Contrasting sensitivity of lake sediment n-alkanoic acids and n-alkanes to basin-scale vegetation and regional-scale precipitation δ2H in the Adirondack Mountains, NY (USA)

Freimuth, Erika J.; Diefendorf, Aaron F.; Lowell, Thomas V.; Bates, Benjamin R.; Schartman, Anna; Bird, Broxton W.; Landis, Joshua D.; Stewart, Alexander K.

doi:10.1016/j.gca.2019.08.026

Cited by 27 publications

(3 citation statements)

References 90 publications

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“…Detailed processed-based studies at the catchment scale (Freimuth et al, 2019(Freimuth et al, , 2020Dion-Kirschner et al, 2020) may be more useful for constraining sedimentary δ 2 HWax than additional large-scale calibration efforts.…”

Section: Accepted Articlementioning

confidence: 99%

Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific

Ladd

Maloney

Nelson

et al. 2020

Preprint

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Leaf wax 2 H/ 1 H ratios are correlated with mean annual precipitation 2 H/ 1 H ratios globally, but not in the tropical Pacific• Deviations from the global relationship between precipitation leaf wax 2 H/ 1 H ratios cannot be predicted from palynological assemblages• Small range and large uncertainties in estimates of tropical Pacific precipitation 2 H/ 1 H ratios likely account for poor correlations

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Section: Accepted Articlementioning

confidence: 99%

Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific

Ladd

Maloney

Nelson

et al. 2020

Preprint

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“…In practice, at a single site where many variables that contribute to scatter among sites are constant, the threshold for detecting changes in δ 2 H P values may be significantly smaller. Detailed processed-based studies at the catchment scale (Dion-Kirschner et al, 2020;Freimuth et al, 2020Freimuth et al, , 2019) may be more useful for constraining sedimentary δ 2 H Wax than additional large-scale calibration efforts.…”

Section: Implications For Paleoclimate Reconstructions In the Tropical Pacificmentioning

confidence: 99%

Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific

et al. 2021

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Hydrogen isotope ratios of sedimentary leaf waxes (δ 2 H Wax values) are increasingly used to reconstruct past hydroclimate. Here, we add δ 2 H Wax values from 19 lakes and four swamps on 15 tropical Pacific islands to an updated global compilation of published data from surface sediments and soils. Globally, there is a strong positive linear correlation between δ 2 H values of mean annual precipitation (δ 2 H P values) and the leaf waxes n-C 29-alkane (R 2 = 0.74, n = 665) and n-C 28-acid (R 2 = 0.74, n = 242). Tropical Pacific δ 2 H Wax values fall within the predicted range of values based on the global calibration, and the largest residuals from the global regression line are no greater than those observed elsewhere, despite large uncertainties in δ 2 H P values at some Pacific sites. However, tropical Pacific δ 2 H Wax values in isolation are not correlated with estimated δ 2 H P values from isoscapes or from isotope-enabled general circulation models. Palynological analyses from these same Pacific sediment samples suggest no systematic relationship between any particular type of pollen distribution and deviations from the global calibration line. Rather, the poor correlations observed in the tropical Pacific are likely a function of the small range of δ 2 H P values relative to the typical residuals around the global calibration line. Our results suggest that δ 2 H Wax values are currently most suitable for use in detecting large changes in precipitation in the tropical Pacific and elsewhere, but that ample room for improving this threshold exits in both improved understanding of δ 2 H variability in plants, as well as in precipitation. Plain Language Summary Past precipitation patterns are difficult to reconstruct, limiting our ability to understand Earth's climate system. Geochemists reconstruct past precipitation by measuring the amount of heavy hydrogen naturally incorporated into the waxy coating of leaves, which is preserved in mud that accumulates in lakes, soils, and oceans. Heavy hydrogen in leaf waxes is strongly correlated with local precipitation, allowing us to learn about rainfall intensity, temperature, and cloud movement. However, no existing calibration studies include sites from the tropical Pacific, home to the most intense rainfall on the planet and populations that rely on rain for drinking water and farming. We measured heavy hydrogen in leaf waxes from tropical Pacific islands and show that although values are within the global calibration error, no precipitation relationship exists within the region. Plant type distributions do not explain the lack of correlation, which is best attributed to poorly constrained estimates of heavy hydrogen in local rain and the relatively small range of variability within the region. At present, heavy hydrogen from ancient leaf waxes can show large changes in past precipitation, but improved processlevel understanding is needed to use this tool to understand smaller changes in the tropical Pacific and elsewhere. LADD ET AL.

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“…For example, biomarkers are molecules compounds derived from biological sources that can retain certain information such as origin, past depositional environment and climate in geological formations. Biomarker studies of non-emergent vascular plants consist of C 21 , C 23 and C 25 n-alkanes, whereas vascular terrestrial plants consist of C 27 , C 29 and C 31 n-alkanes (Meyers and Ishiwatari, 1993;Beilman et al, 2020;Freimuth et al, 2020). Ratnayake et al (2019) examined the biomarker distribution of n-alkanes in several terrestrial ecosystems (Figure 6).…”

Section: Definition and Classificationmentioning

confidence: 99%

Characteristics of Lowland Tropical Peatlands: Formation, Classification, and Decomposition

Ratnayake

2020

JTFE

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Tropical peatlands occur mostly in coastal lowlands, and it can be considered as larger sinkers of carbon and important ecosystem services for water resources, bio-resources and biodiversity. This article summarised characteristics, formation and classification of tropical lowland peatlands. Tropical peatlands cover about 11% of the global peatland resource (441,025 km2 in area) and the estimation value can be changed with including all histosols and shallow organic soils. Tropical coastal peatlands were predominantly developed during the middle to late Holocene (between 3,500 to 6,000 years BP) under the wet conditions generated after the stabilisation and regression of middle Holocene sea-level highstands. Hydrology is a fundamental factor to the formation and function of tropical peatlands. There is no specific definition for the peatlands based on available references. The available definitions can be broadly divided into authoritative and scientific definitions. The authoritative definitions depend on specific uses and applications, while scientific definitions depend on field observations and experimental design/analytical methods. Tropical peatlands store abundant organic matter. However, the recent anthropogenic activities enhance the emission of stored carbon as greenhouse gasses such as CH4 and CO2.

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Contrasting sensitivity of lake sediment n-alkanoic acids and n-alkanes to basin-scale vegetation and regional-scale precipitation δ2H in the Adirondack Mountains, NY (USA)

Abstract: Contrasting sensitivity of lake sediment n-alkanoic acids and n-alkanes to basin-scale vegetation and regional-scale precipitation δ2H in the Adirondack Mountains, NY (USA). Geochimica et Cosmochimica Acta, 268, pp. 22-41.

Cited by 27 publications

References 90 publications

Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific

Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific

Leaf Wax Hydrogen Isotopes as a Hydroclimate Proxy in the Tropical Pacific

Characteristics of Lowland Tropical Peatlands: Formation, Classification, and Decomposition

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