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Effects of cumulus parameterization and land-surface hydrology schemes on Tibetan Plateau climate simulation during the wet season: insights from the RegCM4 model

Climate dynamics, 2021-10, Vol.57 (7-8), p.1853-1879 [Peer Reviewed Journal]

The Author(s) 2021 ;COPYRIGHT 2021 Springer ;The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 0930-7575 ;ISSN: 1432-0894 ;EISSN: 1432-0894 ;DOI: 10.1007/s00382-021-05781-1

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Title:
Effects of cumulus parameterization and land-surface hydrology schemes on Tibetan Plateau climate simulation during the wet season: insights from the RegCM4 model
Author: Wang, Xuejia ; Chen, Deliang ; Pang, Guojin ; Anwar, Samy A. ; Ou, Tinghai ; Yang, Meixue
Subjects: Air temperature ; Atmospheric moisture ; Auroral kilometric radiation ; Bias ; Bowen ratio ; Climate ; Climate models ; Climate simulation ; Climatology ; Cloud parameterization ; Clouds ; Convection ; Convective precipitation ; Cumulus clouds ; Destabilization ; Diurnal cycle ; Diurnal variations ; Earth and Environmental Science ; Earth and Related Environmental Sciences ; Earth Sciences ; Energy and water balance ; Environmental aspects ; Geophysics/Geodesy ; Geovetenskap och miljövetenskap ; Ground heating effect ; Heating ; Hydrology ; Infiltration capacity ; Moisture ; Moisture flux ; Net radiation ; Oceanography ; Parameterization ; Parameterization scheme ; Physics ; Plateaus ; Precipitation ; Radiation ; Radiation balance ; Rainy season ; Regional climate model ; Regional climate models ; Regional climates ; Satellite observation ; Simulation ; Spatial distribution ; Surface energy ; Surface properties ; Tibetan Plateau ; Transport ; Troposphere ; Vertical motion ; Water balance
Is Part Of: Climate dynamics, 2021-10, Vol.57 (7-8), p.1853-1879
Description: Dynamical downscaling generally performs poorly on the Tibetan Plateau (TP), due to the region’s complex topography and several aspects of model physics, especially convection and land surface processes. This study investigated the effects of the cumulus parameterization scheme (CPS) and land-surface hydrology scheme (LSHS) on TP climate simulation during the wet season using the RegCM4 regional climate model. To address these issues and seek an optimal simulation, we conducted four experiments at a 20 km resolution using various combinations of two CPSs (Grell and MIT-Emanuel), two LSHSs (the default TOPMODEL [TOP], and Variable Infiltration Capacity [VIC]). The simulations in terms of 2-m air temperature, precipitation (including large-scale precipitation [LSP] and convective precipitation [CP]), surface energy-water balance, as well as atmospheric moisture flux transport and vertical motion were compared with surface and satellite-based observations as well as the ERA5 reanalysis dataset for the period 2006–2016. The results revealed that the model using the Grell and TOP schemes better reproduced air temperature but with a warm bias, part of which could be significantly decreased by the MIT scheme. All schemes simulated a reasonable spatial distribution of precipitation, with the best performance in the experiment using the MIT and VIC schemes. Excessive precipitation was produced by the Grell scheme, mainly due to overestimated LSP, while the MIT scheme largely reduced the overestimation, and the simulated contribution of CP to total precipitation was in close agreement with the ERA5 data. The RegCM4 model satisfactorily captured diurnal cycles of precipitation amount and frequency, although there remained some differences in phase and magnitude, which were mainly caused by the CPSs. Relative to the Grell scheme, the MIT scheme yielded a weaker surface heating by reducing net radiation fluxes and the Bowen ratio. Consequently, anomalous moisture flux transport was substantially reduced over the southeastern TP, leading to a decrease in precipitation. The VIC scheme could also help decrease the wet bias by reducing surface heating. Further analysis indicated that the high CP in the MIT simulations could be attributed to destabilization in the low and mid-troposphere, while the VIC scheme tended to inhibit shallow convection, thereby decreasing CP. This study’s results also suggest that CPS interacts with LSHS to affect the simulated climate over the TP.
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 0930-7575
ISSN: 1432-0894
EISSN: 1432-0894
DOI: 10.1007/s00382-021-05781-1
Source: SpringerOpen website
ProQuest Central

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Effects of cumulus parameterization and land-surface hydrology schemes on Tibetan Plateau climate simulation during the wet season: insights from the RegCM4 model

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