Plant biomarkers in aerosols record isotopic discrimination of terrestrial photosynthesis

Carbon uptake by the oceans and by the terrestrial biosphere can be partitioned using changes in the 12C/13C isotopic ratio (δ13C) of atmospheric carbon dioxide, because terrestrial photosynthesis strongly discriminates against 13CO2, whereas ocean uptake does not. This approach depends on accurate...

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Published in:Nature (London) 2002-06, Vol.417 (6889), p.639-641
Main Authors: Conte, Maureen H, Weber, John C
Format: Article
Language:English
Subjects:
Aerosols
Aerosols - chemistry
Air masses
Animal and plant ecology
Animal, plant and microbial ecology
Atmosphere - chemistry
Autoecology
Bermuda
Biological and medical sciences
Biomarkers - analysis
Biosphere
Carbon
Carbon dioxide
Carbon Dioxide - metabolism
Carbon Isotopes - metabolism
Ecosystem
Flowers & plants
Fundamental and applied biological sciences. Psychology
Heterogeneity
Humanities and Social Sciences
Isotopes
letter
Marine ecosystems
multidisciplinary
North America
Oceans
Photosynthesis
Plants - metabolism
Plants and fungi
Science
Science (multidisciplinary)
Seasonal variations
Seasons
Terrestrial environments
Waxes - chemistry
Waxes - metabolism
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description Carbon uptake by the oceans and by the terrestrial biosphere can be partitioned using changes in the 12C/13C isotopic ratio (δ13C) of atmospheric carbon dioxide, because terrestrial photosynthesis strongly discriminates against 13CO2, whereas ocean uptake does not. This approach depends on accurate estimates of the carbon isotopic discrimination of terrestrial photosynthesis (Δ; ref. 5) at large regional scales, yet terrestrial ecosystem heterogeneity makes such estimates problematic. Here we show that ablated plant wax compounds in continental air masses can be used to estimate Δ over large spatial scales and at less than monthly temporal resolution. We measured plant waxes in continental air masses advected to Bermuda, which are mainly of North American origin, and used the wax isotopic composition to estimate Δ simply. Our estimates indicate a large (5-6‰) seasonal variation in Δ of the temperate North American biosphere, with maximum discrimination occurring in late spring, coincident with the onset of production. We suggest that the observed seasonality arises from several factors, including seasonal shifts in the proportions of production by C3 and C4 plants, and environmentally controlled adjustments in the photosynthetic discrimination of C3-plant-dominated ecosystems.
doi_str_mv 10.1038/nature00777
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subjects Aerosols
Aerosols - chemistry
Air masses
Animal and plant ecology
Animal, plant and microbial ecology
Atmosphere - chemistry
Autoecology
Bermuda
Biological and medical sciences
Biomarkers - analysis
Biosphere
Carbon
Carbon dioxide
Carbon Dioxide - metabolism
Carbon Isotopes - metabolism
Ecosystem
Flowers & plants
Fundamental and applied biological sciences. Psychology
Heterogeneity
Humanities and Social Sciences
Isotopes
letter
Marine ecosystems
multidisciplinary
North America
Oceans
Photosynthesis
Plants - metabolism
Plants and fungi
Science
Science (multidisciplinary)
Seasonal variations
Seasons
Terrestrial environments
Waxes - chemistry
Waxes - metabolism
title Plant biomarkers in aerosols record isotopic discrimination of terrestrial photosynthesis
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