Abstract
Peatlands play an important role in the global carbon cycle due to the high carbon storage in the substrate. Ecosystem production depends, for example, on the solar energy amount that reaches the vegetation, however the diffuse component of this flux can substantially increase ecosystem net productivity. This phenomenon is observed in different ecosystems, but the study of the atmosphere optical properties on peatland production is lacking. In this paper, the presented methodology allowed us to disentangle the diffuse radiation impact on the net ecosystem production (NEP) of Rzecin peatland, Poland. It allowed us to assess the impact of the atmospheric scattering process determined by the aerosol presence in the air mass. An application of atmospheric radiation transfer (ART) and ecosystem production (EP) models showed that the increase of aerosol optical thickness from 0.09 to 0.17 caused NEP to rise by 3.4–5.7%. An increase of the diffusion index (DI) by 0.1 resulted in an NEP increase of 6.1–42.3%, while a DI decrease of 0.1 determined an NEP reduction of −49.0 to −10.5%. These results show that low peatland vegetation responds to changes in light scattering. This phenomenon should be taken into account when calculating the global CO2 uptake estimation of such ecosystems.
Highlights
The interaction between terrestrial ecosystems and the Earth’s atmosphere is one of the most critical ecological issues, since the properties of the atmosphere determine each ecosystem’s sustainability, development, or extinction [1]
Only data collected during the period from 24 to 38 weeks were taken into analysis due to the lack of aerosol optical thickness (AOT) observation during week 39, so the analyzed data covered the period from
The complex character of the interaction between the ecosystems and atmospheric conditions required the application of models that provided the basis for the deconvolving of single factors, e.g., aerosol and/or cloud impact on ecosystem production
Summary
The interaction between terrestrial ecosystems and the Earth’s atmosphere is one of the most critical ecological issues, since the properties of the atmosphere determine each ecosystem’s sustainability, development, or extinction [1]. The water and carbon dioxide balances of the biosphere are determined by both biotic and abiotic factors, and their global cycles are efficiently controlled by the solar energy that flows throughout the. Changes in the physical properties of the atmosphere determine the fate of the ecosystems, and their carbon balance are important issues in the context of the greenhouse effect phenomenon. Earth surface-atmosphere CO2 exchange is strongly related to photosynthesis and respiration rates. Both processes depend directly and indirectly on the total (SWin) solar radiation (the sum of direct (SWdir) and Remote Sens.
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