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310 results on '"Dosio, Alessandro"'

5. West African Monsoon System's Responses to Global Ocean–Regional Atmosphere Coupling.

Author

Tamoffo, Alain T., Weber, Torsten, Cabos, William, Monerie, Paul-Arthur, Cook, Kerry H., Sein, Dmitry V., Dosio, Alessandro, Klutse, Nana A. B., Akinsanola, Akintomide A., and Jacob, Daniela

Subjects
DOWNSCALING (Climatology), OCEAN temperature, OCEAN-atmosphere interaction, ATMOSPHERIC models, ATMOSPHERIC circulation
Abstract

This study explores the added value (AV) of a regional Earth system model (ESM) compared to an atmosphere-only regional climate model (RCM) in simulating West African monsoon (WAM) rainfall. The primary goals are to foster discussions on the suitability of coupled RCMs for WAM projections and deepen our understanding of ocean–atmosphere coupling's influence on the WAM system. The study employs results from dynamical downscaling of the ERA-Interim reanalysis and Max Plank Institute ESM, low resolution (MPI-ESM-LR), by two RCMs, atmosphere only (REMO) and REMO coupled with Max Planck Institute Ocean Model (MPIOM) (ROM), at ∼25-km horizontal resolution. Results show that in regions distant from coupling domain boundaries such as West Africa (WA), constraint conditions from ERA-Interim are more beneficial than coupling effects. REMO, reliant on oceanic sea surface temperatures (SSTs) from observations and influenced by ERA-Interim, is biased under coupling conditions, although coupling offers potential advantages in representing heat and mass fluxes. Contrastingly, as intended, coupling improves SSTs and monsoon fluxes' relationships under ESM-forced conditions. In this latter case, the coupling features a dipole-like spatial structure of AV, improving precipitation over the Guinea Coast but degrading precipitation over half of the Sahel. Our extensive examination of physical processes and mechanisms underpinning the WAM system supports the plausibility of AV. Additionally, we found that the monsoonal dynamics over the ocean respond to convective activity, with the Sahara–Sahel surface temperature gradient serving as the maintenance mechanism. While further efforts are needed to enhance the coupled RCM, we advocate for its use in the context of WAM rainfall forecasts and projections. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Future Global Meteorological Drought Hot Spots : A Study Based on CORDEX Data

Author

Spinoni, Jonathan, Barbosa, Paulo, Bucchignani, Edoardo, Cassano, John, Cavazos, Tereza, Christensen, Jens H., Christensen, Ole B., Coppola, Erika, Evans, Jason, Geyer, Beate, Giorgi, Filippo, Hadjinicolaou, Panos, Jacob, Daniela, Katzfey, Jack, Koenigk, Torben, Laprise, René, Lennard, Christopher J., Kurnaz, M. Levent, Li, Delei, Llopart, Marta, McCormick, Niall, Naumann, Gustavo, Nikulin, Grigory, Ozturk, Tugba, Panitz, Hans-Juergen, da Rocha, Rosmeri Porfirio, Rockel, Burkhardt, Solman, Silvina A., Syktus, Jozef, Tangang, Fredolin, Teichmann, Claas, Vautard, Robert, Vogt, Jürgen V., Winger, Katja, Zittis, George, and Dosio, Alessandro

Published
2020

21. Process-oriented assessment of RCA4 regional climate model projections over the Congo Basin under 1.5∘C2∘C and 1.5∘C2∘C global warming levels: influence of regional moisture fluxes

Author

Tamoffo, Alain T., Moufouma-Okia, Wilfran, Dosio, Alessandro, James, Rachel, Pokam, Wilfried M., Vondou, Derbetini A., Fotso-Nguemo, Thierry C., Guenang, Guy Merlin, Kamsu-Tamo, Pierre H., Nikulin, Grigory, Longandjo, Georges-Noel, Lennard, Christopher J., Bell, Jean-Pierre, Takong, Roland R., Haensler, Andreas, Tchotchou, Lucie A. Djiotang, and Nouayou, Robert

Published
2019
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27. Drought variability, changes and hot spots across the African continent during the historical period (1928–2017).

Author

Tall, Moustapha, Sylla, Mouhamadou Bamba, Dajuma, Alima, Almazroui, Mansour, Houteta, Djan'na Koubodana, Klutse, Nana Ama Browne, Dosio, Alessandro, Lennard, Christopher, Driouech, Fatima, Diedhiou, Arona, and Giorgi, Filippo

Subjects
DROUGHT management, DROUGHTS, EMERGENCY management, ORTHOGONAL functions, GLOBAL warming
Abstract

The spatiotemporal variability of meteorological droughts, its changes and hot spots location across Africa are analysed for the period spanning 1928–2017 using the Standardized Precipitation Index (SPI) applied to the precipitation products from the Climatic Research Unit (CRU), University of Delaware (UDEL) and Global Precipitation Climatology Centre (GPCC). Spatially, an analysis based on rotational empirical orthogonal function identifies five regions of similar drought variability, namely the Sahel, East Africa, East Southern Africa, West Southern Africa and the Gulf of Guinea. Temporally, the most common periods of drought occurrence are the 1970s, the 1980s and, to a lesser extent, the 1990s. Changes in drought characteristics for the intermediate past (1958–1987) and recent past (1988–2017) compared to the far past (1928–1957) indicate robust increases of drought duration, frequency and severity in the Sahel, and to a lower extent in the Gulf of Guinea, some areas of Central Africa, part of Southern Africa and over Madagascar. These changes are stronger (weaker) along the Sahel during the intermediate past (recent past) and stronger (weaker) over Central and Southern Africa and Madagascar during the recent past (intermediate past). As a consequence, drought hot spots, mostly driven by severity during the regions' wet season, are identified in areas confined in the Sahel during the intermediate past and in regions mainly over Central and Southern Africa and Madagascar during the recent past. Our results are useful for drought disaster risk management across Africa and provide a valuable reference for future drought analysis under global warming conditions. [ABSTRACT FROM AUTHOR]

Published
2023
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45. COSMO-CLM regional climate simulations in the Coordinated Regional Climate Downscaling Experiment (CORDEX) framework: a review

Author

Sørland, Silje Lund, Brogli, Roman, Pothapakula, Praveen Kumar, Russo, Emmanuele, Van de Walle, Jonas, Ahrens, Bodo, Anders, Ivonne, Bucchignani, Edoardo, Davin, Édouard L., Demory, Marie-Estelle, Dosio, Alessandro, Feldmann, Hendrik, Früh, Barbara, Geyer, Beate, Keuler, Klaus, Lee, Donghyun, Li, Delei, van Lipzig, Nicole P. M., Min, Seung-Ki, Panitz, Hans-Jürgen, Rockel, Burkhardt, Schär, Christoph, Steger, Christian, Thiery, Wim, Geography, and Hydrology and Hydraulic Engineering

Subjects
MODEL INTERCOMPARISON PROJECT, Science & Technology, 530 Physics, Geology, SUMMER MONSOON RAINFALL, AFRICA DOMAIN, LAND-SURFACE, PRECIPITATION CLIMATOLOGY, Earth sciences, RESOLUTION, EAST, GLOBAL PRECIPITATION, Physical Sciences, ddc:550, Geosciences, Multidisciplinary, NUMERICAL WEATHER PREDICTION, EUROPEAN CLIMATE
Abstract

In the last decade, the Climate Limited-area Modeling Community (CLM-Community) has contributed to the Coordinated Regional Climate Downscaling Experiment (CORDEX) with an extensive set of regional climate simulations. Using several versions of the COSMO-CLM-Community model, ERA-Interim reanalysis and eight global climate models from phase 5 of the Coupled Model Intercomparison Project (CMIP5) were dynamically downscaled with horizontal grid spacings of 0.44g (g1/4g50gkm), 0.22g (g1/4g25gkm), and 0.11g (g1/4g12gkm) over the CORDEX domains Europe, South Asia, East Asia, Australasia, and Africa. This major effort resulted in 80 regional climate simulations publicly available through the Earth System Grid Federation (ESGF) web portals for use in impact studies and climate scenario assessments. Here we review the production of these simulations and assess their results in terms of mean near-surface temperature and precipitation to aid the future design of the COSMO-CLM model simulations. It is found that a domain-specific parameter tuning is beneficial, while increasing horizontal model resolution (from 50 to 25 or 12gkm grid spacing) alone does not always improve the performance of the simulation. Moreover, the COSMO-CLM performance depends on the driving data. This is generally more important than the dependence on horizontal resolution, model version, and configuration. Our results emphasize the importance of performing regional climate projections in a coordinated way, where guidance from both the global (GCM) and regional (RCM) climate modeling communities is needed to increase the reliability of the GCM-RCM modeling chain., Geoscientific Model Development, 14 (8), ISSN:1991-9603, ISSN:1991-959X

Published
2021

49. Global exposure of population and land‐use to meteorological droughts under different warming levels and SSPs: A CORDEX‐based study

Author

Spinoni, Jonathan, primary, Barbosa, Paulo, additional, Bucchignani, Edoardo, additional, Cassano, John, additional, Cavazos, Tereza, additional, Cescatti, Alessandro, additional, Christensen, Jens H., additional, Christensen, Ole B., additional, Coppola, Erika, additional, Evans, Jason P., additional, Forzieri, Giovanni, additional, Geyer, Beate, additional, Giorgi, Filippo, additional, Jacob, Daniela, additional, Katzfey, Jack, additional, Koenigk, Torben, additional, Laprise, René, additional, Lennard, Christopher J., additional, Kurnaz, M. Levent, additional, Li, Delei, additional, Llopart, Marta, additional, McCormick, Niall, additional, Naumann, Gustavo, additional, Nikulin, Grigory, additional, Ozturk, Tugba, additional, Panitz, Hans‐Jürgen, additional, da Rocha, Rosmeri Porfirio, additional, Solman, Silvina A., additional, Syktus, Jozef, additional, Tangang, Fredolin, additional, Teichmann, Claas, additional, Vautard, Robert, additional, Vogt, Jürgen V., additional, Winger, Katja, additional, Zittis, George, additional, and Dosio, Alessandro, additional

Published
2021
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