Preprints
https://doi.org/10.5194/egusphere-2022-852
https://doi.org/10.5194/egusphere-2022-852
 
24 Oct 2022
24 Oct 2022
Status: this preprint is open for discussion.

Conceptual models of dissolved carbon fluxes considering interannual typhoon responses under extreme climates in a two-layer stratified lake

Hao-Chi Lin1, Keisuke Nakayama2, Jeng-Wei Tsai3, and Chih-Yu Chiu4 Hao-Chi Lin et al.
  • 1Department of Geography, National Taiwan University, Taipei City, Taiwan
  • 2Graduate School of Engineering, Kobe University, Kobe City, Japan
  • 3Department of Biological Science and Technology, China Medical University, Taichung City, Taiwan
  • 4Biodiversity Research Center, Academia Sinica, Taipei City, Taiwan

Abstract. Extreme climates affect the seasonal and interannual patterns of carbon (C) distribution due to the regimes of river inflow and thermal stratification within lentic ecosystems. Typhoons rapidly load substantial amounts of terrestrial C into subtropical small lakes, renewing and mixing the water column. We developed conceptual dissolved C models and hypothesized that allochthonous C loading and river inflow intrusion may affect the dissolved inorganic C (DIC) and dissolved organic C (DOC) distributions in a small subtropical lake under these extreme climates. A two-layer conceptual C models was developed to explore how the DIC and DOC fluxes respond to typhoon disturbances on seasonal and interannual time scales in a small subtropical lake (i.e., Yuan‒Yang Lake) while simultaneously considering autochthonous processes such as algal photosynthesis, remineralization, and vertical transportation. Monthly field samplings were conducted to measure DIC, DOC, and chlorophyll a concentrations to compare the temporal patterns of fluxes between typhoon years (2015–2016) and non-typhoon years (2017–2018). The results demonstrated that net ecosystem production was 3.14 times higher in the typhoon years than in the non-typhoon years in Yuan‒Yang Lake. The results suggested that the load of allochthonous C was the most crucial factor affecting the temporal variation of C fluxes in the typhoon years; on the other hand, the transportation rate shaped the seasonal C in the non-typhoon years due to thermal stratification within this small subtropical lake.

Hao-Chi Lin et al.

Status: open (until 28 Dec 2022)

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Hao-Chi Lin et al.

Hao-Chi Lin et al.

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Short summary
We successfully developed conceptual models to know how the dissolved carbon distributions under the climate change within a subtropical small lake, considering the physical and biochemical processes. The typhoons were crucial disturbances in subtropical ecosystems, controlling the seasonal variation and primary production due to large amounts of carbon loading and rapidly well-mixing within the whole-lake. whole lake.