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Using the Project Eddie Module “Paleoclimate and Ocean Biogeochemistry” in the Upper-Division Undergraduate Course “Climate and the Earth System”

Author(s): Alessandro Zanazzi

Utah Valley University

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Summary:
Students explore and compare datasets on modern nutrient concentrations and productivity, as well as paleo datasets to try to answer the question: “How does primary productivity influence global climate at glacial-interglacial timescales?”

Licensed under CC Attribution-ShareAlike 4.0 International according to these terms

Version 1.0 - published on 26 Apr 2023 doi:10.25334/5BMH-Y420 - cite this

Adapted from: Paleoclimate and Ocean Biogeochemistry (Project EDDIE) v 1.0

Description

Students first explore maps of the modern concentration of macronutrients (N and P), of the Redfield ratio, and of chlorophyll in the world oceans to identify the high nutrient low chlorophyll areas. Subsequently, they work with paleodatasets on productivity from the Southern Ocean and from the Equatorial Pacific, atmospheric pCO2 from ice core bubbles, benthic foraminifera oxygen isotope ratios, authigenic Uranium to investigate connections between ocean productivity, atmospheric chemistry, temperature, and ice volume at glacial-interglacial timescales. Students focus on developing hypothesis about these connections, on creating scatter and time-series plots, on comparing datasets, and on calculating correlation coefficients and p-values.

Notes

Originally, I planned to make only very small adaptations to the module material. After skimming through the module, I liked the way the material was organized and prepared. I simply planned to give some additional instructions to the students in the handout about how to use Excel to make plots and how to use its Data Analysis ToolPack. However, before implementing the module, I went through the material more carefully and read the literature that was associated with the module. Something did not make sense. In the ppt slides that came with the module it was implied that alkanes were used as a proxy for marine primary productivity. In contrast, the articles reported that alkanes are a proxy for terrestrial inputs. I therefore contacted the author of the module (Dr. Allison Jacobel) and she realized that she included in the module the alkane dataset of Martinez-Garcia et al (2011) instead of the alkenone one of Martinez-Garcia et al (2014). Therefore, I corrected the slides and substituted the Martinez-Garcia et al (2011) dataset with that of Martinez-Garcia et al (2014). Allison also contacted the Project Eddie staff and requested the correction of the module in the website. The module has now the right datasets. The conclusions of the module did not change substantially.      

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