Estimation of surface water content at the Tianwen-1 Zhurong landing site  

作　　者：Xiang Zhou Yang Liu Xing Wu ZhenXing Zhao YongLiao Zou 

机构地区：[1]State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Science,Beijing 100049,China [3]Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 200083,China

出　　处：《Earth and Planetary Physics》2023年第3期347-355,共9页地球与行星物理（英文版）

基　　金：funded by the National Key Research and Development Project(Grant No.2019YFE0123300);the National Natural Science Foundation of China(Grant No.42072337);the preresearch project on Civil Aerospace Technologies(Grant Nos.D020101 and D020102);funded by the China National Space Administration through the Pandeng Program of the National Space Science Center,Chinese Academy of Sciences,Key Research Program of the Chinese Academy of Sciences(Grant No.ZDBS-SSW-TLC001).

摘　　要：China’s first Mars rover,Zhurong,successfully landed in the south of Utopia Planitia.The surface water content at the landing area can provide constraints on mineral formation conditions and help us better understand the evolution of the Martian aqueous and geological environment.In this work,the surface kinetic temperature of the Zhurong landing area was derived by analyzing data from the Mars Express Observatoire pour la Minéralogie,l’Eau,les Glaces et l’Activité(OMEGA)spectrometer.Using the Discrete Ordinate Radiative Transfer(DISORT)model,we performed atmospheric correction and thermal correction for the OMEGA data to obtain the surface effective single-particle absorption thickness(ESPAT)parameter to evaluate the surface water content.The surface water content distribution at the landing area was relatively uniform at a lateral scale of~10 km.At the Zhurong landing site,the surface water content in the topmost layer(a few hundred micrometers)of the regolith was 5−8 weight percent water(wt%H_(2)O),assuming surface particle sizes of<45μm,or 1.6−2.5 wt%H_(2)O,assuming surface particle sizes in the range of 125−250μm.The Mars Surface Composition Detector(MarSCoDe)onboard Zhurong also observed significant H_(2)O/OH signals in the landing area.Our results provide an important regional context for the hydration state of the area and can be further verified by the H content derived from the Laser-Induced Breakdown Spectrometer(LIBS)data of MarSCoDe.

关 键 词：MARS Zhurong surface water content Observatoire pour la Minéralogie l’Eau les Glaces et l’Activité(OMEGA) Discrete Ordinate Radiative Transfer(DISORT) 

分 类 号：V476.4[航空宇航科学与技术—飞行器设计] P185.3[天文地球—天文学]