A5088637885- Species Distribution and Climate Change
- Remote Sensing in Agriculture
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Horticultural and Viticultural Research
- Atmospheric Ozone and Climate
- Ecology, Conservation, and Geographical Studies
- Tree-ring climate responses
- Cryospheric studies and observations
- Vehicle emissions and performance
- Mediterranean and Iberian flora and fauna
- Botany and Plant Ecology Studies
- Urban Heat Island Mitigation
- Remote Sensing and Land Use
- Peatlands and Wetlands Ecology
- Animal and Plant Science Education
- Wind Energy Research and Development
- Lichen and fungal ecology
- Remote Sensing and LiDAR Applications
- Environmental and Cultural Studies in Latin America and Beyond
- Linguistic Education and Pedagogy
- Quantum and electron transport phenomena
- Pacific and Southeast Asian Studies
- French Urban and Social Studies
University of Bern
1996-2019
Curtin University
2015-2017
Government of Western Australia
2017
The University of Adelaide
2011
École Polytechnique Fédérale de Lausanne
1999-2004
University of Neuchâtel
1995
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 39:261-274 (2009) - DOI: https://doi.org/10.3354/cr00811 Tree phenology and carbon dioxide fluxes: use of digital photography for process-based interpretation at ecosystem scale H. E. Ahrends1,2,*, S. Etzold2, W. L. Kutsch3, R. Stoeckli4, Bruegger1, F. Jeanneret1, Wanner1, N. Buchmann2, Eugster2 1Institute Geography, University...
Vegetation phenology has a strong influence on the timing and phase of global terrestrial carbon water exchanges is an important indicator climate change variability. In this study we tested application inexpensive digital visible‐light cameras in monitoring phenology. A standard camera was mounted 45 m tall flux tower at Lägeren FLUXNET/CarboEuropeIP site (Switzerland), providing hourly images mixed beech forest. Image analysis conducted separately set regions interest representing two...
Plant phenological observations are accurately dated information of seasonal vegetation variability in midlatitude climates. In order to extend records into the past and assess climate impacts on long timescales, there is a need make use historical plant phenology. Here we present continuous, annually resolved reconstruction statistical ‘Spring plant’ defined as weighted mean for flowering cherry apple tree budburst beech from across range sites Switzerland 1702 2005. The indicates...
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 39:179-190 (2009) - DOI: https://doi.org/10.3354/cr00810 Temperature sensitivity of Swiss and British plant phenology from 1753 1958 T. Rutishauser1,2,3,*, C. Schleip4, H. Sparks5,8, Ø. Nordli6, A. Menzel4, Wanner1,2, F. Jeanneret1, J. Luterbacher1,7 1Institute Geography, University Bern, Hallerstrasse 12, 3012 Switzerland...
A new indicator is proposed for determining if tropospheric ozone production in a specific area limited by VOC or NO x . The Θ = τ OH /τ describes the ratio of lifetimes against losses reacting with and Whereas can be obtained conventional measurements, pump probe approach which described part one this publication makes it now possible to obtain also Indicator values above threshold value 0.2±50% are representative ‐saturated conditions where an increase emissions causes lower production....
A new method to investigate atmospheric chemical kinetics is presented. It based on the pump and probe principle. Preliminary measurements are described decay rate of OH in planetary boundary layer its concentration has been raised by laser flash photolysis background ozone subsequent reaction O(1D) with water vapor. The measured disappearance compared model calculations yielding information fast OH. presented point can be extended a range resolved differential absorption LIDAR technique.
The reactivity of hydroxyl radical (OH) with total volatile organic compounds (VOC), Σ k VOC [VOC], is directly obtained in the planetary boundary layer (PBL). method based on a perturbation technique where high initial OH concentrations are created by flash photolysis ozone and subsequent reaction O( 1 D ) H 2 O. Laser‐induced fluorescence used to measure residual concentration at different time delays after (<100 ms) obtain direct estimate lifetime τ for atmospheric conditions. For...
This study describes the verification of Wind Atlas Analysis and Application program (WAsP) modelled average wind speeds in a complex terrain. WAsP model was run using data collected at 3 masts: Kalkumpei, Nyiru Sirima cup anemometers vanes for entire 2009 calendar year verified by WindTracer LIDAR (light detection ranging) 2 weeks from 11th to 24th July 2009. Evaluating mean speed map showed that station provides best over farm domain with difference 0.16 m/s, root square error 0.85 m/s...
Many wind-field mapping applications require range-resolved atmospheric velocity measurements at long range and/or with a temporal resolution sufficient to investigate turbulence. We argue that this capability can be achieved only by coherent laser radar systems transmit energetic (>1 mJ) pulses. describe such system and single-pulse measurement of the line-of-sight velocities, show instrument-limited reproducibility is 0.4 ms−1.
The LIDAR (LIght Detection And Ranging) technique has developed into one of the practical high performance techniques for conducting air quality and meteorological measurements. DIfferential Absorption Lidar (DIAL) is used measuring trace gases, including pollutants like ozone at low concentrations. Multiple wavelengths backscatter depolarization measurements give information about particles in atmosphere, single wavelength lidar can be wind velocity temperature. Range resolved situ data...
Abstract. In 1970, the Institute of Geography University Bern initiated phenological observation network BernClim. Seasonality information from plants, fog and snow was originally available for applications in urban regional planning agricultural touristic suitability is now a valuable data set climate change impact studies. Covering growing season, volunteer observers record dates key development stages hazel (Corylus avellana), dandelion (Taraxacum officinale), apple tree (Pyrus malus)...
Phenology studies the seasonally recurring growth and development of living creatures abiotic phenomenon. It deals with observing dates plant developmental phases (from leafing to leaf fall), bird migrations(arrival takeoff migratory birds), or frost occurrence freezing water courses other Plant phenology is well suited as an indicator for bio-monitoring environmental changes, such actual climate warming, organisms reflect integrated reaction environment. In Switzerland Meteo-Swiss has run a...
Many physical similarities exist between the European Alps and Southern of New Zealand. This may be reason why settlers (re)named Ka Tiritiri o te Moana—the Maori name for long stretch alpine country that crosses Te Wahi Pounamu or South Island from southwest to northeast— Alps. But both major mountain ranges have very different landscape histories cultural heritages: a centuries-old history at heart densely populated Continent rich adaptation Polynesian cultures on an island (fairly)...