A. Parsekian
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View article: Annual dynamics of Arctic lake ice pressure ridge formation in Teshekpuk Lake, Alaska
Annual dynamics of Arctic lake ice pressure ridge formation in Teshekpuk Lake, Alaska Open
Lake ice pressure ridges are compression ruptures that typically form due to large air temperature variations, occurring mostly on large lakes in cold environments such as the Arctic tundra and boreal regions. Quantifying pressure ridge oc…
View article: A novel apparatus for studying fish cognition in the wild
A novel apparatus for studying fish cognition in the wild Open
Fish show a huge variation of ecological, anatomical and behavioural traits, which makes them prime subjects for studying behaviour, cognition and their evolution. Lab‐based studies allow a controlled examination of some of the mechanisms …
View article: Permafrost Dynamics Observatory: 3. Remote Sensing Big Data for the Active Layer, Soil Moisture, and Greening and Browning
Permafrost Dynamics Observatory: 3. Remote Sensing Big Data for the Active Layer, Soil Moisture, and Greening and Browning Open
Because of the remote nature of permafrost, it is difficult to collect data over large geographic regions using ground surveys. Remote sensing enables us to study permafrost at high resolution and over large areas. The Arctic‐Boreal Vulner…
View article: Characterization of non-Gaussianity in the snow distributions of various landscapes
Characterization of non-Gaussianity in the snow distributions of various landscapes Open
Seasonal snowpack is an important predictor of the water resources available in the following spring and early-summer melt season. Total basin snow water equivalent (SWE) estimation usually requires a form of statistical analysis that is i…
View article: Machine Learning‐Based Hydrofacies Classification: Effects of Noise and Regularization
Machine Learning‐Based Hydrofacies Classification: Effects of Noise and Regularization Open
This study utilizes an unsupervised ML approach, the expectation‐maximization (EM) algorithm using Gaussian Mixture Models (GMM), to integrate near‐surface geophysics measurements for hydrofacies classification. We examined the impact of n…
View article: Comment on egusphere-2024-395
Comment on egusphere-2024-395 Open
Abstract. Seasonal snowpack is an important predictor of available water resources in the following spring and early summer melt season. Total basin snow water equivalent (SWE) estimation usually requires a form of statistical analysis tha…
View article: The ABoVE L-band and P-band airborne synthetic aperture radar surveys
The ABoVE L-band and P-band airborne synthetic aperture radar surveys Open
Permafrost-affected ecosystems of the Arctic–boreal zone in northwestern North America are undergoing profound transformation due to rapid climate change. NASA's Arctic Boreal Vulnerability Experiment (ABoVE) is investigating characteristi…
View article: Characterization of Non-Gaussianity in the Snow Distributions of Various Landscapes
Characterization of Non-Gaussianity in the Snow Distributions of Various Landscapes Open
Seasonal snowpack is an important predictor of available water resources in the following spring and early summer melt season. Total basin snow water equivalent (SWE) estimation usually requires a form of statistical analysis that is impli…
View article: Sims et al. A Tale of Two Pools: The Dynamic Influence of Subsurface Geological Processes on the Assembly and Diversification of Thermophilic Microbial Communities in Hydrothermal Systems - Supplementary Datasets
Sims et al. A Tale of Two Pools: The Dynamic Influence of Subsurface Geological Processes on the Assembly and Diversification of Thermophilic Microbial Communities in Hydrothermal Systems - Supplementary Datasets Open
These datasets comprise the supplementary datasets found in Sims et al. A Tale of Two Pools: The Dynamic Influence of Subsurface Geological Processes on the Assembly and Diversification of Thermophilic Microbial Communities in Hydrothermal…
View article: Observations from an Expedition to Costa Rican Peatlands
Observations from an Expedition to Costa Rican Peatlands Open
In July and August of 2023, we visited Costa Rica to examine some of the country’s peatlands. The purpose of our trip was to collect peat samples from a variety of wetland habitats from the coast to the highlands for future analysis. We su…
View article: Sims et al. A Tale of Two Pools: The Dynamic Influence of Subsurface Geological Processes on the Assembly and Diversification of Thermophilic Microbial Communities in Hydrothermal Systems - Supplementary Datasets
Sims et al. A Tale of Two Pools: The Dynamic Influence of Subsurface Geological Processes on the Assembly and Diversification of Thermophilic Microbial Communities in Hydrothermal Systems - Supplementary Datasets Open
These datasets comprise the supplementary datasets found in Sims et al. A Tale of Two Pools: The Dynamic Influence of Subsurface Geological Processes on the Assembly and Diversification of Thermophilic Microbial Communities in Hydrothermal…
View article: Rapid Saline Permafrost Thaw Below a Shallow Thermokarst Lake in Arctic Alaska
Rapid Saline Permafrost Thaw Below a Shallow Thermokarst Lake in Arctic Alaska Open
Permafrost warming and degradation is well documented across the Arctic. However, observation‐ and model‐based studies typically consider thaw to occur at 0°C, neglecting the widespread occurrence of saline permafrost in coastal plain regi…
View article: Comment on essd-2021-172
Comment on essd-2021-172 Open
Abstract. Permafrost-affected ecosystems of the Arctic-boreal zone in northwestern North America are undergoing profound transformation as a result of rapid climate change. NASA’s Arctic Boreal Vulnerability Experiment (ABoVE) is investiga…
View article: The ABoVE L-band and P-band Airborne SAR Surveys
The ABoVE L-band and P-band Airborne SAR Surveys Open
Permafrost-affected ecosystems of the Arctic-boreal zone in northwestern North America are undergoing profound transformation as a result of rapid climate change. NASA’s Arctic Boreal Vulnerability Experiment (ABoVE) is investigating chara…
View article: Ecohydrologic Dynamics of Rock Moisture in a Montane Catchment of the Colorado Front Range
Ecohydrologic Dynamics of Rock Moisture in a Montane Catchment of the Colorado Front Range Open
Warming across the western United States continues to reduce snowpack, lengthen growing seasons, and increase atmospheric demand, leading to uncertainty about moisture availability in montane forests. As many upland forests have thin soils…
View article: A Comparison of Hydrological and Geophysical Calibration Data in Layered Hydrologic Models of Mountain Hillslopes
A Comparison of Hydrological and Geophysical Calibration Data in Layered Hydrologic Models of Mountain Hillslopes Open
Both hydrological and geophysical data can be used to calibrate hillslope hydrologic models. However, these data often reflect hydrological dynamics occurring at disparate spatial scales. Their use as sole objectives in model calibrations …
View article: Permafrost Dynamics Observatory (PDO): 2. Joint Retrieval of Permafrost Active Layer Thickness and Soil Moisture From L‐Band InSAR and P‐Band PolSAR
Permafrost Dynamics Observatory (PDO): 2. Joint Retrieval of Permafrost Active Layer Thickness and Soil Moisture From L‐Band InSAR and P‐Band PolSAR Open
Seasonal subsidence induced by ground ice melt can be measured by interferometric synthetic aperture radar (InSAR) techniques to infer active layer thickness (ALT) in permafrost regions. The magnitude of subsidence depends on both how deep…
View article: A new Stefan equation to characterize the evolution of thermokarst lake and talik geometry
A new Stefan equation to characterize the evolution of thermokarst lake and talik geometry Open
Thermokarst lake dynamics, which play an essential role in carbon release due to permafrost thaw, are affected by various geomorphological processes. In this study, we derive a three-dimensional (3D) Stefan equation to characterize talik g…
View article: Comment on hess-2021-520
Comment on hess-2021-520 Open
Abstract. Hillslope similarity is an active topic in hydrology because of its importance in improving our understanding of hydrologic processes and enabling comparisons and paired studies. In this study, we propose a holistic bottom-up hil…
View article: Spatial snowdrift modelling for an open natural terrain using a physically‐based linear particle distribution equation
Spatial snowdrift modelling for an open natural terrain using a physically‐based linear particle distribution equation Open
Snowdrift, which results from deposition of wind transported snow, has been primarily estimated empirically rather than using physically‐based modelling since the snow redistribution process is extremely complex. This study demonstrates a …
View article: Comment on tc-2021-192
Comment on tc-2021-192 Open
Abstract. Thermokarst lake dynamics, which play an essential role in carbon release due to permafrost thaw, are affected by various geomorphological processes. In this study, we derive a three-dimensional (3D) Stefan equation to characteri…
View article: Comment on tc-2021-192
Comment on tc-2021-192 Open
Abstract. Thermokarst lake dynamics, which play an essential role in carbon release due to permafrost thaw, are affected by various geomorphological processes. In this study, we derive a three-dimensional (3D) Stefan equation to characteri…
View article: Three-Dimensional Stefan Equation for Thermokarst Lake and Talik Geometry Characterization
Three-Dimensional Stefan Equation for Thermokarst Lake and Talik Geometry Characterization Open
Thermokarst lake dynamics, which plays an essential role in carbon release due to permafrost thaw, is affected by various geomorphological processes. In this study, we derive a three-dimensional (3D) Stefan equation to characterize talik g…
View article: Validation of Permafrost Active Layer Estimates from Airborne SAR Observations
Validation of Permafrost Active Layer Estimates from Airborne SAR Observations Open
In permafrost regions, active layer thickness (ALT) observations measure the effects of climate change and predict hydrologic and elemental cycling. Often, ALT is measured through direct ground-based measurements. Recently, synthetic apert…
View article: Remote Sensing-Based Statistical Approach for Defining Drained Lake Basins in a Continuous Permafrost Region, North Slope of Alaska
Remote Sensing-Based Statistical Approach for Defining Drained Lake Basins in a Continuous Permafrost Region, North Slope of Alaska Open
Lake formation and drainage are pervasive phenomena in permafrost regions. Drained lake basins (DLBs) are often the most common landforms in lowland permafrost regions in the Arctic (50% to 75% of the landscape). However, detailed assessme…
View article: Permafrost Dynamics Observatory—Part I: Postprocessing and Calibration Methods of UAVSAR L‐Band InSAR Data for Seasonal Subsidence Estimation
Permafrost Dynamics Observatory—Part I: Postprocessing and Calibration Methods of UAVSAR L‐Band InSAR Data for Seasonal Subsidence Estimation Open
Interferometric synthetic aperture radar (InSAR) has been used to quantify a range of surface and near surface physical properties in permafrost landscapes. Most previous InSAR studies have utilized spaceborne InSAR platforms, but InSAR da…