Projected Impacts of Climate Change on Drought Patterns Over East Africa
Investigation of the pressing impacts of climate change on drought is vital for sustainable societal and ecosystem functioning. The magnitude of how much the drought will change and the way how droughts would affect society and the environment are inadequately addressed over East Africa. This study...
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Published in | Earth's future Vol. 8; no. 7 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bognor Regis
John Wiley & Sons, Inc
01.07.2020
Wiley |
Subjects | |
Online Access | Get full text |
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Abstract | Investigation of the pressing impacts of climate change on drought is vital for sustainable societal and ecosystem functioning. The magnitude of how much the drought will change and the way how droughts would affect society and the environment are inadequately addressed over East Africa. This study aimed at assessing future drought changes using an ensemble of five Global Climate Models (GCMs) in the Coupled Model Intercomparison Project (CMIP5) over East Africa. To this end, drought characteristics were investigated under the Representative Concentration Pathways (RCPs) 2.6, 4.5, and 8.5 in the near term (the 2020s; 2011–2040), midcentury (2050s; 2041–2070), and end of century (2080s; 2071–2,100). The changes of the Standardized Precipitation Index (SPI) and Standardized Precipitation‐Evapotranspiration Index (SPEI) were first compared, and the SPEI was used for measuring future droughts as it showed stronger changes due to its inclusion of temperature effects. Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 36%, and 54% under RCP 2.6, 4.5, and 8.5, respectively, with the areas affected by extreme drought increasing more rapidly than severe and moderate droughts. Spatially, drought event, duration, frequency and intensity would increase in Sudan, Tanzania, Somalia, and South Sudan, but generally decrease in Kenya, Uganda, and Ethiopian highlands. Results also confirm that drought changes over East Africa follow the “dry gets drier and wet gets wetter” paradigm. The findings provide important guidance for improving identification of causes, minimizing the impacts and enhancing the resilience to droughts in East Africa.
Key Points
We examined the impact of changes in precipitation and temperature on drought characteristics over East Africa during 1981–2099
Precipitation and temperature will increase over East Africa; however, the temperature impact is dominant leading to extreme droughts
Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 37%, and 54% under RCP 2.6, 4.5, and 8.5, respectively |
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AbstractList | Investigation of the pressing impacts of climate change on drought is vital for sustainable societal and ecosystem functioning. The magnitude of how much the drought will change and the way how droughts would affect society and the environment are inadequately addressed over East Africa. This study aimed at assessing future drought changes using an ensemble of five Global Climate Models (GCMs) in the Coupled Model Intercomparison Project (CMIP5) over East Africa. To this end, drought characteristics were investigated under the Representative Concentration Pathways (RCPs) 2.6, 4.5, and 8.5 in the near term (the 2020s; 2011–2040), midcentury (2050s; 2041–2070), and end of century (2080s; 2071–2,100). The changes of the Standardized Precipitation Index (SPI) and Standardized Precipitation‐Evapotranspiration Index (SPEI) were first compared, and the SPEI was used for measuring future droughts as it showed stronger changes due to its inclusion of temperature effects. Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 36%, and 54% under RCP 2.6, 4.5, and 8.5, respectively, with the areas affected by extreme drought increasing more rapidly than severe and moderate droughts. Spatially, drought event, duration, frequency and intensity would increase in Sudan, Tanzania, Somalia, and South Sudan, but generally decrease in Kenya, Uganda, and Ethiopian highlands. Results also confirm that drought changes over East Africa follow the “dry gets drier and wet gets wetter” paradigm. The findings provide important guidance for improving identification of causes, minimizing the impacts and enhancing the resilience to droughts in East Africa. Investigation of the pressing impacts of climate change on drought is vital for sustainable societal and ecosystem functioning. The magnitude of how much the drought will change and the way how droughts would affect society and the environment are inadequately addressed over East Africa. This study aimed at assessing future drought changes using an ensemble of five Global Climate Models (GCMs) in the Coupled Model Intercomparison Project (CMIP5) over East Africa. To this end, drought characteristics were investigated under the Representative Concentration Pathways (RCPs) 2.6, 4.5, and 8.5 in the near term (the 2020s; 2011–2040), midcentury (2050s; 2041–2070), and end of century (2080s; 2071–2,100). The changes of the Standardized Precipitation Index (SPI) and Standardized Precipitation‐Evapotranspiration Index (SPEI) were first compared, and the SPEI was used for measuring future droughts as it showed stronger changes due to its inclusion of temperature effects. Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 36%, and 54% under RCP 2.6, 4.5, and 8.5, respectively, with the areas affected by extreme drought increasing more rapidly than severe and moderate droughts. Spatially, drought event, duration, frequency and intensity would increase in Sudan, Tanzania, Somalia, and South Sudan, but generally decrease in Kenya, Uganda, and Ethiopian highlands. Results also confirm that drought changes over East Africa follow the “dry gets drier and wet gets wetter” paradigm. The findings provide important guidance for improving identification of causes, minimizing the impacts and enhancing the resilience to droughts in East Africa. We examined the impact of changes in precipitation and temperature on drought characteristics over East Africa during 1981–2099 Precipitation and temperature will increase over East Africa; however, the temperature impact is dominant leading to extreme droughts Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 37%, and 54% under RCP 2.6, 4.5, and 8.5, respectively Investigation of the pressing impacts of climate change on drought is vital for sustainable societal and ecosystem functioning. The magnitude of how much the drought will change and the way how droughts would affect society and the environment are inadequately addressed over East Africa. This study aimed at assessing future drought changes using an ensemble of five Global Climate Models (GCMs) in the Coupled Model Intercomparison Project (CMIP5) over East Africa. To this end, drought characteristics were investigated under the Representative Concentration Pathways (RCPs) 2.6, 4.5, and 8.5 in the near term (the 2020s; 2011–2040), midcentury (2050s; 2041–2070), and end of century (2080s; 2071–2,100). The changes of the Standardized Precipitation Index (SPI) and Standardized Precipitation‐Evapotranspiration Index (SPEI) were first compared, and the SPEI was used for measuring future droughts as it showed stronger changes due to its inclusion of temperature effects. Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 36%, and 54% under RCP 2.6, 4.5, and 8.5, respectively, with the areas affected by extreme drought increasing more rapidly than severe and moderate droughts. Spatially, drought event, duration, frequency and intensity would increase in Sudan, Tanzania, Somalia, and South Sudan, but generally decrease in Kenya, Uganda, and Ethiopian highlands. Results also confirm that drought changes over East Africa follow the “dry gets drier and wet gets wetter” paradigm. The findings provide important guidance for improving identification of causes, minimizing the impacts and enhancing the resilience to droughts in East Africa. Key Points We examined the impact of changes in precipitation and temperature on drought characteristics over East Africa during 1981–2099 Precipitation and temperature will increase over East Africa; however, the temperature impact is dominant leading to extreme droughts Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 37%, and 54% under RCP 2.6, 4.5, and 8.5, respectively Abstract Investigation of the pressing impacts of climate change on drought is vital for sustainable societal and ecosystem functioning. The magnitude of how much the drought will change and the way how droughts would affect society and the environment are inadequately addressed over East Africa. This study aimed at assessing future drought changes using an ensemble of five Global Climate Models (GCMs) in the Coupled Model Intercomparison Project (CMIP5) over East Africa. To this end, drought characteristics were investigated under the Representative Concentration Pathways (RCPs) 2.6, 4.5, and 8.5 in the near term (the 2020s; 2011–2040), midcentury (2050s; 2041–2070), and end of century (2080s; 2071–2,100). The changes of the Standardized Precipitation Index (SPI) and Standardized Precipitation‐Evapotranspiration Index (SPEI) were first compared, and the SPEI was used for measuring future droughts as it showed stronger changes due to its inclusion of temperature effects. Drought area in East Africa is likely to increase at the end of the 21st century by 16%, 36%, and 54% under RCP 2.6, 4.5, and 8.5, respectively, with the areas affected by extreme drought increasing more rapidly than severe and moderate droughts. Spatially, drought event, duration, frequency and intensity would increase in Sudan, Tanzania, Somalia, and South Sudan, but generally decrease in Kenya, Uganda, and Ethiopian highlands. Results also confirm that drought changes over East Africa follow the “dry gets drier and wet gets wetter” paradigm. The findings provide important guidance for improving identification of causes, minimizing the impacts and enhancing the resilience to droughts in East Africa. |
Author | Kebede, Asfaw Gebremicael, T. G. Liu, Xingcai Leng, Guoyong Xu, Ximeng Yun, Xiaobo Haile, Gebremedhin Gebremeskel Tang, Qiuhong Hosseini‐Moghari, Seyed‐Mohammad |
Author_xml | – sequence: 1 givenname: Gebremedhin Gebremeskel orcidid: 0000-0003-2807-5330 surname: Haile fullname: Haile, Gebremedhin Gebremeskel organization: Tigray Agricultural Research Institute – sequence: 2 givenname: Qiuhong orcidid: 0000-0002-0886-6699 surname: Tang fullname: Tang, Qiuhong email: tangqh@igsnrr.ac.cn organization: University of Chinese Academy of Sciences – sequence: 3 givenname: Seyed‐Mohammad orcidid: 0000-0001-6766-5283 surname: Hosseini‐Moghari fullname: Hosseini‐Moghari, Seyed‐Mohammad organization: Chinese Academy of Sciences – sequence: 4 givenname: Xingcai orcidid: 0000-0001-5726-7353 surname: Liu fullname: Liu, Xingcai organization: Chinese Academy of Sciences – sequence: 5 givenname: T. G. orcidid: 0000-0002-2521-4772 surname: Gebremicael fullname: Gebremicael, T. G. organization: Tigray Agricultural Research Institute – sequence: 6 givenname: Guoyong surname: Leng fullname: Leng, Guoyong organization: Chinese Academy of Sciences – sequence: 7 givenname: Asfaw orcidid: 0000-0002-6496-7216 surname: Kebede fullname: Kebede, Asfaw organization: Haramaya University, Institute of Technology – sequence: 8 givenname: Ximeng orcidid: 0000-0002-0058-5040 surname: Xu fullname: Xu, Ximeng organization: Chinese Academy of Sciences – sequence: 9 givenname: Xiaobo surname: Yun fullname: Yun, Xiaobo organization: Chinese Academy of Sciences |
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SubjectTerms | 20th century 21st century Climate change Climate models Datasets Displaced persons Drought Drought characteristics Drought patterns East Africa Environmental changes Environmental impact Evapotranspiration Extreme drought Extreme weather Food security Global climate Global climate models Population growth Precipitation Rain Regions SPEI SPI Standardized precipitation index Temperature effects uncertainty |
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Title | Projected Impacts of Climate Change on Drought Patterns Over East Africa |
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