Hydroclimate variability in the Madagascar and Southeast African summer monsoons at the Mid- to Late-Holocene transition
نویسندگان
چکیده
The 4.2 ka event at the Mid- to Late-Holocene transition is often regarded as one of largest and best documented abrupt climate disturbances Holocene. most clearly manifested in Mediterranean Middle East a regional dry anomaly beginning abruptly 4.26 kyr BP extending until 3.97 BP. Yet impacts this drought are extended other regions sometimes globally. In particular, nature spatial extent tropics have not been established. Here, we present new stalagmite stable isotope record from Anjohikely, northwest Madagascar. Growing between 5.22 2.00 BP, AK1 shows hiatus 4.31 3.93 (±40 ± 35 yrs), replicating another nearby Anjohibe, therefore indicating significant drying transition. This result opposite wet conditions 8.2 event, suggesting fundamentally different forcing mechanisms. Dry also recorded sediment cores Lake Malawi, Masoko Tatos Basin on Mauritius, southeast African monsoon domain. However, no notable northern (equatorial Africa) eastern (Rodrigues) peripheries domain, while Muzi Mkhuze Delta south. pattern largely consistent with modern rainfall associated weak Mozambique Channel Trough northerly austral summer Intertropical Convergence Zone position. Within age error, observed peak anomalies overlap event. However hydrological change consistently begins earlier than onset. Gradual frequently around 4.5 raising doubt whether any coherent merely coincident or part global climatic anomaly.
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ژورنال
عنوان ژورنال: Quaternary Science Reviews
سال: 2023
ISSN: ['1873-457X', '0277-3791']
DOI: https://doi.org/10.1016/j.quascirev.2022.107874