Changes in Drought Characteristics over China Using the Standardized Precipitation Evapotranspiration IndexSource: Journal of Climate:;2015:;volume( 028 ):;issue: 013::page 5430DOI: 10.1175/JCLI-D-14-00707.1Publisher: 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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contributor author | Chen, Huopo | |
contributor author | Sun, Jianqi | |
date accessioned | 2017-06-09T17:11:31Z | |
date available | 2017-06-09T17:11:31Z | |
date copyright | 2015/07/01 | |
date issued | 2015 | |
identifier issn | 0894-8755 | |
identifier other | ams-80858.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4223796 | |
description 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. | |
publisher | American Meteorological Society | |
title | Changes in Drought Characteristics over China Using the Standardized Precipitation Evapotranspiration Index | |
type | Journal Paper | |
journal volume | 28 | |
journal issue | 13 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-14-00707.1 | |
journal fristpage | 5430 | |
journal lastpage | 5447 | |
tree | Journal of Climate:;2015:;volume( 028 ):;issue: 013 | |
contenttype | Fulltext |