نتایج جستجو برای: has exerted significant impacts on biosphere methane
تعداد نتایج: 9594313 فیلتر نتایج به سال:
Phosphine (PH 3 ) is proposed to be a possible biomarker in planetary atmospheres and has been claimed have observed the atmosphere of Venus, sparking interest habitability Venus’s atmosphere. Observations another biomarker, methane (CH 4 ), reported several times Mars, hinting at possibility past or present biosphere. The Atmospheric Chemistry Suite on ExoMars Trace Gas Orbiter spectral range ...
Methane is thought to have been an important greenhouse gas during the Archean, although its potential warming has found be limited at high concentrations due shortwave absorption. We use Met Office Unified Model, a general circulation model, further explore climatic effect of different Archean methane concentrations. Surface peaks pressure ratio pCH4:pCO2 approximately 0.1, reaching maximum up...
An attempt has been made to estimate methane fluxes from a tropical coastal wetland the Vembanad Lake, a lagoon along the West Coast of India. It has been found that Vembanad Lake contributes significant amount of methane to the atmosphere. Average emissions varied spatially within the lake. Methane emissions were 193.2 +/- 24.5 mg m(-2) h(-1) at Kumaragam (fresh water) as compared to 9.3 +/- 9...
the central purpose of this study was to conduct a case study about the role of self monitoring in teacher’s use of motivational strategies. furthermore it focused on how these strategies affected students’ motivational behavior. although many studies have been done to investigate teachers’ motivational strategies use (cheng & d?rnyei, 2007; d?rnyei & csizer, 1998; green, 2001, guilloteaux & d?...
In the last century impacts of human activity on natural processes that sustain Earth’s biosphere, atmosphere, hydrosphere and lithosphere provide bedrock life support...
In modern marine sediments, the anoxic decomposition of organic matter generates a significant flux of methane that is oxidized microbially with sulphate under the seafloor and never reaches the atmosphere. In contrast, prior to ca 2.4Gyr ago, the ocean had little sulphate to support anaerobic oxidation of methane (AOM) and the ocean should have been an important methane source. As atmospheric ...
The deep sea is Earth's largest habitat but little is known about the nature of deep-sea parasitism. In contrast to a few characterized cases of bacterial and protistan parasites, the existence and biological significance of deep-sea parasitic fungi is yet to be understood. Here we report the discovery of a fungus-related parasitic microsporidium, Nematocenator marisprofundi n. gen. n. sp. that...
This study quantitatively estimates the spatial distribution of anthropogenic methane sources in the United States by combining comprehensive atmospheric methane observations, extensive spatial datasets, and a high-resolution atmospheric transport model. Results show that current inventories from the US Environmental Protection Agency (EPA) and the Emissions Database for Global Atmospheric Rese...
adsorbed natural gas has various advantages and is relatively more economical than liquefaction and compression. carbon nanotubes can be introduced as a new candidate for natural gas storage. in this study, adsorption of methane was firstly studied on the as-prepared multi-walled carbon nanotubes, and then chemical and physical treatment of mwcnts was performed to enhance the methane adsorption...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید