Stefan Hendricks
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Drift-aware sea ice thickness maps from satellite remote sensing Open
The standard approach to deriving gridded sea ice thickness (SIT) from satellite altimeters is to aggregate the original along-track SIT estimates over a 1-month period to achieve sufficient coverage across the Arctic. However, this approa…
View article: Towards representation learning of radar altimeter waveforms for sea ice surface classification
Towards representation learning of radar altimeter waveforms for sea ice surface classification Open
Satellite radar altimeters provide crucial insights into polar oceans and their sea ice cover, enabling the estimation of sea level, sea ice freeboard, and thickness. These retrieval algorithms depend on accurate discrimination between rad…
Drift-aware sea ice thickness maps from satellite remote sensing Open
The standard approach to derive gridded sea ice thickness (SIT) is to aggregate the original along-track estimates from satellite altimeters over a one-month period. However, this approach neglects processes like sea ice advection, deforma…
View article: Smoother sea ice with fewer pressure ridges in a more dynamic Arctic
Smoother sea ice with fewer pressure ridges in a more dynamic Arctic Open
Pressure ridges, formed by sea ice deformation, affect momentum transfer in the Arctic Ocean and support a larger biomass than the surrounding-level ice. Although trends in Arctic sea ice thickness and concentration are well documented, ch…
View article: Dual-hemisphere sea ice thickness reference measurements from multiple data sources for evaluation and product inter-comparison of satellite altimetry
Dual-hemisphere sea ice thickness reference measurements from multiple data sources for evaluation and product inter-comparison of satellite altimetry Open
Sea ice altimetry currently remains the primary method for estimating sea ice thickness from space, however time-series of sea ice thickness estimates are of limited use without having been quality-controlled against reference measurements…
Improved sub-ice platelet layer mapping with multi-frequency EM induction sounding Open
In Antarctica, sub-ice platelet layers (SIPL) accumulate beneath sea ice where ice crystals emerge from adjacent ice shelf cavities, serving as a unique habitat and indicator of ice-ocean interaction. Atka Bay in the eastern Weddell Sea, c…
SMOS-derived Antarctic thin sea ice thickness: data description and validation in the Weddell Sea Open
Accurate satellite measurements of the thickness of Antarctic sea ice are urgently needed but pose a particular challenge. The Antarctic data presented here were produced using a method to derive the sea ice thickness from 1.4 GHz brightne…
View article: Lead fractions from SAR-derived sea ice divergence during MOSAiC
Lead fractions from SAR-derived sea ice divergence during MOSAiC Open
Leads and fractures in sea ice play a crucial role in the heat and gas exchange between the ocean and atmosphere, impacting atmospheric, ecological, and oceanic processes. We estimated lead fractions from high-resolution divergence obtaine…
View article: Arctic sea ice freeboard during summer – a new Cryo-TEMPO product
Arctic sea ice freeboard during summer – a new Cryo-TEMPO product Open
Arctic sea ice thickness impacts various physical and biogeochemical processes at the air-ice-ocean interface. For example, it determines how much sunlight reaches the base of the ice – a key parameter for primary production. It is also an…
Comprehensive assessment of sea-ice thickness datasets: The ESA SIN’XS project Open
Sea-ice thickness is a crucial parameter for a variety of scientific disciplines, including climate science, oceanography, and ecology. It plays a vital role in regulating exchanges of heat, moisture and momentum between the polar oceans a…
A Practical Approach to FMCW Radar Deconvolution in the Sea Ice Domain Open
This paper presents a practical step-by-step approach to Frequency Modulated Continuous\nWave (FMCW) radar nonlinearity correction (deconvolution), utilizing surface-based Ku- and Ka-band radar\ndata collected over nilas ice within a newly…
Comment on essd-2023-326 Open
Abstract. Accurate satellite measurements of the thickness of Antarctic sea ice are urgently needed but pose a particular challenge. The Antarctic data presented here were produced using a method to derive the sea-ice thickness from 1.4 GH…
Digital elevation models of the sea-ice surface from airborne laser scanning during MOSAiC Open
Airborne laser scanners (ALS) are used to map the sea-ice surface at sub-meter resolution. We conducted 64 flights over the Arctic sea ice between September 2019 and September 2020 during the Multidisciplinary drifting Observatory for the …
View article: Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry
Retrieval of Snow Depth on Arctic Sea Ice From Surface‐Based, Polarimetric, Dual‐Frequency Radar Altimetry Open
Snow depth on sea ice is an Essential Climate Variable and a major source of uncertainty in satellite altimetry‐derived sea ice thickness. During winter of the MOSAiC Expedition, the “KuKa” dual‐frequency, fully polarized Ku‐ and Ka‐band r…
SMOS-derived Antarctic thin sea-ice thickness: data description and validation in the Weddell Sea Open
Accurate satellite measurements of the thickness of Antarctic sea ice are urgently needed but pose a particular challenge. The Antarctic data presented here were produced using a method to derive the sea-ice thickness from 1.4 GHz brightne…
View article: The Arctic
The Arctic Open
Rapid warming due to human-caused climate change is reshaping the Arctic, enhanced by physical processes that cause the Arctic to warm more quickly than the global average, collectively called Arctic amplification. Observations over the pa…
View article: Lead fractions from SAR-derived sea ice divergence during MOSAiC
Lead fractions from SAR-derived sea ice divergence during MOSAiC Open
Leads and fractures in sea ice play a crucial role in the heat and gas exchange between the ocean and atmosphere, impacting atmospheric, ecological, and oceanic processes. Our aim was to estimate lead fractions from high-resolution diverge…
View article: Wind redistribution of snow impacts the Ka- and Ku-band radar signatures of Arctic sea ice
Wind redistribution of snow impacts the Ka- and Ku-band radar signatures of Arctic sea ice Open
Wind-driven redistribution of snow on sea ice alters its topography and microstructure, yet the impact of these processes on radar signatures is poorly understood. Here, we examine the effects of snow redistribution over Arctic sea ice on …
View article: Heat stored in the Earth system 1960–2020: where does the energy go?
Heat stored in the Earth system 1960–2020: where does the energy go? Open
The Earth climate system is out of energy balance, and heat has accumulated continuously over the past decades, warming the ocean, the land, the cryosphere, and the atmosphere. According to the Sixth Assessment Report by Working Group I of…
High resolution maps of the sub-ice platelet layer in Atka Bay from electromagnetic induction sounding Open
We present maps of the sub-ice platelet layer (SIPL) thickness and ice volume fraction beneath the land-fast sea ice in Atka Bay adjacent to the Ekström Ice Shelf (southeastern Weddell Sea, Antarctica). The widespread SIPL beneath Antarcti…
Monitoring Arctic thin ice: a comparison between CryoSat-2 SAR altimetry data and MODIS thermal-infrared imagery Open
Areas of thin sea ice in the polar regions not only are experiencing the highest rate of sea-ice production but also are, therefore, important hot spots for ocean ventilation as well as heat and moisture exchange between the ocean and the …
Product User Guide & Algorithm Specification: AWI CryoSat-2 Sea Ice Thickness (version 2.5) Open
This document provides an overview of all aspects of the CryoSat-2 Arctic sea-ice thickness data product (version 2.5) generated at the Alfred Wegener Institute Helmholtz Center for Polar and Marine Research (AWI). It contains information …
View article: A comparison between Envisat and ICESat sea ice thickness in the Southern Ocean
A comparison between Envisat and ICESat sea ice thickness in the Southern Ocean Open
The crucial role that Antarctic sea ice plays in the global climate system is strongly linked to its thickness. While field observations are too sparse in the Southern Ocean to determine long-term trends of the Antarctic sea ice thickness …
Rain on snow (ROS) understudied in sea ice remote sensing: a multi-sensor analysis of ROS during MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) Open
Arctic rain on snow (ROS) deposits liquid water onto existing snowpacks. Upon refreezing, this can form icy crusts at the surface or within the snowpack. By altering radar backscatter and microwave emissivity, ROS over sea ice can influenc…
View article: Comment on essd-2022-239
Comment on essd-2022-239 Open
Abstract. The Earth climate system is out of energy balance and heat has accumulated continuously over the past decades, warming the ocean, the land, the cryosphere and the atmosphere. According to the 6th Assessment Report of the Intergov…
View article: Heat stored in the Earth system 1960–2020: Where does the energy go?
Heat stored in the Earth system 1960–2020: Where does the energy go? Open
The Earth climate system is out of energy balance and heat has accumulated continuously over the past decades, warming the ocean, the land, the cryosphere and the atmosphere. According to the 6th Assessment Report of the Intergovernmental …