Abstract. Past climatic change can be reconstructed from sedimentary archives by a number of proxies. However, few methods exist to directly estimate hydrological changes and even fewer result in quantitative data, impeding our understanding the timing, magnitude mechanisms changes. Here we present novel approach based on δ2H values lipid biomarkers combination with plant physiological modeling extract information past relative humidity. Our initial application an annually laminated...

The microbiota is attributed to be important for initial soil formation under extreme climate conditions, but experimental evidence its relevance scarce. To fill this gap, we investigated the impact of in situ microbial communities and their interrelationship with biocrust plants compared abiotic controls on arid semiarid soils. Additionally, assessed response bacterial change. Topsoil subsoil samples from sites Chilean Coastal Cordillera were incubated 16 weeks diurnal temperature moisture...

Effective recovery and high purity of lipid biomarkers are essential for compound-specific stable isotope analysis in a variety fields ranging from hydrocarbon research, paleoclimatology, food drug medicine. Solid-phase extraction (SPE) is the most common method purifying organic compounds complex mixtures. SPE constitutes labor-intensive part laboratory work often limiting number samples that can be analyzed. Reliable, easy-to-use, automated methods could increase sample throughput as well...

Cliff failure is a fundamental process shaping many coastlines worldwide. Improved insight into direct links between cliff and forcing mechanisms requires precise information on the timing of individual failures, which difficult to obtain with conventional observation methods for longer stretches coastline. Here we use seismic records auxiliary data spanning 25 months precisely identify locate 81 events along 8.6‐km‐long chalk coast Jasmund, Germany's largest island, Rügen. The subminute...

Abstract. Landscapes in high northern latitudes are assumed to be highly sensitive future global change, but the rates and long-term trajectories of changes rather uncertain. In boreal zone, fires an important factor climate–vegetation interactions biogeochemical cycles. Fire regimes characterized by small, frequent, low-intensity within summergreen forests dominated larch, whereas evergreen spruce pine burn large areas less frequently at higher intensities. Here, we explore potential...

ABSTRACT Lake Meerfelder Maar (MFM) is the northernmost Western European sediment record with annual laminations across Younger Dryas (YD), and onset of YD in MFM has previously been defined as an increase non‐arboreal pollen abundance at ca. 12 680 varve a BP. Here we present palynological unprecedented subdecadal resolution for MFM, covering Allerød–YD transition. Our results show fluctuation accumulation rates (PARs) before YD, lower between 725 685 The PARs occurs simultaneous...

The Kamchatka Peninsula (Russian Far East) remains among the least studied regions of eastern Asia. Recent studies revealed a high degree palaeoenvironmental variability between different parts peninsula. We investigated semi‐aquatic (chironomids) and terrestrial (leaf wax biomarkers) proxies from sediment core collected Lake Sokoch (southern Kamchatka) to provide reconstruction mean July air temperature variations in limnic conditions. lake formed after 10.0 cal. ka BP as result postglacial...

Abstract. Past climatic change can be reconstructed from sedimentary archives by a number of proxies. However, few methods exist to directly estimate hydrological changes and even fewer result in quantitative data, impeding our understanding the timing, magnitude mechanisms changes. Here we present novel approach based on δ2H values lipid biomarkers combination with plant physiological modeling, extract information past relative humidity. Our initial application an annually laminated...

Abstract. The hydrogen isotope composition of leaf wax biomarkers (δ2Hwax) is a valuable tool for reconstructing continental paleohydrology, since it serves as proxy the precipitation (δ2Hpre). To yield robust palaeohydrological reconstructions using δ2Hwax in marine archives, necessary to examine impacts regional climate on and assess similarity between sedimentary source δ2Hwax. Here, we examined an aridity gradient from hyperarid humid along Chilean coast. We sampled sediments at outlets...

Cliff failure is a fundamental process shaping many coastlines worldwide. Improved insight into direct links between cliff and forcing mechanisms requires precise information on the timing of individual failures, which difficult to obtain with conventional observation methods for longer stretches coastline. Here we use seismic records auxiliary data spanning 25 months precisely identify locate 81 events along 8.6-km long chalk coast Jasmund, Germany’s largest island, Rügen. The sub-minute...

Abstract. The hydrogen isotope composition of leaf wax biomarkers (δ2Hwax) is a valuable tool for reconstructing continental paleohydrology, as it serves proxy the precipitation (δ2Hpre). To yield robust palaeohydrological reconstructions using δ2Hwax in marine archives, necessary to examine impacts regional climate on and assess similarity between sedimentary source δ2Hwax. Here, we examined an aridity gradient from hyperarid humid along Chilean coast. We sampled sediments at outlets rivers...

Understanding the long-term impact of projected climate change on tropical rainforests is critical given their central role in Earth's system. Palaeoecological records can provide a valuable perspective this problem. Here, we examine effects past climatic changes dominant forest type Southeast Asia - lowland dipterocarp forest. We use range proxies extracted from 1400-yr-old lacustrine sedimentary sequence north-eastern Philippines to determine vegetation responses forest, including its tree...

Temperature records with a high temporal resolution and spanning the last millennium are of primordial importance to understand climate variability beyond instrumental period at multi-decadal multi-centennial timescales. However, such rare absolute values often suffer from large uncertainties. While tree-ring provide excellent temperature in mid-latitudes an annual timescale, they generally not well-suited for understanding centennial multi-millennial due biologic age trends. Here, we...

Abstract. Fluvial transport of organic carbon from the terrestrial biosphere to oceans is an important term in global cycle. Traditionally, long-term burial flux fluvial particulate (POC) estimated using river suspended sediment flux; however, can also travel bedload as coarse matter (POMBed). Estimates POC export ocean are highly uncertain because few studies document POMbed sources, flux, and evolution during long-range uplands basins. This knowledge gap limits our ability determine flux....

Abstract A multiproxy study of a sediment sequence from Québec peatbog characterises the rapid and significant environmental responses to changing climatic conditions deglaciation Laurentide Ice Sheet early Holocene period. Scotstown Bog (45°30'45.0“N, 71°11'42.0“W) is an ombrotrophic peatland on edge Appalachian Uplands in southern Québec, Canada. We reconstructed its Late‐glacial palaeoenvironments for 14 000–6 000 cal bp using palaeobotanical (plant macrofossil, macrocharcoal, pollen...

Apart from natural variations in environmental and climatic conditions, human activities (e.g. land-use changes) can have major impacts on freshwater ecosystems. In the context of New Zealand, arrival humans approximately 750 years ago has left a permanent mark landscapes, posing challenges discerning undisturbed conditions for paleoclimatic reconstructions. Yet, remote alpine lakes Southwest Pacific serve as pristine archives climate changes, hardly influenced by activities. This study...

Abstract. Fluvial transport of organic carbon from the terrestrial biosphere to oceans is an important term in global cycle. Traditionally, long-term burial flux fluvial particulate (POC) estimated using river suspended sediment flux; however, can also travel bedload as coarse matter (POMBed). Estimates POC export ocean are highly uncertain because few studies document POMbed sources, and evolution during long-range uplands basins. This knowledge gap limits our ability determine flux. In...

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