Quantitative paleotemperature reconstruction is a challenging and important issue in paleoenvironmental studies, for which carbonate clumped isotope (Δ47) thermometry promising approach. Here we analyzed Δ47 values from 66 layers of OT02 stalagmite Ohtaki Cave central Japan, covering two separate time intervals (2.6–8.8 34.8–63.5 ka) to reconstruct terrestrial temperature meteoric δ18O records....

With the development of carbonate clumped isotope (?47) geothermometer, many ?47–temperature calibrations based on biogenic and abiogenic carbonates have been generated in recent years. However, there is still not a robust empirical calibration relationship derived from lacustrine authigenic that can be used to calculate lake water temperatures ?47 values. In this study, we present new dataset ...

Isoprenoidal glycerol dialkyl tetraether (isoGDGT) lipids occur ubiquitously in freshwater and marine environments. Since their distribution varies with temperature, sedimentary isoGDGTs have been used as proxies for the reconstruction of past continental climate almost two decades. Yet, application lacustrine sediments is still not well constrained because niches isoGDGT-producing microorganis...

A 4-year time-series of surface seawater Sr/Ca ratios was assembled across a section the Florida Keys Reef Tract, in order to uncover any variability that might explain previously reported anomalies regional calibrations coral aragonite paleotemperature proxy. Samples were collected semiannually on grid 54 sites, from September 2016 until January 2020. The 325-km2 extended ocean shore forereef ...

This study aimed to identify the nature of variable groundwater salinity from standpoint whether natural or man-caused factors have a dominant impact on modern range Lower Jurassic sediments in Talinskoye oilfield West Siberia Russia. As now, values reservoir waters vary 3.7 15.3 g/dm3, with an average 8.9 g/dm3. Petroleum hydrocarbons are extracted at sediments. The volume overlying sediments’...

Abstract We use theNorthern Hemisphere Tree-RingNetwork Development (NTREND) tree-ring database to examine the effects of using a small, highly-sensitive proxy network for paleotemperature data assimilation over last millennium. first evaluate our methods pseudo-proxy experiments. These indicate that spatial assimilations this are skillful in extratropical Northern and improve on previous NTREN...

Reconstructions of ancient ocean chemistry are largely based on geochemical proxies obtained from epicontinental seas. Mounting evidence suggests that these shallow inland seas were chemically distinct the nearby open ocean, decoupling records broader conditions. Here we use isotope-enabled Community Earth System Model to evaluate extent which oxygen isotopic composition late Carboniferous sea,...

The Earth has gone through multiple ice ages in the past million years. Understanding age dynamics is crucial to paleoclimatic study, and helpful for addressing future climate challenges. Though are paced by variations Earth’s orbit geometry, how various climatic system components on respond insolation forcing interact with each other remains unclear. A prevailing view argues that initial respo...

Global mean sea level is a key component within the fields of climate and oceanographic modelling in Anthropocene. Hence, an improved understanding eustatic deep time aids our Earth’s paleoclimate may help predict future climatological changes. However, long-term reconstructions are hampered because ambiguity stratigraphic interpretations rock record limitations plate tectonic modelling. Hence ...