# Paleoenvironmental changes, climate and anthropisation in the Western Mediterranean Sea during the 4.2 Kyr event along a North-South Transect.

Nathalie Combourieu-Nebout, Vincent Coussin, Y. Miras, Aurélie Penaud, Sandra Picard Casal, Odile Peyron, Bassem Jalali, Marie-Alexandrine Sicre, Nathalie Babonneau, Antonio Cattaneo

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Nathalie Combourieu-Nebout, Vincent Coussin, Y. Miras, Aurélie Penaud, Sandra Picard Casal, et al. Paleoenvironmental changes, climate and anthropisation in the Western Mediterranean Sea during the 4.2 Kyr event along a North-South Transect. European Geoscience Union General Assembly 2020, May 2020, Vienne, Austria., 2020, 10.5194/egusphere-egu2020-17652. [https://doi.org/10.5194/egusphere-egu2020-17652](https://doi.org/10.5194/egusphere-egu2020-17652). [hal-03364727](https://HAL.inistre.fr/hal-03364727)

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Submitted on 9 Jun 2023

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# Paleoenvironmental changes, climate and anthropisation in the Western Mediterranean Sea during the 4.2 Kyr event along a North-South transect

Nathalie COMBOURIEU-NEBOUT

Vincent COUSSIN

Yannick MIRAS

Aurélie PENAUD

Sandra PICARD CASAL

Odile PEYRON

Bassem JALALI

Marie Alexandrine SICRE

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KSGC-31 : 4.2 Event

Multi-proxy approach

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4.2 event

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T°C decreasing trend from 4.4 to 3.8 kyr

Enhanced drought ⇒ ↑ cold/dry winds

Human impact ⇒ population movements ?

Warm

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Log Fagus/Quercus
occurrence ratio
(This study)

(Azuara et al., 2015
PB-06, Palavas-les-Flots)

Cold

<figure><img src="image_13.png" /></figure>

Temperate forest
pollen concentration
(pollen grain/g)

- Anthropogenic +
impact

<figure><img src="image_14.png" /></figure>

Anthropic indicators
pollen concentration
(grain/g)

<figure><img src="image_15.png" /></figure>

4.2 event

Sea Surface Temperature
(SST, °C)

derived from alkenones

Jalali et al., 2017

Jalali et al., 2019

Warm

<figure><img src="image_16.png" /></figure>

Cold

<figure><img src="image_17.png" /></figure>

Sum of freshwater
algal NPPs
concentration
(NPP/g)

- Humidity +

<figure><img src="image_18.png" /></figure>

Steppe vegetation
pollen concentration
(grain/g)

- Aridity +

<figure><img src="image_19.png" /></figure>

Coprophilous spores
concentration
(spore/g)

- Pastoralism? +
<figure><img src="image_20.png" /></figure>

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Ocean Data View

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NORTH

SOUTH

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* Inter Tropical Convergence Zone