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. CO2 efflux at the water–air interface is an essentialcomponent of the riverine carbon cycle. However, the lack of spatiallyresolved CO2 emission measurements prohibits reliable estimation of theglobal riverine CO2 emissions. By deploying floating chambers, seasonalchanges in river water CO2 partial pressure (pCO2) and CO2emissions from the Dong River in south China were investigated. Spatialand temporal patterns of pCO2 were mainly affected by terrestrial carboninputs (i.e., organic and inorganic carbon) and in-stream metabolism, bothof which varied due to different land cover, catchment topography, andseasonality of precipitation and temperature. Temperature-normalized gastransfer velocity (k600) in small rivers was 8.29 ± 11.29 and 4.90 ± 3.82 m d−1 for the wet season and dry season,respectively, which was nearly 70 % higher than that of large rivers(3.90 ± 5.55 m d−1 during the wet season and 2.25 ± 1.61 m d−1 during the dry season). A significant correlation was observedbetween k600 and flow velocity but not wind speed regardless of riversize. Most of the surveyed rivers were a net CO2 source while exhibitingsubstantial seasonal variations. The mean CO2 flux was 300.1 and 264.2 mmol m−2 d−1 during the wet season for large and small rivers,respectively, 2-fold larger than that during the dry season. However, nosignificant difference in CO2 flux was observed between small and largerivers. The absence of commonly observed higher CO2 fluxes in smallrivers could be associated with the depletion effect caused by abundant andconsistent precipitation in this subtropical monsoon catchment.

biogeosciences

Spatial and temporal variability of &amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; emissions from the Dong River in south China