- Preprint
(16689 KB) - Metadata XML
- Articles & preprints
- Submission
- Policies
- Peer review
- Editorial board
- About
- EGU publications
- Manuscript tracking
04 Jan 2021
04 Jan 2021
Abstract. While there is agreement that global warming over the 21st century is likely to influence the biological pump, Earth system models (ESM) display significant divergence in their projections of future new production. This paper quantifies and interprets the sensitivity of projected changes in new production in an idealized global ocean-biogeochemistry model. The model includes two tracers that explicitly represent nutrient transport, light- and nutrient-limited nutrient uptake by the ecosystem (new production), and export via sinking organic particles. Globally, new production declines with warming due to reduced surface nutrient availability, as expected. However, the magnitude, seasonality, and underlying dynamics of the nutrient uptake are sensitive to the light and nutrient dependencies of uptake, which we summarize in terms of a single biological timescale that is a linear combination of the partial derivatives of production with respect to light and nutrients. Although the relationships are non-linear, this biological timescale is correlated with several measures of biogeochemical function: shorter timescales are associated with greater global annual new production and higher nutrient utilization. Shorter timescales are also associated with greater declines in global new production in a warmer climate and greater sensitivity to changes in nutrient than light. Future work is needed to characterize more complex ocean biogeochemical models in terms of similar timescale generalities to examine their climate change implications.
Genevieve Jay Brett et al.
Status: open (until 15 Feb 2021)
Genevieve Jay Brett et al.
Data, Sensitivity of 21st-century projected ocean new production changes to idealized biogeochemical model structure Genevieve Jay Brett https://doi.org/10.5281/zenodo.4361701
gjayb/CESMtracer v1.0 (Version v1.0) Genevieve Jay Brett https://doi.org/10.5281/zenodo.4361705
Genevieve Jay Brett et al.
HTML | XML | Total | BibTeX | EndNote | |
---|---|---|---|---|---|
176 | 64 | 5 | 245 | 4 | 4 |
Country | # | Views | % |
---|
Total: | 0 |
HTML: | 0 |
PDF: | 0 |
XML: | 0 |
An interactive open-access journal of the European Geosciences Union