The impact of zonally symmetric and asymmetric climates on tropical cyclone genesis in coupled Aqua and Ridge Planets

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.

热带气旋（tropical cyclone）的生成与发展，在很大程度上依赖于大尺度环境场的有利条件。本研究借助两套理想耦合气候模式，揭示了纬向非对称性（zonal asymmetry）对热带气旋生成规模与分布特征的影响。
我们首先考察了纬向对称的"Aqua"配置：该模式模拟的是除两处极地冰盖外全域被海洋覆盖的行星。随后，我们在"Ridge"配置中，于两极冰盖之间引入一条单网格宽度的理想化大陆带，以此打破原有的纬向对称性。
本研究采用的耦合地球系统模式（CESM）配置，包含活跃的大气、海洋、海冰与陆面分量模块。
本数据集涵盖了"Aqua"与"Ridge"两种配置下，大气分量模式（CAM4）与海洋分量模式（MOM6）的输出结果。其中CAM4数据包含月平均地表温度、降水量、地表气压，以及所有默认输出变量的百年气候态序列；MOM6数据则包含本文研究所用变量的百年气候态序列。
通过对比"Aqua"与"Ridge"的模拟结果，我们可以分离出纬向非对称性对平均气候、热带变率以及热带气旋生成的影响。