Publications

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2026

Seasonal to decadal evolution of firn properties and impacts on hydrology of the Juneau Icefield

Alpine glaciers of Alaska are significant contributors to global sea-level rise. Most Alaskan glaciers lose mass through surface melt …
DOI

HydroFirn: A numerical model for large-scale multidimensional firn hydrology

Observations show the multidimensional dynamics of meltwater and distribution of ice layers in the firn on the Greenland Ice Sheet. …
DOI

A data assimilation framework for improving greenland ice sheet surface mass balance using simulated gridded ICESat-2 elevation change data

Abstract The ongoing melting of the Greenland ice sheet (GrIS) is a major contributor to global sea-level rise. Accurately quantifying …
DOI

Albedo Data Assimilation Improves Surface Mass Balance Estimates of the Greenland Ice Sheet

Uncovering the relationship between climate and firn characteristics on mountain glaciers

A single instrument approach to ice flow, surface mass balance, and firn compaction validation in central Greenland

2024

Direct measurements of firn-density evolution from 2016 to 2022 at Wolverine Glacier, Alaska

Knowledge of snow and firn-density change is needed to use elevation-change measurements to estimate glacier mass change. Additionally, …
DOI

A physics-based Antarctic melt detection technique: combining Advanced Microwave Scanning Radiometer 2, radiative-transfer modeling, and firn modeling

Surface melt on ice shelves has been linked to hydrofracture and subsequent ice shelf breakup. Since the 1990s, scientists have been …
DOI

Firn on ice sheets

Most of the Greenland and Antarctic ice sheets are covered with firn — the transitional material between snow and glacial ice. Firn is …
DOI

2023

Role of Snowfall Versus Air Temperatures for Greenland Ice Sheet Melt‐Albedo Feedbacks

Abstract The Greenland Ice Sheet is a leading contributor to global sea‐level rise because climate warming has enhanced surface …
DOI

A new model of dry firn-densification constrained by continuous strain measurements near South Pole

Converting measurements of ice-sheet surface elevation change to mass change requires measurements of accumulation and knowledge of the …
DOI

An evaluation of a physics-based firn model and a semi-empirical firn model across the Greenland Ice Sheet (1980–2020)

The Greenland Ice Sheet’s (GrIS) firn layer buffers the ice sheet’s contribution to sea level rise by storing meltwater in …
DOI

Seasonal temperatures in West Antarctica during the Holocene

The recovery of long-term climate proxy records with seasonal resolution is rare because of natural smoothing processes, …
DOI

2022

Simulations of firn processes over the Greenland and Antarctic ice sheets: 1980–2021

Conversion of altimetry-derived ice-sheet volume change to mass requires an understanding of the evolution of the combined ice and air …
DOI

The Greenland Firn Compaction Verification and Reconnaissance (FirnCover) dataset, 2013–2019

Assessing changes in the density of snow and firn is vital to convert volume changes into mass changes on glaciers and ice sheets. Firn …
DOI

2021

Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method

Abstract Data from the South Pole ice core (SPC14) are used to constrain climate conditions and ice‐flow‐induced layer thinning for the …
DOI

Numerical experiments on firn isotope diffusion with the Community Firn Model

Abstract Advances in analytical methods have made it possible to obtain high-resolution water isotopic data from ice cores. Their …
DOI

Uncertainty in East Antarctic Firn Thickness Constrained Using a Model Ensemble Approach

Abstract Mass balance assessments of the East Antarctic ice sheet (EAIS) are highly sensitive to changes in firn thickness, causing …
DOI

Effect of horizontal divergence on estimates of firn-air content

Ice-sheet mass-balance estimates derived from repeat satellite-altimetry observations require accurate calculation of spatiotemporal …
DOI

2020

Greenland Ice Sheet Elevation Change: Direct Observation of Process and Attribution at Summit

Abstract Greenland Ice Sheet surface elevation is changing as mass loss accelerates. In understanding elevation change, the magnitudes …
DOI

The firn meltwater Retention Model Intercomparison Project (RetMIP): evaluation of nine firn models at four weather station sites on the Greenland ice sheet

Perennial snow, or firn, covers 80 % of the Greenland ice sheet and has the capacity to retain surface meltwater, influencing the ice …
DOI

Bayesian calibration of firn densification models

Abstract. Firn densification modelling is key to understanding ice sheet mass balance, ice sheet surface elevation change, and the age …
DOI

The Community Firn Model (CFM) v1.0

Abstract. Models that simulate the evolution of polar firn are important for several applications in glaciology, including converting …
DOI

Firn cold content evolution at nine sites on the Greenland ice sheet between 1998 and 2017

Abstract Current sea-level rise partly stems from increased surface melting and meltwater runoff from the Greenland ice sheet. …
DOI

High-frequency climate variability in the Holocene from a coastal-dome ice core in east-central Greenland

Abstract. An ice core drilled on the Renland ice cap in east-central Greenland contains a continuous climate record dating through the …
DOI

Advection and non-climate impacts on the South Pole Ice Core

Abstract. The South Pole Ice Core (SPICEcore), which spans the past 54 300 years, was drilled far from an ice divide such that ice …
DOI

Relating regional and point measurements of accumulation in southwest Greenland

Abstract. In recent decades, the Greenland ice sheet (GrIS) has frequently experienced record melt events, which have significantly …
DOI

2019

Rapid expansion of Greenland’s low-permeability ice slabs

DOI

Development of physically based liquid water schemes for Greenland firn-densification models

As surface melt is increasing on the Greenland Ice Sheet (GrIS), quantifying the retention capacity of the firn layer is critical to …
DOI

Firn data compilation reveals widespread decrease of firn air content in western Greenland

Abstract. A porous layer of multi-year snow known as firn covers the Greenland-ice-sheet interior. The firn layer buffers the ice-sheet …
DOI

2018

Holocene Ice‐Flow Speedup in the Vicinity of the South Pole

DOI

2017

GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica

Abstract. In the last 2 decades, Pine Island Glacier (PIG) experienced marked speedup, thinning, and grounding-line retreat, likely due …
DOI

Firn Model Intercomparison Experiment (FirnMICE)

ABSTRACT Evolution of cold dry snow and firn plays important roles in glaciology; however, the physical formulation of a densification …
DOI

Inferring Firn Permeability from Pneumatic Testing: A Case Study on the Greenland Ice Sheet

DOI