On the long‐term changes of drought over China (1948–2012) from different methods of potential evapotranspiration estimations

Wang, Guojie; Gong, Tiantian; Lü, Jian; Lou, Dan; Hagan, Daniel Fiifi Tawia; Chen, Tiexi

doi:10.1002/joc.5475

Cited by 37 publications

(25 citation statements)

References 48 publications

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“…Using more sophisticated physically based ET 0 models (e.g. the PM model) is also recommended in the drought‐related literature (Zhang et al ., ; ; Wang et al ., ).…”

Section: Resultsmentioning

confidence: 97%

Drought trend, frequency and extremity across a wide range of climates over Iran

Nouri

Homaee

2020

Meteorological Applications

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This study was conducted to assess drought trend, frequency and extremity during 1966-2012 over widely different climatic regimes in Iran. Two drought indicators, i.e. the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI), were employed to characterize the droughts at 3, 6, 12 and 24 month time scales. In addition, the Mann-Kendall test was used for trend analysis. There was a declining (drying) trend in the SPI and SPEI at 76% and 85% or more, respectively, of the investigated sites. The SPIs were not well correlated with the SPEIs over the hyper-arid/arid regions, demonstrating the significance of reference evapotranspiration (ET 0 ) inclusion for drought identification over these water-limited areas. Furthermore, the SPEI appears not to be calculated reliably using temperature-based ET 0 equations and also when wind speed data are missing at hyper-arid/arid sites. More frequent droughts were detected during 1998-2012, which can be attributed to more recurrent La Niña events in this period. Seasonally, a greater increment in drought frequency at 3 and 6 month time scales was found in the March-April-May period. The most extended droughts and the most intensive dry months were also captured over 1998-2012 for most locations. In the majority of cases, it seems that the La Niña events caused long and severe droughts. The drought frequency increment and the most extreme drought incidences seem to have adversely impacted the agricultural sector over the studied areas. Consequently, there is a need for adaptation to negate the influences of frequent intensive dry episodes in Iran.

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“…Using more sophisticated physically based ET 0 models (e.g. the PM model) is also recommended in the drought‐related literature (Zhang et al ., ; ; Wang et al ., ).…”

Section: Resultsmentioning

confidence: 97%

Drought trend, frequency and extremity across a wide range of climates over Iran

Nouri

Homaee

2020

Meteorological Applications

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“…As suggested by previous studies (Peng and Zhou, ; Wang et al ., ; Liu et al ., ), Northwest China experienced a wetting trend during the past decades. Our analysis confirmed this trend by showing that most areas of ASRC experience a wetter summer climate.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Changes of concurrent drought and heat extremes in the arid and semi‐arid regions of China during 1961–2014

Luo

2019

Atmospheric Science Letters

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Arid and semi‐arid regions of China (ASRC) are increasingly threatened by drought. Especially when drought and heat extremes coincide, the resultant impact would be even more harmful to human society and the natural environment. This study investigates the spatio‐temporal changes in concurrent drought and heat extremes in ASRC during 1961–2014. Summer heat extremes quantified by hot day (HD), warm night (WN), daytime (DHW), and nighttime heatwave (NHW) are examined. On average, the concurrent nighttime events (concurrent drought‐WN and drought‐NHW) increases by 2.7 times faster than daytime ones (concurrent drought‐HD and drought‐DHW), and they appear more frequently in eastern than western ASRC. We also find that all four types of concurrent events have been significantly increased over the past decades. Compared to daytime (i.e., HD and DHW), the concurrent events at nighttime (i.e., WN and NHW) increased even more rapidly. During the study period, concurrent drought‐DHW (drought‐NHW) climbed up at the rate of 0.03 (0.08) events decade−1 and concurrent drought‐HD (drought‐WN) increased by 0.17 (0.45) days decade−1. Geographically, eastern ASRC exhibited a more pronounced increasing trend than the west. Given the increasing threats of concurrent events, we suggest that more attention should be paid to these compound events in future climate change studies.

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“…The trend is considered decreasing if Z is negative and computed probability is greater than the level of significance. This methodology has been successfully employed in many related studies thus far [63,82,83].…”

Section: Mann-kendall (Mk) Testmentioning

confidence: 99%

Trend in Extreme Precipitation Indices Based on Long Term In Situ Precipitation Records over Pakistan

Bhatti

Wang

Ullah

et al. 2020

Water

Self Cite

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Assessing the long-term precipitation changes is of utmost importance for understanding the impact of climate change. This study investigated the variability of extreme precipitation events over Pakistan on the basis of daily precipitation data from 51 weather stations from 1980-2016. The non-parametric Mann–Kendall, Sen’s slope estimator, least squares method, and two-tailed simple t-test methods were used to assess the trend in eight precipitation extreme indices. These indices were wet days (R1 ≥1 mm), heavy precipitation days (R10 ≥ 10 mm), very heavy precipitation days (R20 ≥ 20 mm), severe precipitation (R50 ≥ 50 mm), very wet days (R95p) defining daily precipitation ≥ 95 percentile, extremely wet days (R99p) defining daily precipitation ≥ 99 percentile, annual total precipitation in wet days (PRCPTOT), and mean precipitation amount on wet days as simple daily intensity index (SDII). The study is unique in terms of using high stations’ density, extended temporal coverage, advanced statistical techniques, and additional extreme indices. Furthermore, this study is the first of its kind to detect abrupt changes in the temporal trend of precipitation extremes over Pakistan. The results showed that the spatial distribution of trends in different precipitation extreme indices over the study region increased as a whole; however, the monsoon and westerlies humid regions experienced a decreasing trend of extreme precipitation indices during the study period. The results of the sequential Mann–Kendall (SqMK) test showed that all precipitation extremes exhibited abrupt dynamic changes in temporal trend during the study period; however, the most frequent mutation points with increasing tendency were observed during 2011 and onward. The results further illustrated that the linear trend of all extreme indices showed an increasing tendency from 1980- 2016. Similarly, for elevation, most of the precipitation extremes showed an inverse relationship, suggesting a decrease of precipitation along the latitudinal extent of the country. The spatiotemporal variations in precipitation extremes give a possible indication of the ongoing phenomena of climate change and variability that modified the precipitation regime of Pakistan. On the basis of the current findings, the study recommends that future studies focus on underlying physical and natural drivers of precipitation variability over the study region.

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On the long‐term changes of drought over China (1948–2012) from different methods of potential evapotranspiration estimations

Cited by 37 publications

References 48 publications

Drought trend, frequency and extremity across a wide range of climates over Iran

Drought trend, frequency and extremity across a wide range of climates over Iran

Changes of concurrent drought and heat extremes in the arid and semi‐arid regions of China during 1961–2014

Trend in Extreme Precipitation Indices Based on Long Term In Situ Precipitation Records over Pakistan

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