Large Scale Oscillations in the Martian Tropical Cloud Belt

IF 3.9 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Journal of Geophysical Research: Planets Pub Date : 2024-10-24 DOI:10.1029/2024JE008479

Huiqun Wang, Mark I. Richardson, Anthony D. Toigo, Claire E. Newman

{"title":"Large Scale Oscillations in the Martian Tropical Cloud Belt","authors":"Huiqun Wang, Mark I. Richardson, Anthony D. Toigo, Claire E. Newman","doi":"10.1029/2024JE008479","DOIUrl":null,"url":null,"abstract":"<div>\n \n \n <section>\n \n <p>The Tropical Cloud Oscillation (TCO) in the Martian atmosphere is a shift of clouds in the northern spring and summer tropical cloud belt between the eastern and western hemispheres on an intra-seasonal timescale of about 10–40 sols. The TCO is a significant intraseasonal variation and may strongly affect the Martian general circulation, water cycle, and dust cycle. We examine TCOs using multiple data sets with a focus on the clouds observed in Mars Daily Global Maps during Mars Year (MY) 29–35. One or more TCO cycles are observed in each MY and the phenomenon is most prominent during <i>L</i><sub>s</sub> = 135°–185°. Space-time spectral analysis shows a variety of waves which appear to follow the theoretical dispersion relationships of equatorial waves, such as Kelvin waves, Rossby waves, and Mixed Rossby Gravity waves. The TCO appears to be controlled by zonal wavenumber one traveling waves with Kelvin and Rossby wave characteristics and exhibits a fine-scale latitudinal structure that requires modeling with sufficient resolution. Issues with current data assimilation products for use in studies of Martian equatorial waves due to this fine-scale structure are discussed.</p>\n </section>\n </div>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"129 10","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Planets","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JE008479","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

The Tropical Cloud Oscillation (TCO) in the Martian atmosphere is a shift of clouds in the northern spring and summer tropical cloud belt between the eastern and western hemispheres on an intra-seasonal timescale of about 10–40 sols. The TCO is a significant intraseasonal variation and may strongly affect the Martian general circulation, water cycle, and dust cycle. We examine TCOs using multiple data sets with a focus on the clouds observed in Mars Daily Global Maps during Mars Year (MY) 29–35. One or more TCO cycles are observed in each MY and the phenomenon is most prominent during L_s = 135°–185°. Space-time spectral analysis shows a variety of waves which appear to follow the theoretical dispersion relationships of equatorial waves, such as Kelvin waves, Rossby waves, and Mixed Rossby Gravity waves. The TCO appears to be controlled by zonal wavenumber one traveling waves with Kelvin and Rossby wave characteristics and exhibits a fine-scale latitudinal structure that requires modeling with sufficient resolution. Issues with current data assimilation products for use in studies of Martian equatorial waves due to this fine-scale structure are discussed.

查看原文本刊更多论文

火星热带云带的大尺度振荡

火星大气中的热带云涛动（TCO）是东半球和西半球之间北部春夏热带云带的云层在大约 10-40 个太阳时的季内时间尺度上的移动。TCO是一种显著的季节内变化，可能会对火星大气环流、水循环和尘埃循环产生强烈影响。我们利用多个数据集研究了TCO，重点是火星年（MY）29-35期间在火星每日全球地图上观测到的云层。在每个 MY 中都观测到一个或多个 TCO 周期，在 Ls = 135°-185° 期间该现象最为突出。时空频谱分析表明，有多种波似乎遵循赤道波的理论弥散关系，如开尔文波、罗斯比波和混合罗斯比重力波。TCO 似乎是由具有开尔文波和罗斯比波特征的带状一波长行波控制的，并表现出精细的纬度结构，这就需要以足够的分辨率进行建模。讨论了目前用于火星赤道波研究的数据同化产品因这种细尺度结构而产生的问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Geophysical Research: Planets Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

8.00

自引率

27.10%

发文量

254

期刊介绍： The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.