Open AccessSensitivity of Hadley Circulation to Physical Parameters and Resolution through Changing Upper-Tropospheric Ice Clouds Using a Global Cloud-System Resolving Model
Author(s) -
Shin-ichi Iga,
Hirofumi Tomita,
Yoko Tsushima,
Masaki Satoh
Publication year - 2011
Publication title -
journal of climate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.315
H-Index - 287
eISSN - 1520-0442
pISSN - 0894-8755
DOI - 10.1175/2010jcli3472.1
Subject(s) - environmental science , hadley cell , cloud forcing , atmospheric sciences , climatology , cloud fraction , cloud cover , precipitation , outgoing longwave radiation , liquid water content , troposphere , cloud feedback , climate sensitivity , climate model , geology , convection , meteorology , climate change , cloud computing , general circulation model , physics , oceanography , computer science , operating system
The relationship between upper-tropospheric ice cloud properties and the Hadley circulation intensity is examined through parameter sensitivity studies of global cloud-system-resolving simulations with explicit cloud convection. Experiments under a perpetual July condition were performed by changing parameters in the boundary layer and cloud microphysics schemes, with a mesh size of approximately 14 km. One additional experiment with a mesh size of approximately 7 km was also conducted. These experiments produced a variety of upper-cloud coverage and outgoing longwave radiation (OLR) distributions. The authors found that, as the upper-cloud coverage increased, the total precipitation decreased and the intensity of the Hadley circulation weakened because of energy balance constraints that radiative cooling are balanced by adiabatic warming. Interestingly, the ice water path was not correlated with the upper ice-loud coverage or OLR, indicating that the spatial coverage of upper ice clouds, rather than the ice water content, was the key factor in the radiation budget.