An analytical approximation of urban heat and dry islands and their impact on convection triggering

It is well known that cities increase air and surface temperatures compared to their rural surroundings, the so-called urban heat island (UHI) effect. However, associated changes in atmospheric humidity (also as dry island, UDI) convection triggering remain largely unexplored it still unclear how modifications of energy budget influence diurnal evolution temperature Atmospheric Boundary Layer (ABL) ultimately control initiation convective clouds. Here we quantify impact different settings free conditions on UHI, UDI, triggers by means a zero-order model ABL. Specifically, derive an approximate solution for urban-rural fluxes ABL potential investigate crossing between height lifting condensation level (LCL) which proxy We show areas are generally warmer drier, thus causing both LCL heights. response ABL-LCL non-linear there exists range atmosphere imperviousness can