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• W4221124306 abstract "&lt;p&gt;Dissolved inorganic carbon (DIC) is rarely regarded as a limiting factor of gross primary production (GPP) because atmospheric CO&lt;sub&gt;2&lt;/sub&gt; invasion is expected to compensate for the DIC demands at high GPP levels. However, from May to August, the CO&lt;sub&gt;2&lt;/sub&gt; concentrations in the surface waters of Lake Geneva, a large and deep hardwater lake, can be as low as 100 ppm, i.e. threshold values for carbon limitation of gross primary production (GPP). Because GPP values remain high during summer in Lake Geneva, we questioned whether CO&lt;sub&gt;2&lt;/sub&gt; invasion was sufficient to supply GPP in inorganic carbon, or whether additional inorganic carbon was supplied by alkalinity, through CO&lt;sub&gt;2&lt;/sub&gt; released by the background calcite precipitation. Using the paired O&lt;sub&gt;2&lt;/sub&gt;&amp;#8211;CO&lt;sub&gt;2&lt;/sub&gt; departure from the atmospheric equilibrium coupled to alkalinity data in littoral and pelagic environments, we investigated the sources of the inorganic carbon fixed by primary production, along three hypotheses. The first hypothesis (H&lt;sub&gt;1&lt;/sub&gt;) is that atmospheric CO&lt;sub&gt;2&lt;/sub&gt; invasion is sufficient to compensate for the CO&lt;sub&gt;2&lt;/sub&gt; demand. The second hypothesis (H&lt;sub&gt;2&lt;/sub&gt;) builds on H&lt;sub&gt;1&lt;/sub&gt; while including the chemical enhancement of CO&lt;sub&gt;2&lt;/sub&gt; influxes. The third hypothesis (H&lt;sub&gt;3&lt;/sub&gt;) consists in adding to H&lt;sub&gt;2&lt;/sub&gt; CO&lt;sub&gt;2&lt;/sub&gt; released by calcite precipitation. We find first that daily molar changes in DO are unrelated to daily molar changes in CO&lt;sub&gt;2&lt;/sub&gt;, but to molar changes in alkalinity for most of the warm season. For days for which we could compute GPP, we found that for GPP &lt; 30 &amp;#181;mol C L&lt;sup&gt;&amp;#8211;&lt;/sup&gt;&lt;sup&gt;1&lt;/sup&gt; d&lt;sup&gt;&amp;#8211;&lt;/sup&gt;&lt;sup&gt;1&lt;/sup&gt;, H&lt;sub&gt;1&lt;/sub&gt; and H&lt;sub&gt;2&lt;/sub&gt; are sufficient to maintain the CO&lt;sub&gt;2&lt;/sub&gt; demand, in both the littoral and pelagic habitats. Above 30 &amp;#181;mol C L&lt;sup&gt;&amp;#8211;&lt;/sup&gt;&lt;sup&gt;1&lt;/sup&gt; d&lt;sup&gt;&amp;#8211;&lt;/sup&gt;&lt;sup&gt;1&lt;/sup&gt;, even chemically enhanced CO&lt;sub&gt;2&lt;/sub&gt; invasion cannot compensate for GPP, and CO&lt;sub&gt;2&lt;/sub&gt; demand can only be meet adding CO&lt;sub&gt;2&lt;/sub&gt; supplied by alkalinity through calcite precipitation. In Lake Geneva, alkalinity could thus supply inorganic carbon to high GPP up to ~ 40% during the stratified season for littoral and pelagic primary producers.&lt;/p&gt;" @default.
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• W4221124306 date "2022-03-27" @default.
• W4221124306 modified "2023-10-18" @default.
• W4221124306 title "Alkalinity supports gross primary production in a deep hardwater lake" @default.
• W4221124306 doi "https://doi.org/10.5194/egusphere-egu22-4564" @default.
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