Oskar Glowacki

Oskar Glowacki
Institute of Geophysics, Polish Academy of Sciences · Polar and Marine Research

PhD
A researcher studying glacier-ocean interactions with cryoacoustics, photogrammetry and other tools.

About

39
Publications
4,544
Reads
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190
Citations
Citations since 2016
23 Research Items
169 Citations
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2016201720182019202020212022010203040
Additional affiliations
December 2020 - present
Institute of Geophysics, Polish Academy of Sciences
Position
  • Professor (Assistant)
May 2018 - November 2020
University of California, San Diego
Position
  • PostDoc Position
June 2017 - May 2018
Institute of Geophysics, Polish Academy of Sciences
Position
  • Professor (Assistant)
Education
October 2012 - April 2017
Institute of Geophysics, Polish Academy of Sciences
Field of study
  • Geophysics
October 2010 - July 2012
University of Gdansk
Field of study
  • Marine Physics
October 2007 - July 2010
University of Gdansk
Field of study
  • Physical Oceanography with Geoinformatics

Publications

Publications (39)
Article
Full-text available
The temporal variability of the moments of prob-ability distribution functions (pdfs) of total sea ice defor-mation rates in the Arctic is analyzed in the context of the basin-scale wind forcing acting on the ice. The pdfs are es-timated for 594 satellite-derived sea ice deformation maps from 11 winter seasons between 1996/1997 and 2007/2008, provi...
Article
Full-text available
Climate-driven ice-water interactions in the contact zone between marine-terminating glaciers and the ocean surface show a dynamic and complex nature. Tidewater glaciers lose volume through the poorly-understood process of calving. A detailed description of the mechanisms controlling the course of calving is essential for the reliable estimation an...
Article
Ambient noise oceanography is proving to be an efficient and effective tool for the study of ice-ocean interactions in the bays of marine-terminating glaciers. However, obtaining quantitative estimates of ice melting or calving processes from ambient noise requires an understanding of how sound propagation through the bay attenuates and filters the...
Article
Full-text available
Freshwater fluxes from melting icebergs and glaciers are important contributors to both sea level rise and anomalies of seawater salinity in polar regions. However, the hazards encountered close to icebergs and glaciers make it difficult to quantify their melt rates directly, motivating the development of cryoacoustics as a remote sensing technique...
Article
Full-text available
Accurate estimates of calving fluxes are essential in understanding small-scale glacier dynamics and quantifying the contribution of marine-terminating glaciers to both eustatic sea-level rise (SLR) and the freshwater budget of polar regions. Here we investigate the application of acoustical oceanography to measure calving flux using the underwater...
Article
Full-text available
Iceberg calving is one of the major mechanisms of ice loss from tidewater glaciers and ice sheets, but obtaining accurate estimates of ice discharge that are both continuous and accurate is a challenging task. Recent results have demonstrated the effective application of passive cryoacoustics – the use of naturally generated sounds to study the cry...
Article
Glacier ice loss impacts sound propagation within Arctic fjords. Regular calving events contribute to a collection of floating ice fragments, known as brash ice, at the ocean surface that obstruct the natural and anthropogenic acoustic signals, yet are difficult to characterize. Transmission loss measurements using a maximum length sequence ( m-seq...
Article
No PDF available ABSTRACT Ice sheets are expected to be major contributors to sea level rise in the coming decades and centuries. Ocean-forced melting at marine terminating glaciers has the potential to be an important driver of mass loss from these ice sheets, but is difficult to measure directly using conventional techniques, and thus remains poo...
Article
No PDF available ABSTRACT Climate-change induced melting is leading to accelerating ice loss at tidewater glaciers worldwide. A significant component of the freshwater flux from these glaciers arises from submarine melting at the glacier-ocean interface. This melting causes a distinct acoustic signature due to the release of pressurized bubbles und...
Conference Paper
Full-text available
No PDF available ABSTRACT Marine-terminating glaciers worldwide are melting rapidly in response to climate shifts, resulting in the delivery of freshwater into the oceans. Submarine melting at the glacier-water interface accounts for a significant component of the freshwater delivery from the glacier. This melting produces a distinct acoustic signa...
Conference Paper
Full-text available
No PDF available ABSTRACT Melting glaciers and ice sheets are important contributors to sea level rise, but the rates at which they are losing mass are difficult to measure precisely. Using the acoustic signals produced by the rapid release of pressurized air from bubbles contained in the ice is a promising avenue for obtaining quantitative estimat...
Article
Arctic glacial bays are among the loudest natural environments in the ocean, owing to heavy submarine melting, calving, freshwater discharge, and ice–wave interactions. Understanding the coherence and vertical directionality of the ambient sound there can provide insights about the mechanisms behind the ice loss in these regions. It can also provid...
Article
Measurement of the geometry of marine-terminating glaciers is challenging due to the lack of stable ground areas in close proximity to the glacier. This precludes the use of fixed measuring devices and restricts the placement of ground control points. We propose a measurement procedure for marine-terminating glaciers using structure-from-motion inc...
Article
Full-text available
The underwater noise emission from glacier calving is investigated by integrating acoustic and photographic observations made in a glacial bay and model pool. Similarities in the impact noise in these two settings are identified. Distinct fluid-dynamics processes are involved in sound generation: iceberg detachment, water entry, entrainment and col...
Preprint
Full-text available
Accurate estimates of calving fluxes are essential to understand small-scale glacier dynamics and quantify the 10 contribution of marine-terminating glaciers to both eustatic sea level rise and the freshwater budget of polar regions. Here we investigate the application of ambient noise oceanography to measure calving flux using the underwater sound...
Article
Transmission loss measurements were conducted in the meltwater-modified surface layer near Hansbreen Glacier in Hornsund Fjord in southwestern Svalbard in September 2017 [Deane and Glowacki, JASA 143, 1711 (2018)]. An m-sequence source signal (149 dB re 1 μPa, 11 kHz carrier frequency) was tethered at 7 m depth to a boat drifting from 0 to 200 m. T...
Conference Paper
Transmission loss measurements were conducted in the meltwater-modified surface layer near Hansbreen Glacier in Hornsund Fjord in southwestern Svalbard in September 2017 [Deane and Glowacki, JASA 143, 1711 (2018)]. An ITC-1007 (International Transducer Corporation) source emitting an m-sequence signal (149 dB re 1 µPa, 11 kHz carrier frequency) was...
Article
Full-text available
Tidewater glaciers supply large amounts of suspended particulate matter (SPM) and freshwater to fjords and affect oceanographic, sedimentological and biological processes. Our understanding of these processes, is usually limited to the short summer season. Here, we present the results of a one-year-long monitoring of the spatial variability in SPM...
Article
Measurements of the vertical directionality of the sound of bubbles released explosively from a melting glacier terminus are presented. These data are motivated by a desire to infer ice melt rates using the sound generated by bubbles, trapped in the glacier ice at the base of the fern layer and pressurized over time, as they are released by the mel...
Article
Marine-terminating glaciers are retreating at an unprecedented pace, largely as a result of enhanced submarine melting. However, studying ice-ocean interactions is complicated due to both harsh conditions prevailing in glacial bays and lack of scientific methods enabling continuous measurements. Recent studies have shown that high underwater noise...
Article
A propagation experiment was undertaken in the meltwater-modified surface layer in the bay of a marine-terminating Arctic glacier. Broad-band, m-sequence transmissions were made with an International Transducer Corporation 1007 source deployed from a drifting boat tracked using gps, approximately 500 m in front of Hansbreen Glacier in Hornsund Fjor...
Article
Recent acceleration of sea ice decline observed in the Arctic Ocean draws attention to environmental factors driving this phenomenon. One of the main conclusions is a growing need for better understanding of sea ice drift, deformation, and fracturing. In response to that call, several ambient noise recordings were carried out in the coastal zone of...
Article
Full-text available
Glacierized fjords are dynamic regions, with variable oceanographic conditions and complex ice−ocean interactions, which are still poorly understood. Recent studies have shown that passive underwater acoustics offers new promising tools in this branch of polar research. Here, we present results from two field campaigns, conducted in summer 2013 and...
Article
Full-text available
Glacierized fjords are dynamic regions, with variable oceanographic conditions and complex ice-ocean interactions, which are still poorly understood. Recent studies have shown that passive underwater acoustics offers new promising tools in this branch of polar research. Here, we present results from two field campaigns, conducted in summer 2013 and...
Chapter
Field tests were carried out at a section of the River Vistula located within the boundaries of the Świderskie Islands nature reserve in order to analyse bathymetric changes at different discharge values during the period of 2012–2014. The paper shows that the dynamics and transport of sand-waves and sandbanks strongly influence the bathymetry of t...
Conference Paper
Full-text available
Progressive climate shifts are particularly pronounced in the Polar Regions, including glacial fjords and bays. Many different tools are now widely used to investigate the rate of glaciers’ movement, intensity of calving events and subglacial freshwater outflows or changes in an ice concentration at the sea surface. However, harsh polar conditions...
Article
Full-text available
The directionality of ambient noise in an Arctic tidewater glacier bay was measured using two horizontally spaced, broadband hydrophones. Segments of noise were divided into two frequency bands and analyzed for arrival angle. These data show that different classes of source radiate noise in distinct spectral bands and are spatially diverse. A previ...
Chapter
Full-text available
Arctic and Southern Oceans are extremely noisy places. Various geophysical and biological processes generate underwater sounds at different frequencies. Using spectral, wavelet and statistical analysis, it becomes possible to distinguish almost all individual phenomena. This allows the assessment of, among other things, the rainfall intensity, vari...
Data
The boundary between marine-terminating glaciers and the ocean is subject to rapidly changing environmental conditions. Calving events are responsible for the production of drifting icebergs and, as a result of melting, provide significant amounts of freshwater to the global ocean, also contribute to sea level rise. Therefore, the rate and scale of...
Conference Paper
Full-text available
According to the most recent studies, a steady and consistent increase in the underwater noise level is observed in the Arctic fjords. This phenomenon is mainly caused by intense melting of tidewater glaciers and other associated effects. An important component of the underwater sound budget is the noise generated by gas bubbles escaping from melti...
Conference Paper
Full-text available
Ocean-ice boundaries in the Arctic are dynamic regions that are receiving increasing attention as sensitive indicators of shifts in climate. Recently, there has been interest in using measurements of the underwater ambient noise in the fjords of marine-terminating glaciers as a new tool to monitor and study glacier dynamics. There already exist man...
Article
Observational data show that deformation of the compact sea ice covering the central Arctic takes place within elongated, narrow zones separating semi-rigid floes. Localization of deformation, and a related intermittent character of internal stress in the ice, cannot be satisfactorily reproduced with present state-of-the-art numerical models, espec...

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Cited By

Projects

Projects (3)
Project
The project aims to complete two major research tasks: 1. to get new insight into the mechanical loss of ice from tidewater glaciers (‘calving’) using a multi-sensor approach and 2. to transform passive acoustics into a practical tool for the long-term monitoring of calving fluxes and calving styles. This research is funded by the National Science Centre (Poland) - award no 2021/43/D/ST10/00616.
Project
The project aims to better understand the relationship between sea-ice bahavior and related underwater ambient noise. It is focused on a shallow coastal areas, where sea-ice protects the coast from destructive influence of wave erosion. The resistance of the 'ice shield' depends on a variety of sea-ice properties, like its type, thickness and coverage. Interactions between sea-ice and external forces, including wind, tides and waves, depend on these parameters. Together with changing scenarios, there are changes in underwater soundscape. And these changes can be investigated with the use of ambient noise oceanography. Research supported by Polish National Science Centre, project no. 2013/11/N/ST10/01729
Project
Quantify ice melting and glacier calving from observations of underwater ambient noise in Arctic glacial bays.