scholarly journals Oxygen anomaly in near surface carbon dioxide reveals deep stratospheric intrusion

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Mao-Chang Liang ◽  
Sasadhar Mahata
Keyword(s):  
Carbon Dioxide ◽  
Near Surface ◽  
Surface Carbon ◽  
Stratospheric Intrusion

scholarly journals Near Surface Carbon Dioxide and Methane in Urban Areas of Costa Rica

2015 ◽  
Vol 04 (04) ◽  
pp. 208-223 ◽  
Author(s):  
Germain Esquivel-Hernández ◽  
Mario Villalobos-Forbes ◽  
Ricardo Sánchez-Murillo ◽  
Christian Birkel ◽  
Juan Valdés-González ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Costa Rica ◽  
Urban Areas ◽  
Near Surface ◽  
Surface Carbon

scholarly journals Humidity Measurement in Carbon Dioxide with Capacitive Humidity Sensors at Low Temperature and Pressure

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2615 ◽  
Author(s):  
Andreas Lorek ◽  
Jacek Majewski
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Sensor Calibration ◽  
Humidity Sensors ◽  
Near Surface ◽  
Adsorption Sites ◽  
Carbon Dioxide Gas ◽  
Individual Calibration ◽  
German Aerospace ◽  
Available Information

In experimental chambers for simulating the atmospheric near-surface conditions of Mars, or in situ measurements on Mars, the measurement of the humidity in carbon dioxide gas at low temperature and under low pressure is needed. For this purpose, polymer-based capacitive humidity sensors are used; however, these sensors are designed for measuring the humidity in the air on the Earth. The manufacturers provide only the generic calibration equation for standard environmental conditions in air, and temperature corrections of humidity signal. Because of the lack of freely available information regarding the behavior of the sensors in CO2, the range of reliable results is limited. For these reasons, capacitive humidity sensors (Sensirion SHT75) were tested at the German Aerospace Center (DLR) in its Martian Simulation Facility (MSF). The sensors were investigated in cells with a continuously humidified carbon dioxide flow, for temperatures between −70 °C and 10 °C, and pressures between 10 hPa and 1000 hPa. For 28 temperature–pressure combinations, the sensor calibration equations were calculated together with temperature–dependent formulas for the coefficients of the equations. The characteristic curves obtained from the tests in CO2 and in air were compared for selected temperature–pressure combinations. The results document a strong cross-sensitivity of the sensors to CO2 and, compared with air, a strong pressure sensitivity as well. The reason could be an interaction of the molecules of CO2 with the adsorption sites on the thin polymeric sensing layer. In these circumstances, an individual calibration for each pressure with respect to temperature is required. The performed experiments have shown that this kind of sensor can be a suitable, lightweight, and relatively inexpensive choice for applications in harsh environments such as on Mars.

Background component of carbon dioxide concentration in the near-surface air

2014 ◽  
Vol 50 (6) ◽  
pp. 576-582 ◽  
Author(s):  
V. N. Aref’ev ◽  
N. Ye. Kamenogradsky ◽  
F. V. Kashin ◽  
A. V. Shilkin
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Concentration ◽  
Background Component ◽  
Near Surface

Temperate coastal wetland near-surface carbon storage: Spatial patterns and variability

2020 ◽  
Vol 235 ◽  
pp. 106584 ◽  
Author(s):  
Christopher J. Owers ◽  
Kerrylee Rogers ◽  
Debashish Mazumder ◽  
Colin D. Woodroffe
Keyword(s):  
Carbon Storage ◽  
Spatial Patterns ◽  
Coastal Wetland ◽  
Near Surface ◽  
Surface Carbon

scholarly journals The Brazilian developments on the Regional Atmospheric Modeling System (BRAMS 5.2): an integrated environmental model tuned for tropical areas

2016 ◽  
Author(s):  
Saulo R. Freitas ◽  
Jairo Panetta ◽  
Karla M. Longo ◽  
Luiz F. Rodrigues ◽  
Demerval S. Moreira ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
South America ◽  
Atmospheric Chemistry ◽  
Amazon Basin ◽  
Carbon Dioxide Concentration ◽  
Atmospheric Modeling ◽  
Tracer Transport ◽  
Regional Atmospheric Modeling System ◽  
Near Surface ◽  
Regional Atmospheric Modeling

Abstract. We present a new version of the Brazilian developments on the Regional Atmospheric Modeling System where different previous versions for weather, chemistry and carbon cycle were unified in a single integrated software system. The new version also has a new set of state-of-the-art physical parameterizations and greater computational parallel and memory usage efficiency. Together with the description of the main features are examples of the quality of the transport scheme for scalars, radiative fluxes on surface and model simulation of rainfall systems over South America in different spatial resolutions using a scale-aware convective parameterization. Besides, the simulation of the diurnal cycle of the convection and carbon dioxide concentration over the Amazon Basin, as well as carbon dioxide fluxes from biogenic processes over a large portion of South America are shown. Atmospheric chemistry examples present model performance in simulating near-surface carbon monoxide and ozone in Amazon Basin and Rio de Janeiro megacity. For tracer transport and dispersion, it is demonstrated the model capabilities to simulate the volcanic ash 3-d redistribution associated with the eruption of a Chilean volcano. Then, the gain of computational efficiency is described with some details. BRAMS has been applied for research and operational forecasting mainly in South America. Model results from the operational weather forecast of BRAMS on 5 km grid spacing in the Center for Weather Forecasting and Climate Studies, INPE/Brazil, since 2013 are used to quantify the model skill of near surface variables and rainfall. The scores show the reliability of BRAMS for the tropical and subtropical areas of South America. Requirements for keeping this modeling system competitive regarding on its functionalities and skills are discussed. At last, we highlight the relevant contribution of this work on the building up of a South American community of model developers.

In situ Mineralization of Dairy Cattle Manures as Determined using Soil-Surface Carbon Dioxide Fluxes

2006 ◽  
Vol 70 (3) ◽  
pp. 744-752 ◽  
Author(s):  
Philippe Rochette ◽  
Denis A. Angers ◽  
Martin H. Chantigny ◽  
Bernard Gagnon ◽  
Normand Bertrand
Keyword(s):  
Carbon Dioxide ◽  
Dairy Cattle ◽  
Soil Surface ◽  
Carbon Dioxide Fluxes ◽  
Surface Carbon
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