English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This talk presents three-dimensional numerical sim- ulations of oceanic trade cumulus clouds underlying stratocumulus clouds. It is based on a Global En- ergy and Water Experiment (GEWEX) Cloud Sys- tem Study (GCSS) model intercomparison that is loosely based on observed conditions during the At- lantic Trade Cumulus Experiment (ATEX). It is mo- tivated by the importance of this cloud type to global cloud radiative forcing, and its role as a feeder sys- tem for deep convection in the tropics. This study focuses on the sensitivity of the modeled cloud field to the domain size and the grid spacing by studying two sequences of simulations with different domain widths of 6.4 and 20.2 kilometers. Each sequence contains simulations where the horizontal mesh spac- ing ranged from 10 to 80 meters and the vertical from 5 to 40 m. The combination of large domain size and small grid resolution (up to 2.5 billion grid-cells) pro- vides an unprecedented perspective on this type of convection. This is in contrast to Prior LES simula- tions which have often used domains a few kilome- ters wide. The larger domain size considered here is comparable to the grid resolution of a typical cur- rent mesoscale model (a similar resolution will soon be achieved in some global weather forecast models), and can better represent the potential horizontal vari- ability achievable within a mesoscale grid cell. Oceanic trade cumulus convection is an intermedi- ate regime in the Hadley cell, which at its poleward end originates as a stratocumulus-capped boundary layer under strong large-scale subsidence. The sub- tropical stratocumulus to trade cumulus transition (STCT) is observed to be gradual, starting with the formation of shallow cumuli feeding into the stratocu- mulus clouds, followed by the breakup of the overly-

Effects of Domain Size and Numerical Resolution on the Simulation of Shallow Cumulus Convection