Ulrike Falk

Ulrike Falk
Deutscher Wetterdienst | DWD · Satellite-based Climate Monitoring

About

57
Publications
9,760
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884
Citations
Citations since 2016
19 Research Items
563 Citations
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2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120

Publications

Publications (57)
Article
Full-text available
When Antarctic glaciers retreat, high sediment loads from geomorphological and glaciological sources can disturb the biota, especially filtering organisms, and thereby significantly alter the ecology of the Antarctic coast. We applied the Finite volumE Sea-ice Ocean-Coastal Model (FESOM-C), a numerical tool equipped with a sediment module, to simul...
Article
The study area is located on King George Island, where 90% of the area is permanently glaciated. This study provides a comprehensive analysis of the inorganic and organic chemistry of snow cover in the icefield and a comparison against previous results obtained in fresh water. Snow samples were collected in the summer of 2017 in the Warszawa Icefie...
Article
Full-text available
West African Sahelian and Sudanian ecosystems provide essential services to people and also play a significant role within the global carbon cycle. However, climate and land use are dynamically changing, and uncertainty remains with respect to how these changes will affect the potential of these regions to provide food and fodder resources or how t...
Article
Full-text available
There are only a small number of recent publications discussing glacial runoff in Antarctica, and even fewer of them deal with the groundwater flow discharge. This paper focuses on the groundwater flow aspects and is based on a detailed study performed on a small hydrological catchment, informally called Potter basin, located on King George Island...
Preprint
Full-text available
West African Sahelian and Sudanian ecosystems are providing essential services to people and also play a significant role within the global carbon cycle. However, climate and land use are dynamically changing and it remains uncertain how these changes will affect the potential of these regions for providing food and fodder resources or the biospher...
Article
Full-text available
Climate change-induced glacial melt affects benthic ecosystems along the West Antarctic Peninsula, but current understanding of the effects on benthic primary production and respiration is limited. Here we demonstrate with a series of in situ community metabolism measurements that climate-related glacial melt disturbance shifts benthic communities...
Preprint
Full-text available
There is only a small number of recent publications discuss glacial runoff in Antarctica and even fewer of them deal with the groundwater flow discharge. This paper focuses on the groundwater flow aspects and is based on a detailed study performed on a small hydrological catchment, informally called Potter Basin, located on King George Island (KGI;...
Article
Full-text available
Macroalgae are the main primary producers in polar coastal regions and of major importance for the associated heterotrophic communities. On King George Island/Isla 25 de Mayo, West Antarctic Peninsula (WAP) several fjords undergo rapid glacial retreat in response to increasing atmospheric temperatures. Hence, extended meltwater plumes laden with su...
Article
Full-text available
Sedimentary architecture and morphogenetic evolution of a polar bay‐mouth gravel‐spit system are revealed based on topographic mapping, sedimentological data, radiocarbon dating and ground‐penetrating radar investigations. Data document variable rates of spit progradation in reaction to atmospheric warming synchronous to the termination of the last...
Article
Full-text available
Sea-level rise associated with changing climate is expected to pose a major challenge for societies. Based on the efforts of COP21 to limit global warming to 2.0°C or even 1.5°C by the end of the 21st century (Paris Agreement), we simulate the future contribution of the Greenland ice sheet (GrIS) to sea-level change under the low emission Represent...
Article
Although the relationship between surface air temperature and glacial discharge has been studied in the Northern Hemisphere for at least a century, similar studies for Antarctica remain scarce and only for the past four decades. This data scarcity is due to the extreme meteorological conditions and terrain inaccessibility. As a result, the contribu...
Article
Full-text available
The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP). This region was subject to strong warming trends in the atmospheric surface layer. Surface air temperature increased about 3 K in 50 years, concurrent with retreating glacier fronts, an increase in melt areas, ice surface lowering and rapid break-up and disi...
Article
Full-text available
Due to recent atmospheric and oceanic warming, the Antarctic Peninsula is one of the most challenging regions of Antarctica to understand in terms of both local- and regional-scale climate signals. Steep topography and a lack of long-term and in situ meteorological observations complicate the extrapolation of existing climate models to the sub-regi...
Article
Full-text available
Glacial meltwater discharge from Antarctica is a key influence on the marine environment, impacting ocean circulation, sea level and productivity of the pelagic and benthic ecosystems. The responses elicited depend strongly on the characteristics of the meltwater releases, including timing, spatial structure and geochemical composition. Here we use...
Article
Full-text available
The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP). This region was subject to strong warming trends in the atmospheric surface layer. Surface air temperature increased about 3 K in 50 years, concurrent with retreating glacier fronts, an increase in melt areas, ice surface lowering and rapid break-up and disi...
Article
Full-text available
Sea level rise associated with changing climate is expected to pose a major challenge for societies. Here, we estimate the future contribution of the Greenland ice sheet (GrIS) to sea level change in terms of different ice sheet atmospheric forcings arising from three general circulation models (GCMs), HadGEM2-ES, IPSL-CM5A-LR and MIROC5, for RCP2....
Conference Paper
Ensemble habitat modeling is a tool in the multivariate analysis of arbitrary species or community distribution which combines models of best fit to an optimized model (ensemble model, EM). To simulate spatial variation of communities and predict the impact of climate change, it is essential to identify the distribution-controlling factors. Macroal...
Article
Full-text available
The Antarctic Peninsula is one of the most challenging regions of Antarctica from a climatological perspective, owing to the recent atmospheric and oceanic warming. The steep topography and a lack of long–term and in situ meteorological observations complicate extrapolation of existing climate models to the sub-regional scale. Here, we present new...
Article
Full-text available
The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP) which is among the fastest warming regions on Earth. Surface air temperature increases (similar to 3 K in 50 years) are concurrent with retreating glacier fronts, an increase in melt areas, ice surface lowering and rapid break-up and disintegration of ice she...
Article
Changes of glaciers and snow cover in polar regions affect a wide range of physical and ecosystem processes on land and in the adjacent marine environment. In this study, we investigated the potential of 11-day repeat high-resolution satellite image time series from the TerraSAR-X mission to derive glaciological and hydrological parameters on King...
Article
Global warming associated with climate change is one of the greatest challenges of today’s world. Increasing emissions of the greenhouse gas CO2 are considered as a major contributing factor to global warming. One regulating factor of CO2 exchange between atmosphere and land surface is vegetation. Measurements of land cover changes in combination w...
Data
Changes of glaciers and snow cover in polar regions affect a wide range of physical and ecosystem processes on land and in the adjacent marine environment. In this study, we investigate the potential of 11-day repeat high-resolution satellite image time series from the TerraSAR-X mission to derive glaciological and hydrological parameters on King G...
Data
The South Shetland Islands are located at the northern tip of the AP which is among the fastest warming regions on Earth. The islands are especially vulnerable to climate change due to their exposure to transient low-pressure systems and their maritime climate. Surface air temperature increases (2.5K in 50 years) are concurrent with retreating glac...
Article
Full-text available
En este trabajo se analizan y compararan los dos únicos Modelos Digitales de Elevación (MDE) elaborados de manera independiente y de acceso público, que existen al presente, para el área de la Isla 25 de Mayo/King George Island (I25M), Islas Shetland del Sur, Antártida. Uno de ellos, el Radarsat Antarctic Mapping Project Digital Elevation Model Ver...
Conference Paper
Full-text available
Data of the Western Antarctic Peninsula (WAP) ice fields remains little until today, al thought his region represents a key area of rapid on - going climate change. Within the past 50 years a rise in average annual air temperature of 2.5°C has been reported for the region (Cook et al., 2005). Melting processes represent an important component of ma...
Article
The Antarctic Peninsula is amongst the fastest warming places on Earth and further temperature increase is to be expected. It has undergone rapid environmental changes in the past decades. Exceptional rates of surface air temperature increases (2.5K in 50 years) are concurrent with retreating glacier fronts, an increase in melt areas, surface lower...
Conference Paper
Detailed knowledge of land surface fluxes, especially latent and sensible components, is important for monitoring the climate and land surface, and for agriculture applications such as irrigation scheduling and water management. Accurate estimation of evapotranspiration (ET) plays an important role in quantification of the water balance at the wate...
Article
Full-text available
In this study surface velocity of glaciers in South Shetland Islands (Antarctic Peninsula) are calculated based on synthetic aperture radar data from ALOS PALSAR and TerraSAR-X as well as differential GPS measurements. The obtained glacier velocities will be used to calculate the total glacier mass budget and to better understand the contribution o...
Article
Braun, M., Pohjola, V.A., Pettersson, R., Möller, M., Finkelnburg, R., Falk, U., Scherer, D. and Schneider, C., 2011. Changes of glacier frontal positions of Vestfonna (Nordaustlandet, Svalbard). Geografiska Annaler: Series A, Physical Geography, 93, 301–310. DOI: 10.1111/j.1468-0459.2011.00437.x Glaciers in Svalbard have shown considerable mass lo...
Article
Full-text available
In West Africa, the management and efficient use of natural resources is becoming ever more important. This is largely due to steeply increasing demand through population growth and economic development, and through the effects of greater uncertainty due to climate and environmental change. Developing research capacity in these countries is an esse...
Article
Local climate warming recorded at maritime Antarctica since 50 years dramatically affects small ice caps such as on King George Island (KGI) at the Northern tip of the Antarctic Peninsula. DGPS measurements revealed surface lowering in elevations up to 270 m above ellipsoid with a maximum of 14 m over 11 years. Glacial area loss at KGI amounted to...
Article
Full-text available
The Sustainable Development of Research Capacity (SDRC) in West Africa is an 18 month project, funded by the German Ministry of Education and Research, to strengthen the research capacity, give access to data and models, and to support the establishment of the newly formed Volta Basin Authority. The SDRC project largely builds on the results and mo...
Article
In recent years, several methods have been developed to estimate the spatial distribution of actual evapotranspiration (ET) by the means of remote sensing (RS). One frequently used approach is to calculate ET from latent heat fluxes modeled as residuum of the surface energy balance. For this purpose, ground heat fluxes and sensible heat fluxes are...
Article
Full-text available
Evapotranspiration (ET) mapping from remotely sensed satellite images is critical for water management since the estimation of spatial and temporal ET distributions over large areas is impossible using only ground measurements. A major difficulty for the calibration and validation of operational ET remote sensing algorithms is the ground measuremen...
Article
Full-text available
This study reports carbon and water fluxes between the land surface and atmosphere in eleven different ecosystems types in Sub-Saharan Africa, as measured using eddy covariance (EC) technology in the first two years of the CarboAfrica network operation. The ecosystems for which data were available ranged in mean annual rainfall from 320 mm (Sudan)...
Conference Paper
The Surface Energy Balance Algorithm for Land (SEBAL) is a widely accepted and valid method to model actual evapotranspiration (ETact). This study focuses on impacts of different preprocessing routines and different sensor data on SEBAL output data. The model was applied to scenes contemporaneously recorded by ASTER and MODIS. Two input parameters,...
Article
Full-text available
Savannas cover large areas of the Earth's surface and play an important role in global carbon cycling. West Africa is dominated by a variety of savanna ecosystems; however, they have been poorly studied up to now. In the present study, energy and carbon dioxide exchange was measured over a 2-year period using the eddy covariance technique at a sout...
Article
Full-text available
In a combined field and laboratory study in the southwest of Burkina Faso, we quantified soil-atmosphere N2O and NO exchange. N2O emissions were measured during two field campaigns throughout the growing seasons 2005 and 2006 at five different experimental sites, that is, a natural savanna site and four agricultural sites planted with sorghum (n =...
Article
An one-dimensional process-based SVAT model (Mixfor-SVAT) was developed to describe energy, water and carbon dioxide exchanges between vegetation canopy and the atmosphere at a local scale. Simulation of the energy, water and CO2 fluxes in Mixfor-SVAT is based on aggregated description of the physical and biological processes on the leaf, tree (pla...
Conference Paper
Thermal and optical remote sensing data with the Surface Energy Balance Algorithm for Land (SEBAL) provide an appropriate basis for modelling energy fluxes at regional scale. This study compares SEBAL applied to ASTER data with in-situ-measurements. The results, especially those based on data corrected for atmospheric influences found close agreeme...
Article
Full-text available
Copyright: Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. This study reports carbon and water fluxes between the land surface and atmosphere in eleven different ecosystems types in Sub-Saharan Africa, as measured using eddy covariance (EC) technology in the first two years of the CarboAfrica network ope...
Article
The Surface Energy Balance Algorithm for Land (SEBAL) is being used worldwide for the estimation of latent heat fluxes from MODIS and Landsat images. Our study objective is to investigate how large aperture scintillometers can be best employed for the validation of SEBAL heat fluxes. In this study, Landsat and MODIS images of the Valles Caldera Nat...
Article
Tropical savannahs cover an area of 17 x 106 km2 worldwide. Their role in the global greenhouse gas budget still remains uncertain. In the past large parts of the former native African savannahs have been converted to agricultural land. To contribute to evaluating greenhouse gas exchange of tropical savannah ecosystems, especially in sub- Saharan A...
Chapter
Full-text available
Greenhouse gas and energy fluxes between the land surface and the atmosphere are important aspects for the evaluation of land-use options in tropical areas. Changes in vegetation cover alter the capacity to absorb carbon dioxide and solar radiation from the atmosphere and influence the magnitudes of latent and sensible heat flows to the atmosphere....
Chapter
Greenhouse gas and energy fluxes between the land surface and the atmosphere are important aspects for the evaluation of land-use options in tropical areas. Changes in vegetation cover alter the capacity to absorb carbon dioxide and solar radiation from the atmosphere and influence the magnitudes of latent and sensible heat flows to the atmosphere....
Article
Full-text available
Rapid conversion of tropical rainforests to agricultural land-use types occurs throughout Indonesia and SouthEast Asia. We hypothesize that these changes in land-use affect the turbulent heat exchange processes between vegetation and the atmosphere, and the radiative properties of the surface, and therefore, induce an impact on local climate and wa...
Article
Full-text available
The investigation of interactions between biosphere and atmosphere of the major land use types of the tropical rain forest margin area in South East Asia and quantification of the impact that land use change from undisturbed primary rain forest to pasture has on these interactions is task of subprogramme B1 within the DFG-funded project STORMA (Sta...
Article
The regional pattern of energy and water fluxes in an heterogeneous mountainous area of Central Sulawesi covered by tropical rain forests were quantified using a regional SVAT (Soil-Vegetation-Atmosphere-Transfer) model "SVAT-Regio" within the frameworks of the bilateral German-Indonesian project "The stability of rainforest margins in Indonesia"....
Article
The conversion of tropical rain forest to agriculturally used land is a widespread process throughout Indonesia. Besides the effects on the biological diversity and the hydrological functions of a forest, this also has an impact on the turbulent exchange processes between vegetation and atmosphere, the radiative properties of the surface and theref...
Article
Full-text available
Surface winds and energy fluxes from measurements of stations on the ice sheet and in the tundra area near Kangerlussuaq, West Greenland, are presented for the period of the experiment KABEG (Katabatic wind and boundary layer front experiment around Greenland) in April/May 1997. For almost all days a nighttime development of the katabatic wind is f...
Article
Surface winds and energy fluxes from measurements of stations on the ice sheet and in the tundra area ne ar Kangerlussuaq, West Greenland, are presented for the period of the experiment KABEG (Katabatic wind and boundary layer front experiment around Greenland) in April/May 1997. For alm ost all days a nighttime development of the katabatic wind is...

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Projects (3)
Archived project
Project
energy balance on glaciers, glaciological modelling with ogg (http://oggm.readthedocs.io/en/latest/)