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An evapotranspirati...
An evapotranspiration deficit-based drought index to detect variability of terrestrial carbon productivity in the Middle East
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- Alsafadi, Karam (författare)
- School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, People's Republic of China
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- Al-Ansari, Nadhir, 1947- (författare)
- Luleå tekniska universitet,Geoteknologi
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- Mokhtar, Ali (författare)
- Department of Agricultural Engineering, Faculty of Agriculture, Cairo University, Giza 12613, Egypt ; State of Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University; Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, People's Republic of China
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- Mohammed, Safwan (författare)
- Institute of Land Use, Technology and Regional Development, University of Debrecen, Debrecen 4032, Hungary
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- Elbeltagi, Ahmed (författare)
- Agricultural Engineering Department, Faculty of Agriculture, Mansoura University, Mansoura 35516, Egypt; College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China
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- Sammen, Saad Sh (författare)
- Department of Civil Engineering, College of Engineering, University of Diyala, Diyala Governorate 32001, Iraq
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- Bi, Shuoben (författare)
- School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, People's Republic of China
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(creator_code:org_t)
- 2022-01-14
- 2022
- Engelska.
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Ingår i: Environmental Research Letters. - UK : Institute of Physics Publishing (IOPP). - 1748-9326. ; 17:1
- Relaterad länk:
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https://doi.org/10.1...
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https://ltu.diva-por... (primary) (Raw object)
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The primary driver of the land carbon sink is gross primary productivity (GPP), the gross absorption of carbon dioxide (CO2) by plant photosynthesis, which currently accounts for about one-quarter of anthropogenic CO2 emissions per year. This study aimed to detect the variability of carbon productivity using the standardized evapotranspiration deficit index (SEDI). Sixteen countries in the Middle East (ME) were selected to investigate drought. To this end, the yearly GPP dataset for the study area, spanning the 35 years (1982–2017) was used. Additionally, the Global Land Evaporation Amsterdam Model (GLEAM, version 3.3a), which estimates the various components of terrestrial evapotranspiration (annual actual and potential evaporation), was used for the same period. The main findings indicated that productivity in croplands and grasslands was more sensitive to the SEDI in Syria, Iraq, and Turkey by 34%, 30.5%, and 29.6% of cropland area respectively, and 25%, 31.5%, and 30.5% of grass land area. A significant positive correlation against the long-term data of the SEDI was recorded. Notably, the GPP recorded a decline of >60% during the 2008 extreme drought in the north of Iraq and the northeast of Syria, which concentrated within the agrarian ecosystem and reached a total vegetation deficit with 100% negative anomalies. The reductions of the annual GPP and anomalies from 2009 to 2012 might have resulted from the decrease in the annual SEDI at the peak 2008 extreme drought event. Ultimately, this led to a long delay in restoring the ecosystem in terms of its vegetation cover. Thus, the proposed study reported that the SEDI is more capable of capturing the GPP variability and closely linked to drought than commonly used indices. Therefore, understanding the response of ecosystem productivity to drought can facilitate the simulation of ecosystem changes under climate change projections.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Nyckelord
- gross primary productivity
- SEDI
- ecosystem dynamics
- terrestrial carbon
- GLEAM dataset
- Soil Mechanics
- Geoteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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