Carbon diurnal variation

Fig. 4-2. Typical central city diurnal variation in carbon monoxide concentration, in a city in the United States. Spring (------), summer (------), fall (..), winter (----).

Diurnal Variations of Elemental Carbon from Wood Burning... 

Saha A, Despiau S (2009) Seasonal and diurnal variations of black carbon aerosols over a Mediterranean coastal zone. Atmos Res 92 27 -1... 

Grivas G, Cheristanidis S, Chaloulakou A (2012) Elemental and organic carbon in the urban environment of Athens. Seasonal and diurnal variations and estimates of secondary organic carbon. Sci Total Environ 414 535-545... 

Schmidt (1974) in the northern and southern Atlantic varied from 0.8 to 5.4 with an average of 2.5. From these data, extrapolated to other oceans, Schmidt (1974) and Seiler and Schmidt (1974b) estimated a global emission rate of 4Tg/yr. In contrast to CO, the aqueous concentrations of H2 do not undergo diurnal variations. This does not preclude a photochemical production of H2, as was shown for carbon monoxide, but other production mechanisms for hydrogen, such as by bacteria or in the digestive tracts of zooplankton, may be more effective. 

Biological processes in both the marine and terrestrial environments emit a substantial fraction of their assimilated carbon into the atmosphere as biological volatile organic compounds (BVOCs) [77], Quite a number of BVOCs have been monitored in different studies using PTR-MS. One study used BVOCs to estimate the OH radical concentration [78] PTR-MS was also used to measure the profile of several BVOCs from 35 m to 10 km and their diurnal variations in order to estimate emission fluxes from the local forest canopy [79]. 

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