Relationship of drought frequency and severity with range of annual temperature variation

Amrit, Kumar; Pandey, Rajendra; Mishra, Surendra Kumar; Daradur, Mihail

doi:10.1007/s11069-018-3247-6

Cited by 16 publications

(6 citation statements)

References 23 publications

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“…In this experiment, the effect of location was influenced by the temperature. The results of the current study corroborate studies by Amrit et al (2018), Dahler et al (1995), and Pushpa and Madhu (2019).…”

Section: Hcn-p Of Sorghum Cultivarssupporting

confidence: 92%

Hydrocyanic acid potential in sorghums reduce with maturity and increase with temperature

Ouma,

Cheruiyot,

Ogendo

2023

Agronomy Journal

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Sorghum [Sorghum bicolor (L) Moench] is an important fodder however; its use is limited by the presence of dhurrin that disintegrates to yield hydrocyanic acid (HCN) which is toxic to livestock. Twenty sorghum cultivars were evaluated in two sites in the year 2019 and three sites in the year 2020 (Egerton, Rongai, and Marigat representing cool, warm, and hot regions in Kenya) in randomized complete block design with three replications and plants sampled at booting and dough growth stages to measure hydrocyanic acid potential (HCN‐p) of sorghum. Analysis of variance revealed significant effects of both two way and higher order interactions of cultivar (G), location (L), stage (S) by season (S) i.e., G×L×S, G×L×Y, G×Y, G×S, and L×S, L×Y. Main factors (cultivar, location, and stage) also have a significant effect on HCN‐p of sorghum. ‘IESV9110’ had the highest HCN‐p (146.09 mg/kg) while EST 37 had the lowest HCN‐p (83.97 mg/kg) across all locations. There was a progressive increase in HCN‐p from a cooler region, to a warmer and a hotter region, respectively. HCN‐p on average was 47.8% less at Egerton University than Marigat, 35.4% higher in Marigat compared to Rongai, and 14.41% less in Rongai compared to Egerton. Sorghum sampled at booting stage had averagely higher HCN‐p (133.94 mg/kg) compared to dough stage (91.31 mg/kg). The average air temperatures during the growing seasons were 24‐27.3°C, 21.8‐22.9°C, and 16.5‐19.5°C for Marigat, Rongai, and Egerton, respectively. Growing temperature needs consideration when recommending fodder sorghum with low HCN‐p.This article is protected by copyright. All rights reserved

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Section: Hcn-p Of Sorghum Cultivarssupporting

confidence: 92%

Hydrocyanic acid potential in sorghums reduce with maturity and increase with temperature

Ouma,

Cheruiyot,

Ogendo

2023

Agronomy Journal

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“…However, it is still suggested that the more complicated PET calculation method, like FAO-56 Penman-Monteith (Valiantzas, 2013) can be applied, especially for the further projections of drought changes in the region. Meanwhile, as revealed by many previous studies, increasing temperature trend can amplify the drought severity in different regions (e.g., Amrit et al, 2018). In this study, we found that temperature increased significantly in SWM season and suggested the increasing trend of temperature might also contribute to the decadal enhancement of drought characteristics in the wet region of MRB.…”

Section: Discussionsupporting

confidence: 71%

“…For example, Thomas and Prasannakumar (2016) observed that the decreasing rainfall during SWM in Kerala India contributes to short-term meteorological droughts, however, the increase of NEM rainfall aids the reduction of drought severity in the region. Meanwhile, in specific years, drought severity can also be affected by the anomaly of temperature or evapotranspiration (e.g., Livneh and Hoerling, 2016;Luo et al, 2017;Amrit et al, 2018).…”

Section: Influence Of Rainfall and Temperature Change On Interdecadal Difference Of Droughtsmentioning

confidence: 99%

Interdecadal Change of Drought Characteristics in Mahaweli River Basin of Sri Lanka and the Associated Atmospheric Circulation Difference

Lin

Shelton

2020

Front. Earth Sci.

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Understanding the spatiotemporal characteristics of drought at the river basin scale is vital for water resources management. In this study, the interdecadal variation of drought characteristics over the Mahaweli River Basin (MRB) in Sri Lanka was investigated for the 1985-2015 period, using the Standardized Precipitation Evapotranspiration Index (SPEI). Remarkable interdecadal change of yearly drought characteristics between 1985-1999 and 2000-2015 periods in the wet region of MRB can be found for mediumterm and long-term drought, with indications of that more frequent and severer drought events as well as longer duration of total drought months, occurred during 2000-2015 period. Furthermore, interdecadal enhancement of yearly drought in the wet region can be attributed to changes of seasonal drought in Southwest Monsoon (SWM) season, and this is coherent with the interdecadal shift of the SWM rainfall amount from wet to dry situations since the year 2000. However, no significant interdecadal change of drought was found in the intermediate and dry regions of MRB, as well as the short-term drought in the wet region. The interdecadal difference of atmospheric circulation demonstrates that the South Asian monsoon was weakened after 2000, which is accompanied by the weakening of monsoon trough, reduced cross-equatorial flow from the southern hemisphere from wind circulation at 850 hPa, and positive anomalies of geopotential height at 500 hPa over South Asian region. The weakening of South Asian monsoon leads to lesser moisture transport from the northwest Indian Ocean to Sri Lanka, inducing net moisture divergence anomalies in Sri Lanka, and ultimately results in more drought events during SWM season in the region since the year 2000.

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“…One of the possible factors preventing an increase in the moisture deficit during recent warming is the mitigation of climate continentality, i.e. decrease in magnitude of temperature fluctuations 40 . This decrease at the seasonal scale reduces the rate of warming in the summer months, and at the daily scale leads to lower maximum temperatures, thus reducing potential evapotranspiration and loss of soil moisture 41 , 42 .…”

Section: Discussionmentioning

confidence: 99%

Climate change and tree growth in the Khakass-Minusinsk Depression (South Siberia) impacted by large water reservoirs

Zhirnova

Belokopytova

Meko

et al. 2021

Sci Rep

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Regional and local climate change depends on continentality, orography, and human activities. In particular, local climate modification by water reservoirs can reach far from shore and downstream. Among the possible ecological consequences are shifts in plant performance. Tree-ring width of affected trees can potentially be used as proxies for reservoir impact. Correlation analysis and t-tests were applied to climatic data and tree-ring chronologies of Pinus sylvestris L. and Larix sibirica Ledeb. from moisture-deficit habitats in the intermontane Khakass-Minusinsk Depression, to assess modification of climate and tree growth by the Krasnoyarsk and Sayano-Shushenskoe Reservoirs on the Yenisei River. Abrupt significant cooling in May–August and warming in September-March occurred after the launch of the turbines in dams, more pronounced near the Sayano-Shushenskoe dam (up to – 0.5 °C in summer and to + 3.5 °C in winter) than near the Krasnoyarsk Reservoir headwaters (– 0.3 °C and + 1.4 °C). Significant lengthening of the warm season was also found for temperature thresholds 0–8 °C. Shifts of seasonality and intensity occurred in climatic responses of all tree-ring chronologies after development of water reservoirs. Patterns of these shifts, however, depended on species-specific sensitivity to climatic modification, distance from reservoirs, and physiographic regions. Mitigation of climate continentality and extremes by reservoirs appears to have offset possible negative effects of warming on tree growth.

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Relationship of drought frequency and severity with range of annual temperature variation

Cited by 16 publications

References 23 publications

Hydrocyanic acid potential in sorghums reduce with maturity and increase with temperature

Hydrocyanic acid potential in sorghums reduce with maturity and increase with temperature

Interdecadal Change of Drought Characteristics in Mahaweli River Basin of Sri Lanka and the Associated Atmospheric Circulation Difference

Climate change and tree growth in the Khakass-Minusinsk Depression (South Siberia) impacted by large water reservoirs

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