Mesopause region temperature variability and its trend in southern Brazil

Venturini, Mateus Schmitz; Bageston, José Valentin; Caetano, Nattan Roberto; Peres, Lucas Vaz; Benchérif, Hassan; Schuch, Nelson Jorge

doi:10.5194/angeo-36-301-2018

Cited by 7 publications

(5 citation statements)

References 28 publications

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“…Despite the short period of data considered here, the results for Cachoeira Paulista are qualitatively consistent with those of Huang et al () that, using data from SABER instrument obtained between 2002 and 2014, have found a positive temperature response at 80‐ to 100‐km height to solar variability for 48°N to 48°S latitude range, but the period of 13 years is not long enough to establish reliable trends. Venturini et al () have used SABER temperature to investigate MLT temperature variability and its trend in Brazilian southern (29.7°S) and founded a positive trend of 0.58 K per decade at 85 km, a negative trend of 0.02 K per decade at 90 km, and another positive trend of 0.41 K per decade at 95 km, from 2003 to 2014 (12 years), concluding that there is no variability tendency in MLT temperature. The authors also have noted that during years of maximum solar the temperature's amplitude is twice the amplitude of the year of solar minimum, deducing that amplitudes of annual and semiannual variation are directly influenced by the solar cycle.…”

Section: Discussionmentioning

confidence: 99%

Meteor Radar Temperatures Over the Brazilian Low‐Latitude Sectors

2018

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Meteor radar observations have been used to estimate the mesospheric temperatures at 90‐km height over the Brazilian low‐latitude sectors by applying gradient‐ and pressure‐based techniques. The measurements have been taken from meteor radars operating at Cachoeira Paulista (22.7°S, 45°W), from 2002 to 2006, and São João do Cariri (7.4°S, 36.5°W), between mid‐2004 and 2008. The temperatures estimated from meteor data by the two techniques, using local models for temperature gradient and pressure, showed a good agreement with temperatures from Sounding of the Atmosphere by Broadband Emission Radiometry over both sites. The seasonal behavior of the temperatures estimated from meteor data, and from Sounding of the Atmosphere by Broadband Emission Radiometry instrument, is characterized by a semiannual oscillation (SAO) with maximum values during equinoxes, which coincide with the westward phase of the mean zonal wind as well as with SAO on diurnal tidal amplitudes over both sites. The lag phases between SAO on temperatures and on winds (or on diurnal tidal amplitudes), near equator, have been stable in time indicating a seasonal cycle and the dynamic coupling of the tropical mesosphere through nonlinear interactions between oscillations from stratosphere. Although the time series used are short to establish reliable trends or solar effects, the temperatures over Cachoeira Paulista showed a decrease between 2003 and 2006, just when F10.7 index has declined in a rate of 15.3 sfu/year, while over São João do Cariri only a slight decay has been observed on temperatures by gradient technique obtained from mid‐2004 to 2008, when F10.7 decrease rate was 9.2 sfu/year.

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Section: Discussionmentioning

confidence: 99%

Meteor Radar Temperatures Over the Brazilian Low‐Latitude Sectors

2018

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“…[56,57] Among all the zeolites that are used contemporarily for industrial purposes, zeolite Y (faujasite, FAU) has been one of the most extensively used materials. [58][59][60] Hydrothermal synthesis is the primary method for preparing zeolite Y. It is a natural process which efficiently produces various classes of minerals such as crystalline silica and zeolites.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zeolite Y from green materials

et al. 2021

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Several probes have been conducted by the scientific community to reduce emissions of greenhouse gases such as carbon dioxide (CO 2 ). A zeolitic material is capable of CO 2 adsorption with the aid of such technologies. Our present work is to efficiently synthesize zeolite Y with four Si/Al ratios (2.0, 2.5, 3.0, and 3.5) from green materials such as rice husk ash (source of Si) and metakaolin (source of Al). The method for preparing zeolite Y involves hydrothermal synthesis in a hydrodynamic reactor at 120 C temperature, for a reaction time of 24 hours. These synthetic zeolites represent high values for surface area as well as pore volume in micropore range and are compatible with the size of CO 2 molecules. The zeolite Y (with Si/Al ratio 3.5) has an absorption capacity of 3.35 mmol CO 2 /g at (900 kPa) pressure, thereby

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“…The practical use of hydrated ethanol represents an essential factor for the reducing costs related to the energy consumed in the process (Venturini et al, 2018;Tura et al, 2018;Matugi et al, 2018;Robertson and Pavlath, 1985;Fagundez et al, 2017;Cataluña et al, 2017). The production of first and second-generation ethanol in the same industrial plant presents better financial results compared to the isolated processes (Silva et al, 2017;Caetano et al, 2015b;Dias et al, 2012;Ojeda et al, 2011;Seabra et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Energetic and Economic Analysis of Use of Hydrated Ethanol

Ruoso¹,

Lhamby²,

Missaggia³

et al. 2020

PTQ

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Interest in biofuels is growing, and ethanol has been the most used biofuel as an additive and as a gasoline substitute and, it is considered a potential alternative to traditional fuels. Ethanol represents 17% of energy consumption in transportation in Brazil, the transport sector's share in the energy matrix is 32.4%, which is the second most energy-consuming sector. The production of first and second-generation ethanol in the same industrial plant presents better financial results compared to the isolated processes. Also, ethanol obtained from the sugarcane has renewability, biodegradability and provides CO2 emissions mitigation. The objective of the work is to perform an analysis of the ethanol with several levels of hydration in terms of energetic, economic, environmental and safety. The results showed that each 10% of water in ethanol dilution the temperature in the flame surround decreases by 4%. Besides, the ethanol with 20% of water dilution emits 20% less radiation compared to 10% of water dilution. Indeed, the energy consumed in the distillation to produce ethanol with 10% of water is double. On the other hand, this energy difference in the production of ethanol diluted with 30% of water is not enough to compensate for the losses in the energy use process. Also, large amounts of water in ethanol dilution might be unfeasible the use due to the total cost of transportation. Therefore, ethanol with 20% of water represents the more efficient, cleaner and safe fuel in free flame applications.

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Mesopause region temperature variability and its trend in southern Brazil

Cited by 7 publications

References 28 publications

Meteor Radar Temperatures Over the Brazilian Low‐Latitude Sectors

Meteor Radar Temperatures Over the Brazilian Low‐Latitude Sectors

Hydrothermal synthesis of zeolite Y from green materials

Energetic and Economic Analysis of Use of Hydrated Ethanol

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