Interdecadal Changes in Ocean Teleconnections with the Sahel
Implications in Rainfall Predictability
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Beschreibung
In tropical latitudes, monsoons trigger regimes of strong seasonal rainfall over the continents. Over the West African region, the rainfall has shown a strong variability from interannual to decadal time scales. The atmospheric response to global sea surface temperatures is the leading cause of rainfall variability in the West African Sahel. This thesis explores changes in the leading ocean forcing of Sahelian rainfall interannual variability. It analyzes the dynamical mechanisms at work to explain the non-stationary sea surface temperature-forced response of anomalous rainfall. The underlying multidecadal sea surface temperature background is raised as a key factor that favors some interannual teleconnections and inhibits others. Results of this thesis are relevant for improving the seasonal predictability of summer rainfall in the Sahel.
In tropical latitudes, monsoons trigger regimes of strong seasonal rainfall over the continents. Over the West African region, the rainfall has shown a strong variability from interannual to decadal time scales. The atmospheric response to global sea surface temperatures is the leading cause of rainfall variability in the West African Sahel. This thesis explores changes in the leading ocean forcing of Sahelian rainfall interannual variability. It anaylzes the dynamical mechanisms at work to explain the non-stationary sea surface temperature-forced response of anomalous rainfall. The underlying multidecadal sea surface temperature background is raised as a key factor that favors some interannual teleconnections and inhibits others. Results of this thesis are relevant for improving the seasonal predictability of summer rainfall in the Sahel.
Nominated as an outstanding PhD thesis by the University Complutense of Madrid, Madrid, Spain Demonstrates for the first time the unstable behavior of the sea surface temperature-forced response of monsoonal rainfall in the Sahel Provides key findings in the field of atmospheric teleconnections Bases its results on observational data, in-situ rainfall measurements and reanalysis data combining both statistical methods and atmospheric general circulation models
Autor*in
Roberto Suárez Moreno
Themen in »Interdecadal Changes in Ocean Teleconnections with the Sahel«
West African Monsoon Sahelian rainfall climate variability interannual variability multidecadal variability atmospheric teleconnection SST-forced teleconnection non-stationary teleconnection climate change impacts