Assessing the influence of microphysical and environmental parameter perturbations on orographic precipitation

Microphysical (MP) schemes contain parameters whose values can impact the amount and location of forecasted precipitation, and sensitivity is typically explored by perturbing one parameter at a time while holding the rest constant. Although much can be learned from these "one-at-a-time" studies, the results are limited as these methods do not allow for nonlinear interactions of multiple perturbed parameters. This study applies the Morris one-at-a-time (MOAT) method, a robust statistical tool allowing for simultaneous perturbation of numerous parameters, to explore orographic precipitation sensitivity to changes in microphysical and environmental parameters within an environment characteristic of an atmospheric river. Results show parameters associated with snow fall speed coefficient A(s) and density rho(s), ice-cloud water collection efficiency (ECI), rain accretion (WRA), relative humidity, zonal wind speed, and surface potential temperature cause the largest influence on simulated precipitation. MP and environmental parameter perturbations can cause precipitation changes of similar magnitude, but results vary by location on the mountain. Different environments are also tested, with A(s) being the most influential MP parameter regardless of environment. Fewer MP parameters influence precipitation in a faster-wind-speed environment, possibly due to the stronger dynamical forcing upwind and different wave dynamics downwind, compared to a slower-wind-speed environment. Finally, perturbing MP parameters within a single scheme can result in precipitation variations of similar magnitude compared to using entirely different microphysics schemes. MOAT results presented in this study have implications for Bayesian parameter estimation methods and stochastic parameterization within ensemble forecasting.

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Copyright 2019 American Meteorological Society.


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Author Morales, Annareli
Posselt, Derek J.
Morrison, Hugh
He, Fei
Publisher UCAR/NCAR - Library
Publication Date 2019-05-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:21:21.031250
Metadata Record Identifier edu.ucar.opensky::articles:22513
Metadata Language eng; USA
Suggested Citation Morales, Annareli, Posselt, Derek J., Morrison, Hugh, He, Fei. (2019). Assessing the influence of microphysical and environmental parameter perturbations on orographic precipitation. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d76m39x5. Accessed 15 February 2025.

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