstract We propose an algorithm to detect and track coastal precipitation systems we apply it 18 years of the high-resolution (8 km 30 min) Climate Prediction Center CMORPH estimates in tropics. Coastal Maritime Continent Central America contributes up 80% total rainfall. It also strongly diurnal cycle over land with largest contribution from lasting between 6 12 h contributions longer-lived peaking later day. While is more intense summer hemisphere, its timing independent seasons both...

Abstract Simulations using the convection‐permitting MesoNH model with imposed vertical motion document influence of large‐scale circulation on convective self‐aggregation. Results show that subsidence favors self‐aggregation in this and sensitivity includes a hysteresis: for weak subsidence, only one stationary state is found, without aggregation; moderate two states are aggregation without; large aggregated found. In state, area covered by deep convection decreases subsidence. Using...

Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Advances in Modeling Systems (JAMES). ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Convection self-aggregation CNRM-CM6-1: equilibrium transition sensitivity surface temperatureAuthorsDavidCoppinRomainRoehrigiDSee all authors David...

Abstract This study investigates the spontaneous self‐aggregation of convection in non‐rotating Radiative‐Convective Equilibrium (RCE) simulations performed by CNRM‐CM6‐1 General Circulation Model within framework RCE Intercomparison Project (RCEMIP). In this model, level at equilibrium, as quantified metrics based on moisture or moist static energy, strongly increases with sea surface temperature (SST). As it gets warmer, troposphere drier, high cloud cover diminishes dry regions, top rises...