干旱区生态环境知识资源中心(Arid): Stabilization of Dayside Surface Liquid Water via Tropopause Cold Trapping on Arid Slowly Rotating Tidally Locked Planets

Arid

DOI	10.3847/2041-8213/ab77d1
	Stabilization of Dayside Surface Liquid Water via Tropopause Cold Trapping on Arid Slowly Rotating Tidally Locked Planets
	Ding, Feng 1; Wordsworth, Robin D.1,2
通讯作者	Ding, Feng
来源期刊	ASTROPHYSICAL JOURNAL LETTERS
ISSN	2041-8205
EISSN	2041-8213
出版年	2020
卷号	891 期号:1
英文摘要	Terrestrial-type exoplanets orbiting nearby red dwarf stars (M dwarfs) are among the best targets for atmospheric characterization and biosignature searches in the near future. Recent evolutionary studies have suggested that terrestrial planets in the habitable zone of M dwarfs are probably tidally locked and have limited surface water inventories as a result of their host stars' high early luminosities. Several previous climate simulations of such planets have indicated that their remaining water would be transported to the planet's permanent nightside and become trapped as surface ice, leaving the dayside devoid of water. Here we use a three-dimensional general circulation model with a water cycle and accurate radiative transfer scheme to investigate the surface water evolution on slowly rotating tidally locked terrestrial planets with limited surface water inventories. We show that there is a competition for water trapping between the nightside surface and the substellar tropopause in this type of climate system. Although under some conditions the surface water remains trapped on the nightside as an ice sheet, in other cases liquid water stabilizes in a circular area in the substellar region as a wetland. Planets with 1 bar N-2 and atmospheric CO2 levels greater than 0.1 bar retain stable dayside liquid water, even with very small surface water inventories. Our results reveal the diversity of possible climate states on terrestrial-type exoplanets and highlight the importance of surface liquid water detection techniques for future characterization efforts.
英文关键词	Astrobiology Computational methods Atmospheric circulation Extrasolar rocky planets Water vapor Exoplanet atmospheres
类型	Article
语种	英语
国家	USA
开放获取类型	Green Submitted, Bronze
收录类别	SCI-E
WOS记录号	WOS:000518652500001
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314115
作者单位	1.Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 2.Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA
推荐引用方式 GB/T 7714	Ding, Feng,Wordsworth, Robin D.. Stabilization of Dayside Surface Liquid Water via Tropopause Cold Trapping on Arid Slowly Rotating Tidally Locked Planets[J],2020,891(1).
APA	Ding, Feng,&Wordsworth, Robin D..(2020).Stabilization of Dayside Surface Liquid Water via Tropopause Cold Trapping on Arid Slowly Rotating Tidally Locked Planets.ASTROPHYSICAL JOURNAL LETTERS,891(1).
MLA	Ding, Feng,et al."Stabilization of Dayside Surface Liquid Water via Tropopause Cold Trapping on Arid Slowly Rotating Tidally Locked Planets".ASTROPHYSICAL JOURNAL LETTERS 891.1(2020).