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NASA Goddard Space Flight Center is developing an active laser approach for global atmospheric CO2 concentration measurement from space as a candidate for NASA's future mission ASCENDS - the Active Sensing of CO2 Emissions over Nights, Days, and Seasons. This pulsed laser approach provides several advantages with respect to passive approaches and other laser techniques toward high-precision CO2 concentration...
Accurate global measurements of tropospheric Carbon Dioxide abundance to the “parts per million” (ppm) level is required to better quantify processes that regulate CO2 exchange between atmosphere, land and ocean. To measure CO2 globally NASA has planned the ASCENDS mission, Active Sensing of CO2 Emissions over Nights, Days and Seasons. We report on an airborne laser-based remote sensing instrument...
A measurement technique is presented that demonstrates the ability to thermally sound the atmosphere from cloud-top in the troposphere to the upper mesosphere with nadir observations using a Doppler modulated gas correlation (DMGC) approach. It is shown that DMGC measurements of CO2 emission at 15 μm can achieve an effective spectral resolution of <;0.002 cm-1, which can be used to generate averaging...
The paper presents the results of the experiment CAPMOS'05 performed on an offshore oceanographic platform in the Black Sea in June 2005. Measurements on the platform were carried during June 2-20 round a clock. A set of meteorological and oceanographic parameters was measured: water and air temperature and water salinity at several levels, sea current vectors at various depths, turbulence in sea...
Variation in soil temperature can account for most of the seasonal and diel variation in soil CO2 flux, but the temperature effect is not consistent in the intertidal zone, and other factors such as redox potential are known to influence CO2 flux. The objectives of this research were to study the temporal variation in CO2 flux between sediment and atmosphere in an intertidal zone and to evaluate temperature...
In the dormitories of universities, the indoor air quality (IAQ) is especial concern, which greatly affects the learning efficiency and students' physical and mental health. In order to improve the IAQ of student dormitories, the present characteristics of IAQ should be investigated. In this paper, the measurement of the IAQ was conducted in student dormitories on a campus in Chongqing. The investigation...
This paper presents a method to detect both fire produced gas and soot particles in the environmental air. CO gas and soot particles in fire smoke can both produce photoacoustic (PA) signal due to their light absorption. In this method, different light sources were used to excite PA signal from the two absorbers. CO gas has narrow absorption lines, while soot absorbs light in wide range of infrared...
In order to better understand the budget of carbon dioxide in the Earth's atmosphere it is necessary to develop a global high precision understanding of the carbon dioxide column. To uncover the ldquomissing sinkrdquo that is responsible for the large discrepancies in the budget as we presently understand it, calculation has indicated that measurement accuracy of 1 ppm is necessary. Because typical...
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