Simulation of electromagnetic signal of profile observations from a drifting surface

As part of the RSF project, the use of a drifting surface on which geophysical installations will be placed is proposed to study the environment in the Arctic region. The proposed method of electrical exploration is sounding with a circular electric dipole as a source. Studying the applicability of the technique requires three–dimensional simulation of the received signal. The paper shows some simulation results using the previously proposed algorithm based on the Born approximation.

Download Full-text

SIMULATION OF ELECTROMAGNETIC SOUNDING SIGNALS FROM THE ARCTIC ICE SURFACE

Interexpo GEO-Siberia ◽

10.33764/2618-981x-2019-2-2-116-123 ◽

2019 ◽

Vol 2 (2) ◽

pp. 116-123

Author(s):

Polina Osipova ◽

Vladimir Mogilatov ◽

Arkadiy Zlobinskiy

Keyword(s):

Born Approximation ◽

Three Dimensional ◽

Arctic Region ◽

The Arctic ◽

Electromagnetic Sounding ◽

Three Dimensional Modeling ◽

Ice Surface ◽

Dimensional Modeling ◽

Arctic Ice ◽

The Arctic Region

Electromagnetic sounding of the Arctic region is hampered by the influence of the conductive layer of seawater. As part of the RSF project, it is proposed to use a circular electrical dipole (CED) to excite the field. Installation should be placed on drifting ice. This technique requires three-dimensional modeling for which there are complex algorithms. The paper proposes an approach using the Born approximation to simplify the implementation of three-dimensional modeling of the electromagnetic sounding signal using CED.

Download Full-text

Applying an isotope-enabled regional climate model over the Greenland ice sheet: effect of spatial resolution on model bias

Climate of the Past ◽

10.5194/cp-17-1685-2021 ◽

2021 ◽

Vol 17 (4) ◽

pp. 1685-1699

Author(s):

Marcus Breil ◽

Emanuel Christner ◽

Alexandre Cauquoin ◽

Martin Werner ◽

Melanie Karremann ◽

...

Keyword(s):

Spatial Resolution ◽

General Circulation ◽

Climate Model ◽

Regional Climate ◽

Circulation Model ◽

Ice Cores ◽

Arctic Region ◽

The Arctic ◽

Simulation Results ◽

The Arctic Region

Abstract. In order to investigate the impact of spatial resolution on the discrepancy between simulated δ18O and observed δ18O in Greenland ice cores, regional climate simulations are performed with the isotope-enabled regional climate model (RCM) COSMO_iso. For this purpose, isotope-enabled general circulation model (GCM) simulations with the ECHAM5-wiso general circulation model (GCM) under present-day conditions and the MPI-ESM-wiso GCM under mid-Holocene conditions are dynamically downscaled with COSMO_iso for the Arctic region. The capability of COSMO_iso to reproduce observed isotopic ratios in Greenland ice cores for these two periods is investigated by comparing the simulation results to measured δ18O ratios from snow pit samples, Global Network of Isotopes in Precipitation (GNIP) stations and ice cores. To our knowledge, this is the first time that a mid-Holocene isotope-enabled RCM simulation is performed for the Arctic region. Under present-day conditions, a dynamical downscaling of ECHAM5-wiso (1.1∘×1.1∘) with COSMO_iso to a spatial resolution of 50 km improves the agreement with the measured δ18O ratios for 14 of 19 observational data sets. A further increase in the spatial resolution to 7 km does not yield substantial improvements except for the coastal areas with its complex terrain. For the mid-Holocene, a fully coupled MPI-ESM-wiso time slice simulation is downscaled with COSMO_iso to a spatial resolution of 50 km. In the mid-Holocene, MPI-ESM-wiso already agrees well with observations in Greenland and a downscaling with COSMO_iso does not further improve the model–data agreement. Despite this lack of improvement in model biases, the study shows that in both periods, observed δ18O values at measurement sites constitute isotope ratios which are mainly within the subgrid-scale variability of the global ECHAM5-wiso and MPI-ESM-wiso simulation results. The correct δ18O ratios are consequently not resolved in the GCM simulation results and need to be extracted by a refinement with an RCM. In this context, the RCM simulations provide a spatial δ18O distribution by which the effects of local uncertainties can be taken into account in the comparison between point measurements and model outputs. Thus, an isotope-enabled GCM–RCM model chain with realistically implemented fractionating processes constitutes a useful supplement to reconstruct regional paleo-climate conditions during the mid-Holocene in Greenland. Such model chains might also be applied to reveal the full potential of GCMs in other regions and climate periods, in which large deviations relative to observed isotope ratios are simulated.

Download Full-text

The three-dimensional spatial autocorrelation of ionospherically propagated wave packets in the arctic region

2013 IEEE Radar Conference (RadarCon13) ◽

10.1109/radar.2013.6586155 ◽

2013 ◽

Cited By ~ 2

Author(s):

Ryan J. Riddolls

Keyword(s):

Spatial Autocorrelation ◽

Wave Packets ◽

Three Dimensional ◽

Arctic Region ◽

The Arctic ◽

The Arctic Region

Download Full-text

The role of tropopause polar vortices in the intensification of Summer Arctic cyclones

10.5194/egusphere-egu21-2875 ◽

2021 ◽

Author(s):

Suzanne L. Gray ◽

Kevin Hodges ◽

Jonathan Vautrey ◽

John Methven

Keyword(s):

Three Dimensional ◽

Arctic Region ◽

The Arctic ◽

Polar Regions ◽

Synoptic Scale ◽

Coherent Vortices ◽

Cyclone Genesis ◽

Ecmwf Reanalysis ◽

The Arctic Region

<p>Human activity in the Arctic is expected to increase as new regions become accessible, with a consequent need for reliable forecasts of hazardous weather. Arctic cyclones are synoptic-scale cyclones developing within or moving into the Arctic region. Meso- to synoptic-scale tropopause-based coherent vortices called tropopause polar vortices (TPVs) are frequently observed in polar regions and are a proposed mechanism for Arctic cyclone genesis and intensification. While the importance of pre-existing tropopause-level features for cyclone development, and their existence as part of the three-dimensional mature cyclone structure, is well established in the mid-latitudes, evidence of the importance of pre-existing TPVs for Arctic cyclone development is more limited. Here we present a climatology and characteristics of summer Arctic cyclones and TPVs, produced by tracking them in the latest global ECMWF reanalysis (ERA5), and determine the role of pre-existing TPVs in the initiation and intensification of these cyclones.</p>

Download Full-text

Short-lived climate forcers from current shipping and petroleum activities in the Arctic

Atmospheric Chemistry and Physics ◽

10.5194/acp-12-1979-2012 ◽

2012 ◽

Vol 12 (4) ◽

pp. 1979-1993 ◽

Cited By ~ 47

Author(s):

K. Ødemark ◽

S. B. Dalsøren ◽

B. H. Samset ◽

T. K. Berntsen ◽

J. S. Fuglestvedt ◽

...

Keyword(s):

Radiative Forcing ◽

State Of The Art ◽

Three Dimensional ◽

Arctic Region ◽

The Arctic ◽

Mean Values ◽

Albedo Effect ◽

Carbon Aerosols ◽

Petroleum Extraction ◽

The Arctic Region

Abstract. Emissions of short-lived climate forcers (SLCF) in the Arctic region are expected to increase, notably from shipping and petroleum extraction. We here discuss changes in atmospheric SLCF concentrations and resulting radiative forcing (RF) from present day shipping and petroleum activities in the Arctic. The three-dimensional chemistry transport OsloCTM2 and a state of the art radiative forcing model are used, based on a coherent dataset of present day Arctic emissions. We find that the net RF of SLCF of shipping in the Arctic region is negative, mainly due to the direct and indirect RF effects of sulphate emissions, while the net RF of SLCF of petroleum extraction is positive, mainly due to the effects of black carbon aerosols in the air and deposited on snow. Strong seasonal variations of the sensitivities to emissions are found. In terms of annual mean values we find that the Arctic sensitivities to SLCF is similar to global average sensitivities. One exception to this is the stronger snow/ice albedo effect from BC emissions.

Download Full-text

704 Three dimensional Na lidar observation in the Arctic region

The Proceedings of Yamanashi District Conference ◽

10.1299/jsmeyamanashi.2013.190 ◽

2013 ◽

Vol 2013 (0) ◽

pp. 190-191

Author(s):

Wataru Muranaka ◽

Takuya Kawahara ◽

Hikaru Fukasawa ◽

Satonori Nozawa

Keyword(s):

Three Dimensional ◽

Arctic Region ◽

The Arctic ◽

Lidar Observation ◽

The Arctic Region

Download Full-text

Nuclear icebreaker fleet and power supply on the basis of floating power units

Voprosy regionalnoj ekonomiki ◽

10.21499/2078-4023-2018--4-110-113 ◽

2018 ◽

Vol 35 (4) ◽

pp. 110-113

Author(s):

V. A. Tupchienko ◽

H. G. Imanova

Keyword(s):

Foreign Policy ◽

Power Supply ◽

Nuclear Power ◽

Arctic Region ◽

Nuclear Industry ◽

The Arctic ◽

Far North ◽

The Arctic Region

The article deals with the problem of the development of the domestic nuclear icebreaker fleet in the context of the implementation of nuclear logistics in the Arctic. The paper analyzes the key achievements of the Russian nuclear industry, highlights the key areas of development of the nuclear sector in the Far North, and identifies aspects of the development of mechanisms to ensure access to energy on the basis of floating nuclear power units. It is found that Russia is currently a leader in the implementation of the nuclear aspect of foreign policy and in providing energy to the Arctic region.

Download Full-text