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    Changes in Drought Characteristics over China Using the Standardized Precipitation Evapotranspiration Index

    Source: Journal of Climate:;2015:;volume( 028 ):;issue: 013::page 5430
    Author:
    Chen, Huopo
    ,
    Sun, Jianqi
    DOI: 10.1175/JCLI-D-14-00707.1
    Publisher: American Meteorological Society
    Abstract: he standardized precipitation evapotranspiration index (SPEI) is computed and compared in China using reference evapotranspiration calculated using the Thornthwaite (TH) approach and the Penman?Monteith (PM) equation. The analysis reveals that SPEI_PM outperforms the SPEI_TH with regard to drought monitoring during the period 1961?2012 over China, especially in arid regions of China. Furthermore, the SPEI_PM also performs better with regard to observed variations in soil moisture and streamflow in China. Thus, changes in drought characteristics over China are detected on the basis of variations in the SPEI_PM. The results indicate that droughts over China exhibit pronounced decadal variations over the past 50 yr, with more frequent and severe droughts occurring before the 1980s and in the 2000s compared with the 1980s and 1990s. Since the late 1990s, droughts have become more frequent and severe across China, especially in some regions of northern China. Concurrently, consecutive drought events have also increased across China. This suggests that dry conditions in China have been enhanced in recent years. Further analyses illustrate that the temperature and precipitation anomalies exhibit different roles in detecting droughts across China, which is primarily due to the magnitude of their variations and different climate variability. Considering temperature and precipitation perturbations, droughts exhibit relatively larger responses to temperature fluctuations in northern China and relatively larger responses to precipitation anomalies in southern China.
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      Changes in Drought Characteristics over China Using the Standardized Precipitation Evapotranspiration Index

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4223796
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    contributor authorChen, Huopo
    contributor authorSun, Jianqi
    date accessioned2017-06-09T17:11:31Z
    date available2017-06-09T17:11:31Z
    date copyright2015/07/01
    date issued2015
    identifier issn0894-8755
    identifier otherams-80858.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223796
    description abstracthe standardized precipitation evapotranspiration index (SPEI) is computed and compared in China using reference evapotranspiration calculated using the Thornthwaite (TH) approach and the Penman?Monteith (PM) equation. The analysis reveals that SPEI_PM outperforms the SPEI_TH with regard to drought monitoring during the period 1961?2012 over China, especially in arid regions of China. Furthermore, the SPEI_PM also performs better with regard to observed variations in soil moisture and streamflow in China. Thus, changes in drought characteristics over China are detected on the basis of variations in the SPEI_PM. The results indicate that droughts over China exhibit pronounced decadal variations over the past 50 yr, with more frequent and severe droughts occurring before the 1980s and in the 2000s compared with the 1980s and 1990s. Since the late 1990s, droughts have become more frequent and severe across China, especially in some regions of northern China. Concurrently, consecutive drought events have also increased across China. This suggests that dry conditions in China have been enhanced in recent years. Further analyses illustrate that the temperature and precipitation anomalies exhibit different roles in detecting droughts across China, which is primarily due to the magnitude of their variations and different climate variability. Considering temperature and precipitation perturbations, droughts exhibit relatively larger responses to temperature fluctuations in northern China and relatively larger responses to precipitation anomalies in southern China.
    publisherAmerican Meteorological Society
    titleChanges in Drought Characteristics over China Using the Standardized Precipitation Evapotranspiration Index
    typeJournal Paper
    journal volume28
    journal issue13
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-14-00707.1
    journal fristpage5430
    journal lastpage5447
    treeJournal of Climate:;2015:;volume( 028 ):;issue: 013
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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