气候变化领域集成服务门户(CCPortal): Assessment of moisture budget over West Africa using MERRA-2’s aerological model and satellite data

CCPortal

DOI	10.1007/s00382-018-4126-2
	Assessment of moisture budget over West Africa using MERRA-2’s aerological model and satellite data
	Igbawua T.; Zhang J.; Yao F.; Zhang D.
发表日期	2019
ISSN	0930-7575
起始页码	83
结束页码	106
卷号	52 期号:2020-01-02
英文摘要	The study assessed the performance of NASA’s Modern-Era Retrospective Analysis for Research and Applications (MERRA) and MERRA-2 aerological (P–E) model in reproducing the salient features of West Africa water balance including its components from 1980 to 2013. In this study we have shown that recent reanalysis efforts have generated imbalances between regional integrated precipitation (P) and surface evaporation (E), and the effect is more in the newly released MERRA-2. The atmospheric water balance of MERRA and MERRA-2 were inter-compared and thereafter compared with model forecast output of European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-I) and Japanese 55-year Reanalysis (JRA-55). Results indicated that a bias of 12–20 (5–13) mm/month in MERRA-2 (ERA-I) leads to the classification of the Sahel (14°N–20°N) as a moisture source during the West African Summer Monsoon. Comparisons between MERRA/MERRA-2 and prognostic fields from two ERA-I and JRA-55 indicated that the average P–E in MERRA is 18.94 (52.24) mm/month which is less than ERA-I (JRA-55) over Guinea domain and 25.03 (4.53) mm/month greater than ERA-I (JRA-55) over the Sahel. In MERRA-2, average P–E* indicated 25.76 (59.06) mm/month which is less than ERA-I (JRA-55) over Guinea and 73.72 (94.22) mm/month less than ERA-I (JRA-55) over the Sahel respectively. These imbalances are due to adjustments in data assimilation methods, satellite calibration and observational data base. The change in convective P parameterization and increased re-evaporation of P in MERRA-2 is suggestive of the cause of positive biases in P and E. The little disagreements between MERRA/MERRA-2 and CRU precipitation highlights one of the major challenges associated with climate research in West Africa and major improvements in observation data and surface fluxes from reanalysis remain vital. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Aerological model; Climate; MERRA; MERRA-2; Moisture budget; West Africa
语种	英语
scopus关键词	atmospheric modeling; atmospheric moisture; climate modeling; comparative study; data assimilation; evaporation; precipitation (climatology); satellite data; water budget; weather forecasting; West Africa
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146636
作者单位	College of Computer Sciences and Technology, Qingdao Uiversity, Qingdao, 266071, China; University of Chinese Academy of Sciences, Beijing, 100049, China; University of Agriculture, Makurdi, Benue State, Nigeria
推荐引用方式 GB/T 7714	Igbawua T.,Zhang J.,Yao F.,等. Assessment of moisture budget over West Africa using MERRA-2’s aerological model and satellite data[J],2019,52(2020-01-02).
APA	Igbawua T.,Zhang J.,Yao F.,&Zhang D..(2019).Assessment of moisture budget over West Africa using MERRA-2’s aerological model and satellite data.Climate Dynamics,52(2020-01-02).
MLA	Igbawua T.,et al."Assessment of moisture budget over West Africa using MERRA-2’s aerological model and satellite data".Climate Dynamics 52.2020-01-02(2019).