A5054145718- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Geological Studies and Exploration
- Underwater Acoustics Research
- Seismic Waves and Analysis
- Atmospheric and Environmental Gas Dynamics
- Biochemical and Molecular Research
- Glutathione Transferases and Polymorphisms
- Redox biology and oxidative stress
- Parasites and Host Interactions
- Marine and environmental studies
- Parasite Biology and Host Interactions
- Coastal and Marine Dynamics
- Geophysics and Gravity Measurements
- Icing and De-icing Technologies
- Amino Acid Enzymes and Metabolism
- Neonatal Health and Biochemistry
- Marine and coastal ecosystems
- Gold and Silver Nanoparticles Synthesis and Applications
- Tropical and Extratropical Cyclones Research
Woods Hole Oceanographic Institution
2022-2025
University of Washington Applied Physics Laboratory
2016-2024
Loyola University Chicago
2021-2024
University of Washington
2016-2022
Johns Hopkins University Applied Physics Laboratory
2021-2022
Northwestern University
2017
State University of New York at Potsdam
2017
Seattle University
2016
Facility for Airborne Atmospheric Measurements
2013
Radar (United States)
1983
Year-round observations of the physical snow and ice properties processes that govern pack evolution its interaction with atmosphere ocean were conducted during Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) expedition research vessel Polarstern in Ocean from October 2019 to September 2020. This work was embedded into interdisciplinary design 5 MOSAiC teams, studying atmosphere, sea ice, ocean, ecosystem, biogeochemical processes. The overall aim characterize cover...
The magnitude, spectral composition, and variability of the Arctic sea ice surface albedo are key to understanding numerically simulating Earth’s shortwave energy budget. Spectral broadband albedos were spatially temporally sampled by on-ice observers along individual survey lines throughout sunlit season (April–September, 2020) during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. seasonal evolution MOSAiC year was constructed from averaged values each line....
Melt ponds on sea ice play an important role in the Arctic climate system. Their presence alters partitioning of solar radiation: decreasing reflection, increasing absorption and transmission to ocean, enhancing melt. The spatiotemporal properties melt thus modify albedo feedbacks mass balance ice. Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition presented a valuable opportunity investigate seasonal evolution through rich array atmosphere-ice-ocean measurements...
Abstract A large collaborative program has studied the coupled air‐ice‐ocean‐wave processes occurring in Arctic during autumn ice advance. The included a field campaign western of 2015, with situ data collection and both aerial satellite remote sensing. Many analyses have focused on using improving forecast models. Summarizing synthesizing results from series separate papers, overall view is an shifting to more seasonal system. dramatic increase open water extent duration means that surface...
Abstract This paper presents a wave‐in‐ice model calibration study. Data used were collected in the thin ice of advancing autumn marginal zone western Arctic Ocean 2015, where pancake was found to be prevalent. Multiple buoys deployed seven wave experiments; data from four these experiments are present Wave attenuation coefficients calculated utilizing energy decay between two measuring simultaneously within covered region. Wavenumbers measured one experiments. Forcing parameters obtained...
During the Arctic melt season, relatively fresh meltwater layers can accumulate under sea ice as a result of snow and melt, far from terrestrial freshwater inputs. Such under-ice layers, sometimes referred to ponds, have been suggested play role in summer mass balance both by isolating saltier water below, driving formation ‘false bottoms’ below ice. form at interface fresher layer colder, seawater below. Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition Central...
The rapid melt of snow and sea ice during the Arctic summer provides a significant source low-salinity meltwater to surface ocean on local scale. accumulation this on, under, around floes can result in relatively thin layers upper ocean. Due small-scale nature these upper-ocean features, typically order 1 m thick or less, they are rarely detected by standard methods, but nevertheless pervasive critically important summer. Observations Multidisciplinary drifting Observatory for Study Climate...
Abstract Quantifying the rate of wave attenuation in sea ice is key to understanding trends Antarctic marginal zone extent. However, a paucity observations waves limits progress on this front. We deployed 14 waves-in-ice observation systems (WIIOS) during Polynyas, Ice Production, and seasonal Evolution Ross Sea expedition (PIPERS) 2017. The WIIOS provide situ measurement surface characteristics. Two experiments were conducted, one while ship was inbound outbound. throughout generally...
Abstract The dissipation of wave energy in the marginal ice zone is often attributed to scattering and dissipative mechanisms associated with layer. In this study we present observations indicating that turbulence generated by differential velocity between sea cover orbital motion may be an important mechanism energy. Through field measurements under‐ice rates pancake frazil ice, it shown turbulence‐induced attenuation coefficients are agreement observed zone. results suggest can...
Abstract. Katabatic winds in coastal polynyas expose the ocean to extreme heat loss, causing intense sea ice production and dense water formation around Antarctica throughout autumn winter. The advancing pack, combined with high low temperatures, has limited surface observations of winter, thereby impeding new insights into evolution these factories through dark austral months. Here, we describe oceanic during multiple katabatic wind events May 2017 Terra Nova Bay Ross Sea polynyas. Wind...
The microstructure of the uppermost portions a melting Arctic sea ice cover has disproportionately large influence on how incident sunlight is reflected and absorbed in ice/ocean system. surface scattering layer (SSL) effectively backscatters solar radiation keeps albedo relatively high compared to with SSL manually removed. Measurements provide information incoming shortwave partitioned by have been pivotal improving climate model parameterizations. However, relationship between physical...
Leads play an important role in the exchange of heat, gases, vapour, and particles between seawater atmosphere ice-covered polar oceans. In summer, these processes can be modified significantly by formation a meltwater layer at surface, yet we know little about dynamics persistence. During drift campaign Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC), examined how variation lead width, re-freezing, mixing events affected vertical structure waters during late summer...
Abstract This study presents Arctic sea ice drift fields measured by shipboard marine X‐band radar (MR). The measurements are based on the maximum cross correlation between two sequential MR backscatter images separated ∼1 min in time, a method that is commonly used to estimate from satellite products. advantage of close temporal proximity readily available. A typical antenna rotation period ∼1–2 s, whereas revisit times can be order days. technique applied ∼4 weeks taken R/V Sikuliaq...
Abstract A storm with significant wave heights exceeding 4 m occurred in the Beaufort Sea on 11–13 October 2015. The waves and ice were captured 12 by Synthetic Aperture Radar (SAR) board Sentinel‐1A, Interferometric Wide swath images covering 400 × 1,100 km at 10 resolution. This data set allows estimation of spectra across marginal zone (MIZ) every 5 km, over sea ice. Since attenuates wavelengths shorter than 50 a few kilometers, longer are clearly imaged SAR Obtaining from image requires...
Abstract High‐resolution measurements of the air‐ice‐ocean system during an October 2015 event in Beaufort Sea demonstrate how stored ocean heat can be released to temporarily reverse seasonal ice advance. Strong on‐ice winds over a vast fetch caused mixing and release from upper ocean. This was sufficient melt large areas thin, newly formed pancake ice; average 10 MJ/m 2 lost study area, resulting ∼3–5 cm sea melt. Heat salt budgets create consistent picture evolving this event, both fixed...
Abstract The Ross Sea is known for showing the greatest sea-ice increase, as observed globally, particularly from 1979 to 2015. However, corresponding changes in thickness and production are not known, nor how these have impacted water masses, carbon fluxes, biogeochemical processes availability of micronutrients. PIPERS project sought address questions during an autumn ship campaign 2017 two spring airborne campaigns 2016 2017. used a multidisciplinary approach manned autonomous platforms...
Unprecedented quantities of heat are entering the Pacific sector Arctic Ocean through Bering Strait, particularly during summer months. Though some is lost to atmosphere autumn cooling, a significant fraction incoming warm, salty water subducts (dives beneath) below cooler fresher layer near-surface water, subsequently extending hundreds kilometers into Beaufort Gyre. Upward turbulent mixing these sub-surface pockets likely accelerating sea ice melt in region. This Pacific-origin brings both...
Abstract This study isolates the influence of sea ice mean state on pre‐industrial climate and transient 1850–2100 change within a fully coupled global model: The Community Earth System Model version 2 (CESM2). CESM2 model physics is modified to increase surface albedo, reduce melt, Arctic thickness late summer cover. Importantly, increased in reduces present‐day late‐summer cover bias. Of interest development, this bias reduction realized without degrading simulation including...
The retreat of Arctic sea ice is enabling increased ocean wave activity at the edge, yet interactions between surface waves and are not fully understood. Here, we examine in situ observations spectra spanning 2012–2021 western marginal zone (MIZ). Swells exceeding 30 cm rarely observed beyond 100 km inside MIZ. However, local wind patches open water amid partial cover during summer. These remain fetch-limited floes with heights less than 1 m. To investigate these climate scales, conduct...
Abstract Snow plays an essential role in the Arctic as interface between sea ice and atmosphere. Optical properties, thermal conductivity mass distribution are critical to understanding complex system’s energy balance distribution. By conducting measurements from October 2019 September 2020 on Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition, we have produced a dataset capturing year-long evolution physical properties snow surface scattering layer, highly...
Abstract New sea ice in the polar regions often begins as small pancake floes autumn and winter that grow laterally weld together into larger floes. However, conditions oceans during freezeup are harsh, rendering situ observations of small‐scale growth processes difficult infrequent. Here we apply image processing techniques to images obtained by drifting wave buoys (SWIFTs) deployed Arctic Ocean quantify these for first time. Small were observed form gradually freezing, low‐wave conditions....
Errors in intravenous (IV) drug therapies can cause human harm and even death. There are limited label-free methods that sensitively monitor the identity quantity of being administered. Normal Raman spectroscopy (NRS) provides a modestly sensitive, label-free, completely noninvasive means IV sensing. In case analyte cannot be detected within its clinical range with Raman, surface-enhanced (SERS) approach implemented to detect interest. this work, we demonstrate two individual cases where use...
Abstract The rapidly changing Arctic sea ice cover affects surface wave growth across all scales. Here, in situ measurements of waves, observed from freely-drifting buoys during the 2014 open water season, are interpreted using distances determined satellite products and wind forcing time series measured with buoys. A significant portion observations were found to be limited by distance (fetch) when duration was sufficient for conditions considered stationary. scaling energy frequency...
Accurate multidecadal radiative flux records are vital to understand Arctic amplification and constrain climate model uncertainties. Uncertainty in the NASA Clouds Earth’s Radiant Energy System (CERES)-derived irradiances is larger over sea ice than any other surface type comes from several sources. The year-long Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition central provides a rare opportunity explore uncertainty CERES-derived fluxes. First, systematic...