Projekt

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Towards an improved understanding of the tundra energy balance - dependence of radiative transfer on vegetation type

Titel Englisch Towards an improved understanding of the tundra energy balance - dependence of radiative transfer on vegetation type
Gesuchsteller/in Schaepman-Strub Gabriela
Nummer 140631
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Institut für Evolutionsbiologie und Umweltwissenschaften Universität Zürich
Hochschule Universität Zürich - ZH
Hauptdisziplin Andere Gebiete der Umweltwissenschaften
Beginn/Ende 01.09.2012 - 31.08.2015
Bewilligter Betrag 206'867.00
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Alle Disziplinen (3)

Disziplin
Andere Gebiete der Umweltwissenschaften
Klimatologie, Atmosphärenphysik, Aeronomie
Umweltforschung

Keywords (5)

Radiative transfer modelling; Land surface energy budget; Shortwave radiation partitioning; Climate change; Tundra ecosystems

Lay Summary (Englisch)

Lead
Lay summary
Climate change in the Arctic is more extensive and faster than expected. Changes in the physical system will lead to vegetation shifts, such as shrub encroachment. These vegetation changes will ultimately feedback to the climate system through altering energy and carbon fluxes.  Changes in energy fluxes are closely linked to the carbon cycle through processes such as productivity, nutrient availability, greenhouse gas emission (e.g. methane), and permafrost thawing potentially resulting in the release of large carbon stocks currently locked in the permafrost.
The goal of this study is to contribute towards an increased understanding of the permafrost-biosphere-atmosphere interactions through energy fluxes in the Arctic tundra, from local to regional scales. The project will – for the first time – simulate shortwave radiation fluxes for selected tundra vegetation types based on a sophisticated 3D radiative transfer model (DART), in combination with validation measurements performed at a pristine northeast Siberian field site. The model allows testing sensitivities of the shortwave energy fluxes, as a function of vegetation composition and structure, sun angle, and irradiance conditions. Through this study, we expect to find a simplified parametrization of shortwave energy fluxes in tundra vegetation, and to contribute towards a more accurate prediction of vegetation feedbacks in the vulnerable Arctic system under future climate change scenarios.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Name Institut

Publikationen

Publikation
Contrasting radiation and soil heat fluxes in Arctic shrub and wet sedge tundra
Juszak I., Eugster W., Heijmans M.M.P.D., Schaepman-Strub G. (2016), Contrasting radiation and soil heat fluxes in Arctic shrub and wet sedge tundra, in Biogeosciences, 13, 4049-4064.
Climate sensitivity of shrub growth across the tundra biome
Myers-Smith I.H., ... Schaepman-Strub G. et al. (2015), Climate sensitivity of shrub growth across the tundra biome, in Nature Climate Change, 5, 887-891.
Arctic shrub effects on NDVI, summer albedo and soil shading
Juszak Inge, Erb Angela M., Maximov Trofim C., Schaepman-Strub Gabriela (2014), Arctic shrub effects on NDVI, summer albedo and soil shading, in REMOTE SENSING OF ENVIRONMENT, 153, 79-89.
Evaluation of a plot-scale methane emission model using eddy covariance observations and footprint modelling
Budishchev A., Mi Y., van Huissteden J., Belelli-Marchesini L., Schaepman-Strub G., Parmentier F. J. W., Fratini G., Gallagher A., Maximov T. C., Dolman A. J. (2014), Evaluation of a plot-scale methane emission model using eddy covariance observations and footprint modelling, in BIOGEOSCIENCES, 11(17), 4651-4664.
Drivers of shortwave radiation fluxes in Arctic tundra across scales
Juszak Inge, Iturrate-Garcia Maitane, Gastellu-Etchegorry Jean-Philippe, Schaepman Michael, Maximov Trofim, Schaepman-Strub Gabriela, Drivers of shortwave radiation fluxes in Arctic tundra across scales, in Remote Sensing of Environment.
Interactive effects between plant functional types and soil factors on tundra species diversity and community composition
Iturrate-Garcia Maitane, Interactive effects between plant functional types and soil factors on tundra species diversity and community composition, in Ecology and Evolution.

Zusammenarbeit

Gruppe / Person Land
Formen der Zusammenarbeit
Nature Conservation and Plant Ecology/ Environmental Sciences/ Wageningen University Niederlande (Europa)
- Publikation
- Forschungsinfrastrukturen
Institute for Biological Problems of Cryolithozone/ SB Russian Academy Sciences, Yakutsk Russland (Europa)
- Publikation
- Forschungsinfrastrukturen
CESBIO Frankreich (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
Faculty of Earth and Life Sciences/ Free University of Amsterdam Niederlande (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation

Wissenschaftliche Veranstaltungen

Aktiver Beitrag

Titel Art des Beitrags Titel des Artikels oder Beitrages Datum Ort Beteiligte Personen
36th International Symposium on Remote Sensing of Environment Vortrag im Rahmen einer Tagung Internationally Coordinated Validation of Satellite-Derived Land Surface Products 11.05.2015 Berlin, Deutschland Schaepman-Strub Gabriela;
EGU General Assembly Poster The impact of vegetation type on the shortwave radiation balance of the Arctic tundra 12.04.2015 Vienna, Österreich Schaepman-Strub Gabriela; Juszak Inge;
EGU General Assembly Vortrag im Rahmen einer Tagung validation of satellite-derived land surface variables - international coordination and status 12.04.2015 Vienna, Österreich Schaepman-Strub Gabriela;
AGU 2014 Vortrag im Rahmen einer Tagung Assessment of Satellite-Derived Essential Climate Variables in the Terrestrial Domain: An Overview of the Ceos LPV Subgroup 15.12.2014 San Francisco, Vereinigte Staaten von Amerika Schaepman-Strub Gabriela;
8th annual international symposium on "C/H2O/Energy balance and climate over boreal and arctic regions with special emphasis on eastern Eurasia" Vortrag im Rahmen einer Tagung Effects of Arctic tundra vegetation types on the shortwave radiation balance 10.11.2014 Wageningen, Niederlande Schaepman-Strub Gabriela; Juszak Inge;
The Climate Symposium 2014 Poster Current state, data and methodological needs for the validation of satellite-derived land surface variables in support of the climate observing system 13.10.2014 Darmstadt, Deutschland Schaepman-Strub Gabriela;
Hydrologic Sciences Graduate Groups Seminar Einzelvortrag Vegetation-Climate Interactions in the Siberian Arctic Tundra 24.04.2014 Davis, Vereinigte Staaten von Amerika Juszak Inge; Schaepman-Strub Gabriela;
Tundra ecosystem change: Scaling shrub expansion from site to biome Vortrag im Rahmen einer Tagung Effect of shrubification on shortwave radiation fluxes in the Siberian Arctic 24.02.2014 Leipzig, Deutschland Schaepman-Strub Gabriela; Juszak Inge;
Global vegetation monitoring and modeling (GV2M), Avignon, France, 03.-07.02.2014 Vortrag im Rahmen einer Tagung Effect of shrubification on shortwave radiation fluxes in the Siberian Arctic 03.02.2014 Avignon, Frankreich Juszak Inge; Schaepman-Strub Gabriela;
Arctic Vegetation Archive Workshop Vortrag im Rahmen einer Tagung Towards assessing biodiversity feedbacks to climate in the Arctic - future applicatoin of the AVA 14.04.2013 Krakau, Polen Schaepman-Strub Gabriela;
TR32-HOBE International Symposium on “Patterns in Soil-Vegetation-Atmosphere Systems: Monitoring, Modelling & Data Assimilation” Vortrag im Rahmen einer Tagung Shortwave radiation interaction with highly patterned tundra vegetation 11.03.2013 Bonn, Deutschland Juszak Inge; Schaepman-Strub Gabriela;
AGU 2012 Vortrag im Rahmen einer Tagung Shortwave radiation interaction with highly patterned tundra vegetation and feedbacks to permafrost soil and atmosphere 03.12.2012 San Francisco, Vereinigte Staaten von Amerika Schaepman-Strub Gabriela;


Kommunikation mit der Öffentlichkeit

Kommunikation Titel Medien Ort Jahr
Referate/Veranstaltungen/Ausstellungen "Wie beeinflussen sich Licht und Biodiversität?", Scientifica Deutschschweiz 2015
Medienarbeit: Radio, Fernsehen Klimawandel beeinflusst Vegetation in der Tundra SRF 4 News Deutschschweiz 2013
Neue Medien (Web, Blogs, Podcasts, NewsFeed, usw.) Siberia field work blog UZH blog and news International Deutschschweiz 2013
Referate/Veranstaltungen/Ausstellungen "Remote Sensing und Ökologie", Vortrag für die Naturforschenden Gesellschaft Zürich Deutschschweiz 2012

Auszeichnungen

Titel Jahr
Award by the Parliament of the Republic of Sacha for scientific contribution to climate and biodiversity research 2016
European Geophysical Union, General Assembly, Outstanding Student Poster Award of the Programme Group Past-Present-Future climates (CL4). Award consists of free admission to EGU 2017 and a free publication to one of the EGU open access journals. 2015

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
135395 Towards an improved understanding of the Global Energy Balance: absorption of solar radiation 01.01.2012 Projektförderung (Abt. I-III)

Abstract

Climate change in the Arctic is more extensive and faster than expected. Changes in the physical system will lead to vegetation shifts, such as shrub encroachment as can already be observed in many regions of the Arctic. The vegetation changes will ultimately feedback to the climate system through altering energy and carbon fluxes. Two examples of feedbacks driven by altered shortwave energy fluxes are a decreasing albedo but increasing soil shading with increasing shrub growth; and changes in species competition through shifts of light available for photosynthesis within the canopy. Changes in energy fluxes are closely linked to the carbon cycle through processes such as productivity, nutrient availability influenced by soil temperature, greenhouse gas exchange with the atmosphere (e.g. methane emissions), and potential release of large carbon stocks currently locked in the permafrost. The longterm goal of the applicant is to contribute to the understanding, quantification, and simplified, yet accurate parameterization of the permafrost-biosphere-atmosphere interactions through energy fluxes in the Arctic, from local to regional scales. She co-supervised a PhD in NE Siberia working on observational and experimental evidence on the effects of shrubs on energy fluxes. It is now proposed to extend this work to all major vegetation types occurring at the site. Methodologically, this work will expand previous mainly observational-based methods with 3-dimensional modelling. This project will - for the first time - simulate shortwave radiation fluxes for selected tundra vegetation types based on a sophisticated 3D radiative transfer model (DART) in combination with in situ validation measurements. The model allows testing sensitivities of the shortwave energy fluxes (albedo, vertical profile of radiation, and transmitted radiation at the ground level) between the biosphere and atmosphere, as a function of vegetation composition and structure, sun angle, as well as irradiance conditions. Through this study, we expect to find a simplified parameterization of shortwave energy fluxes in tundra vegetation, as well as contribute to a more accurate prediction of vegetation feedbacks under future climate change scenarios. The results of the project will contribute to an increased accuracy of shortwave energy budget predictions and their feedback on permafrost and climate in the vulnerable Arctic system.
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