Supplementary materials: "Where and when the mesopelagic carbon budget balances, if at all", Oliver et al.

Data Supplement to "Where and when the mesopelagic carbon budget balances, if at all"

Sophy Oliver(1), Andrew Yool(1), Stephanie A. Henson(1), Adrian P. Martin(1)

1 National Oceanography Centre, Southampton SO14 3ZH, UK

Corresponding author: Sophy Oliver, [e-mail]

This data supplement contains results using the MOPS biogeochemical model (Kriest et al. 2015).

-> Model_ep_npp_MLD (MATLAB files required to create Figure S1 and S10)

-> NPP.mat: MOPS annually-averaged net primary production [mmol P / m3 / d]

-> EP.mat: MOPS annually-averaged export production [mmol P / m3 / d]

-> MLDinterp.mat: annual maximum of monthly-averaged mixed layer depth [m] in ECCO: 1992-2001 mean (Fukumori et al. 2023). The mixed layer depth is determined by the depth where waters are first 0.8°C colder than the near-surface, as per the Kara Formula (Kara, Rochford, and Hurlburt 2000).

-> DOPAVG.mat: MOPS monthly-averaged dissolved organic phosphate (DOP) [mmol P / m3]

-> Model_Budget_Components (MATLAB files required to create Figures 1 and S2-9)

-> Flux.mat: Monthly-averaged particulate flux sinking into the top of each depth level [mmol P / m2 / d]. Note that depth level 1 corresponds to flux to the sea floor (burial).

-> Drem.mat: Monthly-averaged remineralisation and denitrification of particulate matter [mmol P / m3 / d]

-> DOPnew.mat: Monthly-averaged creation of dissolved organic phosphate by dying plankton [mmol P / m3 / d] 

-> DOPrem.mat: Monthly-averaged remineralisation and denitrification of dissolved organic phosphate [mmol P / m3 / d]

-> det_vt.mat: Monthly-averaged change in particulate organic phosphate after vertical transport is applied [mmol P / m3 / d]

-> det_ht.mat: Monthly-averaged change in particulate organic phosphate after horizontal transport is applied [mmol P / m3 / d]

-> dop_vt.mat: Monthly-averaged change in dissolved organic phosphate after vertical transport is applied [mmol P / m3 / d]

-> dop_ht.mat: Monthly-averaged change in dissolved organic phosphate after vertical transport is applied [mmol P / m3 / d]

-> Code_Analysis_Plotting

-> plot_npp.m: MATLAB script to plot Figure S1 of the supplementary figures of MOPS net primary and export production, and ECCO mixed layer depth.

-> meso_monthly_budget.m: MATLAB script to calculate and plot the global seasonal mesopelagic organic carbon budget and its components (Figures 1 and S2-9 and S11).

-> plot_doc.m: MATLAB script to plot Figure S10 of the supplementary figures of MOPS annually averaged DOC [µmol C kg-1] at 15m, 310m, and 610m depth.

-> bluewhitered.mat: MATLAB colorscale.

Model grid information for MITgcm_ECCO can be found here: http://kelvin.earth.ox.ac.uk/spk/Research/TMM/TransportMatrixConfigs/ (Samar Khatiwala, University of Oxford).