Please cite as:
Wan, Jessica S.; Chen, Chih-Chieh-Jack; Tilmes, Simone; Luongo, Matthew T.; Richter, Jadwiga H.; Ricke, Katharine  (2024 ).  Data from: Diminished efficacy of regional marine cloud brightening in a warmer world.  UC San Diego Library Digital Collections.   https://doi.org/10.6075/J0WW7HW0

Corresponding author:
Jessica Wan
j4wan@ucsd.edu

Primary associated publication:
Wan, Jessica S.; Chen, Chih-Chieh-Jack; Tilmes, Simone; Luongo, Matthew T.; Richter, Jadwiga H.; Ricke, Katharine. (2024). Diminished efficacy of regional marine cloud brightening in a warmer world. Nature Climate Change, accepted.

Description of contents:
Ocean seeding masks to specify the grid cells and months to apply marine cloud brightening (MCB) in the mid-latitude and subtropical Pacific Ocean from Wan et al. (2024). These are input files to the Community Earth System Model (CESM) v. 2.2 simulations with MCB.
    Mask_subtropical: Subtropical Pacific seeding mask, 2% ocean area, rank by liquid cloud amount from CESM Large Ensemble 2 (LENS2) 2000-2009 climatology, Mar-Nov seeding
    Mask_midlatitude: Mid-latitude Pacific seeding mask, 2% ocean area, rank by liquid cloud amount from CESM Large Ensemble 2 (LENS2) 2000-2009 climatology, Mar-Nov seeding

Monthly mean atmospheric data for 30-year simulation years under 2010 and 2050 cyclical conditions included in analysis from Wan et al. (2024). These are processed time series output files for select variables from the control (no MCB), subtropical MCB, and mid-latitude MCB CESM2 simulations.
    Control_2050_atm_monthly: Control (no MCB) case, 2050 cyclical emissions, monthly atmospheric variables, simulation years 56-85
    Subtropical_2050_atm_monthly: Subtropical MCB case, 2050 cyclical emissions, monthly atmospheric variables, simulation years 56-85
    Midlatitude_2050_atm_monthly: Mid-latitude MCB case, 2050 cyclical emissions, monthly atmospheric variables, simulation years 56-85
    Control_2010_atm_monthly: Control (no MCB) case, 2010 cyclical emissions, monthly atmospheric variables, simulation years 56-85
    Subtropical_2010_atm_monthly: Subtropical MCB case, 2010 cyclical emissions, monthly atmospheric variables, simulation years 56-85
    Midlatitude_2010_atm_monthly: Mid-latitude MCB case, 2010 cyclical emissions, monthly atmospheric variables, simulation years 56-85

Daily mean atmospheric data for 30-year simulation years under 2010 and 2050 cyclical conditions included in analysis from Wan et al. (2024). These are processed time series output files for select variables from the control (no MCB), subtropical MCB, and mid-latitude MCB CESM2 simulations.
    Control_2050_atm_daily: Control (no MCB) case, 2050 cyclical emissions, daily atmospheric variables, simulation years 56-85
    Subtropical_2050_atm_daily: Subtropical MCB case, 2050 cyclical emissions, daily atmospheric variables, simulation years 56-85
    Midlatitude_2050_atm_daily: Mid-latitude MCB case, 2050 cyclical emissions, daily atmospheric variables, simulation years 56-85
    Control_2010_atm_daily: Control (no MCB) case, 2010 cyclical emissions, daily atmospheric variables, simulation years 56-85
    Subtropical_2010_atm_daily: Subtropical MCB case, 2010 cyclical emissions, daily atmospheric variables, simulation years 56-85
    Midlatitude_2010_atm_daily: Mid-latitude MCB case, 2010 cyclical emissions, daily atmospheric variables, simulation years 56-85

Monthly mean ocean data for 30-year simulation years under 2010 and 2050 cyclical conditions included in analysis from Wan et al. (2024). These are processed time series output files for select variables from the control (no MCB), subtropical MCB, and mid-latitude MCB CESM2 simulations.
    Control_2050_ocn_monthly: Control (no MCB) case, 2050 cyclical emissions, monthly ocean variables, simulation years 56-85
    Subtropical_2050_ocn_monthly: Subtropical MCB case, 2050 cyclical emissions, monthly ocean variables, simulation years 56-85
    Midlatitude_2050_ocn_monthly: Mid-latitude MCB case, 2050 cyclical emissions, monthly ocean variables, simulation years 56-85
    Control_2010_ocn_monthly: Control (no MCB) case, 2010 cyclical emissions, monthly ocean variables, simulation years  56-85
    Subtropical_2010_ocn_monthly: Subtropical MCB case, 2010 cyclical emissions, monthly ocean variables, simulation years 56-85
    Midlatitude_2010_ocn_monthly: Mid-latitude MCB case, 2010 cyclical emissions, monthly ocean variables, simulation years 56-85

Monthly mean atmospheric data for initial 4-years of simulation branch under 2010 and 2050 cyclical conditions included in analysis from Wan et al. (2024). These are processed time series files for select variables to capture the transient response from the control (no MCB), subtropical MCB, and mid-latitude MCB CESM2 simulations.
    Control_2050_atm_monthly_transient: Control (no MCB) case, 2050 cyclical emissions, monthly atmospheric variables, simulation years 55-58
    Subtropical_2050_atm_monthly_transient: Subtropical MCB case, 2050 cyclical emissions, monthly atmospheric variables, simulation years 55-58, MCB starts after 55 years of control branch spin up
    Midlatitude_2050_atm_monthly_transient: Mid-latitude MCB case, 2050 cyclical emissions, monthly atmospheric variables, simulation years 55-58, MCB starts after 55 years of control branch spin up
    Control_2010_atm_monthly_transient: Control (no MCB) case, 2010 cyclical emissions, monthly atmospheric variables, simulation years 1-4
    Subtropical_2010_atm_monthly_transient: Subtropical MCB case, 2010 cyclical emissions, monthly atmospheric variables, simulation years 1-4
    Midlatitude_2010_atm_monthly_transient: Mid-latitude MCB case, 2010 cyclical emissions, monthly atmospheric variables, simulation years 1-4

Monthly mean reference height temperature data for full simulations (85 years including spin up) under 2010 and 2050 cyclical conditions included in analysis from Wan et al. (2024). These are processed time series output files from the control (no MCB), subtropical MCB, and mid-latitude MCB CESM2 simulations.
    Control_2050_TREFHT_monthly: Control (no MCB) case, 2050 cyclical emissions, monthly reference height (2 m) temperature (TREFHT), simulation years 1-85
    Subtropical_2050_TREFHT_monthly: Subtropical MCB case, 2050 cyclical emissions, monthly reference height (2 m) temperature (TREFHT), simulation years 1-85
    Midlatitude_2050_TREFHT_monthly: Mid-latitude MCB case, 2050 cyclical emissions, monthly reference height (2 m) temperature (TREFHT), simulation years 1-85
    Control_2010_TREFHT_monthly: Control (no MCB) case, 2010 cyclical emissions, monthly reference height (2 m) temperature (TREFHT), simulation years 1-85
    Subtropical_2010_TREFHT_monthly: Subtropical MCB case, 2010 cyclical emissions, monthly reference height (2 m) temperature (TREFHT), simulation years 1-85
    Midlatitude_2010_TREFHT_monthly: Mid-latitude MCB case, 2010 cyclical emissions, monthly reference height (2 m) temperature (TREFHT), simulation years 1-85

Methods:
All simulation output were generated using CESM version 2.2 with cyclical emissions. Raw model output were post-processed using a combination of NCO commands and Python scripts. Data analysis was conducted using Python version 3.8.2. The conda environment file and Python scripts used to conduct the analysis can be found on GitHub: https://github.com/j4wan/wna-regional-mcb/

Technical details:
Community Earth System Model (CESM) version 2.2: National Center for Atmospheric Research (NCAR), Boulder, CO, USA.

License:
Creative Commons Attribution 4.0 International Public License.