greenhouse gas Archives - Page 3 of 3 - Astrobiology

Concept figure illustrating a hypothetical Earth-like inhabited planet terraformed with various combined abundances of artificial greenhouse gases C3F8, C2F6, and SF6 and its resulting qualitative mid-infrared transmission (top) and emission (bottom) spectra. The figure conveys the anomalously high absorption opacity that may be detected when characterizing an exoplanet whose climate is modified by these artificial gases, which span the key mid-infrared window wavelengths. (Graphic artist: Sohail Wasif, UC Riverside). -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Habitable Zones, Imaging & Spectroscopy, SETI & Technosignatures, Status Report

Artificial Greenhouse Gases as Exoplanet Technosignatures

by Keith CowingMay 21, 2024June 26, 2024

Atmospheric pollutants such as CFCs and NO2 have been proposed as potential remotely detectable atmospheric technosignature gases. Here we investigate the potential for artificial greenhouse gases including CF4, C2F6, C3F8, […]

Methane clathrate (white, ice-like material) under a rock from the seafloor of the northern Gulf of Mexico. Deposits such as these demonstrate that methane and other gases cross the seafloor and enter the ocean. Photo credit: NOAA

Astrogeology, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extremeophiles and Extreme Environments, Genomics, Proteomics, Bioinformatics, Press Release, ROVs/Submersibles/Diving, Water/Hycean Worlds & Oceanography

From Seafloor To Space: New Bacterial Proteins Shine Light On Climate and Astrobiology

by Keith CowingNovember 17, 2023November 17, 2023

Gigatons of greenhouse gas are trapped under the seafloor, and that’s a good thing. Around the coasts of the continents, where slopes sink down into the sea, tiny cages of […]

Responses of the atmospheric pCH4 to biogenic CH4 flux for the case of F-, G-, and Ktype stars (blue, black, and light blue solid lines with dots) (ExpCH4fluxF2V, ExpCH4fluxG2V, and ExpCH4fluxK2V in Table 3). The dotted lines represent the results of the case of the G-type star with the scaled intensity of the spectra at 200–210 nm (0.1, 0.5, 2, 10, and 40 times for purple, light purple, orange, red, and brown lines, respectively). (ExpCH4flux200nm in Table 3). -- astro-ph.EP

Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report

Controls of Atmospheric Methane on Early Earth and Inhabited Earth-like Terrestrial Exoplanets

by Keith CowingNovember 14, 2023November 14, 2023

Methane (CH4) is a primarily biogenic greenhouse gas. As such, it represents an essential biosignature to search for life on exoplanets.

Median temperature (K) differences between high and low pCO2 scenarios and median wind speeds (m s−1) for each scenario for Earth-like (a, c) and TRAPPIST-1e (b, d) ExoCAM simulations at (a, b) upper and (c, d) near-surface levels. Black and green quivers represent the high and low pCO2 scenarios, respectively. Using the Wilcoxon Rank-Sum test, lime and magenta-filled contours for wind speed and temperature represent areas not statistically significant at the 5% level, respectively. -- The Hebrew University of Jerusalem

Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Exoplanets, -moons, -comets, Habitable Zones, Press Release, TRAPPIST-1

Greenhouse Gas Supplement Increases Warming And Alters Circulation Patterns On Earth and Earth-like Exoplanets

by Keith CowingJuly 13, 2023July 13, 2023

With the launch of the James Webb Space Telescope (JWST), the study of exoplanetary atmospheres and their potential habitability reached new heights. A team of researchers led by Dr. Assaf […]

Dale Andersen and Chris McKay monitoring the atmospheric methane levels at Lake Untersee in Antarctica in December 2008 -- Dale Andersen

Analog Studies, Arctic / Antarctic / Alpine, Atmospheres, Climate, Weather, Away Teams & Field Reports, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Cryobiology, Dale Andersen's Field Reports, Exploration Gear & Tech, Icy Worlds, Imaging & Spectroscopy, Microbiology & Virology, Status Report, Tricorders & Sensors

In Situ Measurements of Atmospheric Methane at Lake Untersee, Antarctica

by Keith CowingDecember 24, 2008April 14, 2024

Methane (CH4) is an important greenhouse gas in the Earth’s atmosphere, accounting for approximately 20% of the observed greenhouse effect. With an atmospheric lifetime of about ten years, methane levels […]