Reconstruction Paleoclimate Dased on Sporopollen Record of Re'nacuo Lake, Tibet

Abstract

The sedimentary sequences since 33 ka B.P. to 10 ka B.P. have been established in the Re'nacuo‐Lake, Gaize area of north Tibet, through a study of a lacustrine section. The climate since 33 ka B.P. to 10 ka B.P. may be divided into two cycle include 5 dry phases and 5 moist phases from reconstructing the paleoclimate through a study of sporopollen analysis. It mainly reflects the general regularity of global climatic change through contrasting with the pale environment in northern hemisphere. Our pollen record reveals a regional climate history similar to those from the neighboring sites, including the GISP2, the Guliya ice core and core RM in Zoige, and thus supports the notion that the Qinghai‐Tibetan Plateau acts as an important link between climatic events in the North Atlantic realm and the Asian monsoon domain. The response of the Qinghai‐Tibet Plateau to the global climatic change is relatively sensitive.

Early Cretaceous (Aptian to Albian) vegetation and climate change in Central Africa: Novel palynological evidence from the Doseo Basin

“…Bryophytes Aequitriradites Humid (Abbink et al, 2001;Abbink et al, 2004;Deng, 2007;Duan, 1991;Gao et al, 1994;Li et al, 2016;Li et al, 2019;Lin, 2020;Slater et al, 2019;Stukins et al, 2013;Vakhrameev, 1981;Wang, 2010) Foraminisporis Humid -Souza et al, 2022;Steinig et al, 2020). In this study, the paly- with temperature.…”

“…Accordingly, the average content of gymnosperm pollen was 81.9% and 59.1% in the lower and upper parts of 2215–2220 m, respectively. The palynomorphs from boreholes K‐1 can indicate the humidity of climate, and among them are arid‐type Cheirolepidiaceae ( Classopollis ), Ephedrales ( Ephedripites , Jugella ) and humid‐type Bryophytes ( Aequitriradites , Foraminisporis , Interulobites , Polycingulatisporites ), Selaginellaceae ( Densoisporites , Foveosporites , Hsuisporites ), Lycopodiaceae ( Leptolepidites , Staplinisporites ), Filicopsida ( Apiculatisporis ), Osmundacidites ( Osmundacidites ), Dicksoniaceae ( Cibotiumspora , Impardecispora ), Schizaeaceae ( Cicatricosisporites , Klukisporites , Toroisporis ), Cyatheaceae ( Cyathidites ) and Dipteridaceae ( Dictyophyllidites ); KE‐101 can indicate the humidity of climate, and among them are arid‐type Cheirolepidiaceae ( Classopollis ), Ephedrales ( Jugella ) and humid‐type Bryophytes ( Foraminispori s), Osmundacidites ( Osmundacidites ), Schizaeaceae ( Cicatricosisporites ), Cyatheaceae ( Cyathidites ) and Dipteridaceae ( Dictyophyllidites ) (Table 4) (Abbink et al, 2001; Abbink et al, 2004; Duan, 1991; Gao, Deng, 2007; Li et al, 2016; Li et al, 2019; Lin, 2020; Slater et al, 2019; Stukins et al, 2013; Vakhrameev, 1981; Zhang et al, 2015; Gao et al, 1994) (Figure 12). It can be considered that around 2215–2220 m, the climate changed significantly, from relatively dry to relatively wet (Figures 10–12).…”

“…Although Araucariacites presence indicates relatively humid climate, the proportion of Araucariacites is much lower than that of Classopollis in the Doseo Basin. Therefore, the spore/gymnosperms ratio was used to infer trends in humidity in this study (Figures 10 and 11 4) (Abbink et al, 2001;Abbink et al, 2004;Duan, 1991;Gao, Deng, 2007;Li et al, 2016;Li et al, 2019;Lin, 2020;Slater et al, 2019;Stukins et al, 2013;Vakhrameev, 1981;Zhang et al, 2015;Gao et al, 1994) (Figure 12). It can be considered that around 2215-2220 m, the climate changed significantly, from relatively dry to relatively wet (Figures 10-12).…”