The diurnal variation of dust and water ice aerosol optical depth at Jezero crater observed by MEDA/TIRS over a full Martian year

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
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引用次数: 0

Abstract

The Thermal InfraRed Sensor (TIRS) on the Perseverance rover has provided nearly two full Mars years of systematic monitoring of the total aerosol optical depth above Jezero Crater. These observations span a wide range of timescales, capturing seasonal patterns, diurnal variations, and minute-to-minute fluctuations in aerosol loading. By combining TIRS retrievals with orbital observations, the relative contributions of dust and water ice aerosols can be estimated, revealing their different seasonal and diurnal behaviors. The TIRS record shows distinct periods of dust storm activity, including strong regional storms during the perihelion season as well as short-lived but intense dust events outside the typical dust storm season. Water ice clouds exhibit pronounced seasonal and diurnal variability, with peak activity occurring during the aphelion season but with a presence throughout the year. The diurnal variation of clouds differs significantly between the aphelion and perihelion seasons, with clouds persisting throughout the night during the aphelion season, while largely absent outside of specific periods after sunrise and sunset during the perihelion season. These results provide new insights into the complex behavior of aerosols at Jezero Crater and their connections to atmospheric dynamics and the Martian dust and water cycles.

MEDA/TIRS 观测到的杰泽罗陨石坑全年火星尘埃和水冰气溶胶光学深度的昼夜变化
毅力号探测器上的热红外传感器(TIRS)对杰泽罗陨石坑上方的气溶胶总光学深度进行了近两个完整火星年的系统监测。这些观测的时间跨度很大,捕捉到了气溶胶负荷的季节模式、昼夜变化和每分钟的波动。通过将 TIRS 检索与轨道观测相结合,可以估算尘埃和水冰气溶胶的相对贡献,揭示它们不同的季节和昼夜行为。TIRS 记录显示了不同时期的沙尘暴活动,包括近日点季节的强烈区域性沙尘暴以及典型沙尘暴季节之外的短暂但强烈的沙尘事件。水冰云表现出明显的季节和昼夜变化,活动高峰出现在远日点季节,但全年都有。远日点季节和近日点季节的云昼夜变化差异很大,远日点季节整夜都有云,而近日点季节在日出和日落后的特定时段外基本没有云。这些结果为了解杰泽罗陨石坑气溶胶的复杂行为及其与大气动力学、火星尘埃和水循环的联系提供了新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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