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  • Air–Sea Interactions from the Diurnal to the Intraseasonal during the PISTON, MISOBOB, and CAMP2Ex Observational Campaigns in the Tropics x
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Adam V. Rydbeck, Tommy G. Jensen, and Matthew R. Igel

rainfall events in the tropical western Pacific Ocean initiated in close proximity to mesoscale SST gradients. The onset of rainfall preferentially occurred adjacent to local warm patches, in close proximity to minima of the negative Laplacian of SST. Using formulas derived to estimate the magnitude of convergence induced by the SST field, the forcing by mesoscale SST gradients was an order of magnitude larger than the environmental background convergence, thus driving the regional excitation of

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Emily M. Riley Dellaripa, Eric D. Maloney, Benjamin A. Toms, Stephen M. Saleeby, and Susan C. van den Heever

time (1200 LT bin), convergence over the western Luzon mountain location (i.e., near 121°E) commences in all three runs, but is particularly noticeable and stronger in the true and doubled topography runs compared to the flat run (cf. Figs. 8 – 10 , { u , w } vectors). The elevated warmer potential temperature values in the doubled versus flat topography run during the 1200 LT bin likely enhance the upslope valley-to-mountain circulation via direct thermal forcing (e.g., Houze 2012 ; Kirshbaum

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Michael B. Natoli and Eric D. Maloney

greater contrast between land and sea due to a difference in thermal inertia, resulting in a strong sea-breeze circulation and more vigorous convection. Surface insolation is strongly reduced by phase 6, providing less forcing for a strong diurnal cycle. Fig . 11. ERA5 (a) daily mean surface downwelling shortwave radiation anomalies by BSISO phase relative to the May–October mean and (b) BSISO anomalies of the diurnal amplitude of surface zonal wind relative to May–October composite diurnal cycle of

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