Carbon dioxide reduction by photosynthesis undetectable even during phytoplankton blooms in two lakes

[Michael Hayes]

[...] In summary, our results show that neither G. semen nor G. echinulata blooms were associated with decreases in pCO2 in two Swedish boreal lakes. It is likely that physical factors, such as wind induced water column mixing and import of inorganic carbon via groundwater inflow and runoff, suppress the phytoplankton signal on pCO2. [...]

https://www.nature.com/articles/s41598-023-40596-6?fbclid=IwAR04nC1of4KSVKB0mRxumRnUYt7Bf1TBw266RKTJ_qx137Woq9hMRUrO2z8

MH] I suspect that forest fire smoke can also add to the shut down of this natural CDR method in forest lakes as the smoke particals add ultra fine C to the water. My 15 acre lake has switched to a diatom heavy biotic mix, the lake turned from clear to brown. Not much changed over the last 30 years except far more smoke days, higher winds, warmer winters, that's all.

[Bhaskar M V]

Algae contribute to CO2 reduction only when they sink in Oceans and when they are consumed by Zooplankton and Fish. The Organic Carbon in the Zooplankton and Fish biomass is the Carbon that would be removed from the water.
G. semen and G. echinulata are perhaps not consumed by Zooplankton and Fish, so their blooms would NOT contribute to CO2 reduction.

Lakes would not be deep enough for algae to sink and store Carbon.
 

Regards

Bhaskar

[Michael Hayes]

Bhaskar, et al.,

I have a lakebed with a deep layer of black ooze that is largely C that was deposited by the microbial mix and C from small surface feeder streams. Most boreal forest lakes will have a thick layer of black C rich lakebed ooze. It's commonly called 'manure'.

[...] While the magnitude of carbon storage is not comparable to those in peatland, vegetation and soil, lake organic carbon sinks from closed basins are significant to long-term terrestrial carbon budget and contain information of climate change and human impact from the whole basins. [...]

Li, Y., Zhang, X., Xu, L. et al. Changes of lake organic carbon sinks from closed basins since the Last Glacial Maximum and quantitative evaluation of human impacts. Carbon Balance Manage 16, 28 (2021). https://doi.org/10.1186/s13021-021-00191-6

https://cbmjournal.biomedcentral.com/articles/10.1186/s13021-021-00191-6#:~:text=While%20the%20magnitude%20of%20carbon,impact%20from%20the%20whole%20basins.

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