A numerical model of convective heat transfer in Titan's subsurface ocean
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10447987" target="_blank" >RIV/00216208:11320/22:10447987 - isvavai.cz</a>
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=jdu5oXouBJ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=jdu5oXouBJ</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.icarus.2021.114853" target="_blank" >10.1016/j.icarus.2021.114853</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
A numerical model of convective heat transfer in Titan's subsurface ocean
Popis výsledku v původním jazyce
It has been suggested that the long-wavelength topography of Titan is related to lateral variations in the heat flux from the ocean. Recent studies of the heat transfer in Titan's ocean agree that the time-averaged heat flux can vary in latitude by tens of percent, but they predict different distributions of heat flux anomalies at the upper boundary of the ocean. In order to clarify this issue, we perform 115 numerical simulations of thermal convection in a rotating spherical shell, varying the mechanical boundary conditions and dimensionless input parameters (Rayleigh, Ekman and Prandtl numbers) by at least one order of magnitude. The results of the simulations are examined in terms of the modified transitional number, R-G* = RaEk12/7Pr-1. Depending on the relative importance of rotation, the heat flux maximum is located either at the equator (equatorial cooling) or at the poles (polar cooling). We demonstrate that equatorial cooling occurs when R-G*< 1 or R-G* > 10 while polar cooling occurs when R-G* is an element of < 1, 10 >. Based on this result, we predict that Titan's ocean is in the polar cooling mode and the heat flux distribution is controlled by zonal degree 2 and 4 harmonics. The predicted heat flux shows a high degree of similarity with the axisymmetric part of Titan's long-wavelength topography, indicating a strong relationship between ocean dynamics and the processes in the ice shell.
Název v anglickém jazyce
A numerical model of convective heat transfer in Titan's subsurface ocean
Popis výsledku anglicky
It has been suggested that the long-wavelength topography of Titan is related to lateral variations in the heat flux from the ocean. Recent studies of the heat transfer in Titan's ocean agree that the time-averaged heat flux can vary in latitude by tens of percent, but they predict different distributions of heat flux anomalies at the upper boundary of the ocean. In order to clarify this issue, we perform 115 numerical simulations of thermal convection in a rotating spherical shell, varying the mechanical boundary conditions and dimensionless input parameters (Rayleigh, Ekman and Prandtl numbers) by at least one order of magnitude. The results of the simulations are examined in terms of the modified transitional number, R-G* = RaEk12/7Pr-1. Depending on the relative importance of rotation, the heat flux maximum is located either at the equator (equatorial cooling) or at the poles (polar cooling). We demonstrate that equatorial cooling occurs when R-G*< 1 or R-G* > 10 while polar cooling occurs when R-G* is an element of < 1, 10 >. Based on this result, we predict that Titan's ocean is in the polar cooling mode and the heat flux distribution is controlled by zonal degree 2 and 4 harmonics. The predicted heat flux shows a high degree of similarity with the axisymmetric part of Titan's long-wavelength topography, indicating a strong relationship between ocean dynamics and the processes in the ice shell.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10500 - Earth and related environmental sciences
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2022
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Icarus
ISSN
0019-1035
e-ISSN
1090-2643
Svazek periodika
376
Číslo periodika v rámci svazku
April
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
15
Strana od-do
114853
Kód UT WoS článku
000793268700008
EID výsledku v databázi Scopus
2-s2.0-85122625021