DOI: 10.5061/dryad.9kd51c5wc
title: The impact of zonally symmetric and asymmetric climates on tropical cyclone genesis in coupled Aqua and Ridge Planets

description: Tropical cyclone genesis and development largely depend on the
 conduciveness of the large-scale environment. We demonstrate the impact of
 zonal asymmetry on tropical cyclone genesis magnitude and distribution
 using two idealized coupled climate models. We first examine a zonally
 symmetric configuration, “Aqua”, which is a water-covered planet without
 land except for two polar caps. We then break the zonal symmetry by
 introducing a single grid-cell-wide strip of idealized continent between
 the two polar caps on “Ridge". The coupled CESM configurations in
 this study consist of active atmosphere, ocean, sea ice, and land
 components. This dataset includes the output from the atmospheric
 component (CAM4) and the oceanic component (MOM6) on Aqua and Ridge. The
 CAM4 data includes monthly surface temperature, precipitation, and surface
 pressure, and the 100-year climatology of all default output variables.
 The MOM6 data includes the 100-year climatology of the variables used in
 this paper. A comparison of Aqua and Ridge allows us to isolate the impact
 of zonal asymmetries on mean climate, tropical variability, and
 tropical cyclone genesis.
description: # The impact of zonally symmetric and asymmetric climates on tropical
 cyclone genesis in coupled Aqua and Ridge Planets Dataset DOI:
 [10.5061/dryad.9kd51c5wc](10.5061/dryad.9kd51c5wc) ## Description of the
 data and file structure This dataset includes model output and case
 directories of CESM coupled Aqua and Ridge simulations. The coupled models
 consist of 1-degree CAM4 and CLM5 plus 2/3-degree MOM6 and CICE5. Both
 Aqua and Ridge have been integrated for 1100 years. Climatological
 diagnostics are based on the last 100 years (years 1001–1100). The CESM
 version used in this simulation is cesm2_3_beta06. ### Files and variables
 #### File: GPI.zip **Description:** Monthly averaged GPI in 40S--40N and
 its components on Aqua and Ridge. The name scheme of all files in this
 directory is $variable_$configuration_monthly.nc.
 `GPI_clipped_av_*_monthly.nc` : dimension: lon = 288 ; lat = 84 ; time =
 1200 variable: GPI_clipped_av(time, lat, lon), monthly GPI, units =
 m^-2^s^-1^ `entropy_*_monthly.nc` : dimension: lon = 288 ; lat = 192 ;
 time = 1200 variables: ED(time, lat, lon), monthly moist entropy deficit
 of the middle troposphere, units = non-dimensional `PI_*_monthly.nc` :
 dimension: lon = 288 ; lat = 84 ; time = 1200 variables: pmin(time, lat,
 lon), monthly mininum central pressure, units = hPa vmax(time, lat, lon),
 maximum surface wind speed, units = m/s To(time, lat, lon), outflow
 temperature, units = K p_o(time, lat, lon), outflow temperature level,
 units = hPa `vort_*_monthly.nc` : dimension: lon = 288 ; lat = 192 ; time
 = 1200; plev = 1 variable: AV(time, plev, lat, lon), monthly 850hPa
 absolute vorticity, units = s^-1^ `ws_*_monthly.nc` : dimension: lon = 288
 ; lat = 192 ; time = 1200; plev = 1 variable: ws(time, plev, lat, lon),
 monthly 250hPa-850hPa vertical wind shear, units = m/s #### File:
 b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_branch_melt_monthly.zip
 **Description:** Aqua 100-year climatology and monthly output.
 Atmosphere/ocean model output is in the **atm/ocn** directory. **File
 structure:** b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_branch_melt_monthly/\
 ├── atm/\ │ ├── b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_monthly.cam.h0.nc\ │
 └── h0_climatology_100year_aqua_mean.nc\ └── ocn/\ ├──
 b.e23.BMOM.f09_sx0.66av1.aqua.theta_clim.nc\ └──
 b.e23.BMOM.f09_sx0.66av1.aqua.uh_vh_clim.nc
 `atm/h0_climatology_100year_aqua_mean.nc`: The 100-year average of the
 full set of default CAM4 output variables.  Variables used in the
 manuscript TS_mean(lat, lon) ; time mean of Surface temperature
 (radiative) units = "K" PRECC_mean(lat, lon) ; time mean of
 Convective precipitation rate (liq + ice) units = "m/s"
 PRECL_mean(lat, lon) ; time mean of Large-scale (stable) precipitation
 rate (liq + ice) units = "m/s" RELHUM_mean(lev, lat, lon); Time
 mean of Relative humidity units = "percent" U_mean(lev, lat,
 lon);The  time mean of the Zonal wind units = "m/s" V_mean(lev,
 lat, lon);The  time mean of the Meridional wind units = "m/s"
 OMEGA_mean(lev, lat, lon); Time mean of Vertical velocity (pressure) units
 = "Pa/s" PS_mean(lat, lon); Time mean of Surface pressure units
 = "Pa"
 `atm/b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_monthly.cam.h0.nc` : Monthly
 surface temperature, precipitation, and surface pressure. dimension: lon =
 288 ; lat = 192 ; time = 1200 PRECC(time, lat, lon) ; Convective
 precipitation rate (liq + ice) units = "m/s" PRECL(time, lat,
 lon) ; Large-scale (stable) precipitation rate (liq + ice) units =
 "m/s" PS(time, lat, lon); Surface pressure units =
 "Pa" TS(time, lat, lon) ; Surface temperature (radiative) units
 = "K" `ocn/b.e23.BMOM.f09_sx0.66av1.aqua.theta_clim.nc` :
 100-year averaged ocean potential temperature. dimensions: zl = 57; yh =
 466; xh = 540 variable: thetao_mean(zl, yh, xh) ; Time mean of Sea Water
 Potential Temperature units = "degC"
 `ocn/b.e23.BMOM.f09_sx0.66av1.aqua.uh_vh_clim.nc` : 100-year averaged
 thickness fluxes. dimensions: zl = 57 ; yh = 466 ; xq = 540 ; yq = 466 ;
 xh = 540 ; Variables: uh_mean(zl, yh, xq) ; Time mean of Zonal Thickness
 Flux units = m^3^ s^-1^ uhGM_mean(zl, yh, xq) ; Time Mean of Time Mean
 Diffusive Zonal Thickness Flux units = kg s^-1^ vh_mean(zl, yq, xh) ; Time
 mean of Meridional Thickness Flux units = m^3^ s^-1^ vhGM_mean(zl, yq, xh)
 ; Time Mean of Time Mean Diffusive Meridional Thickness Flux units = kg
 s^-1^ #### File:
 b.e23.BMOM.f09_sx0.66rv1.brdg.yr1000_branch_melt_monthly.zip
 **Description:** Same as
 b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_branch_melt_monthly.zip but for Ridge
 100-year climatology and monthly output. 
 `atm/h0_climatology_100year_rdg_mean.nc` : The 100-year average of the
 full set of default CAM4 output variables. 
 `atm/b.e23.BMOM.f09_sx0.66rv1.brdg.yr1000_monthly.cam.h0.nc` : Monthly
 surface temperature, precipitation, and surface pressure.
 `ocn/b.e23.BMOM.f09_sx0.66rv1.brdg.theta_clim.nc `: 100-year averaged
 ocean potential temperature.
 `ocn/b.e23.BMOM.f09_sx0.66rv1.brdg.uh_vh_clim.nc `: 100-year averaged
 thickness fluxes. #### File: case_directory.zip **Description:**  CESM
 case directories of Aqua and Ridge, including model configurations,
 parameters, and environments for reproductions.  Case name scheme: 
 $compset_char.$code_base.$compset.$resolution.$configuration_name.$starting_year.$description compset_char = b, coupled run code_base = e23, cesm2_3 compset = BMOM, coupled run with MOM6 as the ocean component resolution = f09_sx0.66av1/f09_sx0.66rv1, ATM/LND resolution is fv0.9x1.25, OCN/ICE resolution for idealized Aqua (Ridge) is sx0.66av1 (sx0.66rv1). configuration_name = aqua/rdg starting_year = 1000. Branch restarts from the year 1000. `/b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_branch_melt_monthly` Created with: ``` ./create_newcase --compset 2000_CAM40_CLM50%SP_CICE_MOM6_SROF --res f09_sx066rv1 --run-unsupported ``` Key changes of run-time parameters in different components are included in `user_nl_*`, respectively. All XML changes are tracked in `replay.sh`. For more comprehensive model settings for each component, please check `/run/*_in`. Key parameters in MOM6 are in `/run/MOM_input`. `/b.e23.BMOM.f09_sx0.66rv1.brdg.yr1000_branch_melt_monthly/` Same file structure as /b.e23.BMOM.f09_sx0.66av1.aqua.yr1000_branch_melt_monthly, but for Ridge.