Seasonality in long-term climate change

Carré, Matthieu; Cheddadi, Rachid

doi:10.4000/quaternaire.8018

Cited by 17 publications

(17 citation statements)

References 17 publications

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“…The concentration (usually between 1,000 and 50,000 grains cm -3 ) and taxonomical diversity of marine pollen assemblages are in general high enough to allow the quantitative estimation of annual and, more importantly, seasonal temperatures and precipitation (e.g., Sánchez Goñi et al, 2002 , 2005 , 2016a ; Desprat et al, 2007 ; Combourieu Nebout et al, 2009 ) ( Figure 3 ). Knowledge about past climate seasonality is crucial to understand natural climate variability ( Carré and Cheddadi, 2017 ) and the sensitivity of vegetation to changes in this parameter makes pollen data particularly well-suited to track shifts in seasonality through time. Quantitative pollen-based climatic estimates are based on different techniques.…”

Section: Understanding Past Climate Changesmentioning

confidence: 99%

Pollen from the Deep-Sea: A Breakthrough in the Mystery of the Ice Ages

et al. 2018

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Pollen from deep-sea sedimentary sequences provides an integrated regional reconstruction of vegetation and climate (temperature, precipitation, and seasonality) on the adjacent continent. More importantly, the direct correlation of pollen, marine and ice indicators allows comparison of the atmospheric climatic changes that have affected the continent with the response of the Earth's other reservoirs, i.e., the oceans and cryosphere, without any chronological uncertainty. The study of long continuous pollen records from the European margin has revealed a changing and complex interplay between European climate, North Atlantic sea surface temperatures (SSTs), ice growth and decay, and high-and low-latitude forcing at orbital and millennial timescales. These records have shown that the amplitude of the last five terrestrial interglacials was similar above 40 • N, while below 40 • N their magnitude differed due to precessionmodulated changes in seasonality and, particularly, winter precipitation. These records also showed that vegetation response was in dynamic equilibrium with rapid climate changes such as the Dangaard-Oeschger (D-O) cycles and Heinrich events, similar in magnitude and velocity to the ongoing global warming. However, the magnitude of the millennial-scale warming events of the last glacial period was regionally-specific. Precession seems to have imprinted regions below 40 • N while obliquity, which controls average annual temperature, probably mediated the impact of D-O warming events above 40 • N. A decoupling between high-and low-latitude climate was also observed within last glacial warm (Greenland interstadials) and cold phases (Greenland stadials). The synchronous response of western European vegetation/climate and eastern North Atlantic SSTs to D-O cycles was not a pervasive feature throughout the Quaternary. During periods of ice growth such as MIS 5a/4, MIS 11c/b and MIS 19c/b, repeated millennial-scale cold-air/warm-sea decoupling events occurred on the European margin superimposed to a long-term air-sea decoupling trend. Strong air-sea thermal contrasts promoted the production of water vapor that was then transported northward by the Frontiers in Plant Science | www.frontiersin.org 1 January 2018 | Volume 9 | Article 38Sánchez Goñi et al.Pollen and Ice Ages westerlies and fed ice sheets. This interaction between long-term and shorter timescale climatic variability may have amplified insolation decreases and thus explain the Ice Ages. This hypothesis should be tested by the integration of stochastic processes in Earth models of intermediate complexity.

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Section: Understanding Past Climate Changesmentioning

confidence: 99%

Pollen from the Deep-Sea: A Breakthrough in the Mystery of the Ice Ages

et al. 2018

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“…Seasonal extremes were of vital importance for the evolution and distribution of life over geological history 1 . The effects of greenhouse warming on seasonal variability in temperature and the hydrological cycle are still poorly constrained, while being of considerable interest for projecting future climate and its impact on the ongoing biodiversity crisis 2,3 . Reconstructions of deep time (pre-Quaternary) greenhouse periods yield valuable insights into the dynamics of warm climates and the ecological response to forcing mechanisms such as rising atmospheric CO2 levels 4,5 .…”

Section: Introductionmentioning

confidence: 99%

First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells

Winter

Müller

Kocken

et al. 2021

Preprint

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Seasonal variability in sea surface temperatures plays a fundamental role in climate dynamics and species distribution. As such, it is essential to better understand seasonal variability in climates of the past. Previous reconstructions of seasonality in deep time are poorly constrained, relying on controversial assumptions such as estimates of seawater composition and neglect seasonal bias. This work presents the first absolute seasonal temperature reconstructions based on clumped isotope measurements in bivalve shells which, critically, do not rely on these assumptions. Our new approach reconstructs highly precise higher mid-latitude (~50°N) monthly temperatures from individual oyster and rudist shells of the Campanian (78 million years ago) greenhouse period (15—27 °C seasonal range). Our analysis demonstrates that seasonal bias and previous assumptions about sea water oxygen isotope composition can lead to highly inaccurate temperature reconstructions, distorting our understanding of the behavior of greenhouse climates and our ability to model them. Our results agree with fully coupled climate model simulations showing greenhouse climates outside the tropics were warmer and more seasonal than previously thought.

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“…Temperature seasonality is a critical component governing the geographic distribution of modern flora and fauna while seasonal extremes were likely also of vital importance for the evolution and distribution of life over geological history 1 . The effects of greenhouse warming on seasonal variability in temperature and the hydrological cycle are still highly unconstrained and of considerable interest to allow quantification of projections of future climate and the ongoing biodiversity crisis 2,3 . Reconstructions of deep time (pre-Quaternary) greenhouse periods yield valuable insights into the dynamics of warm climates and the ecological response to forcing mechanisms such as rising atmospheric CO2 levels 4,5 .…”

Section: Introductionmentioning

confidence: 99%

First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells

Winter

Müller

Kocken

et al. 2020

Preprint

View full text Add to dashboard Cite

The seasonal variability of sea surface temperatures plays a fundamental role in climate dynamics and species distribution. As such, it is essential to better understand seasonal variability in warm climates of the past. Previous reconstructions of seasonality in deep time are relatively unconstrained, relying on unsupported assumptions such as estimates of seawater composition and negligible seasonal bias. This work presents the first absolute seasonal temperature reconstructions based on clumped isotope measurements in bivalve shells which, critically, do not rely on these assumptions. Our new approach reconstructs highly precise mid-latitude (~50°N) monthly temperatures from individual oyster and rudist shells of the Campanian (78 million years ago) greenhouse period (15—27 °C seasonal range). Our analysis demonstrates that seasonal bias and previous assumptions about sea water oxygen isotope composition can lead to highly inaccurate temperature reconstructions, distorting our understanding of the behavior of greenhouse climates and our ability to model them. Our results agree remarkably well with fully coupled climate model simulations showing greenhouse climates outside the tropics were warmer with higher seasonality than previously thought.

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Seasonality in long-term climate change

Cited by 17 publications

References 17 publications

Pollen from the Deep-Sea: A Breakthrough in the Mystery of the Ice Ages

Pollen from the Deep-Sea: A Breakthrough in the Mystery of the Ice Ages

First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells

First absolute seasonal temperature estimates for greenhouse climate from clumped isotopes in bivalve shells

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