干旱区生态环境知识资源中心(Arid): Unsupervised segmentation and clustering time series approach to Southern Africa rainfall regime changes

Arid

DOI	10.1002/gdj3.228
	Unsupervised segmentation and clustering time series approach to Southern Africa rainfall regime changes
	Chipindu, Lovemore; Mupangwa, Walter; Nyagumbo, Isaiah; Zaman-Allah, Mainassara
通讯作者	Chipindu, L
来源期刊	GEOSCIENCE DATA JOURNAL
ISSN	2049-6060
出版年	2023
英文摘要	Analysis of hydro-climatological time series and spatiotemporal dynamics of meteorological variables has become critical in the context of climate change, especially in Southern African countries where rain-fed agriculture is predominant. In this work, we compared modern unsupervised time series and segmentation approaches and commonly used time series models to analyse rainfall regime changes in the coastal, sub-humid and semi-arid regions of Southern Africa. Rainfall regimes change modelling and prediction inform farming strategies especially when choosing measures for mixed crop-livestock farming systems, as farmers can decide to do rainwater harvesting and moisture conservation or supplementary irrigation if water resources are available. The main goal of this study was to predict/identify rainfall cluster trends over time using regression with hidden logistic process (RHLP) or hidden Markov model regression (HMMR) supplemented by autoregressive integrated moving average (ARIMA) and Facebook Prophet models. Historical time series rainfall data was sourced from meteorological services departments for selected site over an average period of 55 years. Commonly used approaches forecasted an upward rainfall trend in the coastal and sub-humid regions and a declining trend in semi-arid areas with high variability between and within seasons. For all sites, Ljung-Box Test Statistics suggested the existence of autocorrelation in rainfall time series data. Prediction capabilities were investigated using the root mean square error (RMSE), mean absolute error (MAE) and mean absolute percentage error (MAPE) which indicated not much difference between ARIMA and Facebook Prophet models. RHLP and HMMR offered a unique clustering and segmentation approach examining between and within-season rainfall variability. A maximum of 20 unique rainfall clusters with similar trend characteristics were determined as going beyond this brought non-significant difference to regime changes. A clear trend was exhibited from 1980 going backwards as compared to recent years signifying how unpredictable is rainfall in Southern Africa. The unsupervised approaches predicted a clear cluster trend in coastal than in sub-humid and semi-arid and the performance was assessed using Akaike information criteria and log-likelihood which showed improvement in prediction power as the number of segmentation clusters approaches 20.
英文关键词	ARIMA coastal Facebook Prophet hidden Markov model regression regression with hidden logistic process semi-arid sub-humid
类型	Article ; Data Paper ; Early Access
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001085568800001
WOS关键词	CLIMATE-CHANGE ; MODEL
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396731
推荐引用方式 GB/T 7714	Chipindu, Lovemore,Mupangwa, Walter,Nyagumbo, Isaiah,et al. Unsupervised segmentation and clustering time series approach to Southern Africa rainfall regime changes[J],2023.
APA	Chipindu, Lovemore,Mupangwa, Walter,Nyagumbo, Isaiah,&Zaman-Allah, Mainassara.(2023).Unsupervised segmentation and clustering time series approach to Southern Africa rainfall regime changes.GEOSCIENCE DATA JOURNAL.
MLA	Chipindu, Lovemore,et al."Unsupervised segmentation and clustering time series approach to Southern Africa rainfall regime changes".GEOSCIENCE DATA JOURNAL (2023).