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Subtropical Marine Low Stratiform Cloud Deck Spatial Errors in the E3SMv1 Atmosphere Model
Author(s) -
Brunke Michael A.,
Ma PoLun,
Reeves Eyre J. E. Jack,
Rasch Philip J.,
Sorooshian Armin,
Zeng Xubin
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl084747
Subject(s) - cloud computing , atmosphere (unit) , satellite , meteorology , environmental science , centroid , field (mathematics) , atmospheric models , atmospheric sciences , physics , computer science , astronomy , artificial intelligence , operating system , mathematics , pure mathematics
Marine low‐level clouds continue to be poorly simulated in models despite many studies and field experiments devoted to their improvement. Here we focus on the spatial errors in the cloud decks in the Department of Energy Earth system model (the Energy Exascale Earth System Model [E3SM]) relative to the satellite climatology by calculating centroid distances, area ratios, and overlap ratios. Since model dynamics is better simulated than clouds, these errors are attributed primarily to the model physics. To gain additional insight, we performed a sensitivity run in which model winds were nudged to those of reanalysis. This results in a large change (but not necessarily an improvement) in the simulated cloud decks. These differences between simulations are mainly due to the interactions between model dynamics and physics. These results suggest that both model physics (widely recognized) and its interaction with dynamics (less recognized) are important to model improvement in simulating these low‐level clouds.