H2020Индивидуална стипендия2019–2021

WetSlide · WEaThering in bedrock landSLIDE deposits

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

Период: 2019-10-01 → 2021-09-30
Финансиране от ЕС: 162 806 €
Участници: 1
Схема: MSCA-IF-EF-RI

Линиите свързват координатора с партньорите.

Накратко на български

Химичното разграждане на скалите при свлагвания помага да се разбере как минералите улавят или освобождават въглероден диоксид. Това е важно за разбирането на глобалния въглероден цикъл и влиянието му върху климата на Земята.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

WEaThering in bedrock landSLIDE deposits

Understanding Earth’s climate system is a key scientific challenge of the 21st century. It is a basis to climate change mitigation and adaptation and underpins, for example, the study of Earth surface dynamics, the evolution of life, and the sedimentary rock record. Earth’s climate is linked to the concentration of carbon dioxide (CO2) in the atmosphere and, thus, to the global carbon cycle. An important component of the carbon cycle is the chemical dissociation (weathering) of rocks near Earth’s surface. Where silicate minerals are exposed to the surface of the Earth by uplift and erosion, they weather and drive the precipitation of carbonate minerals. The carbonates lock up carbon in the rock record over hundreds of millions of years. Rates of weathering reactions are controlled by the availability of weatherable bedrock. Uplifting mountain ranges expose >50% of the global rock mass. Therefore, they are hotspots for chemical weathering and could dramatically alter Earth’s climate. However, our understanding of the link between exposure of rock by erosion and their chemical weathering is limited by three main knowledge gaps (KG). KG1: Existing datasets that link erosion and chemical weathering fluxes are characterized by a co-variation between erosion rate and climate. Thus, it remains difficult to unravel the relative importance on chemical weathering of climate and the exposure of fresh minerals. KG2: Weathering rates and their effect on atmospheric CO2 depend strongly on mineralogy. Whereas silicate weathering with carbonic acid sequesters CO2, the oxidation of sulfides (such as pyrite) coupled to carbonate dissolution releases CO2 to the atmosphere. The effect of different lithologies on chemical weathering is poorly understood. KG3: Weathering models are based on the continuous chemical alteration of bedrock and the formation of soils. However, as erosion rates increase, stochastic landslides dominate the exposure of rock and may strongly influence weathering fluxes. However, no models and very few data exist that explore chemical weathering of landslide deposits. The proposed aim of WetSlide was to address KG3 with newly acquired data from New Zealand. However, a re-analysis of the literature and the covid pandemic led us to address KG1-3 (see below). This change affected the order of scientific investigations, but the dissemination, communication, mentoring, career development, and training goals were largely met as planned.

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

Цел на проекта

Understanding Earth’s climate system is a major aim of the H2020 work programme. The chemical weathering of silicate and carbonate minerals is a key component of Earth’s climate system by exchanging large volumes of carbon between atmospheric and geologic reservoirs. Commonly, weathering models focus on the steady production, chemical alteration, and erosion of regolith and soil. However, the majority of fresh, weatherable sediment on Earth’s surface is produced in active mountain ranges where unsteady bedrock landsliding is the dominant erosion process. There, existing weathering models do not apply. The lack of data and models for chemical weathering in bedrock landslide deposits presents a major knowledge gap that limits our predictions of weathering dynamics and, ultimately, our understanding of Earth’s climate system. The goal of WetSlide is to quantify the impact of landslide erosion on chemical weathering fluxes from mountain ranges with three research objectives: 1) Assess millennial-scale variations of weathering rates in landslide deposits with a unique dataset of landslide-seepage-water chemistry from New Zealand; 2) Quantify erosion timescales of landslide deposits by measuring and compiling deposit volumes of dated landslides; 3) Develop and calibrate a model for weathering in landslides based on data from 1-2. This model will be combined with a regolith weathering model to estimate landscape-scale weathering fluxes. By providing the first quantitative study of weathering in landslide deposits, WetSlide has the potential to re-define the impact of mountain belt uplift on the inorganic carbon cycle and to drive a step-change in the understanding of global chemical weathering dynamics. Moreover, interdisciplinary training by experts at two world-leading research institutions will shape a competitive young researcher with a rare combination of skills who can effectively contribute to EU research excellence in integrative natural sciences.

Оригинален текст от CORDIS (на английски).

Участници

GFZ HELMHOLTZ-ZENTRUM FUR GEOFORSCHUNG · POTSDAMКоординаторГермания