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Evaluating the accuracy of two satellite-based Quantitative Precipitation Estimation products and their application for meteorological drought monitoring over the Lake Victoria Basin,East Africa

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Geo-Spatial Information Science 2022年第3期25卷 500-518页

作者： priyanko das Zhenke Zhang Hang Ren Center of African Studies Nanjing UniversityNanjingChina and School of Geographic and Oceanographic SciencesNanjing UniversityNanjingChina Center of African Studies Nanjing UniversityNanjingChina and School of Geographic and Oceanographic SciencesNanjing University Nanjing China Institute of Population Studies Nanjing University of Posts and TelecommunicationsNanjingJiangsu provinceChina

This study evaluates the high-resolution satellite estimated long-term precipitation data for monitor-ing the drought condition over the Lake Victoria Basin(LVB)from 1984 to *** Precipitation Indices(SPI)were used to capture the short,medium and long-term meteorological drought conditions at multiple time scales(i.e.3,6,and 12).For these,the following two primaries Quantitative Precipitation Estimation(QPEs)products were employed-1)Climate Hazards group Infra-Red Precipitation with Station(CHIRPS),and 2)the Precipitation Estimation from Remotely Sensed Information using Artificial Neural Network-Climate Data Record(PERSIANN-CDR).This dataset was compared based on the observation data obtained from the Climate Research Unit(CRU)over the nine selected regions surrounding lake *** performance of these two QPEs products was evaluated using seven statistical *** findings of this study indicate that the CHIRPS and PERSIANN-CDR datasets could capture the behavior of drought magnitude based on the time scale of SPI-3,SPI-6,*** results indicate that 2012 and 2017 are significant severe drought years in the recent decade over ***,the CHIRPS datasets provide good agreement(Correlation Coefficient(CC)=0.65)with observation,whereas PERSIANN-CDR present satisfactory results(CC=0.54).In addition,Hurst(H)exponent was used to predict the future drought trend and found that the CHIRPS performed well to predict the degree of drought ***,this study considers the CHIRPS product for near-real-time drought monitoring and PERSIANN-CDR for historical drought ***,the outcome from the H values is greater than 0.5,which indicates the future drought trend would be decreased over *** results are useful for developing the strategies for drought hazards and water resource management in LVB.

关键词： CHIRPS CRU hurst exponent PERSIANN-CDR SPI

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Time lag effect of vegetation response to seasonal precipitation in the Mara River Basin

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Ecological Processes 2023年第1期12卷 665-679页

作者： Shouming Feng Zhenke Zhang Shuhe Zhao Xinya Guo Wanyi Zhu priyanko das School of Geography and Oceanography Sciences Nanjing UniversityNanjing 210023China Institute of African Studies Nanjing UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Background Mara River Basin is an ecologically fragile area in East Africa,with a pattern of alternating wet and dry seasons shaped by periodic *** the regional biological traits and climatic change,the vegetation’s response to seasonal variation is complicated and frequently characterized by time *** study analyzed the variation of the Normalized Difference Vegetation Index(NDVI)and investigated its time lag to precipitation at the monthly *** characteristic peaks were proposed from the perspective of seasonal mechanisms and were quantified to assess the lag *** The results showed that the Anomaly Vegetation Index could identify low precipitation in 2006,2009,and *** NDVI showed an increasing trend in 75%of areas of the basin,while showed a decreased significance in 3.5%of areas,mainly in *** to the time lag,the 1-month lag effect dominated most months,and the spatiotemporal disparities were *** method considering the alternations of wet and dry seasons found that the time lag was approximately 30 *** on the time distribution of NDVI characteristic peaks,the average time lag was 35.5 days and increased with the range of *** The findings confirmed an increasing trend of NDVI in most regions from 2001 to 2020,while the trends were most obvious in the downstream related to human *** results could reflect the time lag of NDVI response to precipitation,and the 1-month lag effect dominated in most months with spatial *** NDVI characteristic peaks were found to be efficient indicators to assess the seasonal characteristics and had a great potential to quantify vegetation variation.

关键词： Mara River Basin NDVI Seasonal precipitation Characteristic peak Time lag

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基于人口规模的肯尼亚城市体系演变及空间联系

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经济地理 2022年第5期42卷 56-65页

作者：任航张振克 priyanko das 张耀宇南京邮电大学人口研究院/高质量发展评价研究院中国江苏南京210042 南京大学地理与海洋科学学院中国江苏南京210023 南京大学非洲研究所中国江苏南京210023

肯尼亚是非洲城市化速度较快的国家之一,也是“一带一路”倡议的重要覆盖区域。自1963年独立以来,肯尼亚的城市体系不断演变。随着中—肯投资合作的不断深入,肯尼亚的城市化发展迎来了新的机遇。文章基于肯尼亚1969—2019年的人口普查... 详细信息

肯尼亚是非洲城市化速度较快的国家之一,也是“一带一路”倡议的重要覆盖区域。自1963年独立以来,肯尼亚的城市体系不断演变。随着中—肯投资合作的不断深入,肯尼亚的城市化发展迎来了新的机遇。文章基于肯尼亚1969—2019年的人口普查资料和人口密度栅格数据,对肯尼亚的人口分布特征和城市体系演变过程进行了分析,并对城市体系结构进行了系统的划分。结果表明:①肯尼亚人口分布整体呈现“西、南高,东、北低”的空间格局,近20年来,人口重心持续西移。②肯尼亚城市体系规模较为集中,城市首位度过高。③肯尼亚城市体系中的节点城市空间分布不均,北部是人口的主要流出地缺少增长极核,城市空间联系松散。④城市发展受交通廊道驱动作用显著,南部地区已形成了蒙巴萨—内罗毕—基苏木东西向的城市发展轴线。文章还对种族隔离制度、“城市至上”发展理念和交通基础设建设等因素对肯尼亚不同时期城市体系演变的影响进行了讨论,并结合我国“一带一路”在非投资项目特点,提出了优化肯尼亚城市体系格局的建议。

关键词：人口分布城市体系空间联系肯尼亚“ 一带一路”倡议人口流动城市发展轴线交通廊道

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