Stable isotope composition of precipitation over southeast Asia

Araguás‐Araguás, Luis; Froêhlich, K.; Różański, Kazimierz

doi:10.1029/98jd02582

Cited by 761 publications

(628 citation statements)

References 28 publications

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“…Summer monsoon rains in Thailand are typically 4 lighter than in winter, despite the higher summer temperatures [8]. This amount effect is commonly observed for regions heavily influenced by monsoon activity (typically south of the maximum northward extent of the Intertropical Convergence Zone (ITCZ) ( Figure 1 in [8]) whereas the reverse is true for northern regions where temperature effects dominate and yield heavy (light) δ 18 O rainfall values in summer (winter) [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…This amount effect is commonly observed for regions heavily influenced by monsoon activity (typically south of the maximum northward extent of the Intertropical Convergence Zone (ITCZ) ( Figure 1 in [8]) whereas the reverse is true for northern regions where temperature effects dominate and yield heavy (light) δ 18 O rainfall values in summer (winter) [9][10][11]. In addition, δ 18 O of precipitation varies with altitude (depletion in heavy isotopes with increased elevation) and with the distance travelled over land relative to the source region (preferential condensation of heavy isotopes).…”

Section: Introductionmentioning

confidence: 99%

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Seasonally resolved stable isotope chronologies from northern Thailand deciduous trees

Poussart

Schrag

2005

Earth and Planetary Science Letters

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Despite the existence of a number of climate proxies, the terrestrial expression of tropical climate variability over the past few centuries remains poorly resolved. We explore the applicability of stable isotope dendroclimatology as a tool for chronology and paleo-hydrology reconstruction on deciduous trees from monsoonal northern Thailand. Analysis of 11 trees coming from 4 different regions of northern Thailand yielded 7 records with varying degrees of δ 18 O and δ 13 C seasonality. We develop age models for trees lacking visible rings based on the seasonality of the δ 18 O and find agreement to within ≤ 3 years with radiocarbon age estimates. We use the isotopic age models to reconstruct estimates of growth rates and find a significant Word Count ∼ 4500, Page Count ∼

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seasonally resolved stable isotope chronologies from northern Thailand deciduous trees

Poussart

Schrag

2005

Earth and Planetary Science Letters

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“…To our knowledge, this is the first paper to compare tree-ring cellulose δ 18 O directly with tree-ring Δ 14 C. Tree-ring δ 18 O is correlated negatively with relative humidity and positively with δ 18 O in precipitation (31). Because δ 18 O in precipitation is negatively correlated with the amount of precipitation in monsoon areas (32), the tree-ring δ 18 O can be a reliable proxy for past relative humidity and/or amount of precipitation in Japan (33)(34)(35). In humid and temperate regions, variations in tree-ring width and its carbon isotopic composition (δ 13 C) often show large discre-pancies between different individual trees mainly due to ecological competition in forest areas of high population density.…”

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confidence: 99%

Synchronized Northern Hemisphere climate change and solar magnetic cycles during the Maunder Minimum

Yamaguchi

Yokoyama

Miyahara

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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The Maunder Minimum (A.D. 1645Minimum (A.D. -1715) is a useful period to investigate possible sun-climate linkages as sunspots became exceedingly rare and the characteristics of solar cycles were different from those of today. Here, we report annual variations in the oxygen isotopic composition (δ 18 O) of tree-ring cellulose in central Japan during the Maunder Minimum. We were able to explore possible sun-climate connections through high-temporal resolution solar activity (radiocarbon contents; Δ 14 C) and climate (δ 18 O) isotope records derived from annual tree rings. The tree-ring δ 18 O record in Japan shows distinct negative δ 18 O spikes (wetter rainy seasons) coinciding with rapid cooling in Greenland and with decreases in Northern Hemisphere mean temperature at around minima of decadal solar cycles. We have determined that the climate signals in all three records strongly correlate with changes in the polarity of solar dipole magnetic field, suggesting a causal link to galactic cosmic rays (GCRs). These findings are further supported by a comparison between the interannual patterns of tree-ring δ 18 O record and the GCR flux reconstructed by an ice-core 10 Be record. Therefore, the variation of GCR flux associated with the multidecadal cycles of solar magnetic field seem to be causally related to the significant and widespread climate changes at least during the Maunder Minimum. solar forcing of climate | little ice age | paleoclimate reconstruction | grand solar minimum | tree-ring isotope climatology

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“…In eastern Africa, δD rain values correlate inversely with precipitation amounts due to the influences of vapor-source, transport history, and "amount" effects (17). Today the Indian Ocean is the primary vapor source to eastern Africa (13); the Atlantic Ocean and continental surfacewater evaporation are important secondary sources.…”

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confidence: 99%

“…The response of algal « lipid/water values to salinity is markedly consistent at 0.9‰ ± 0.2‰ ppt −1 (7). Heptacosane (nC 17 ) is a general biomarker for algae (36) and is abundant in lake sediments from Olduvai Gorge. Modern studies establish an apparent fractionation between freshwater and nC 17 equal to −172‰ (7), and we use this value to determine algal « lipid/water values at different salinities-termed « lake values:…”

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confidence: 99%

Water, plants, and early human habitats in eastern Africa

Magill

Ashley

Freeman

2012

Proc. Natl. Acad. Sci. U.S.A.

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Water and its influence on plants likely exerted strong adaptive pressures in human evolution. Understanding relationships among water, plants, and early humans is limited both by incomplete terrestrial records of environmental change and by indirect proxy data for water availability. Here we present a continuous record of stable hydrogen-isotope compositions (expressed as δD values) for lipid biomarkers preserved in lake sediments from an early Pleistocene archaeological site in eastern Africa-Olduvai Gorge. We convert sedimentary leaf-and algal-lipid δD values into estimates for ancient source-water δD values by accounting for biochemical, physiological, and environmental influences on isotopic fractionation via published water-lipid enrichment factors for living plants, algae, and recent sediments. Reconstructed precipitation and lakewater δD values, respectively, are consistent with modern isotopic hydrology and reveal that dramatic fluctuations in water availability accompanied ecosystem changes. Drier conditions, indicated by less negative δD values, occur in association with stable carbon-isotopic evidence for open, C 4 -dominated grassland ecosystems. Wetter conditions, indicated by lower δD values, are associated with expanded woody cover across the ancient landscape. Estimates for ancient precipitation amounts, based on reconstructed precipitation δD values, range between approximately 250 and 700 mm·y −1 and are consistent with modern precipitation data for eastern Africa. We conclude that freshwater availability exerted a substantial influence on eastern African ecosystems and, by extension, was central to early human proliferation during periods of rapid climate change.paleohydrology | plant waxes | carbon isotopes

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Stable isotope composition of precipitation over southeast Asia

Cited by 761 publications

References 28 publications

Seasonally resolved stable isotope chronologies from northern Thailand deciduous trees

Seasonally resolved stable isotope chronologies from northern Thailand deciduous trees

Synchronized Northern Hemisphere climate change and solar magnetic cycles during the Maunder Minimum

Water, plants, and early human habitats in eastern Africa

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