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Space-time characterization of drought events and their impacts on vegetation in Central Asia

(2018) JOURNAL OF HYDROLOGY. 564. p.1165-1178
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Abstract
Understanding the space-time structure and characteristics of drought is crucial for drought risk mitigation and forecasting efforts. In this paper, the drought events are identified by an improved 3-dimensional clustering algorithm. The 3-month Standardized Precipitation Evapotranspiration Index (SPEI3) is calculated based on the Climatic Research Unit (CRU) dataset from January 1966 to December 2015 to construct the longitude-latitudetime space. The characteristics of these identified events are described by a series of indicators such as duration, severity, intensity, affected area, centroids and track path after which the spatial pattern and temporal evolution are studied. In addition, the Vegetation Health Index (VHI), Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) are also included to investigate the possible impact of drought on the vegetation health. Results show that a total of 60 persisting drought events for at least 3 months have been identified in Central Asia. The most severe drought event occurred between May 1974 and January 1976 with a duration of 21 months and an affected area of 5.77 million km(2). Most events have a duration between 3 and 5 months. In addition, the droughts in Central Asia tend to have an east-west trajectory. Seasonally, the study area experienced more drought months in spring and summer. During the recent 35 years, there has been a slowly increasing thermal stress and a significantly decreasing soil moisture stress that causes an overall decreasing drought stress on vegetation health.
Keywords
CLIMATE-CHANGE, WATER-RESOURCES, SPATIOTEMPORAL CHARACTERISTICS, METEOROLOGICAL DROUGHTS, TEMPORAL VARIABILITY, SOUTHWEST CHINA, SOIL-MOISTURE, TRENDS, PRECIPITATION, SEVERITY, Drought, Space-time characteristics, Vegetation response, SPEI, Central, Asia

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Chicago
Guo, Hao, Anming Bao, Felix Ndayisaba, Tie Liu, Guli Jiapaer, Attia M El-Tantawi, and Philippe De Maeyer. 2018. “Space-time Characterization of Drought Events and Their Impacts on Vegetation in Central Asia.” Journal of Hydrology 564: 1165–1178.
APA
Guo, H., Bao, A., Ndayisaba, F., Liu, T., Jiapaer, G., El-Tantawi, A. M., & De Maeyer, P. (2018). Space-time characterization of drought events and their impacts on vegetation in Central Asia. JOURNAL OF HYDROLOGY, 564, 1165–1178.
Vancouver
1.
Guo H, Bao A, Ndayisaba F, Liu T, Jiapaer G, El-Tantawi AM, et al. Space-time characterization of drought events and their impacts on vegetation in Central Asia. JOURNAL OF HYDROLOGY. 2018;564:1165–78.
MLA
Guo, Hao, Anming Bao, Felix Ndayisaba, et al. “Space-time Characterization of Drought Events and Their Impacts on Vegetation in Central Asia.” JOURNAL OF HYDROLOGY 564 (2018): 1165–1178. Print.
@article{8576774,
  abstract     = {Understanding the space-time structure and characteristics of drought is crucial for drought risk mitigation and forecasting efforts. In this paper, the drought events are identified by an improved 3-dimensional clustering algorithm. The 3-month Standardized Precipitation Evapotranspiration Index (SPEI3) is calculated based on the Climatic Research Unit (CRU) dataset from January 1966 to December 2015 to construct the longitude-latitudetime space. The characteristics of these identified events are described by a series of indicators such as duration, severity, intensity, affected area, centroids and track path after which the spatial pattern and temporal evolution are studied. In addition, the Vegetation Health Index (VHI), Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) are also included to investigate the possible impact of drought on the vegetation health. Results show that a total of 60 persisting drought events for at least 3 months have been identified in Central Asia. The most severe drought event occurred between May 1974 and January 1976 with a duration of 21 months and an affected area of 5.77 million km(2). Most events have a duration between 3 and 5 months. In addition, the droughts in Central Asia tend to have an east-west trajectory. Seasonally, the study area experienced more drought months in spring and summer. During the recent 35 years, there has been a slowly increasing thermal stress and a significantly decreasing soil moisture stress that causes an overall decreasing drought stress on vegetation health.},
  author       = {Guo, Hao and Bao, Anming and Ndayisaba, Felix and Liu, Tie and Jiapaer, Guli and El-Tantawi, Attia M and De Maeyer, Philippe},
  issn         = {0022-1694},
  journal      = {JOURNAL OF HYDROLOGY},
  keywords     = {CLIMATE-CHANGE,WATER-RESOURCES,SPATIOTEMPORAL CHARACTERISTICS,METEOROLOGICAL DROUGHTS,TEMPORAL VARIABILITY,SOUTHWEST CHINA,SOIL-MOISTURE,TRENDS,PRECIPITATION,SEVERITY,Drought,Space-time characteristics,Vegetation response,SPEI,Central,Asia},
  language     = {eng},
  pages        = {1165--1178},
  title        = {Space-time characterization of drought events and their impacts on vegetation in Central Asia},
  url          = {http://dx.doi.org/10.1016/j.jhydrol.2018.07.081},
  volume       = {564},
  year         = {2018},
}

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