Quasi real-time electromagnetic and greenhouse gases monitoring station at Seymour - Marambio Island, Antarctica

A new permanent geophysical station was installed in the Seymour-Marambio Island, Antarctica, for monitoring electromagnetic, CO2, and CH4 gas signals. Those signals require specialized low noise instruments and the survey shall be carried out in places far away from cultural noise, such as populated human settlements. The most suitable place would be near the Earth's poles, where noise is the lowest possible. To measure these variables, the Geophysical Instrumentation Laboratory (Laboratorio de Instrumentación Geofísica - LIG) of the Universidad Nacional de Colombia, in a partnership with the Instituto Antártico Argentino (IAA) under the Argentinean National Antarctic Direction (Dirección Nacional del Antártico - DNA), deployed the COCOAonMEAT project, oriented to design, built and install a low-cost station with time synchronization via GPS and data transmission in almost real-time. Since January 2020, the project monitors continuously (24/7) seven variables: three magnetic components, two electric dipoles, methane (CH4), and carbon dioxide (CO2) gas. Due to operative facilities and its low electromagnetic noise, the place chosen for its installation was the Argentinean Marambio Scientific Base in the Antarctic Peninsula, with the Multidisciplinary Antarctic Laboratory's collaboration (Laboratorio Multidisciplinario Antártico en la Base Marambio - LAMBI). This station provides valuable information on electromagnetic signals and greenhouse gases related to regional tectonic activity and local perturbations associated with global climate change.

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Greenhouse gas flux studies: An automated online system for gas emission measurements in aquatic environments

10.5194/hess-2019-83 ◽

2019 ◽

Cited By ~ 2

Author(s):

Nguyen Thanh Duc ◽

Samuel Silverstein ◽

Martin Wik ◽

Patrick Crill ◽

David Bastviken ◽

...

Keyword(s):

Climate Models ◽

Time Synchronization ◽

Low Cost ◽

Ghg Emissions ◽

Raspberry Pi ◽

Radio Communication ◽

Flux Chamber ◽

Robust Measurements ◽

Carbon Dioxide Co2 ◽

Ghg Fluxes

Abstract. Aquatic ecosystems are major sources of greenhouse gases (GHG). Robust measurements of natural GHG emissions are vital for evaluating regional to global carbon budgets and for assessing climate feedbacks on natural emissions to improve climate models. Diffusive and ebullitive (bubble) transport are two major pathways of gas release from surface waters. To capture the high temporal variability of these fluxes in a well-defined footprint, we designed and built an inexpensive device that includes an easily mobile diffusive flux chamber and a bubble counter, all in one. In addition to automatically collecting gas samples for subsequent various analyses in the laboratory, this device also utilizes a low cost carbon dioxide (CO2) sensor (SenseAir, Sweden) and methane (CH4) sensor (Figaro, Japan) to measure GHG fluxes. Each of the devices were equipped with an XBee module to enable a local radio communication (DigiMesh network) for time synchronization, and data readout at a server-controller station on the lakeshore. Software of this server-controller is operated on a low-cost computer (Raspberry Pi) which has a 3G connection for remote control and monitor functions from anywhere in the world. This study shows the potential of a low cost automatic sensor network system to study GHG fluxes on lakes in remote locations.

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Technical note: Greenhouse gas flux studies: an automated online system for gas emission measurements in aquatic environments

Hydrology and Earth System Sciences ◽

10.5194/hess-24-3417-2020 ◽

2020 ◽

Vol 24 (7) ◽

pp. 3417-3430 ◽

Cited By ~ 1

Author(s):

Nguyen Thanh Duc ◽

Samuel Silverstein ◽

Martin Wik ◽

Patrick Crill ◽

David Bastviken ◽

...

Keyword(s):

Climate Models ◽

Time Synchronization ◽

Low Cost ◽

Ghg Emissions ◽

Technical Note ◽

Raspberry Pi ◽

Radio Communication ◽

Flux Chamber ◽

Carbon Dioxide Co2 ◽

Ghg Fluxes

Abstract. Aquatic ecosystems are major sources of greenhouse gases (GHGs). Robust measurements of natural GHG emissions are vital for evaluating regional to global carbon budgets and for assessing climate feedbacks of natural emissions to improve climate models. Diffusive and ebullitive (bubble) transport are two major pathways of gas release from surface waters. To capture the high temporal variability of these fluxes in a well-defined footprint, we designed and built an inexpensive device that includes an easily mobile diffusive flux chamber and a bubble counter all in one. In addition to automatically collecting gas samples for subsequent various analyses in the laboratory, this device also utilized a low-cost carbon dioxide (CO2) sensor (SenseAir, Sweden) and methane (CH4) sensor (Figaro, Japan) to measure GHG fluxes. Each of the devices was equipped with an XBee module to enable local radio communication (DigiMesh network) for time synchronization and data readout at a server controller station on the lakeshore. The software of this server controller was operated on a low-cost computer (Raspberry Pi), which has a 3G connection for remote control and monitor functions from anywhere in the world. This study shows the potential of a low-cost automatic sensor network system for studying GHG fluxes on lakes in remote locations.

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Onland and Offshore Extrinsic Fabry–Pérot Optical Seismometer at the End of a Long Fiber

Seismological Research Letters ◽

10.1785/0220190049 ◽

2019 ◽

Vol 90 (6) ◽

pp. 2205-2216 ◽

Cited By ~ 2

Author(s):

Pascal Bernard ◽

Romain Feron ◽

Guy Plantier ◽

Alexandre Nercessian ◽

Julien Couteau ◽

...

Keyword(s):

Real Time ◽

Large Scale ◽

Low Cost ◽

Optical Power ◽

Relative Displacement ◽

Low Noise ◽

Ocean Bottom ◽

Broadband Seismometer ◽

Fabry Perot ◽

Mobile Mass

ABSTRACT We report here the design, performance, and in situ demonstration, on‐land and offshore, of an innovative high‐resolution low‐cost optical (laser) seismometer. The instrument was developed within the Laser Interferometry for Earth Strain project (French Agence Nationale de la Recherche [ANR] program), and first tested at the low‐noise underground laboratory Laboratoire Souterrain à Bas Bruit (LSBB, France). It is based on Fabry–Pérot optical interferometry between the extremity of a probing optical fiber and a reflecting mirror secured to the mobile mass of a passive 2 Hz geophone. The detection technique is based on the wavelength modulation of the laser diode (1310 nm), which allows the separation of the optical power into two signals in quadrature, thanks to an heterodyne technique. The relative displacement of the mobile mass is retrieved in real time by the phase unwrapping of these two signals. At LSBB, the fiber was 3 km long. It recorded many teleseismic earthquakes and a few regional ones, and resolves the low‐seismic noise of the Earth for periods up to 6 s, presenting an acceleration noise floor lower than 1 ng/Hz in the 0.3–5 Hz range. A three‐component version of this fiber‐based interferometric 2 Hz geophone has been recently constructed, shielded in a hyperbaric container, and installed offshore for test in Brittany (France) in April 2018, with an improved control system. Its record of the marine ambient noise matches those of a collocated commercial broadband seismometer for periods up to 50 s. This opens promising perspectives for large‐scale ocean bottom instrumentation with up to 50‐kilometer‐long optical lines; an installation is planned for 2020, off Guadeloupe, with a 5‐kilometer‐long fiber cable. It may also prove useful for installations in other challenging and exposed environments, such as deep hot boreholes, active volcanoes, unstable landslides, for real‐time monitoring in regions with high natural hazard, but also for seismic monitoring of geoindustries.

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Stable Isotopes in Greenhouse Gases from Soil: A Review of Theory and Application

Atmosphere ◽

10.3390/atmos10070377 ◽

2019 ◽

Vol 10 (7) ◽

pp. 377 ◽

Cited By ~ 3

Author(s):

Xiao-cong Zhu ◽

Dong-rui Di ◽

Ming-guo Ma ◽

Wei-yu Shi

Keyword(s):

Climate Change ◽

Carbon Dioxide ◽

Stable Isotopes ◽

Greenhouse Gases ◽

Global Climate Change ◽

Global Climate ◽

Atmospheric Environment ◽

Future Research ◽

Research Needs ◽

Carbon Dioxide Co2

Greenhouse gases emitted from soil play a crucial role in the atmospheric environment and global climate change. The theory and technique of detecting stable isotopes in the atmosphere has been widely used to an investigate greenhouse gases from soil. In this paper, we review the current literature on greenhouse gases emitted from soil, including carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). We attempt to synthesize recent advances in the theory and application of stable isotopes in greenhouse gases from soil and discuss future research needs and directions.

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Methane removal using materials from biofilters at composting plants

Journal of Vietnamese Environment ◽

10.13141/jve.vol10.no1.pp22-26 ◽

2018 ◽

Vol 10 (1) ◽

pp. 22-26

Author(s):

Thanh Phong Nguyen ◽

Carsten Cuhls

Keyword(s):

Carbon Dioxide ◽

Gas Chromatography ◽

Greenhouse Gases ◽

Methane Oxidation ◽

Low Cost ◽

Anaerobic Conditions ◽

Air Purifier ◽

Ch4 Concentration ◽

Carbon Dioxide Co2 ◽

Dinitrogen Monoxide

Methane (CH4) source of Greenhouse Gases should be considered; CH4 is formed by composting under anaerobic conditions. Using microbial Methane oxidation is a solution with low cost and effective. In this study, 27 bio-filters and 18 laboratory-scale bioreactors were used to investigate the potential for CH4 removal in biogas. The CH4, Dinitrogen monoxide (N2O) and Carbon dioxide (CO2) concentrations at the inlet and outlet of the air purifier were measured by gas chromatography. The results showed that the CH4 concentration decreased in experiments while the CO2 and N2O content increased in all experiments. An experiment was conducted with 1 kg of biofilter material with the input of 800 ppm CH4 contained in a 5-liter flask for 49 hours containing. The results also showed that the CH4 concentration decreased by 71% after 20 hours and N2O was formed in the reactor. Mê-tan (CH4) là nguồn khí gây nên hiệu ứng nhà kính cần được quan tâm, khí CH4 được sinh ra trong quá trình ủ vi sinh trong điều kiện kị khí. Một giải pháp với chi phí thấp là sử dụng vi sinh vật oxy hóa khí CH4 cố định trên giá thể là vật liệu sử dụng trong thiết bị lọc sinh học. Trong nghiên cứu này, 27 thiết bị lọc sinh học trên thực tế và 19 bình lọc tại phòng thí nghiệm đã được sử dụng nhằm mục đích khảo sát khả năng loại bỏ CH4 có trong khí sinh học. Nồng độ khí CH4, N2O và CO2 ở đầu vào và đầu ra bể lọc khí được đo đạc bằng phương pháp sắc ký khí. Kết quả cho thấy nồng độ khí CH4 giảm sau khi qua hệ thống lọc sinh học ở một số bình, trong khi nồng độ khí CO2 và N2O lại tăng lên ở tất cả các bình. Khi khảo sát khả năng oxi hóa CH4 ở nồng độ 800 ppm của 1kg vật liệu thiết bị lọc sinh học chứa trong bình phản ứng thể tích 5L với thời gian 49 giờ. Kết quả cho thấy nồng nồng độ CH4 giảm 71% sau 20 giờ. Tuy nhiên, N2O đã được ghi nhận có hình thành trong bình phản ứng đó.

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Guest Editorial: Global Warming and Population Health

Australian Journal of Primary Health ◽

10.1071/py98001 ◽

1998 ◽

Vol 4 (1) ◽

pp. 6

Author(s):

Shilu Tong

Keyword(s):

Greenhouse Gases ◽

Guest Editorial ◽

Industrial Revolution ◽

Global Climate ◽

Agricultural Practices ◽

Anthropogenic Sources ◽

Fossil Fuel Combustion ◽

Cement Production ◽

International Panel ◽

Carbon Dioxide Co2

Since the industrial revolution, the contribution of anthropogenic sources of greenhouse gases to the global environment has significantly increased. Greenhouse gases, including carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), are accumulating in the atmosphere. These trends are largely attributed to human activities, primarily fossil-fuel combustion, some industrial processes, for example cement production and mining, changes in land use, and agricultural practices. The International Panel on Climate Change (IPCC), made up of more than 2,500 of the world's leading scientists, has recently concluded that human activity might have already begun to change the global climate, and in the absence of efforts to reduce greenhouse gases, the concentrations of these gases are expected to increase significantly throughout the next century (IPCC, 1996).

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Review: emission and absorption of greenhouse gases by soils. Ecological problems

Anthropogenic Transformation of Nature ◽

10.17072/2410-8553-2021-1-6-34 ◽

2021 ◽

Vol 7 (1) ◽

pp. 6-34

Author(s):

Y.A. Fedorov ◽

◽

V.V. Sukhorukov ◽

R.G. Trubnik ◽

◽

...

Keyword(s):

Greenhouse Gases ◽

Methane Emission ◽

Global Climate ◽

Point Of View ◽

Anthropogenic Factors ◽

Global Changes ◽

Carbon Dioxide Co2 ◽

Climate Studies ◽

Natural And Anthropogenic Factors

Abstract: Soils are a source and sink of greenhouse gases (GHG) such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Since the volumes of concentration and flux can be large, accurate quantitative estimates are needed to obtain the data on global GHG fluxes required for forecasting global changes and climate studies. This review shows the role of soils as one of the important sources and regulators of the content of CH4, CO2, N2O in the troposphere, and also presents the main methods for monitoring greenhouse gases. The influence of natural and anthropogenic factors on the emission and absorption of CH4, CO2, N2O by the soil cover has been analyzed. Original diagrams are presented showing the global fluxes of CH4, CO2, N2O by various ecosystems, including the pedosphere. The estimation of methane emission and distribution of its content in the main types of soils of the Rostov region is carried out. The mechanisms of CH4, CO2, N2O generation in soils and their possible influence on the calcium-carbonate balance, which plays an important role in the regulation of biogeochemical processes in the pedosphere, are considered. The performed analysis and generalization of research data on various types of soils makes it possible to shed light not only on their contribution to the global methane emission, but also to approach the understanding of processes and parameters that are important from the point of view of agrochemistry, such as, in fact, carbonate-calcium equilibrium and redox potential in modern soils. An inventory of sources and an assessment of the inter-reservoir gas mass transfer in the pedosphere - atmosphere system allows one to start developing a strategy to reduce greenhouse gas emissions that will help curb the rate of global climate change.

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Transmission Electron Microscopy of oriented Co84Cr14Ta2 thin films for longitudinal magnetic recording

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100088099 ◽

1991 ◽

Vol 49 ◽

pp. 756-757

Author(s):

T. P. Nolan

Keyword(s):

Thin Film ◽

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Low Cost ◽

Low Noise ◽

Information Storage ◽

High Coercivity ◽

Magnetic Alloy ◽

Magnetic Media ◽

Transmission Electron

Thin film magnetic media are being used as low cost, high density forms of information storage. The development of this technology requires the study, at the sub-micron level, of morphological, crystallographic, and magnetic properties, throughout the depth of the deposited films. As the microstructure becomes increasingly fine, widi grain sizes approaching 100Å, the unique characterization capabilities of transmission electron microscopy (TEM) have become indispensable to the analysis of such thin film magnetic media.Films were deposited at 225°C, on two NiP plated Al substrates, one polished, and one circumferentially textured with a mean roughness of 55Å. Three layers, a 750Å chromium underlayer, a 600Å layer of magnetic alloy of composition Co84Cr14Ta2, and a 300Å amorphous carbon overcoat were then sputter deposited using a dc magnetron system at a power of 1kW, in a chamber evacuated below 10-6 torr and filled to 12μm Ar pressure. The textured medium is presently used in industry owing to its high coercivity, Hc, and relatively low noise. One important feature is that the coercivity in the circumferential read/write direction is significandy higher than that in the radial direction.

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