Multi-proxy records of Holocene fluvio-lacustrine sediments in the southern Liaodong Peninsula, China

Abstract

The Liaodong Peninsula is located in the present Asian summer monsoon (ASM) area and has frequent land-sea interactions that make it sensitive to climate change. Terrestrial sediments can continuously record climate change with high resolution. The range and time of the East Asian summer monsoon (EASM), the main Holocene climate change driver, can be better explained by the change in the sedimentary environment in the region. This paper presents the chronology, sedimentology and geochemistry of the Holocene fluvio-lacustrine sediments in the Paozi basin south of Liaodong Peninsula, China. The multi-agent records show that the temperature and humidity are slightly higher from before 5.2ka.cal.BP to warm / wet stage, and the relative transition time from the warmest / wet stage to cold / dry stage is from 5.2ka.cal.BP to 3.5ka.cal.BP. Then, the regional climate shifted to relatively drier and colder conditions after 3.5 ka.cal.BP. Compared with other records near our site, the climate and variations in the water level change of this palaeolake were controlled by the change in the Holocene EASM precipitation, and the insolation-driven temperature co-determined the dynamics. Furthermore, the formation and disappearance of the palaeolake was due to the strengthening and decline in the EASM, respectively.

Reconstructing the Climate Variability During the Last 5000 Years From the Banni Plains, Kachchh, Western India

“…The concentration of various oxides and elements is often derivative of weathering processes acting in the catchment of the basins. Major elemental concentration in sediments, mineral magnetics, and grain size often reflects the source of the origin, which were being used as effective proxies to demonstrate the intensity of chemical weathering, climate changes, and precipitation variations in the region (Staubwasser and Sirocko 2002;Yancheva et al, 2007;Tyagi et al, 2012;Clift et al, 2014;Das et al, 2017;Pillai et al, 2018;Ruifeng et al, 2020). The ratios like Na 2 O/TiO 2 , CaO/TiO 2 , and Fe 2 O 3 /TiO 2 can be used to infer the changes in the paleoenvironmental condition (Pillai et al, 2018;Makwana et al, 2019 (Muhs et al, 2001;Kotlia and Joshi, 2013;Minyuk et al, 2013;Pillai et al, 2018 (Buggle et al, 2011;Pillai et al, 2018;Makwana et al, 2019).…”