scholarly journals Chemical Cycling in the Venusian Atmosphere: A Full Photochemical Model From the Surface to 110 km

2020 ◽  
Vol 125 (7) ◽  
Author(s):  
C. J. Bierson ◽  
X. Zhang
Keyword(s):  
Photochemical Model ◽  
Chemical Cycling ◽  
Venusian Atmosphere

Zooplankton Biogeochemical Cycles

2017 ◽  
Author(s):  
Deborah Steinberg
Keyword(s):  
North Atlantic ◽  
North Atlantic Ocean ◽  
Significant Proportion ◽  
Biogeochemical Cycles ◽  
Biological Pump ◽  
The North ◽  
Particle Export ◽  
Chemical Cycling ◽  
Cycling Of Nutrients ◽  
Planktonic Communities

The structure of planktonic communities profoundly affects particle export and sequestration of organic material (the biological pump) and the chemical cycling of nutrients. This chapter describes the integral and multifaceted role zooplankton (both protozoan and metazoan) play in the export and cycling of elements in the ocean, with an emphasis on the North Atlantic Ocean and adjacent seas. Zooplankton consume a significant proportion of primary production across the world's oceans, and their metabolism plays a key role in recycling carbon, nitrogen, and other elements. The chapter also addresses how human or climate-influenced changes in North Atlantic zooplankton populations may in turn drive changes in zooplankton-mediated biogeochemical cycling.

scholarly journals The Case (or Not) for Life in the Venusian Clouds

Life ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 255
Author(s):  
Dirk Schulze-Makuch
Keyword(s):  
Natural Selection ◽  
Environmental Conditions ◽  
Cloud Layer ◽  
Harsh Conditions ◽  
Venusian Atmosphere

The possible detection of the biomarker of phosphine as reported by Greaves et al. in the Venusian atmosphere stirred much excitement in the astrobiology community. While many in the community are adamant that the environmental conditions in the Venusian atmosphere are too extreme for life to exist, others point to the claimed detection of a convincing biomarker, the conjecture that early Venus was doubtlessly habitable, and any Venusian life might have adapted by natural selection to the harsh conditions in the Venusian clouds after the surface became uninhabitable. Here, I first briefly characterize the environmental conditions in the lower Venusian atmosphere and outline what challenges a biosphere would face to thrive there, and how some of these obstacles for life could possibly have been overcome. Then, I discuss the significance of the possible detection of phosphine and what it means (and does not mean) and provide an assessment on whether life may exist in the temperate cloud layer of the Venusian atmosphere or not.

scholarly journals Did Lomonosov see the Venusian atmosphere?

Physics Today ◽  
2012 ◽  
Vol 65 (11) ◽  
pp. 11-12 ◽  
Author(s):  
Jay M. Pasachoff ◽  
William Sheehan
Keyword(s):  
Venusian Atmosphere

scholarly journals The 2.5 THz heterodyne spectrometer THOMAS: Measurement of OH in the middle atmosphere and comparison with photochemical model results

2000 ◽  
Vol 105 (D17) ◽  
pp. 22211-22223 ◽  
Author(s):  
Christoph R. Englert ◽  
Birger Schimpf ◽  
Manfred Birk ◽  
Franz Schreier ◽  
Michael Krocka ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Photochemical Model ◽  
Heterodyne Spectrometer

Solute-specific pore water irrigation: Implications for chemical cycling in early diagenesis

2005 ◽  
Vol 63 (3) ◽  
pp. 601-621 ◽  
Author(s):  
Christof Meile ◽  
Peter Berg ◽  
Philippe Van Cappellen ◽  
Kagan Tuncay
Keyword(s):  
Pore Water ◽  
Early Diagenesis ◽  
Chemical Cycling

Liquids and solids on the surface of Titan: results of a new photochemical model

1994 ◽  
Vol 42 (1) ◽  
pp. 5-14 ◽  
Author(s):  
L.M. Lara ◽  
R.D. Lorenz ◽  
R. Rodrigo
Keyword(s):  
Photochemical Model
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