Current Magnitude and Mechanisms of Groundwater Discharge in the Arctic: Case Study from Alaska

2015 ◽  
Vol 49 (20) ◽  
pp. 12036-12043 ◽  
Author(s):  
Natasha T. Dimova ◽  
Adina Paytan ◽  
John D. Kessler ◽  
Katy J. Sparrow ◽  
Fenix Garcia-Tigreros Kodovska ◽  
...  
Keyword(s):  
Groundwater Discharge ◽  
The Arctic ◽  
Current Magnitude

scholarly journals Ocean-Bottom Seismographs Based on Broadband MET Sensors: Architecture and Deployment Case Study in the Arctic

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 3979
Author(s):  
Artem A. Krylov ◽  
Ivan V. Egorov ◽  
Sergey A. Kovachev ◽  
Dmitry A. Ilinskiy ◽  
Oleg Yu. Ganzha ◽  
...  
Keyword(s):  
Site Response ◽  
The Arctic ◽  
Laptev Sea ◽  
Ocean Bottom ◽  
Arctic Seas ◽  
Shirshov Institute ◽  
Study Results ◽  
Ocean Bottom Seismographs ◽  
The Laptev Sea

The Arctic seas are now of particular interest due to their prospects in terms of hydrocarbon extraction, development of marine transport routes, etc. Thus, various geohazards, including those related to seismicity, require detailed studies, especially by instrumental methods. This paper is devoted to the ocean-bottom seismographs (OBS) based on broadband molecular–electronic transfer (MET) sensors and a deployment case study in the Laptev Sea. The purpose of the study is to introduce the architecture of several modifications of OBS and to demonstrate their applicability in solving different tasks in the framework of seismic hazard assessment for the Arctic seas. To do this, we used the first results of several pilot deployments of the OBS developed by Shirshov Institute of Oceanology of the Russian Academy of Sciences (IO RAS) and IP Ilyinskiy A.D. in the Laptev Sea that took place in 2018–2020. We highlighted various seismological applications of OBS based on broadband MET sensors CME-4311 (60 s) and CME-4111 (120 s), including the analysis of ambient seismic noise, registering the signals of large remote earthquakes and weak local microearthquakes, and the instrumental approach of the site response assessment. The main characteristics of the broadband MET sensors and OBS architectures turned out to be suitable for obtaining high-quality OBS records under the Arctic conditions to solve seismological problems. In addition, the obtained case study results showed the prospects in a broader context, such as the possible influence of the seismotectonic factor on the bottom-up thawing of subsea permafrost and massive methane release, probably from decaying hydrates and deep geological sources. The described OBS will be actively used in further Arctic expeditions.

scholarly journals Improving the inverse modeling of a trace isotope: how precisely can radium-228 fluxes toward the ocean and submarine groundwater discharge be estimated?

2017 ◽  
Vol 14 (13) ◽  
pp. 3171-3189 ◽  
Author(s):  
Guillaume Le Gland ◽  
Laurent Mémery ◽  
Olivier Aumont ◽  
Laure Resplandy
Keyword(s):  
Ocean Circulation ◽  
Inverse Modeling ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Radioactive Decay ◽  
The Arctic ◽  
Time Data ◽  
Global Estimate ◽  
Submarine Groundwater ◽  
First Time

Abstract. Radium-228 (228Ra), an almost conservative trace isotope in the ocean, supplied from the continental shelves and removed by a known radioactive decay (T1∕2 = 5. 75 years), can be used as a proxy to constrain shelf fluxes of other trace elements, such as nutrients, iron, or rare earth elements. In this study, we perform inverse modeling of a global 228Ra dataset (including GEOSECS, TTO and GEOTRACES programs, and, for the first time, data from the Arctic and around the Kerguelen Islands) to compute the total 228Ra fluxes toward the ocean, using the ocean circulation obtained from the NEMO 3.6 model with a 2° resolution. We optimized the inverse calculation (source regions, cost function) and find a global estimate of the 228Ra fluxes of 8.01–8. 49 × 1023 atoms yr−1, more precise and around 20 % lower than previous estimates. The largest fluxes are in the western North Atlantic, the western Pacific and the Indian Ocean, with roughly two-thirds in the Indo-Pacific Basin. An estimate in the Arctic Ocean is provided for the first time (0.43–0.50  ×  1023 atoms yr−1). Local misfits between model and data in the Arctic, the Gulf Stream and the Kuroshio regions could result from flaws of the ocean circulation in these regions (resolution, atmospheric forcing). As radium is enriched in groundwater, a large part of the 228Ra shelf sources comes from submarine groundwater discharge (SGD), a major but poorly known pathway for terrestrial mineral elements, including nutrients, to the ocean. In contrast to the 228Ra budget, the global estimate of SGD is rather unconstrained, between 1.3 and 14. 7 × 1013 m3 yr−1, due to high uncertainties on the other sources of 228Ra, especially diffusion from continental shelf sediments. Better precision on SGD cannot be reached by inverse modeling until a proper way to separate the contributions of SGD and diffusive release from sediments at a global scale is found.

scholarly journals TRANSARCTIC PERSPECTIVES OF IBERO-AMERICA

2020 ◽  
Vol 6 (4(73)) ◽  
pp. 36-39
Author(s):  
E.O. Labeckaya
Keyword(s):  
Russian Federation ◽  
Energy Transport ◽  
The Arctic ◽  
Global Competition ◽  
Arctic Zone ◽  
Case Study Method ◽  
The Russian Federation ◽  
Transnational Space

Through the concept of transnational space and “case-study” method, the prospects for the involvement of Ibero-America in the virtual Trans-Arctic, which is turning into a geoeconomic and geopolitical "bond" of two neighboring spaces – Trans-Atlantic and Trans-Pacific – are considered. The strengthening of Iberoamerican states’ presence in the Trans-Arctic will be a factor in increasing their ratings in the global hierarchy, will provide them with new geopolitical advantages for global competition, will strengthen comprehensive security (economic, environmental, energy, transport and logistics, food, water). In the context of the Arctic interests of Ibero-America, special attention is paid to options for possible "win-win" cooperation in the Arctic zone of the Russian Federation, including taking into account the potential of BRICS and its "outreach" and "BRICS +" platforms. Highlighted fundamental legal differences between Trans-Arctic and Antarctic. The Arctic prospects of Brazil as a channel for the realization of the circumpolar interests of the Iberoamerican states are emphasized

scholarly journals Governing the Arctic: The Russian State Commission for Arctic Development and the Forging of a New Domestic Arctic Policy Agenda

2019 ◽  
Vol 10 (0) ◽  
pp. 190
Author(s):  
Helge Blakkisrud
Keyword(s):  
Policy Formulation ◽  
The State ◽  
The Arctic ◽  
Policy Agenda ◽  
Russian Government ◽  
State Commission ◽  
Relative Neglect ◽  
The Government ◽  
Arctic Policy

After a period of relative neglect in the 1990s and early 2000s, the Arctic is back on the agenda of the Russian authorities. To ensure efficient coordination and implementation of its Arctic strategy, the government in 2015 established a State Commission for Arctic Development. It was to serve as a platform for coordinating the implementation of the government’s ambitious plans for the Arctic, for exchange of information among Arctic actors, and for ironing out interagency and interregional conflicts. Based on a case study of the State Commission for Arctic Development, this article has a twofold goal. First, it explores the current Russian domestic Arctic agenda, mapping key actors and priorities and examining the results achieved so far. Second, it discusses what this case study may tell us the about policy formulation and implementation in Russia today. We find that while the government’s renewed focus on the Arctic Zone has yielded some impressive results, the State Commission has been at best a mixed success. The case study demonstrates how, in the context of authoritarian modernization, the Russian government struggles to come up with effective and efficient institutions for Arctic governance. Moreover, the widespread image of a Russian governance model based on a strictly hierarchic “power vertical” must be modified. Russia’s Arctic policy agenda is characterized by infighting and bureaucratic obstructionism: even when Putin intervenes personally, achieving the desired goals can prove difficult.

scholarly journals Small States and the Struggle for Power in the Arctic Region: A Case Study of Denmark

Politologija ◽  
2019 ◽  
Vol 94 (2) ◽  
pp. 81-108
Author(s):  
Gabija Lukšaitė
Keyword(s):  
Foreign Policy ◽  
Arctic Region ◽  
The Arctic ◽  
Small States ◽  
Small State ◽  
Theoretical Approaches ◽  
International Environment ◽  
Foreign Policy Strategies ◽  
The Arctic Region

This paper examines the specifics of foreign policy strategies used by Denmark as a small state in the Arctic region. Based upon a number of theoretical approaches in terms of analyzing small state foreign policy, this study is primarily focused on how small states manage to pursue their goals in an international environment typically dominated by large powers.

Sign in / Sign up

Export Citation Format

Share Document