Biological production in the Indian Ocean upwelling zones –Part 1: refined estimation via the use of a variable compensation depth in ocean carbon models
| Autor: | Vinu Valsala, Mohanan Geethalekshmi Sreeush, Koneru Venkata Siva Rama Prasad, Sreenivas Pentakota, Raghu Murtugudde |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences lcsh:Life chemistry.chemical_element Atmospheric sciences 01 natural sciences Carbon cycle lcsh:QH540-549.5 medicine Production (economics) Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes 010604 marine biology & hydrobiology lcsh:QE1-996.5 Seasonality New production medicine.disease lcsh:Geology Variable (computer science) lcsh:QH501-531 chemistry Environmental science Upwelling lcsh:Ecology Carbon Carbonate compensation depth |
| Zdroj: | Biogeosciences, Vol 15, Pp 1895-1918 (2018) |
| ISSN: | 1726-4189 |
| Popis: | Biological modelling approach adopted by the Ocean Carbon-Cycle Model Intercomparison Project (OCMIP-II) provided amazingly simple but surprisingly accurate rendition of the annual mean carbon cycle for the global ocean. Nonetheless, OCMIP models are known to have seasonal biases which are typically attributed to their bulk parameterisation of compensation depth. Utilising the criteria of surface Chl a-based attenuation of solar radiation and the minimum solar radiation required for production, we have proposed a new parameterisation for a spatially and temporally varying compensation depth which captures the seasonality in the production zone reasonably well. This new parameterisation is shown to improve the seasonality of CO2 fluxes, surface ocean pCO2, biological export and new production in the major upwelling zones of the Indian Ocean. The seasonally varying compensation depth enriches the nutrient concentration in the upper ocean yielding more faithful biological exports which in turn leads to accurate seasonality in the carbon cycle. The export production strengthens by ∼ 70 % over the western Arabian Sea during the monsoon period and achieves a good balance between export and new production in the model. This underscores the importance of having a seasonal balance in the model export and new productions for a better representation of the seasonality of the carbon cycle over upwelling regions. The study also implies that both the biological and solubility pumps play an important role in the Indian Ocean upwelling zones. |
| Databáze: | OpenAIRE |
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