|
|
|
|
|
| Camara, Ibrahima; Mignot, Juliette; Kolodziejczyk, Nicolas; Losada, Teresa; Lazar, Alban. |
| This study investigates the physical processes controlling the mixed layer buoyancy using a regional configuration of an ocean general circulation model. Processes are quantified by using a linearized equation of state, a mixed-layer heat, and a salt budget. Model results correctly reproduce the observed seasonal near-surface density tendencies. The results indicate that the heat flux is located poleward of 10° of latitude, which is at least three times greater than the freshwater flux that mainly controls mixed layer buoyancy. During boreal spring-summer of each hemisphere, the freshwater flux partly compensates the heat flux in terms of buoyancy loss while, during the fall-winter, they act together. Under the seasonal march of the Inter-tropical... |
| Tipo: Text |
Palavras-chave: Physical processes; Salt and heat budget; Density; Compensation. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00634/74636/74530.pdf |
| |
|
|
| Rodriguez-fonseca, Belen; Mohino, Elsa; Mechoso, Carlos R.; Caminade, Cyril; Biasutti, Michela; Gaetani, Marco; Garcia-serrano, J.; Vizy, Edward K.; Cook, Kerry; Xue, Yongkang; Polo, Irene; Losada, Teresa; Druyan, Leonard; Fontaine, Bernard; Bader, Juergen; Doblas-reyes, Francisco J.; Goddard, Lisa; Janicot, Serge; Arribas, Alberto; Lau, William; Colman, Andrew; Vellinga, M.; Rowell, David P.; Kucharski, Fred; Voldoire, Aurore. |
| The Sahel experienced a severe drought during the 1970s and 1980s after wet periods in the 1950s and 1960s. Although rainfall partially recovered since the 1990s, the drought had devastating impacts on society. Most studies agree that this dry period resulted primarily from remote effects of sea surface temperature (SST) anomalies amplified by local land surface-atmosphere interactions. This paper reviews advances made during the last decade to better understand the impact of global SST variability on West African rainfall at interannual to decadal time scales. At interannual time scales, a warming of the equatorial Atlantic and Pacific/Indian Oceans results in rainfall reduction over the Sahel, and positive SST anomalies over the Mediterranean Sea tend to... |
| Tipo: Text |
|
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00624/73564/73013.pdf |
| |
|
|
|
