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Copyright of Plateau Meteorology is the property of Plateau Meteorology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

As a primary tool in climate change research at the watershed scale, the role of horizontal resolution in regional climate simulations needs to be evaluated. This paper investigates the role over the Huang-Huai-Hai (HHH) River basin using a regional climate model, RegCM4, coupled with the National Center for Atmospheric Research (NCAR) Community Land Model, version 4.5 (CLM4.5) including the modules of CN and DV (RCM_CLM4.5). The model is driven by ERA-Interim reanalysis data, and the time period is 1990—2010. Model validation shows that RCM_CLM4. 5 at 50 km and 25 km resolutions can reproduce the present climate well, including the spatial distribution of winter and summer mean temperature and precipitation, the annual cycles of temperature and precipitation, and the climate extremes. However, some biases can also be found. For example, compared with the observation, cold and warm biases are found in the winter and summer mean temperature, respectively; wet biases are found in the precipitation. Comparison between the two simulations, better performance of the magnitude and spatial distribution of mean temperature is found in the simulation at 25 km resolution; while for precipitation, better performance is observed in the one at 50 km resolution; little difference is found for the climate extremes. In general, results from this study indicate a very low sensitivity of present climate in this region to model resolution and can provide a reference for the application of this model in future climate change research over the HHH River basin. [ABSTRACT FROM AUTHOR]

Using the Weather Research and Forecasting (WRF) model, a heavy rainfall in central China during 30 June to 1 Jul 2016 is simulated to explore the effects of different horizontal resolutions and microphysical schemes. The results show that:(1) all of the simulations can reproduce the rainfall well, but simulated rainstorm areas are smaller than observations. The total rainfall is more sensitive to horizontal resolutions than to microphysical schemes, although the big rainstorm is sensitive to both horizontal resolutions and microphysical schemes. With different horizontal resolutions, microphysical schemes and cumulus schemes affect the performance of the rainfall forecast in common. TS scores of 24-hour accumulated precipitation show that the simulation with 12 km horizontal resolution andthe Lin scheme performs the best in extremely rainstorm simulation. (2) The evolution of hydrometeors simulated by different microphysical schemes largely depends on themselves. The Lin scheme simulates more ice and graupel, but less snow. The Thompson scheme simulates more snow, but less ice and graupel. The Morrison shceme simulates the similar contents among three types of ice hydrometeors. The Lin scheme underestimates the ice-water content significantly. The Thompson and Morrison scheme overestimate the ice-water content significantly. (3) Updraft strength simulated by different schemes affects the distribution of hydrometeors in the mature stage. The Lin scheme simulates upright updraft and weak upper flow so that most of the ice hydrometeors are limited in convective system. The Thompson and Morrison schemes simulate slantwise updraft and strong upper flow so that most of ice hydrometeors flow with upper flow.

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)