First Assessment of Cloud‐Land Coupling in LASSO Large‐Eddy Simulations
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- Department of Atmospheric and Oceanic Science University of Maryland College Park MD USA, Earth System Science Interdisciplinary Center University of Maryland College Park MD USA
- Department of Atmospheric and Oceanic Science University of Maryland College Park MD USA, Earth System Science Interdisciplinary Center University of Maryland College Park MD USA, Lawrence Livermore National Laboratory Livermore CA USA
- Department of Earth and Atmospheric Science University of Houston Houston TX USA, Institute of Climate and Atmospheric Science University of Houston Houston TX USA
Abstract To enhance our understanding of cloud simulations over land, this study provides the first assessment of coupling between cloud and land surface in the Large‐Eddy Simulation (LES) Atmospheric Radiation Measurement Symbiotic Simulation and Observation (LASSO) activity for the shallow convection scenario. The analysis of observation data reveals a diurnal cycle of cloud‐land coupling, which co‐varies with surface fluxes. However, coupled (or decoupled) cumulus clouds are inadequately simulated, manifesting as a too‐high (or low) occurrence frequency during the afternoon. This discrepancy is mirrored by the overestimated cloud liquid water path and cloud‐top height. These overestimations are linked to the overpredicted boundary‐layer development and the easier trigger of shallow convection misrepresented in LES runs. Our study underscores the need to improve the representations of boundary‐layer processes and cloud‐land interactions within LES to better simulate shallow clouds in the future.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344; SC0022919; SC0024185
- OSTI ID:
- 2406698
- Report Number(s):
- LLNL--JRNL-862921; e2024GL109774
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 14 Vol. 51; ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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