A5078786897- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Meteorological Phenomena and Simulations
- Marine and coastal ecosystems
- Atmospheric aerosols and clouds
- Climate variability and models
- Spectroscopy and Laser Applications
- Plant Water Relations and Carbon Dynamics
- Hydrocarbon exploration and reservoir analysis
- Wind and Air Flow Studies
- Advanced Chemical Sensor Technologies
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Water Quality Monitoring and Analysis
- Isotope Analysis in Ecology
- Groundwater and Isotope Geochemistry
- Remote Sensing in Agriculture
- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Social Acceptance of Renewable Energy
- Geological Studies and Exploration
- demographic modeling and climate adaptation
- Ecology, Conservation, and Geographical Studies
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2020-2024
GFZ Helmholtz Centre for Geosciences
2014-2022
German Council on Foreign Relations
2022
University of Bayreuth
2014
Karlsruhe Institute of Technology
2014
Arctic permafrost caps vast amounts of old, geologic methane (CH4) in subsurface reservoirs. Thawing opens pathways for this CH4 to migrate the surface. However, occurrence emissions and their contribution budget addition recent, biogenic is uncertain. Here we present a high-resolution (100 m × 100 m) regional (10,000 km²) flux map Mackenzie Delta, Canada, based on airborne data from July 2012 2013. We identify strong, likely solely where discontinuous. These peaks are 13 times larger than...
Eutrophication of inland waters is an environmental issue that becoming more common with climatic variability. Monitoring this aquatic problem commonly based on the chlorophyll-a concentration monitored by routine sampling limited temporal and spatial coverage. Remote sensing data can be used to improve monitoring, especially after launch MultiSpectral Instrument (MSI) Sentinel-2. In study, we compared estimation (chl-a) from different bio-optical algorithms using hyperspectral proximal...
Abstract. Low-level flights over tundra wetlands in Alaska and Canada have been conducted during the Airborne Measurements of Methane Emissions (AirMeth) campaigns to measure turbulent methane fluxes atmosphere. In this paper we describe instrumentation new calibration procedures for essential pressure parameters required turbulence sensing by aircraft that exploit suitable regular measurement flight legs without need dedicated patterns. We estimate accuracy mean wind measurements. show...
Abstract. Water stable isotopes (δ18O and δ2H) were analyzed in samples collected lakes, associated with riverine systems northeastern Germany, throughout 2020. The dataset (Aichner et al., 2021; https://doi.org/10.1594/PANGAEA.935633) is derived from water at (a) lake shores (sampled March July 2020), (b) buoys which temporarily installed deep parts of the monthly to October (c) multiple spatially distributed spots four selected lakes (in September (d) outflow Müggelsee biweekly 2020...
Waterbodies in the arctic permafrost zone are considered a major source of greenhouse gas methane (CH4 ) addition to CH4 emissions from wetlands. However, spatio-temporal variability fluxes waterbodies complicates spatial extrapolation measurements single waterbodies. Therefore, their contribution budget is not yet well understood. Using example two study areas 1,000 km² each Mackenzie Delta, Canada, we approach this issue (i) by analyzing correlations on landscape scale between numerous and...
Abstract. To investigate if the LI-COR humidity sensor can be used as a replacement of Lyman-alpha for airborne applications, measurement data and several sensors are analysed in direct intercomparison flights on different platforms. One vibration isolated closed-path two non-isolated open-path were installed Dornier 128 twin engine turbo-prop aircraft. The provided absolute values fluctuations water vapour mixing ratio good agreement with Lyman-alpha. signals showed considerable...
Abstract. The objective of this study was to upscale airborne flux measurements sensible heat and latent develop high-resolution maps. In order support the evaluation coupled atmospheric–land-surface models we investigated spatial patterns energy fluxes in relation land-surface properties. We used eddy-covariance acquired by Polar 5 research aircraft June–July 2012 analyze surface fluxes. Footprint-weighted properties were then related 21 529 observations 25 608 using both remote sensing...
Recently, the United States Geological Service (USGS) released a new provisional product which estimates aquatic reflectance from Landsat 8 Operational Land Imager (OLI), called Provisional Aquatic Reflectance (L8PAR). However, as indicated in guide, use of this for inland waters needs further verification and improvements. The goal study was to determine how novel L8PAR performs different small turbid eutrophic lakes Northern Germany compared situ measurements above water remote sensing...
Abstract The Earth's surface is heterogeneous at multiple scales owing to spatial variability in various properties. atmospheric responses these heterogeneities through fluxes of energy, water, carbon, and other scalars are scale‐dependent nonlinear. Although exchanges can be measured using the eddy covariance technique, widely used tower‐based measurement approaches suffer from spectral losses lower frequencies when typical averaging times. However, spatially resolved measurements such as...
The Earth’s surface is heterogeneous at multiple scales owing to spatial variability in various properties. atmospheric responses these heterogeneities through fluxes of energy, water, carbon and other scalars are scale-dependent non-linear. Although exchanges can be measured using the eddy covariance technique, widely used tower-based measurement approaches suffer from spectral losses lower frequencies when typical averaging times. However, spatially resolved measurements such as airborne...
Abstract. Low level flights over tundra wetlands in Alaska and Canada have been conducted during the AirMeth campaigns to measure turbulent methane fluxes into atmosphere. In this paper we describe instrumentation new calibration procedures for essential pressure parameters required turbulence sensing by an aircraft that exploit suitable regular measurement flight legs without need dedicated patterns. We estimate accuracy of mean wind measurements. show airborne measurements carbon dioxide...
In recent decades, inland water remote sensing has seen growing interest and very strong development. This includes improved spatial resolution, increased revisiting times, advanced multispectral sensors recently even hyperspectral sensors. However, waters are more challenging than oceanic due to their higher complexity of optically active constituents stronger adjacency effects small size nearby vegetation built structures. Thus, bio-optical modeling requires ground-truthing efforts....
Abstract. Water isotopes (δ2H and δ18O) were analyzed in samples collected lakes associated to riverine systems northeastern Germany throughout 2020. The dataset (Aichner et al., 2021) is derived from water at a) lake shores (sampled March July 2020); b) buoys which temporarily installed deep parts of the monthly October c) multiple spatially distributed spots four selected September d) outflow Müggelsee biweekly 2020 January 2021). At shores, was sampled with a pipette 40–60 cm below...