Open AccessNegative carbon isotope excursions: an interpretive framework
Author(s) -
Pam Vervoort,
Markus Adloff,
Sarah E. Greene,
S. Kirtland Turner
Publication year - 2019
Publication title -
environmental research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.37
H-Index - 124
ISSN - 1748-9326
DOI - 10.1088/1748-9326/ab3318
Subject(s) - carbon cycle , carbon fibers , isotopes of carbon , environmental science , atmospheric sciences , duration (music) , total organic carbon , carbonate , climate change , atmosphere (unit) , climatology , geology , environmental chemistry , chemistry , meteorology , materials science , oceanography , ecosystem , ecology , physics , organic chemistry , composite number , acoustics , composite material , biology
Numerous negative carbon isotope excursions (nCIEs) in the geologic record occurring over 10 4 –10 5 years are interpreted as episodes of massive carbon release. nCIEs help to illuminate the connection between past carbon cycling and climate variability. Theoretically, the size of a nCIE can be used to determine the mass of carbon released, provided that the carbon source is known or other environmental changes such as temperature or ocean pH can be constrained. A simple isotopic mass balance equation often serves as a first order estimate for the mass of carbon input, but this approach ignores the effects of negative carbon cycle-climate feedbacks. Here we show, using 432 earth system model simulations, that the mass of carbon release and associated environmental impacts for a nCIE of a given size and carbon source depend on the onset duration of that nCIE: the longer the nCIE onset duration, the greater the required carbon input in order to counterbalance the input of 13 C-enriched carbon through carbonate compensation and weathering feedbacks. On timescales >10 3 years, these feedbacks remove carbon from the atmosphere so that the relative rise in atmospheric CO 2 decreases with the nCIE onset duration. Consequently, the impacts on global temperature, surface ocean pH and saturation state are reduced if the nCIE has a long onset duration. The framework provided here demonstrates how constraints on the total nCIE duration and relative shape—together determining the onset duration—affect the interpretation of sedimentary nCIEs. Finally, we evaluate selected well-studied nCIEs, including the Eocene Thermal Maximum 2 (∼54 Ma), the Paleocene–Eocene Thermal Maximum (∼56 Ma), and the Aptian Oceanic Anoxic Event (∼120 Ma), in the context of our model-based framework and show how modeled environmental changes can be used to narrow down the most likely carbon emissions scenarios.