Axial-obliquity control on the greenhouse carbon budget through mid- to high-latitude reservoirs

0441373 - GFÚ 2016 RIV US eng J - Journal Article
Laurin, Jiří - Meyers, S. R. - Uličný, David - Jarvis, I. - Sageman, B. B.
Axial-obliquity control on the greenhouse carbon budget through mid- to high-latitude reservoirs.
Paleoceanography. Roč. 30, č. 2 (2015), s. 133-149. ISSN 0883-8305
R&D Projects: GA MŠMT LH12041; GA ČR GAP210/10/1991
Institutional support: RVO:67985530
Keywords : Cretaceous * carbon cycle * Milankovitch forcing
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 3.433, year: 2015

Carbon sources and sinks are key components of the climate feedback system, yet their response to external forcing remains poorly constrained, particularly for past greenhouse climates. Carbon-isotope data indicate systematic, million-year-scale transfers of carbon between surface reservoirs during and immediately after the Late Cretaceous thermal maximum (peaking in the Cenomanian-Turonian, circa 97-91 million years, Myr, ago). Here we calibrate Albian to Campanian (108-72 Myr ago) high-resolution carbon isotope records with a refined chronology and demonstrate how net transfers between reservoirs are plausibly controlled by similar to 1 Myr changes in the amplitude of axial obliquity. The amplitude-modulating terms are absent from the frequency domain representation of insolation series and require a nonlinear, cumulative mechanism to become expressed in power spectra of isotope time series.
Permanent Link: http://hdl.handle.net/11104/0244390