DOI: 10.5061/dryad.k3j9kd5dt
title: UVic earth system climate model data generated under MIS3 boundary conditions

description: The modelling dataset presented here corresponds to the study entitled
 "Transient response of Southern Ocean ecosystems during Heinrich
 stadials".  Antarctic ice core records suggest that
 atmospheric CO2 increased by 15 to 20 ppm during Heinrich stadials (HS).
 These periods of abrupt CO2 increase are associated with a significant
 weakening of the Atlantic meridional overturning circulation (AMOC), and a
 warming at high southern latitudes. As such, modelling studies have
 explored the link between changes in AMOC, high southern latitude climate
 and atmospheric CO2. While proxy records suggest that the aeolian iron
 input to the Southern Ocean decreased significantly during HS, the
 potential impact on CO2 of reduced iron input combined with oceanic
 circulation changes has not been studied in detail. Here, we quantify the
 respective and combined impacts of reduced iron fertilisation and AMOC
 weakening on CO2 by performing numerical experiments with an Earth system
 model under boundary conditions representing 40,000 years before present
 (ka). The dataset here includes the complete transient simulations and
 40ka-control simulation mentioned in Table 1 and Table 2 of the
 manuscript.
description: The data is generated through modelling simulations using the
 University of Victoria Earth system climate model. 
description: # UVic earth system climate model data generated under MIS3 boundary
 conditions --- The modelling dataset presented here corresponds to the
 study entitled "Transient response of Southern Ocean ecosystems
 during Heinrich stadials". This dataset contains data files of the
 complete transient simulations (FW,FE and FWFE) and 40ka-control
 simulation mentioned in Table 1 and Table 2 of the manuscript. We first
 performed a control simulation 40ka-control integrating a total of 10000
 years. We use only the last 200 years of this control simulation for our
 analysis. ## Description of the data and file structure The data is
 generated through modelling simulations using the University of Victoria
 Earth system climate model. All the final data is in nc format, which can
 be easily read by Python/ferret or any other common data analysing
 software. all_data/control_last200yrs: simulated data files for
 40ka-control simulation all_data/FW: simulated data files for FW
 simulation which incorporates the addition of freshwater flux in the North
 Atlantic. all_data/FE: simulated data files for FE simulation which
 incorporates the reduction of iron flux globally. all_data/FWFE: simulated
 data files for FW simulation which incorporates the addition of freshwater
 flux in the North Atlantic and the reduction of iron flux globally.
 all_data/**/all_tavg/tavg.*.nc files contain annual averages of the
 required variables to reproduce all the figures in the manuscript.
 all_data/**/all_tsi/tsi* files contain the globally averaged time series
 from all the simulations. all_data/**/all_tavg/tavg_tot and
 all_data/**/all_tsi/tsi_tot are the concantenated tavg*.nc and tsi*.nc for
 respective simulations to show the full transient state of variables as
 described in Fig.3 of the mansucript. Extra files that are not required
 (or important) for the manuscript are listed below:
 control_last200years/all_tavg/ferret.jnl FW/all_tavg/amoc_all/*
 FW/all_tavg/density.nc FW/all_tavg/precip._ts.gif **Code/Software**  The
 model code used to run all the simulations is available from Kvale et al.,
 2021 GMD.