A5044086192- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Climate variability and models
- Geology and Paleoclimatology Research
- Distributed and Parallel Computing Systems
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- semigroups and automata theory
- Water resources management and optimization
- Sensor Technology and Measurement Systems
- Atmospheric and Environmental Gas Dynamics
- Algorithms and Data Compression
- Hydrology and Watershed Management Studies
- Geological formations and processes
- Geological Studies and Exploration
- Marine and environmental studies
- Parallel Computing and Optimization Techniques
- Service-Oriented Architecture and Web Services
- Hydrology and Drought Analysis
- Software System Performance and Reliability
- Industrial Automation and Control Systems
- Mathematics, Computing, and Information Processing
- Advanced Software Engineering Methodologies
Victor Chang Cardiac Research Institute
1996-2025
St Vincent's Clinic
2022
UNSW Sydney
2022
University of Strathclyde
2021-2022
Met Office
2021
Norwegian Polar Institute
2017-2020
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2016-2017
Stockholm University
2012-2015
Bolin Centre for Climate Research
2013-2015
University of East Anglia
2012
Abstract Here we evaluate five atmospheric reanalyses in an Arctic gateway during late summer. The include ERA5, ERA‐Interim, Japanese 55 year Re‐Analysis (JRA‐55), Climate Forecasting System Reanalysis‐version 2 (CFSv2), and Modern Era Retrospective analysis for Research Applications‐version (MERRA‐2). We use observations from 50 radiosondes launched the Fram Strait around 79‐80°N, between 25 August 11 September 2017. Crucially, data 27 were not transmitted to Global Telecommunications...
Abstract. Rapid changes are occurring in the Arctic, including a reduction sea ice thickness and coverage shift towards younger thinner ice. Snow models often used to study these ongoing typically forced by atmospheric reanalyses absence of observations. ERA5 is new global reanalysis that will replace widely ERA-Interim (ERA-I). In this study, we compare 2 m air temperature (T2M), snowfall (SF) total precipitation (TP) from ERA-I ERA5, evaluate products using buoy observations Arctic for...
Abstract This study evaluates the performance of six atmospheric reanalyses (ERA-Interim, ERA5, JRA-55, CFSv2, MERRA-2, and ASRv2) over Arctic sea ice from winter to early summer. The are evaluated using observations Norwegian Young Sea Ice campaign (N-ICE2015), a 5-month drift in pack north Svalbard. N-ICE2015 include surface meteorology, vertical profiles radiosondes, as well radiative turbulent heat fluxes. simulate analysis variables throughout campaign, but have difficulties with most...
Abstract Near‐surface air temperatures close to 0°C were observed in situ over sea ice the central Arctic during last three winter seasons. Here we use (December–March) temperature observations, such as those from Soviet North Pole drifting stations and ocean buoys, determine how common warming events are. Observations of exist most Basin. Temperatures exceeding −5°C >30% winters 1954 2010 by or buoys. Using ERA‐Interim record (1979–2016), show that (NP) region typically experiences 10...
Typically 20–40 extreme cyclone events (sometimes called 'weather bombs') occur in the Arctic North Atlantic per winter season, with an increasing trend of 6 events/decade over 1979–2015, according to hourly station data from Ny-Ålesund. This increased frequency cyclones is consistent observed significant warming, indicating that meridional heat and moisture transport they bring a factor rising temperatures region. The dominated by positive monthly about 3–4 November–December, due mainly...
article Free Access Share on Protection in an information processing utility Author: Robert M. Graham Massachusetts Institute of Technology, Cambridge CambridgeView Profile Authors Info & Claims Communications the ACMVolume 11Issue 5May 1968pp 365–369https://doi.org/10.1145/363095.363146Published:01 May 1968Publication History 89citation730DownloadsMetricsTotal Citations89Total Downloads730Last 12 Months84Last 6 weeks26 Get Citation AlertsNew Alert added!This alert has been successfully...
The location of fronts has a direct influence on both the physical and biological processes in Southern Ocean. Here we explore relative importance bottom topography winds for Ocean fronts, using 100 years control climate change simulation from high resolution coupled model HiGEM. Topography primary number intensity at each longitude. However, there is no strong relationship between position or spacing jets underlying topographic gradients because effects upstream downstream topography....
A large retreat of sea-ice in the 'stormy' Atlantic Sector Arctic Ocean has become evident through a series record minima for winter maximum extent since 2015. Results from Norwegian young sea ICE (N-ICE2015) expedition, five-month-long (Jan-Jun) drifting ice station first and second year pack-ice north Svalbard, showcase how this region is frequently affected by passing storms. Here we synthesise interdisciplinary N-ICE2015 dataset, including independent observations atmosphere, snow,...
Abstract The subseasonal-to-seasonal (S2S) predictive time scale, encompassing lead times ranging from 2 weeks to a season, is at the frontier of forecasting science. Forecasts on this scale provide opportunities for enhanced application-focused capabilities complement existing weather and climate services products. There is, however, “knowledge–value” gap, where lack evidence awareness potential socioeconomic benefits S2S forecasts limits their wider uptake. To address here we present first...
Abstract Atmospheric measurements were made over Arctic sea ice north of Svalbard from winter to early summer (January–June) 2015 during the Norwegian Young Sea Ice (N‐ICE2015) expedition. These measurements, which are available publicly, represent a comprehensive meteorological data set covering seasonal transition in Basin new, thinner regime. Winter was characterized by succession storms that produced short‐lived (less than 48 h) temperature increases 20 30 K at surface. driven...
Abstract During the Norwegian young sea ICE (N‐ICE2015) campaign in early 2015, a deep snowpack was observed, almost double climatology for region north of Svalbard. There were significant amounts snow‐ice second‐year ice (SYI), while much less first‐year (FYI). Here we use 1‐D snow/ice thermodynamic model, forced with reanalyses, to show that contributes thickness growth SYI absence any bottom growth, due thick snow. Growth FYI is tightly controlled by timing onset relative precipitation...
Abstract Winter time atmospheric observations from the 2015 Norwegian young sea‐ICE campaign (N‐ICE2015) are compared with data 1997–1998 Surface Heat Budget of Arctic (SHEBA) campaign. Both sets have a bimodal distribution net longwave radiative flux for January–February, modal values −40 W m −2 and 0 . These correspond to radiatively clear opaquely cloudy states, respectively, likely be representative wider Arctic. The new N‐ICE2015 demonstrate that two winter states operate in Atlantic...
[1] The Southern Ocean Subtropical Front (STF) is thought to play a key role in the global climate system. Theory suggests that latitude of STF regulates volume saline Agulhas Leakage into Atlantic from Indian. Here we use satellite sea surface temperature (SST) and height (SSH) data study physical characteristics water mass boundary. We find strong currents this region do not align with Therefore, provide new climatology for these which define as Dynamical (DSTF). DSTF eastward extension...
Primary productivity is limited by the availability of iron over large areas global ocean. Changes in supply to these regions could have major impacts on primary and carbon cycle. However, source mechanisms oceans remain poorly constrained. Shelf sediments are considered one largest sources dissolved ocean, a shelf sediment flux prescribed many biogeochemical models all bathymetry shallower than 1000 m. Here, we infer likely location Southern Ocean, identifying where satellite chlorophyll...
Abstract Oceanographic observations from the Eurasian Basin north of Svalbard collected between January and June 2015 N‐ICE2015 drifting expedition are presented. The unique winter a key contribution to existing climatologies Arctic Ocean, show ∼100 m deep mixed layer likely due high sea ice growth rates in local leads. Current for upper ∼200 mostly barotropic flow, enhanced over shallow Yermak Plateau. two branches inflowing Atlantic Water partly captured, confirming that outer Branch...
[1] In recent years the latitudinal position of Subtropical Front (STF) has emerged as a key parameter in global climate. A poleward positioned front is thought to allow greater salt flux from Indian Atlantic Ocean and so drive stronger Meridional Overturning Circulation. Here common view that STF aligns with zero wind stress curl (WSC) challenged. Based on climatologies Orsi et al. (1995), Belkin Gordon (1996), Graham De Boer (2013), satellite scatterometry winds, we find WSC contour lies...
Abstract Snow is a crucial component of the Arctic sea ice system. Its thickness and thermal properties control heat conduction radiative fluxes across ocean, ice, atmosphere interfaces. Hence, observations evolution snow depth, density, conductivity, stratigraphy are for development detailed numerical models predicting energy transfer through pack. depth also major uncertainty in using remote sensing algorithms. Here we examine winter spatial temporal physical on first‐year (FYI)...
Abstract We examine the regional variations and long‐term changes of potential for snow‐ice formation level Arctic sea ice from 1980 to 2016. use daily motion data implement a 1‐D snow/ice thermodynamic model that follows trajectories while forcing simulations with Modern‐Era Retrospective analysis Research Applications, Version 2 ERA‐Interim reanalyses. find there is in over most Ocean; this true since 1980s. In addition, are very strong. The largest typically found Atlantic sector Ocean,...
Studies have shown marked sex disparities in Coronary Artery Diseases (CAD) epidemiology, yet the underlying mechanisms remain unclear. We explored coronary anatomy and resulting haemodynamics patients with suspected but no significant CAD. Left Main (LM) bifurcations were 3D-reconstructed from 127 Computed Tomography Angiography images (42 males 85 females, aged 38-81). Shape parameters including bifurcation angles, curvature, diameters measured, before solving clinically relevant...
In this paper we will define and discuss a solution to some of the problems concerned with protection security in an information processing utility. This is not intended be exhaustive study all aspects such system. Instead, concentrate our attention on protecting both user system (procedures data) during execution process. We give special problem when shared procedures data are permitted.
Abstract The Norwegian young sea ICE (N‐ICE2015) expedition was designed to investigate the atmosphere‐snow‐ice‐ocean interactions in and thin ice regime north of Svalbard. Radiosondes were launched twice daily during from January June 2015. Here we use these upper air measurements study multiple cyclonic events observed N‐ICE2015 with respect changes vertical thermodynamic structure, moisture content, boundary layer characteristics. We provide statistics temperature inversion...
article Free Access Share on An Algorithm for Translating Boolean Expressions Authors: Bruce W. Arden University of Michigan, Ann Arbor, Michigan MichiganView Profile , Bernard A. Galler Robert M. Graham Authors Info & Claims Journal the ACMVolume 9Issue 2April 1962 pp 222–239https://doi.org/10.1145/321119.321121Published:01 April 1962Publication History 26citation571DownloadsMetricsTotal Citations26Total Downloads571Last 12 Months66Last 6 weeks10 Get Citation AlertsNew Alert added!This...
A critical failure of current software system design and implementation methodology is that the performance a proposed not evaluated before it actually implemented. In this paper reasons for are explored, new which overcomes many difficulties proposed. integrates evaluation with described. This based on simple, high level language used to describe evolving at all stages its development. The source description as direct input analysis simulation routines. Using information obtained from these...