Abstract:
:Afforestation is an important approach to mitigate global warming. Its complex interactions with the climate system, however, makes it controversial. Afforestation is expected to be effective in the tropics where biogeochemical and biogeophysical effects act in concert; however, its potential in the large semi-arid regions remains insufficiently explored. Here, we use a Global Climate Model to provide a process-based demonstration that implementing measured characteristics of a successful semi-arid afforestation system (2000 ha, ~300 mm mean annual precipitation) over large areas (~200 million ha) of similar precipitation levels in the Sahel and North Australia leads to the weakening and shifting of regional low-level jets, enhancing moisture penetration and precipitation (+0.8 ± 0.1 mm d-1 over the Sahel and +0.4 ± 0.1 mm d-1 over North Australia), influencing areas larger than the original afforestation. These effects are associated with increasing root depth and surface roughness and with decreasing albedo. This results in enhanced evapotranspiration, surface cooling and the modification of the latitudinal temperature gradient. It is estimated that the carbon sequestration potential of such large-scale semi-arid afforestation can be on the order of ~10% of the global carbon sink of the land biosphere and would overwhelm any biogeophysical warming effects within ~6 years.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Yosef G,Walko R,Avisar R,Tatarinov F,Rotenberg E,Yakir Ddoi
10.1038/s41598-018-19265-6subject
Has Abstractpub_date
2018-01-17 00:00:00pages
996issue
1issn
2045-2322pii
10.1038/s41598-018-19265-6journal_volume
8pub_type
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