TY - JOUR
T1 - Circulation and Tides in a Cooler Upper Atmosphere
T2 - Dynamical Effects of CO2 Doubling
AU - Liu, Huixin
AU - Tao, Chihiro
AU - Jin, Hidekatsu
AU - Nakamoto, Yusuke
N1 - Funding Information:
We thank both reviewers for valuable comments, which greatly helped to improve the manuscript. H. L. acknowledges supports by JSPS KAKENHI Grants 18H01270, 18H04446, 17KK0095, and JRPs‐LEAD with DFG program. C. T. is supported by JSPS KAKENHI 19K03942. This work was motivated by ISSI trend workshop in 2017.
Funding Information:
We thank both reviewers for valuable comments, which greatly helped to improve the manuscript. H.?L. acknowledges supports by JSPS KAKENHI Grants 18H01270, 18H04446, 17KK0095, and JRPs-LEAD with DFG program. C.?T. is supported by JSPS KAKENHI 19K03942. This work was motivated by ISSI trend workshop in 2017.
Publisher Copyright:
©2020. The Authors.
PY - 2020/5/28
Y1 - 2020/5/28
N2 - Thermosphere cooling is a known effect of increasing CO2 in the atmosphere. In this study, we explore the changes of thermosphere circulation and tides in the cooled thermosphere via a doubled CO2 numerical experiment using the Ground-to-topside Atmosphere Ionosphere model for Aeronomy (GAIA). The results reveal three major features. (1) The thermosphere cools about 10 K more around solstices than equinoxes, more at the summer pole than the winter pole. (2) The meridional circulation shifts downward and strongly accelerates by 5–15 m s−1. (3) The tidal activity experiences dramatic changes, with a 40–60% reduction in the semidiurnal tides (SW2) throughout the thermosphere but an 30–50% enhancement in diurnal tides (DW1) below 200 km altitude. The nonmigrating tide DE3 has only minor changes. These changes in temperature, meridional circulation, and tides are persistent features in all seasons and can profoundly affect the spatial distribution and diurnal cycles of the ionospheric responses to CO2 doubling via atmosphere composition and electrodynamics.
AB - Thermosphere cooling is a known effect of increasing CO2 in the atmosphere. In this study, we explore the changes of thermosphere circulation and tides in the cooled thermosphere via a doubled CO2 numerical experiment using the Ground-to-topside Atmosphere Ionosphere model for Aeronomy (GAIA). The results reveal three major features. (1) The thermosphere cools about 10 K more around solstices than equinoxes, more at the summer pole than the winter pole. (2) The meridional circulation shifts downward and strongly accelerates by 5–15 m s−1. (3) The tidal activity experiences dramatic changes, with a 40–60% reduction in the semidiurnal tides (SW2) throughout the thermosphere but an 30–50% enhancement in diurnal tides (DW1) below 200 km altitude. The nonmigrating tide DE3 has only minor changes. These changes in temperature, meridional circulation, and tides are persistent features in all seasons and can profoundly affect the spatial distribution and diurnal cycles of the ionospheric responses to CO2 doubling via atmosphere composition and electrodynamics.
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U2 - 10.1029/2020GL087413
DO - 10.1029/2020GL087413
M3 - Article
AN - SCOPUS:85085559132
SN - 0094-8276
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 10
M1 - e2020GL087413
ER -