A Comparative Study on Regional Drought Characterization Using Estimated Drought Indices in Conjunction with Trend Analysis in Peninsular India

2021 ◽  
pp. 91-110
Author(s):  
M. P. Akhtar ◽  
L. B. Roy ◽  
Abhishek Sinha
Keyword(s):  
Comparative Study ◽  
Trend Analysis ◽  
Drought Indices ◽  
Peninsular India ◽  
Regional Drought

scholarly journals Effects of different reference periods on drought index (SPEI) estimations from 1901 to 2014

2017 ◽  
Vol 21 (10) ◽  
pp. 4989-5007 ◽  
Author(s):  
Myoung-Jin Um ◽  
Yeonjoo Kim ◽  
Daeryong Park ◽  
Jeongbin Kim
Keyword(s):  
West Africa ◽  
East Asia ◽  
The United States ◽  
Spatial Extent ◽  
Drought Indices ◽  
Drought Severity ◽  
Climate Change Scenarios ◽  
Reference Period ◽  
Drought Characteristics ◽  
Regional Drought

Abstract. This study aims to understand how different reference periods (i.e., calibration periods) of climate data used to estimate drought indices influence regional drought assessments. Specifically, we investigate the influences of different reference periods on historical drought characteristics, such as the trend, frequency, intensity and spatial extent, using the standardized precipitation evapotranspiration index (SPEI) with a 12-month lag (SPEI-12), which was estimated from the datasets of the Climate Research Unit (CRU) and the University of Delaware (UDEL). For the 1901–1957 (P1) and 1958–2014 (P2) estimation periods, three different types of reference periods are used to compute the SPEI: P1 and P2 together, P1 and P2 separately and P1 only. Focusing on East Asia, Europe, the United States and West Africa, we find that the influence of the reference period is significant in East Asia and West Africa, with dominant drying trends from P1 to P2. The reference period influenced the assessment of drought characteristics, particularly the severity and spatial extent, whereas the influence on the frequency was relatively small. Finally, self-calibration, which is the most common practice for indices such as the SPEI, tends to underestimate the drought severity and spatial extent relative to the other approaches used in this study. Although the conclusions drawn in this study are limited by the use of two global datasets, they highlight the need for clarification of the reference period in drought assessments to better understand regional drought characteristics and the associated temporal changes, particularly under climate change scenarios.

Calculating regional drought indices using evapotranspiration (ET) distribution derived from Landsat7 ETM+data

2005 ◽  
Author(s):  
Hongjun Li ◽  
Yuping Lei ◽  
Li Zheng ◽  
Renzhao Mao
Keyword(s):  
Drought Indices ◽  
Regional Drought

scholarly journals Drought indices: aggregation is necessary or it is only the researcher's choice

2021 ◽  
Author(s):  
Muhammad Abrar Faiz ◽  
Yongqiang Zhang ◽  
Ning Ma ◽  
Faisal Baig ◽  
Farah Naz ◽  
...  
Keyword(s):  
Drought Index ◽  
Terrestrial Ecosystem ◽  
Natural Phenomenon ◽  
Drought Indices ◽  
Global Level ◽  
Composite Indices ◽  
Regional Drought ◽  
Evaluation And Monitoring ◽  
Effective Use ◽  
Simple Integration

Abstract Drought is a natural phenomenon caused by extreme and persistent precipitation shortage. This shortfall causes impacts on hydrology, agriculture, and the economy of a country. Secondly, drought/dryness has certain unique characteristics (severity, duration) among the natural hazards which makes it difficult to classify the persistent and subjective network of impacts. Drought classification is important to manage drought, allowing both quantitative evaluation and potential risk assessment planning. The simpler approach of drought indices made it easier for various researchers and organizations to classify drought. Several drought indices have been proposed at the national and global level to characterize hydrological, meteorological and agricultural droughts. Until now, there has been no widely agreed drought index among researchers. Therefore, researchers are trying to modify and reconstruct a simple, complete, and robust drought index for effective use and planning of the management of water resources. Due to the complex terrestrial ecosystem, researchers used to integrate multiple drought indexes for evaluation and monitoring of regional drought conditions. The reviewed composite or aggregated indices revealed that the researchers are mainly focused on regional climatic and environmental conditions, and differences of theoretical backgrounds while integrating a drought index. There is a lack of performance evaluation of these indices because usually the comparative analysis between the integrated index and earlier developed composite indices is not performed. Secondly, the developer researchers did not mention limitations such as data, which is considered a paramount issue while applying these indices in other regions. Therefore, there is still comprehensive work needed for the simple integration of drought indexes for general applications.

A comparative study of NOAA–AVHRR derived drought indices using change vector analysis

2006 ◽  
Vol 105 (1) ◽  
pp. 9-22 ◽  
Author(s):  
Y BAYARJARGAL ◽  
A KARNIELI ◽  
M BAYASGALAN ◽  
S KHUDULMUR ◽  
C GANDUSH ◽  
...  
Keyword(s):  
Comparative Study ◽  
Vector Analysis ◽  
Drought Indices ◽  
Noaa Avhrr ◽  
Change Vector Analysis ◽  
Change Vector

Comparative Study of Meteorological Drought Indices in Amravati District

2016 ◽  
Vol 31 (2) ◽  
pp. 1
Author(s):  
Gajanan U. Satpute ◽  
Chaitali V. Thakare ◽  
Suhas K. Upadhye
Keyword(s):  
Comparative Study ◽  
Meteorological Drought ◽  
Drought Indices

Overview of Application of Remote Sensing on Drought Monitoring in Inner Mongolia

2014 ◽  
Vol 955-959 ◽  
pp. 3735-3739
Author(s):  
Yin Tai Na
Keyword(s):  
Remote Sensing ◽  
Inner Mongolia ◽  
Research Work ◽  
Drought Monitoring ◽  
Drought Indices ◽  
Technology Application ◽  
Remote Sensing Technology ◽  
Stage Of Development ◽  
Sensing Technology ◽  
Regional Drought

Inner Mongolia is one of the most typical and severe dry provinces, drought is it’s main meteorological disasters. Remote sensing monitoring becomes irreplaceable effective means in the regional drought monitoring and drought mechanism research with the advantages of macro, rapid, objective, dynamic and real time. Inner Mongolia region is vast and flat, so suitable for carrying out the regional drought monitoring research with remote sensing technology. Application of meteorological drought indices and historical documents for drought monitoring and study is relatively more. However application of remote sensing technology for drought monitoring in Inner Mongolia is at the beginning stage of development. Further study and exploration is urgently needed. In this paper research work of application of remote sensing approach in drought monitoring in Inner Mongolia is summarized and existing problems are pointed out. Finally give some suggestions for the application of remote sensing technology in the drought monitoring in Inner Mongolia.

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