Jürgen Kusche

Jürgen Kusche
University of Bonn | Uni Bonn

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286
Publications
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5,668
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Publications

Publications (286)
Article
Soil hydrological processes (SHP) support ecosystems, modulate the impact of climate change on terrestrial systems and control feedback mechanisms between water, energy and biogeochemical cycles. However, land-use changes and extreme events are increasingly impacting these processes. In this Review, we describe SHP across scales and examine their l...
Article
The availability of freshwater is highly influenced by climate change, extreme climate events and by anthropogenic use. Countries where a large part of the population depends on the agricultural sector, such as South Africa, are strongly affected by changes in climate, which emphasizes that water is an essential source for food production and drink...
Presentation
Full-text available
This presentation shows interesting results of performance comparison between 2 coastal retracker (ALES and X-TRACK/ALES) with reference data (CMEMS) and Tide Gauges on Indonesian Seas. It indicates that while both coastal retracker are more precise and have bigger correlation coefficient index than the reference data, the reference data has a bett...
Preprint
Neutral thermospheric density is an essential quantity required for precise orbit determination of satellites, collision avoidance of satellites, re-entry prediction of satellites or space debris, and satellite lifetime assessments. Empirical models of the thermosphere fail to provide sufficient estimates of neutral thermospheric density along the...
Preprint
We apply state-of-the-art computational geometry methods to the problem of reconstructing a time-varying sea surface from tide gauge records. Our work builds on a recent article by Nitzke et al.~(Computers \& Geosciences, 157:104920, 2021) who have suggested to learn a triangulation $D$ of a given set of tide gauge stations. The objective is to min...
Article
Full-text available
In December 2019, the latest generation transportable superconducting gravimeter (SG) iGrav-043 purchased by the University of Bonn was installed in the Walferdange Underground Laboratory for Geodynamics (WULG) in the Grand Duchy of Luxembourg. In this paper, we estimate the calibration factor of the iGrav-043, which is essential for long-term grav...
Preprint
Full-text available
The availability of freshwater is highly influenced by climate change, extreme climate events and by anthropogenic use. Countries where a large part of the population depends on the agricultural sector, such as South Africa, are strongly affected by changes in climate, which emphasizes that water is an essential source for food production and drink...
Article
Full-text available
The regular drought episodes in South Africa highlight the need to reduce drought risk by both policy and local community actions. Environmental and socioeconomic factors in South Africa's agricultural system have been affected by drought in the past, creating cascading pressures on the nation's agro-economic and water supply systems. Therefore, un...
Article
Full-text available
A major problem in the precise orbit determination (POD) of satellites at altitudes below 1,000 km is the modeling of the aerodynamic drag which mainly depends on the thermospheric density and causes the largest non‐gravitational acceleration. Typically, empirical thermosphere models are used to calculate density values at satellite positions but c...
Article
Full-text available
The current state‐of‐the‐art of satellite gravity data processing makes use of de‐aliasing products to reduce high‐frequency mass anomalies. For example, the most recent official Atmosphere and Ocean De‐aliasing products (AOD1B‐RL06) are applied for the Gravity Recovery and Climate Experiment (GRACE) and GRACE‐Follow On (GRACE‐FO) missions. The tem...
Article
Reconstructions of sea level prior to the satellite altimeter era are usually derived from tide gauge records; however most algorithms for this assume that modes of sea level variability are stationary which is not true over several decades. Here we suggest a method that is based on optimized data-dependent triangulations of the network of gauge st...
Article
Full-text available
Observations of changes in terrestrial water storage (TWS) obtained from the satellite mission GRACE (Gravity Recovery and Climate Experiment) have frequently been used for water cycle studies and for the improvement of hydrological models by means of calibration and data assimilation. However, due to a low spatial resolution of the gravity field m...
Article
Full-text available
Plain Language Summary Since 2002, temporal changes of vertically integrated water storage have been detected globally with unprecedented accuracy via satellite gravimetry, as first implemented with the Gravity Recovery and Climate Experiment (GRACE) satellites. However, no similar observation system has been in place before 2002, that could have u...
Preprint
Full-text available
The availability of in-situ neutral and electron densities along the orbit of the satellite missions GRACE and CHAMP provide a good opportunity to study the ionosphere-thermosphere (IT) system. The aim of this paper is (1) to use these data sets, to study the IT density relation empirically via correlation properties for different conditions depend...
Article
The GRACE and GRACE-FO missions have provided an unprecedented quantification of large-scale changes in the water cycle. However, it is still an open problem of how these missions’ data can be referenced to a ground truth. Meanwhile, stationary optical clocks show fractional instabilities below 10−18 when averaged over an hour, and continue to be i...
Article
Full-text available
The Gravity Recovery and Climate Experiment (GRACE) mission has enabled mass changes and transports in the hydrosphere, cryosphere and oceans to be quantified with unprecedented resolution. However, while this legacy is currently being continued with the GRACE Follow-On (GRACE-FO) mission there is a gap of 11 months between the end of GRACE and the...
Article
Full-text available
Mass transport estimates based on filtered GRACE monthly spherical harmonic gravity field solutions generally suffer from resolution loss and signal attenuation. To develop high-resolution solutions from GRACE Level-1B data, this paper proposes a new regularization method. Transforming spatial constraints from GRACE-based filtered mass changes into...
Article
Full-text available
A new approach to recover time-variable gravity fields from satellite laser ranging (SLR) is presented. It takes up the concept of lumped coefficients by representing the temporal changes of the Earth’s gravity field by spatial patterns via combinations of spherical harmonics. These patterns are derived from the GRACE mission by decomposing the ser...
Preprint
Full-text available
The GRACE and GRACE-FO missions have provided an unprecedented quantification of large-scale changes in the water cycle. However, it is still an open problem of how these missions' data sets can be referenced to a ground truth. Meanwhile, stationary optical clocks show fractional instabilities below $10^{-18}$ when averaged over an hour, and contin...
Preprint
Full-text available
Observations of changes in terrestrial water storage obtained from the satellite mission GRACE (Gravity Recovery and Climate Experiment) have frequently been used for water cycle studies and for the improvement of hydrological models by means of calibration and data assimilation. However, due to a low spatial resolution of the gravity field models...
Article
Full-text available
Plain Language Summary Billions of people across the globe have been in lockdown in response to the coronavirus disease 2019 (COVID‐19) pandemic. Mobility restriction in municipalities has left many public parking lots deserted. The absence of motor vehicles in parking lots during this unusual time can give us some insights into impact of nonstatio...
Preprint
Full-text available
Reconstructions of sea level prior to the satellite altimeter era are usually derived from tide gauge records; however most algorithms for this assume that modes of sea level variability are stationary which is not true over several decades. Here we suggest a method that is based on optimized data-dependent triangulations of the network of gauge st...
Preprint
Data dependent triangulations are triangulations of point sets in the plane that are computed under consideration not only of the points' $x$- and $y$-coordinates but also of additional data (e.g., elevation). In particular, min-error criteria have been suggested to compute triangulations that approximate a given surface. In this article, we show h...
Article
New in this work is a new analytical derivation of a Delay-Doppler map model for Fully-Focused SAR, which includes the vertical wave particle motion and a more general surface representation. It was indeed already noticed in Egido and Smith (2017) that the open ocean surfaces decorrelate within the integration time interval, which is used in the FF...
Article
Full-text available
Plain Language Summary Sea level change is influenced by vertical motion of the sea surface as well as vertical motion of the land in coastal areas. Tide gauges and GPS are two conventional approaches to measure coastal vertical land motion (VLM). GPS conventional positioning determines the vertical component of position changes resulting from disp...
Article
Full-text available
Limited by the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) measurement principle and sensors, the spatial resolution of mass flux solutions is about 2–3° in mid-latitudes at monthly intervals. To retrieve a mass flux solution in the Tibetan Plateau (TP) with better visual spatial resolution, we combined truncated...
Poster
Investigation of systematic errors in GRACE temporal gravity field solutions using the Improved Energy Balance Approach
Article
Full-text available
The Gravity Recovery and Climate Experiment (GRACE) mission ended its operation in October 2017 and the GRACE Follow-On mission was launched only in May 2018, leading to approximately one year of data gap. Given that GRACE-type observations are exclusively providing direct estimates of Total Water Storage Change (TWSC), it would be very important t...
Article
Full-text available
For low Earth orbit (LEO) satellites, activities such as precise orbit determination, gravity field retrieval, and thermospheric density estimation from accelerometry require modeled accelerations due to radiation pressure. To overcome inconsistencies and better understand the propagation of modeling errors into estimates, we here suggest to extend...
Conference Paper
Full-text available
Drought is a recurrent global phenomenon considered one of the most complex hazards with manifold impacts on communities, ecosystems, and economies. While many sectors are affected by drought, agriculture's high dependency on water makes it particularly susceptible to droughts, threatening the livelihoods of many, and hampering the achievement of t...
Article
Full-text available
Droughts continue to affect ecosystems, communities and entire economies. Agriculture bears much of the impact, and in many countries it is the most heavily affected sector. Over the past decades, efforts have been made to assess drought risk at different spatial scales. Here, we present for the first time an integrated assessment of drought risk f...
Article
Full-text available
Identifying and quantifying drought in retrospective is a necessity for better understanding drought conditions and the propagation of drought through the hydrological cycle and eventually for developing forecast systems. Hydrological droughts refer to water deficits in surface and subsurface storage, and since these are difficult to monitor at lar...
Article
Full-text available
Observations of changes in terrestrial water storage obtained from the satellite mission GRACE (Gravity Recovery and Climate Experiment) have frequently been used for water cycle studies and for the improvement of hydrological models by means of calibration and data assimilation. However, due to a low spatial resolution of the gravity field models...
Article
Full-text available
The Niger River represents a challenging target for deriving discharge from spaceborne radar altimeter measurements, particularly since most terrestrial gauges ceased to provide data during the 2000s. Here, we propose deriving altimetric rating curves by “bridging” gaps between time series from gauge and altimeter measurements using hydrological mo...
Article
Loading deformations from atmospheric, oceanic, and hydrological mass changes mask geophysical processes such as land subsidence and tectonic or volcanic deformation. While it is known that hydrological loading plays a role at seasonal time scales, here we demonstrate evidence that also fast water storage changes contribute to daily Global Position...
Presentation
Die Auswertung mit unterschiedlicher GNSS-Software kann bei GNSS-Positionszeitreihen zu RMS-Abweichungen von einigen mm und zu systematischen periodischen Differenzen führen. Je nach Anwendung können diese Software- beziehungsweise auswertebedingten Unsicherheiten relevant sein. Am Beispiel von GNSS-Positionszeitreihen in der New Madrid Seismic Zon...
Article
Full-text available
Droughts continue to affect ecosystems, communities, and entire economies. Agriculture bears much of the impact, and in many countries it is the most heavily affected sector. Over the past decades, efforts have been made to assess drought risk at different spatial scales. Here, we present for the first time an integrated assessment of drought risk...
Article
Full-text available
We reassess the absolute and relative sea level changes at 38 tide gauge stations in the earthquake-affected Western North Pacific for the 1993-2015 period, focusing on the vertical land motion (VLM) which is crucial for narrowing the gap between these estimates. In this area, simply discarding all earthquake-affected sites, one overestimates the a...
Article
By convention the absolute bias in sea surface height (SSH) is the difference between the altimeter and the in-situ reference SSH heights above the Earth ellipsoid. Both the absolute and the relative bias of the CryoSat-2 and Sentinel-3A missions are derived in this study at four stations along the German coasts. Firstly, the coastal data processe...
Article
Full-text available
Identifying and quantifying drought in retrospective is a necessity for better understanding drought conditions and the propagation of drought through the hydrological cycle, and eventually for developing forecast systems. Hydrological droughts refer to water deficits in surface and subsurface storage, and since these are difficult to monitor at la...
Poster
The New Madrid Seismic Zone is an active seismic zone in the Midwestern United States. While in most parts of the continental US seismic activity increased in the last decade largely due to wastewater injections in context with oil and gas production, for the New Madrid Seismic Zone seismicity has been suggested to be related to hydrological loadin...
Conference Paper
Full-text available
In times of drought, water resources are insufficient. These water shortages often have negative effects on agricultural productivity and on associated socioeconomic factors, causing reduced income, food shortages and even famines. The overall objective of GlobeDrought is to develop an integrated drought risk information system which will adequatel...
Article
Full-text available
Accurate estimates of ocean mass change are necessary to infer steric sea level change from sea level changes measured with satellite altimeters. Published studies using the Gravity Recovery and Climate Experiment (GRACE) satellite mission indicated a large range in trends (∼1–2 mm/year) with reported standard errors of 0.1–0.3 mm/year. Here we sho...
Article
Full-text available
The Niger river represents a challenging target for deriving discharge from spaceborne radar altimeter measurements, in particular since most terrestrial gauges ceased to provide data during the 2000s. Here, we propose to derive altimetric rating curves by bridging gaps between time series from gauge and altimeter measurements using hydrological mo...
Presentation
Die Erdbebenaktivität im kontinentalen Inneren der USA hat im letzten Jahrzehnt drastisch zugenommen. Die New Madrid Seismic Zone (NMSZ) ist die am stärksten seismisch aktive Region in den Vereinigten Staaten und befindet sich in der nördlichen Mississippi Region. In den Jahren 1811 und 1812 ereigneten sich dort drei große Erdbeben mit einer Magnit...
Article
From June 2009 to September 2014, ten stations of the International Laser Ranging Service acquired more than 5000 h of one-way ranging data to NASA’s Lunar Reconnaissance Orbiter (LRO). The LRO campaign was intended to support the determination of precise science orbits for which S-band Doppler and range measurements are the primary source. The las...
Article
Full-text available
Ultra-sensitive space-borne accelerometers on board of low Earth orbit (LEO) satellites are used to measure non-gravitational forces acting on the surface of these satellites. These forces consist of the Earth radiation pressure, the solar radiation pressure and the atmospheric drag, where the first two are caused by the radiation emitted from the...
Article
Full-text available
During the last few decades, decomposition techniques have found increasing application for dimension reduction as well as exploring information from geophysical time series. Traditionally, the principal component analysis (PCA)/ empirical orthogonal function (EOF) method, and more recently independent component analysis (ICA) has been applied to e...
Article
Full-text available
Hydrologically‐induced deformation of Earth's surface can be measured with high precision geodetic techniques, which in turn can be used to study the underlying hydrologic process. For geodetic study of other Earth processes such as tectonic and volcanic deformation, or coastal subsidence and its relation to relative sea‐level rise and flood risk,...
Article
Full-text available
Predicting freshwater resources is a major concern in West Africa, where large parts of the population depend on rain-fed subsistence agriculture. However, a steady decline in the availability of in-situ measurements of climatic and hydrologic variables makes it difficult to simulate water resource availability with hydrological models. In this stu...