Red coral effectively recovers in Mediterranean protected areas after decades of overexploitation

Protection measures of the Marine Protected Areas have enable red coral colonies (Corallium rubrum) to recover partially in the Mediterranean Sea, reaching health levels similar to those of the 1980s in Catalonia and of the 1960s in the Ligurian Sea (Northwestern Italy).

Sub-national “climate clubs” could offer key to combating climate change

‘Climate clubs’ offering membership for sub-national states, in addition to just countries, could speed up progress towards a globally-harmonised climate change policy, which in turn offers a way to achieve stronger climate policies in all countries.

Victoria Reyes-García receives an ERC Proof of Concept grant linked to the LICCI project

Victoria Reyes-García ICREA Research Professor at the Institute of Environmental Science and Technology of the Universitat Autònoma de Barcelona (ICTA-UAB) is one of the 76 top researchers that will receive ERC Proof of Concept grants.

ICTA-UAB demands the UAB to reduce number of flights

Given our current climate emergency, recently acknowledged by the UAB, the Institute of Environmental Science and Technology of the Universitat Autònoma de Barcelona (ICTA-UAB) has drawn up a proposal urging the University to put into action a new travel policy to tackle one of its most polluting activities: Flying.

New assessment finds EU electricity decarbonization discourse in need of overhaul

It’s well known that the EU is focusing its efforts on decarbonizing its economy.

ICTA-UAB to organize the International Conference 2020 on Low-Carbon Lifestyle Changes

ICTA-UAB will host the International Conference 2020 on Low-Carbon Lifestyle Changes with the aim of exploring the role of changing lifestyles in climate change mitigation.

Iron availability in seawater, key to explaining the amount and distribution of fish in the oceans

People tend to pay more attention to how much food they are eating, than with how rich their diet is in essential micronutrients like iron.

Mining waste dumped into Portmán Bay continues to release metals into the sea 25 years later

The waters of the Mediterranean Sea continue to receive dissolved metals from the mining waste deposited in Portmán Bay (Murcia) 25 years after the cessation of mining activity.

A new ICTA-UAB project to assess the impacts of micro- and nano-plastics in the tropical and temperate oceans

A new project led by ICTA-UAB researcher Patrizia Ziveri is one of five projects selected for funding by the Joint Programming Initiative Healthy and Productive Seas and Oceans (JPI Oceans).

Big data reveals extraordinary unity underlying life’s diversity

Limits to growth lie at the heart of how all living things function, according to a new study carried out by ICTA-UAB researchers  .

Jeroen van den Bergh, awarded an honorary doctorate by the Open University of the Netherlands

The environmental economist at ICTA-UAB Prof. Dr Jeroen van den Bergh was awarded an honorary doctorate by the Open University of the Netherlands.

High lead concentrations found in Amazonian wildlife

Researchers from ICTA-UAB and the UVic-UCC detect high levels of lead concentration in wildlife samples from the Peruvian Amazon caused by lead-based ammunition and oil-related pollution in extraction areas.

Study gauges trees’ potential to slow global warming in the future

The Pyrenean forests, the Cantabrian coast and Galicia show an important potential to accumulate even larger amounts of carbon dioxide in the future and thus help to slow down the increase in CO2 concentrations which are warming the planet.

Why do environmentalists eat meat?

A study by researchers at the ICTA-UAB analyses the reasons why environmentally-minded scientists find it difficult to give up meat consumption, one of the world's greatest environmental problems.

La gestión del verde urbano permite incrementar la presencia de pájaros en las ciudades

Incrementar la biodiversidad del verde urbano permitiría aumentar la presencia de aves paseriformes en las ciudades mediterráneas, según un estudio científico realizado por investigadores del Instituto de Ciencia y Tecnología Ambientales de la Universidad Autónoma de Barcelona (ICTA-UAB) que analiza qué estrategias hay que implementar sobre la vegetación urbana para conseguir "naturalizar" las ciudades favoreciendo la entrada de flora y fauna.

The Ebro River annually dumps 2.2 billion microplastics into the sea

An ICTA-UAB study analyses the distribution and accumulation of microplastics from one of the main rivers of the western Mediterranean.
Seminaris
OCEAN & CLIMATE SEMINAR: "Hydroxylated tetraether lipids as sea surface temperature proxies in the Gulf of Lions and the Iberian Margin during the last glacial cycle", by Nina Davtian

Date: 2020-02-03

OCEAN & CLIMATE SEMINAR

 

Title: "Hydroxylated tetraether lipids as sea surface temperature proxies in the Gulf of Lions and the Iberian Margin during the last glacial cycle"
 
Speaker: Nina Davtian,  Collège de France, CEREGE, France
 

Date: Monday, February 3rd 2020
Time: 12h
Venue: Room Z/022-23

 

Abstract: Hydroxylated tetraethers (OH-GDGTs) are membrane lipids produced by ammonia-oxidizing archaea. Following a regional and global core-top study, the ubiquity of OH-GDGTs has been established in the marine realm and novel organic proxies, the Ring Indices of OH-GDGTs (RI-OH and RI-OH') have been proposed for sea surface temperature (SST) reconstructions. The novel RI-OH and RI-OH' proxies are thus potential alternatives to established SST proxies, such as the oxygen isotopic composition of planktic foraminifers, the C37 ketone unsaturation ratio (UK′37) and the TetraEther indeX of tetraethers consisting of 86 carbon atoms (TEX86). However, the paleothermometric potential of RI-OH and RI-OH' has barely been tested in paleoclimatic archives. In this seminar, I will report the analytical developments I conducted during my PhD to improve the analysis of tetraether-based proxies. Then, I will introduce two promising attempts to validate the novel RI-OH and RI-OH' SST proxies under contrasting (paleo)environemental contexts during the last glacial cycle (last 160,000 years). The first attempt focuses on RI-OH-based paleothermometry in a shallow core from the Gulf of Lions in the western Mediterranean Sea. The second attempt focuses on RI-OH'-based paleothermometry in a deep-sea sediment core located in the Iberian Margin. More specifically, I will present the main results based on proxy-proxy comparisons for both attempts, a regional compilation of glacial-interglacial SST anomalies for the first attempt and phase relationship studies as well as the application of the bipolar seesaw model for the second attempt. 

Bio:
Nina Davtian is a postdoctoral research assistant at the Collège de France, Climate and Ocean Evolution, CEREGE, France. She started her education as an undergraduate at the prestigious ENS de Lyon, and completed several research internships, including one at CEREGE (cosmogenic isotopes) and another at MARUM, Germany (organic geochemistry). After her PhD at CEREGE/Aix-Marseille University, she started to further validate novel organic paleothermometers, which she first tested with the analytical method that she developed during her PhD. More specifically, Nina performs proxy-proxy comparisons and phase relationship studies between proxies in a given study site as well as between marine and ice core climatic records. Nina's present reasearch interests include tetraether-based paleothermometers and source indicators as well as paleoclimatology, paleoenvironments and paleoceanography (Quaternary glacial-interglacial cycles and millenial climatic events). Furthermore, Nina is motivated to broaden her areas of expertise by working on other biomarkers than tetraethers, conducting compound specific isotope analyses, including radiocarbon, and studying modern samples as well as pre-Quaternary climatic archives.

ICTA's Activities