Perspective>Earth Sciences>Special Topic: Origin and Cycling of Volatiles in Habitable Planets Atmospheric carbon dioxide and oxygen concentrations are partially linked via the geological cycle of organic carbon (Fig. 1A–C; e.g. CO2 + H2O ↔ CH2O + O2). The history of these two biologically ...
carbon cycleecosystem fluxesO2:CO2 exchange[1] We determined O2:CO2 exchange ratios of ecosystem fluxes during field campaigns in different forest ecosystems (Harvard Forest/United States, Griffin Forest/United Kingdom, Hainich/Germany). The exchange ratios of net assimilation observed in chamber ...
P. in The Carbon Cycle (eds Wigley, T. M. L. & Schimel, D.) 134–140 (Cambridge Univ. Press, New York, 2000). Resplandy, L., Séférian, R. & Bopp, L. Natural variability of CO2 and O2 fluxes: what can we learn from centuries-long climate models simulations? J. Geophys. ...
Although the Kok cycle is of short duration, it has taken place continuously during 2.4 billion years of O2 synthesis, once for every O2 molecule ever made. There are currently about 1044 O2 molecules resident in the atmosphere, all made by the OEC, and the time required for the OEC to ...
Forests with large above- and below- ground C-pools as well as abundant bogs and wetlands, export terrestrial DOM and dissolved inorganic carbon (DIC) to waters, making boreal aquatic ecosystems an especially important component of the global carbon cycle2. In certain areas also agricultural ...
Yogesh K. Tiwari1, Dipankar Sarma1, Abhijit Bora3 & Nirmali Gogoi3 Amongst all the anthropogenically produced greenhouse gases (GHGs), carbon dioxide (CO2) and methane (CH4) are the most important, owing to their maximum contribution to the net radiative forcing of the ...
Yogesh K. Tiwari1, Dipankar Sarma1, Abhijit Bora3 & Nirmali Gogoi3 Amongst all the anthropogenically produced greenhouse gases (GHGs), carbon dioxide (CO2) and methane (CH4) are the most important, owing to their maximum contribution to the net radiative forcing of the ...
Excess oxidation of carbon creates ambient reducing power potentially available for bacterial (anaerobic) photosynthesis and chemolithotrophy.Key words: lake, respiratory quotient, oxygen deficit, carbon cycle, benthic respiration, eddy diffusion, heat budget, soft-water, detritus, ecosystem energeticsP. ...
marine carbon cycle[1]聽The contribution of the marine biota to air-sea fluxes of CO2 and O2 is often described in terms of biological production concepts, such as new production, export production, and net community production. We evaluate these three quantities using a basin-scale ecosystem-...
carbon cyclesoil respirationsoil carbon dioxideafforestationA three dimensional, time-evolving field of atmospheric potential oxygen (APO ~ Osub2/sub/Nsub2/sub + COsub2/sub) is estimated using surface Osub2/sub, Nsub2/sub and COsub2/sub fluxes from the WHOI ocean ecosystem model to force the...