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[1] Cloud vertical structure influences the fluxes of precipitation and radiation throughout the atmosphere. This structure is not predicted in large-scale models but is instead applied in the form of ‘‘overlap assumptions.’’ In their current guise, overlap assumptions apply to the presence or absence of clouds, and new data sets have led to the development(More)
By SHAOCHENG XIE1¤ , KUAN-MAN XU2, RICHARD T. CEDERWALL1, PETER BECHTOLD3, ANTHONY D. DEL GENIO4, STEPHEN A. KLEIN5, DOUGLAS G. CRIPE6, STEVEN J. GHAN7, DAVID GREGORY8, SAM F. IACOBELLIS9 , STEVEN K. KRUEGER10, ULRIKE LOHMANN11, JON C. PETCH12 , DAVID A. RANDALL6, LEON D. ROTSTAYN13, RICHARD C. J. SOMERVILLE9, YOGESH C. SUD14, KNUT VON SALZEN15, GREGORY K.(More)
Cloud radar data collected at the Atmospheric Radiation Measurement (ARM) Program’s Southern Great Plains site were used to evaluate the properties of cirrus clouds that occurred in a cloud-resolving model (CRM) simulation of the 29-day summer 1997 intensive observation period (IOP). The simulation was ‘‘forced’’ by the large-scale advective temperature and(More)
Subtropical marine low cloud sensitivity to an idealized climate change is compared in six large eddy simulation (LES) models as part of CGILS. July cloud cover is simulated at three locations over the subtropical Northeast Pacific Ocean which are typified by cold sea surface temperatures (SSTs) under well-mixed stratocumulus, cool SSTs under decoupled(More)
Global cloud-top height statistics of marine-boundary-layer clouds are derived from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 aerosol and cloud layer products. The boundary-layer lapse rate in the northeast region of the Pacific Ocean is investigated using sea surface temperature (SST) data from the Advanced(More)
[1] The coupling of statistical cloud schemes with mass-flux convection schemes is addressed. Source terms representing the impact of convection are derived within the framework of prognostic equations for the width and asymmetry of the probability distribution function of total water mixing ratio. The accuracy of these source terms is quantified by(More)
[1] This modeling study compares the performance of eight single-column models (SCMs) and four cloud-resolving models (CRMs) in simulating shallow frontal cloud systems observed during a short period of the March 2000 Atmospheric Radiation Measurement (ARM) intensive operational period. Except for the passage of a cold front at the beginning of this period,(More)
Shaocheng Xie, Minghua Zhang, Mark Branson, Richard T. Cederwall, Anthony D. Del Genio, Zachary A. Eitzen, Steven J. Ghan, Sam F. Iacobellis, Karen L. Johnson, Marat Khairoutdinov, Stephen A. Klein, Steven K. Krueger, Wuyin Lin, Ulrike Lohmann, Mark A. Miller, David A. Randall, Richard C. J. Somerville, Yogesh C. Sud, Gregory K. Walker, Audrey Wolf,(More)
The influence of large-scale advective cooling and/or moistening on the quasi-equilibrium behavior of simulated, tropical oceanic cumulus ensembles is examined in this study. Two sensitivity simulations are performed by imposing time varying/invariant large-scale advective cooling effects and time invariant/varying large-scale advective moistening effects.(More)
[1] The use of narrow-beam, ground-based active remote sensors (such as cloud radars and lidars) for long-term observations provides valuable new measurements of the vertical structure of cloud fields. These observations might be quite valuable as tests for numerical simulations, but the vastly different spatial and temporal scales of the observations and(More)