H2020Индивидуална стипендия2021–2023

OXYPRO · Global biological productivity during abrupt climate change

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2021-09-01 → 2023-08-31
Финансиране от ЕС: 219 312 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Промените в биологичната продуктивност на Земята се проследяват чрез измерване на изотопите на кислорода в стари ледени ядра. Това помага да се разбере как растителността и океаните реагират на резки климатични промени, което е важно за прогнозите за бъдещия климат.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Global biological productivity during abrupt climate change

The global biosphere (terrestrial vegetation and marine ecosystem) absorbs about the half the carbon emitted by human activity nowdays, via photosynthesis, contributing to reduce its impact. Since the photosynthesis is the largest single flux of carbon, for a better projection of future climate, it is essential to understand how the global biosphere would respond to upcoming climate change. Recent observations show that the global photosynthetic flux changes with climate variations - for example, atmospheric carbon dioxyde (CO2) concentration or air temperatre -, however, the major control of the global biosphere productivity is not well understood primarily because of (1) lacking long-term observation of global productivity, and (2) indirect and qualitative nature of paleoproductivity proxy records from sediment cores that complicates the estimate of global biosphere productivity of the past. This project will alleviate both problems by measuring triple isotope composition of air oxygen (O2) from the ancient air trapped in polar ice cores. The triple isotopic composition of O2 is a unique tracer of global biosphere productivity, and the polar ice core is the unique archive that preserves the ancient atmosphere in air bubbles that allows to study directly the composition of past atmosphere over the last 800 000 years. In particular, OXYPRO project aims to reconstruct the variations of the triple isotopic composition of O2 with the highest temporal resolution over the abrupt climate change events occurred during the last glacial period. These events are accompanied by abrupt warming of up to more than 10 degrees within a few decades showing a drastic change in climate and environement at global scale, and hence these events provide an optimal natural experience to study the response of global biosphere productivity to upcoming abrupt climate change and hence its impact on global carbon cycle. To achieve the goal, the objective of OXYPRO projet is twofold: (1) to reconstruct the high-resolution records of triple isotopic composition of O2 and carbonyl sulfide (COS) concentrations over the transitions of Heinrich Stadial (HS) to Dansgaard-Oeschger (DO) events from ice cores drilled in Greenland, and (2) to make quantitative interpretation of the new data by using Earth system model equipped with triple O2 isotopes.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Atmospheric oxygen (O2) is an essential component for life. The global biological O2 productivity has changed with Earth's climate change and, at the same time, has affected to global biosphere. Therefore, understanding how global biological O2 productivity responds to abrupt climate change is important to project future climate and environment change. However, former studies have been focused on global O2 productivity change over the glacial-interglacial transitions, mainly due to insufficient temporal resolution of existing data. This project aims to reconstruct the global primary productivity change over the Heinrich Stadial (HS). HS events are naturally occuring abrupt climate changes in the last glacial triggered by abrupt input of glacial meltwater into the North Atlantic Ocean. In this project, a new high-resolution record of triple oxygen isotopes of air O2 and COS concentrations will be produced throughout the HS events 1 to 5 using polar ice cores. Then the major controls and mechanisms will be explored by a series of sensitivity experiments using climate models with different complexities. This project will be carried out at the section of Physics of Ice, Climate and Earth at Niels Bohr Institute (PICE, University of Copenhagen). PICE equips the state of art analytical instruments and has developed the novel methods to study trace gas and isotopes in ice cores. The supervisor is a world expert of the triple oxygen isotopes of air O2 in ice cores. This project plans a secondment to Laboratory for Sciences of Climate and Environment (LSCE, University of Paris Saclay) for sensitivity experiments using climate models. LSCE is a leading institution of paleoclimate modelling, which allows a better understanding of major control mechanisms of the past productivity change.

Оригинален текст от CORDIS (на английски).

Участници

KOBENHAVNS UNIVERSITET · KOBENHAVNКоординаторДания