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Full-Text Articles in Oceanography and Atmospheric Sciences and Meteorology
Seasonal Variability And Predictability Of Monsoon Precipitation In Southern Africa, Matthew F. Horan, Fred Kucharski, Moetasim Ashfaq
Seasonal Variability And Predictability Of Monsoon Precipitation In Southern Africa, Matthew F. Horan, Fred Kucharski, Moetasim Ashfaq
Faculty Publications
Rainfed agriculture is the mainstay of economies across Southern Africa (SA), where most precipitation is received during the austral summer monsoon. This study aims to further our understanding of monsoon precipitation predictability over SA. We use three natural climate forcings, El Niño–Southern Oscillation, Indian Ocean Dipole (IOD), and the Indian Ocean Precipitation Dipole (IOPD)—the dominant precipitation variability mode—to construct an empirical model that exhibits significant skill over SA during monsoon in explaining precipitation variability and in forecasting it with a five-month lead. While most explained precipitation variance (50%–75%) comes from contemporaneous IOD and IOPD, preconditioning all three forcings is key …
Precipitation Rates And Atmospheric Heat Transport During The Cenomanian Greenhouse Warming In North America: Estimates From A Stable Isotope Mass-Balance Model, David F. Ufnar, Greg A. Ludvigson, Luis González, Darren R. Gröcke
Precipitation Rates And Atmospheric Heat Transport During The Cenomanian Greenhouse Warming In North America: Estimates From A Stable Isotope Mass-Balance Model, David F. Ufnar, Greg A. Ludvigson, Luis González, Darren R. Gröcke
Faculty Publications
Stable isotope mass-balance modeling results of meteoric δ18O values from the Cenomanian Stage of the Cretaceous Western Interior Basin (KWIB) suggest that precipitation and evaporation fluxes were greater than that of the present and significantly different from simulations of Albian KWIB paleohydrology. Sphaerosiderite meteoric δ18O values have been compiled from the Lower Tuscaloosa Formation of southwestern Mississippi (25°N paleolatitude), The Dakota Formation Rose Creek Pit, Fairbury Nebraska (35°N) and the Dunvegan Formation of eastern British Columbia (55°N paleolatitude). These paleosol siderite δ18O values define a paleolatitudinal gradient ranging from − 4.2‰ VPDB at 25°N …