气候变化领域集成服务门户(CCPortal): Evaluation of GPM-IMERG and TRMM-3B42 precipitation products over Pakistan

CCPortal

DOI	10.1016/j.atmosres.2020.105341
	Evaluation of GPM-IMERG and TRMM-3B42 precipitation products over Pakistan
	Arshad M.; Ma X.; Yin J.; Ullah W.; Ali G.; Ullah S.; Liu M.; Shahzaman M.; Ullah I.
发表日期	2021
ISSN	0169-8095
卷号	249
英文摘要	Understanding the performance of remotely-sensed precipitation with rain gauge as reference is essential before their application in estimating multiple processes. In current study, the Global Precipitation Measurements from Integrated Multi-satellite Retrievals (GPM-IMERG) and Tropical Rainfall Measuring Mission (TRMM-3B42) precipitation products were evaluated, taking the rain gauge data as a reference for the period of 2004 to 2018 over Pakistan. The data at daily, monthly, annual and seasonal timescales were evaluated using multiple statistical (three continuous and four categorical) error metrics. The Satellite Precipitation Products (SPPs) showed consistent precipitation climatology with some regional differences. All SPPs overall performed well in the central and southern regions compared to the northern region of study area. Evaluation revealed that the performance of SPPs was influenced by topography, while the error characteristics of SPPs were dependent on the precipitation intensity and climatic condition of the region. The SPPs were able to capture the extreme precipitation events (95th percentile) across different climatic regions. The highest values for probability of detection (POD), critical success index (CSI), and accuracy (ACC) at the rate of 0.7, 0.4, and 0.9 were observed respectively, while the lowest value for false alarm ratio (FAR) is 0.4. The IMERG final run harmonizes rain gauges very closely in plain and medium elevation regions, while root mean square difference greater than 20 mm/month were observed for high altitude. The spatial distribution of correlation coefficients with the values greater than 0.7 suggest that selected SPPs well captured the seasonality and mutual comparison shows that IMERG final run performed well, followed by TRMM-3B42, whereas in winter and pre-monsoon, the IMERG early run and IMERG late run captured higher precipitation values in the northeast of the study area. The results can help the researchers to select reliable SPPs as an alternate source of rain gauge in the country and other adjoining regions and the data evaluation information can help algorithm developers to rectify the errors and improve the selected SPPs. © 2020 Elsevier B.V.
英文关键词	Evaluation; GPM-IMERG; Pakistan; Precipitation products; TRMM-3B42
语种	英语
scopus关键词	Errors; Outsourcing; Rain; Topography; Extreme precipitation events; Global precipitation measurements; Precipitation climatology; Precipitation intensity; Probability of detection; Root mean square differences; Satellite precipitation products; Tropical rainfall measuring missions; Rain gages; accuracy assessment; algorithm; climate conditions; comparative study; precipitation intensity; raingauge; seasonality; spatial distribution; topography; TRMM; Pakistan
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145207
作者单位	School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Pakistan Meteorological Department, Sector H-8/2, Islamabad, 44000, Pakistan; School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, 210044, China; School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Department of Atmospheric and Oceanic Sciences, Fudan University, Shanghai, 200433, China
推荐引用方式 GB/T 7714	Arshad M.,Ma X.,Yin J.,et al. Evaluation of GPM-IMERG and TRMM-3B42 precipitation products over Pakistan[J],2021,249.
APA	Arshad M..,Ma X..,Yin J..,Ullah W..,Ali G..,...&Ullah I..(2021).Evaluation of GPM-IMERG and TRMM-3B42 precipitation products over Pakistan.Atmospheric Research,249.
MLA	Arshad M.,et al."Evaluation of GPM-IMERG and TRMM-3B42 precipitation products over Pakistan".Atmospheric Research 249(2021).