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Nocturnal intermittency in surface CO2 concentrations in sub-Saharan Africa

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dc.contributor.authorHicks, B. B.en
dc.contributor.authorO'Dell, D. L.en
dc.contributor.authorEash, N. S.en
dc.contributor.authorSauer, Thomas J.en
dc.contributor.departmentSustainable Agriculture and Natural Resource Management (SANREM) Knowledgebaseen
dc.date.accessioned2019-06-18T03:45:58Zen
dc.date.available2019-06-18T03:45:58Zen
dc.date.issued2015-01-15en
dc.description.abstractAn exploratory study of CO2 concentrations and fluxes was conducted during 2013, at a site 12 km North of Harare, Zimbabwe. CO2 measurements were made over four adjacent fields of differing surface vegetation. The data illustrate the role of atmospheric intermittency as a mechanism for transferring CO2 between the surface and the atmosphere. At night, limited atmospheric mixing permits CO2 concentrations to increase to levels well above those conventionally reported (exceeding a spatial average of 450 ppm on some nights), but these high levels are moderated by a periodic intermittency that appears similar to that observed elsewhere and often associated with the presence of strong, synoptic-scale winds aloft (especially low-level jets). The availability of CO2 data with adequate time resolution facilitates investigation of the general behavior, which is suspected to be a common although rarely observed feature of the lower terrestrial atmosphere. If true, this means that the nocturnal vertical transfer of momentum, heat and mass is not solely through a constrained spectral continuum of turbulence as much as by intermittent bursts, propagating from above and penetrating the surface boundary layer. (C) 2014 The Authors.en
dc.format.extent129-134en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1016/j.agrformet.2014.09.007en
dc.identifier.issn0168-1923en
dc.identifier.urihttp://hdl.handle.net/10919/90208en
dc.identifier.volume200en
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.titleNocturnal intermittency in surface CO2 concentrations in sub-Saharan Africaen
dc.title.serialAGRICULTURAL AND FOREST METEOROLOGYen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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