Alexander Gruber
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View article: Intercomparison of Earth Observation products for hyper-resolution hydrological modelling over Europe
Intercomparison of Earth Observation products for hyper-resolution hydrological modelling over Europe Open
View article: Comment on egusphere-2025-4225
Comment on egusphere-2025-4225 Open
View article: The Importance of Scale in the Definition of Uncertainties: How do we Best Communicate this to Data Users?
The Importance of Scale in the Definition of Uncertainties: How do we Best Communicate this to Data Users? Open
Climate services often require observational climate data to inform decision-making on mitigation and adaptation activities. Understanding the uncertainties in the climate datasets that are used for this purpose, and how these uncertaintie…
View article: A Practical Introduction to Utilising Uncertainty Information in the Analysis of Essential Climate Variables
A Practical Introduction to Utilising Uncertainty Information in the Analysis of Essential Climate Variables Open
An estimate of uncertainty is essential to understanding what information is conveyed by data and how it relates to the wider context of what one intended to measure. It can be difficult to know how to use uncertainty during the analysis o…
View article: Accounting for seasonal retrieval errors in the merging of multi-sensor satellite soil moisture products
Accounting for seasonal retrieval errors in the merging of multi-sensor satellite soil moisture products Open
View article: Making Sense of Uncertainties: Ask the Right Question
Making Sense of Uncertainties: Ask the Right Question Open
Earth observation data should inform decision making, but good decisions can only be made if the uncertainties in the data are taken into account. Making sense of uncertainty information can be difficult, because uncertainties represent th…
View article: A Sentinel-1 SAR-based global 1-km resolution soil moisture data product: Algorithm and preliminary assessment
A Sentinel-1 SAR-based global 1-km resolution soil moisture data product: Algorithm and preliminary assessment Open
High spatial resolution of satellite-based soil moisture (SM) data are essential for hydrological, meteorological, ecological, and agricultural studies. Especially, for watershed hydrological simulation and crop water stress analysis, 1-km…
View article: The Applicability of Categorical Triple Collocation in Spatiotemporal Two-Dimensional Merging of Soil Freeze-Thaw Products
The Applicability of Categorical Triple Collocation in Spatiotemporal Two-Dimensional Merging of Soil Freeze-Thaw Products Open
View article: Fiducial Reference Measurements for Soil Moisture (FRM4SM) Executive Summary Report
Fiducial Reference Measurements for Soil Moisture (FRM4SM) Executive Summary Report Open
This is the executive summary report of the Fiducial Reference Measurements for Soil Moisture (FRM4SM) project, which was carried out by Angewandte Wissenschaft, Software und Technologie GmbH (AWST),Technische Universität Wien (TU Wien), a…
View article: Global Climate
Global Climate Open
Two night marine air temperature (NMAT) datasets are routinely updated and used for analysis in this section: UAHNMAT (Junod and Christy 2020) and CLASSnmat (Cornes et al. 2020). These datasets are evaluated in combination with the HadSST4…
View article: Estimating the uncertainties of satellite derived soil moisture at global scale
Estimating the uncertainties of satellite derived soil moisture at global scale Open
View article: 45 years of global satellite soil moisture for hydrological and climate applications
45 years of global satellite soil moisture for hydrological and climate applications Open
ESA CCI Soil Moisture (SM) is a long-term global Climate Data Record of water content stored in the surface soil layer, derived from satellite observations in the microwave domain. To make it suitable for long-term analyses in climate and …
View article: A gap-filled global long-term satellite soil moisture climate data record from ESA CCI SM
A gap-filled global long-term satellite soil moisture climate data record from ESA CCI SM Open
ESA CCI Soil Moisture is a multi-satellite climate data record that consists of harmonized, daily observations coming at present from 19 satellites operating in the microwave domain. The wealth of satellite information, particularly over t…
View article: Using fiducial reference measurements for assessing soil moisture product stability
Using fiducial reference measurements for assessing soil moisture product stability Open
The Global Climate Observing System Essential Climate Variables (GCOS ECVs) requirements define a target threshold of 0.005 m³/m³ per decade for satellite soil moisture product stability. As admitted by GCOS, this threshold lacks…
View article: What is the uncertainty of the uncertainty and (why) does it matter?  Propagating uncertainties of weight estimates through soil moisture data merging
What is the uncertainty of the uncertainty and (why) does it matter?  Propagating uncertainties of weight estimates through soil moisture data merging Open
This study aims to improve the ESA CCI soil moisture dataset uncertainty estimates by including the sampling uncertainty of the triple collocation analysis in the uncertainty propagation of the data merging scheme. The ESA CCI soil moistur…
View article: Fiducial Reference Measurements for Soil Moisture (FRM4SM): recent progress in error source identification and traceable uncertainty budget calculation
Fiducial Reference Measurements for Soil Moisture (FRM4SM): recent progress in error source identification and traceable uncertainty budget calculation Open
In situ soil moisture data is used as the main reference for the validation of satellite soil moisture products. Although in situ measurements are often referred to as the “ground truth” and we have an understanding of th…
View article: Quality Assurance for Soil Moisture (QA4SM): A Platform for Validating Satellite Soil Moisture Data Against Fiducial Reference Measurements
Quality Assurance for Soil Moisture (QA4SM): A Platform for Validating Satellite Soil Moisture Data Against Fiducial Reference Measurements Open
The purpose of the Quality Assurance for Soil Moisture (QA4SM) service is to provide a central, cloud-based platform for soil moisture data validation. QA4SM is an easy-to-use graphical web interface that caters to both producers of satell…
View article: Assessment of SMOS soil moisture considering the heterogeneity of geophysical parameters within the footprint
Assessment of SMOS soil moisture considering the heterogeneity of geophysical parameters within the footprint Open
Evaluating the uncertainties of satellite soil moisture (as SMOS or SMAP) is crucial for enhancing our comprehension of climate mechanisms, such as the water cycle or the energy balance. The commonly used method is to evaluate the agreemen…
View article: Global Scale Mapping of Subsurface Scattering Signals Impacting ASCAT Soil Moisture Retrievals
Global Scale Mapping of Subsurface Scattering Signals Impacting ASCAT Soil Moisture Retrievals Open
Soil moisture retrievals from the Advanced Scatterometer (ASCAT) have so far relied on the assumption that soil backscatter increases monotonically with soil moisture content. However, under dry soil conditions, discontinuities in the soil…
View article: Drought and Waterlogging Stress Regimes in Northern Peatlands Detected Through Satellite Retrieved Solar‐Induced Chlorophyll Fluorescence
Drought and Waterlogging Stress Regimes in Northern Peatlands Detected Through Satellite Retrieved Solar‐Induced Chlorophyll Fluorescence Open
The water table depth (WTD) in peatlands determines the soil carbon decomposition rate and influences vegetation growth, hence the above‐ground carbon assimilation. Here, we used satellite‐observed Solar‐Induced chlorophyll Fluorescence (S…
View article: Assimilation of Sentinel-1 Backscatter into a Land Surface Model with River Routing and Its Impact on Streamflow Simulations in Two Belgian Catchments
Assimilation of Sentinel-1 Backscatter into a Land Surface Model with River Routing and Its Impact on Streamflow Simulations in Two Belgian Catchments Open
Accurate streamflow simulations rely on good estimates of the catchment-scale soil moisture distribution. Here, we evaluated the potential of Sentinel-1 backscatter data assimilation (DA) to improve soil moisture and streamflow estimates. …
View article: Global Climate
Global Climate Open
Air temperature measurements have been made onboard ships for centuries and continue to be collected today thanks to the Voluntary Observing Ship initiative (https://www.ocean-ops.org/reportcard2022/). Gridded datasets of marine air temper…
View article: Global Scale Mapping of Subsurface Scattering Signals Impacting ASCAT Soil Moisture Retrievals
Global Scale Mapping of Subsurface Scattering Signals Impacting ASCAT Soil Moisture Retrievals Open
Microwave pulses can penetrate several centimeters to decimeters into dry soils. As a result, active microwave sensors are sensitive to discontinuities in the soil profile caused by the presence of stones, rocks or distinct soil layers. Su…
View article: Uncertainty estimation for a new exponential-filter-based long-term root-zone soil moisture dataset from Copernicus Climate Change Service (C3S) surface observations
Uncertainty estimation for a new exponential-filter-based long-term root-zone soil moisture dataset from Copernicus Climate Change Service (C3S) surface observations Open
Soil moisture is a key variable in monitoring climate and an important component of the hydrological, carbon, and energy cycles. Satellite products ameliorate the sparsity of field measurements but are inherently limited to observing the n…
View article: Global Scale Mapping of Subsurface Scattering Signals Impacting ASCAT Soil Moisture Retrievals
Global Scale Mapping of Subsurface Scattering Signals Impacting ASCAT Soil Moisture Retrievals Open
Microwave pulses can penetrate several centimeters to decimeters into dry soils. As a result, active microwave sensors are sensitive to discontinuities in the soil profile caused by the presence of stones, rocks or distinct soil layers. Su…
View article: Comment on egusphere-2023-47
Comment on egusphere-2023-47 Open
Abstract. Soil moisture is a key variable in monitoring climate and an important component of the hydrological, carbon, and energy cycles. Satellite products ameliorate the sparsity of field measurements but are inherently…
View article: Comment on egusphere-2023-47
Comment on egusphere-2023-47 Open
Abstract. Soil moisture is a key variable in monitoring climate and an important component of the hydrological, carbon, and energy cycles. Satellite products ameliorate the sparsity of field measurements but are inherently…
View article: Impact of Design Factors for ESA CCI Satellite Soil Moisture Data Assimilation over Europe
Impact of Design Factors for ESA CCI Satellite Soil Moisture Data Assimilation over Europe Open
In this study, soil moisture retrievals of the combined active–passive ESA Climate Change Initiative (CCI) soil moisture product are assimilated into the Noah-MP land surface model over Europe using a one-dimensional ensemble Kalman filter…
View article: Uncertainty estimation for a new exponential filter-based long-term root-zone soil moisture dataset from C3S surface observations
Uncertainty estimation for a new exponential filter-based long-term root-zone soil moisture dataset from C3S surface observations Open
Soil moisture is a key variable in monitoring climate and an important component of the hydrological, carbon, and energy cycles. Satellite products ameliorate the sparsity of field measurements but are inherently limited to observing the n…
View article: QA4SM: a service for transparent and reproducible evaluation of satellite soil moisture products
QA4SM: a service for transparent and reproducible evaluation of satellite soil moisture products Open
Quality assessment is an integral part of creating climate data records. Producers of satellite based records want to evaluate whether their products fulfill certain quality requirements, such as the ones set by the Global Climate Observin…