Preprint Article Version 1 This version is not peer-reviewed

Impact of Grid Nudging Parameters on Dynamical Downscaling during Summer over Chinese Mainland

Version 1 : Received: 14 September 2017 / Approved: 15 September 2017 / Online: 15 September 2017 (11:20:07 CEST)
Version 2 : Received: 25 September 2017 / Approved: 25 September 2017 / Online: 25 September 2017 (16:55:35 CEST)

A peer-reviewed article of this Preprint also exists.

Mai, X.; Ma, Y.; Yang, Y.; Li, D.; Qiu, X. Impact of Grid Nudging Parameters on Dynamical Downscaling during Summer over Mainland China. Atmosphere 2017, 8, 184. Mai, X.; Ma, Y.; Yang, Y.; Li, D.; Qiu, X. Impact of Grid Nudging Parameters on Dynamical Downscaling during Summer over Mainland China. Atmosphere 2017, 8, 184.

Journal reference: Atmosphere 2017, 8, 184
DOI: 10.3390/atmos8100184

Abstract

The grid nudging technique is often used in regional climate dynamical downscaling to make the simulated large-scale fields consistent with the driving fields. In this study, we focused on two specific questions about grid nudging: (1) which nudged variable had a larger impact on the downscaling results and (2) what was the “optimal” grid nudging strategy for each nudged variable to achieve better downscaling result during summer over the Chinese mainland. To solve this queries, 41 3-month long simulations for the summer of 2009 and 2010 were performed using the Weather Research and Forecasting model (WRF) to downscale National Centers for Environmental Prediction (NCEP) Final Operational Global Analysis (FNL) data to a 30-km horizontal resolution. The results showed that nudging horizontal wind or temperature had significant influence on the simulation of almost all conventional meteorological elements; nudging water vapor mainly affected the precipitation, humidity, and 500 hPa temperature. Moreover, the optimum nudging scheme varied with simulated regions and layers. As a whole, the optimal nudging time was one hour or three hours for nudging wind, three hours for nudging temperature, and one hour for nudging water vapor. The optimal nudged level was above the planetary boundary layer for almost every nudged variable.

Subject Areas

grid nudging; downscaling; WRF; nudged variable; nudging time; nudged level

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