气候变化领域集成服务门户(CCPortal): Towards an advanced representation of precipitation over Morocco in a global climate model with resolution enhancement and empirical run-time bias corrections

CCPortal

DOI	10.1002/joc.8405
	Towards an advanced representation of precipitation over Morocco in a global climate model with resolution enhancement and empirical run-time bias corrections
	Balhane, Saloua; Cheruy, Frederique; Driouech, Fatima; El Rhaz, Khalid; Idelkadi, Abderrahmane; Sima, Adriana; Vignon, Etienne; Drobinski, Philippe; Chehbouni, Abdelghani
发表日期	2024
ISSN	0899-8418
EISSN	1097-0088
起始页码	44
结束页码	5
卷号	44 期号:5
英文摘要	Morocco, as a Mediterranean and North African country, is acknowledged as a climate change hotspot, where increased drought and related water resource shortages present a real challenge for human and natural systems. However, its geographic position and regional characteristics make the simulation of the distribution and variability of precipitation particularly challenging in the region. In this study, we propose an approach where the Laboratoire de Meteorologie Dynamique Zoom (LMDZ) GCM is run with a stretched grid configuration developed with enhanced resolution (35 km) over the region, and we apply run-time bias correction to deal with the atmospheric model's systematic errors on large-scale circulation. The bias-correction terms for wind and temperature are built using the climatological mean of the adjustment terms on tendency errors in an LMDZ simulation relaxed towards ERA5 reanalyses. The free reference run with the zoomed configuration is compared to two bias-corrected runs. The free run exhibits noticeable improvements in mean low-level circulation, high frequency variability and moisture transport and compares favourably to precipitation observations at the local scale. The mean simulated climate is substantially improved after bias correction w.r.t. to the uncorrected runs. At the regional scale, the bias-correction showed improvements in moisture transport and precipitation distribution, but no noticeable effect was observed in mean precipitation amounts, interannual variability and extreme events. To address the latter, model tuning after grid refinement and developing more scale-aware parameterizations are necessary. The observed improvements on the large-scale circulation suggest that the run-time bias correction can be used to drive regional climate models for a better representation of regional and local climate. It can also be combined with a posteriori bias correction methods to improve local precipitation simulation, including extreme events. The LMDZ AGCM is used in a refined grid configuration to investigate the impact of resolution enhancement and run-time bias correction on the simulation of the regional precipitation over Morocco. Six model simulations are compared to in-situ observations, ERA5 reanalysis and a range of gridded observation datasets for the period 1979-2014. The bias corrected refined-grid runs show improvements in both general circulation and regional precipitation variability and distribution. image
英文关键词	dynamical downscaling; general circulation model; LMDZ; Morocco; precipitation; run-time bias correction
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001174082700001
来源期刊	INTERNATIONAL JOURNAL OF CLIMATOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305773
作者单位	Mohammed VI Polytechnic University; Institut Polytechnique de Paris; Ecole Polytechnique; Universite PSL; Ecole Normale Superieure (ENS); Centre National de la Recherche Scientifique (CNRS); Sorbonne Universite; Mohammed VI Polytechnic University
推荐引用方式 GB/T 7714	Balhane, Saloua,Cheruy, Frederique,Driouech, Fatima,et al. Towards an advanced representation of precipitation over Morocco in a global climate model with resolution enhancement and empirical run-time bias corrections[J],2024,44(5).
APA	Balhane, Saloua.,Cheruy, Frederique.,Driouech, Fatima.,El Rhaz, Khalid.,Idelkadi, Abderrahmane.,...&Chehbouni, Abdelghani.(2024).Towards an advanced representation of precipitation over Morocco in a global climate model with resolution enhancement and empirical run-time bias corrections.INTERNATIONAL JOURNAL OF CLIMATOLOGY,44(5).
MLA	Balhane, Saloua,et al."Towards an advanced representation of precipitation over Morocco in a global climate model with resolution enhancement and empirical run-time bias corrections".INTERNATIONAL JOURNAL OF CLIMATOLOGY 44.5(2024).