Future global meteorological drought hot spots: A study based on CORDEX data
Yükleniyor...
Dosyalar
Tarih
2020-05-01
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Meteorological Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Two questions motivated this study: 1) Will meteorological droughts become more frequent and severe during the twenty-first century? 2) Given the projected global temperature rise, to what extent does the inclusion of temperature (in addition to precipitation) in drought indicators play a role in future meteorological droughts? To answer, we analyzed the changes in drought frequency, severity, and historically undocumented extreme droughts over 1981–2100, using the standardized precipitation index (SPI; including precipitation only) and standardized precipitation-evapotranspiration index (SPEI; indirectly including temperature), and under two representative concentration pathways (RCP4.5 and RCP8.5). As input data, we employed 103 high-resolution (0.448) simulations from the Coordinated Regional Climate Downscaling Experiment (CORDEX), based on a combination of 16 global circulation models (GCMs) and 20 regional circulation models (RCMs). This is the first study on global drought projections including RCMs based on such a large ensemble of RCMs. Based on precipitation only,;15% of the global land is likely to experience more frequent and severe droughts during 2071–2100 versus 1981–2010 for both scenarios. This increase is larger (;47% under RCP4.5,;49% under RCP8.5) when precipitation and temperature are used. Both SPI and SPEI project more frequent and severe droughts, especially under RCP8.5, over southern South America, the Mediterranean region, southern Africa, southeastern China, Japan, and southern Australia. A decrease in drought is projected for high latitudes in Northern Hemisphere and Southeast Asia. If temperature is included, drought characteristics are projected to increase over North America, Amazonia, central Europe and Asia, the Horn of Africa, India, and central Australia; if only precipitation is considered, they are found to decrease over those areas.
Açıklama
Anahtar Kelimeler
Drought, Precipitation, Climate change, Climate prediction, Temperature, Climate models, Evapotranspiration, River basins, Drought characteristics, Global circulation model, Mediterranean region, Meteorological drought, Northern Hemispheres, Regional circulation models, Southern South America, Standardized precipitation index
Kaynak
Journal of Climate
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
33
Sayı
9
Künye
Spinoni, J., Barbosa, P., Bucchignani, E., Cassano, J., Cavazos, T., Christensen, J. H., Öztürk, T., . . . Dosio, A. (2020). Future global meteorological drought hot spots: A study based on CORDEX data. Journal of Climate, 33(9), 3635-3661. doi:10.1175/JCLI-D-19-0084.1
