Three North African dust source areas and their geochemical fingerprint
نویسندگان
چکیده
North Africa produces more than half of the world's atmospheric dust load. Once entrained into atmosphere, this poses a human health hazard locally. It also modifies radiative budget regionally, and supplies nutrients that fuel primary productivity across Atlantic Ocean as far afield Amazonian Basin. Dust accumulation in deep sea lacustrine sediments provides means to study changes palaeoclimate, particularly those associated with rainfall climate change. Systematic analysis satellite imagery has greatly improved our understanding trajectories long-range African plumes, but knowledge dust-producing source regions ability fingerprint their contribution these export routes is surprisingly limited. Here we report new radiogenic isotope (Sr Nd) data for sediment samples from known substrates (dried river lake beds), integrate them published weight activation. We define three isotopically distinct preferential areas (PSAs): Western, Central an Eastern PSA. More are needed, Western PSA, results show change PSA composition Nd- less Sr-isotope values west east, line overall decreasing age underlying bedrock. Our reveal extreme isotopic heterogeneity within Chadian region including extremely distinctive geochemical feeding Bodélé Depression, most active on Earth. significantly improves reliability by which windblown deposits can be geochemically fingerprinted distant regions.
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2021
ISSN: ['1385-013X', '0012-821X']
DOI: https://doi.org/10.1016/j.epsl.2020.116645