Nocturnal turbulence at Jezero crater, as determined from MEDA measurements and modeling

Pla‐García, Jorge; Munguira, Asier; Newman, Claire; Bertrand, Tanguy; Martínez, G.; Hueso, R.; Sánchez‐Lavega, Agustín; Río‐Gaztelurrutia, T. del; Stott, Alexander; Murdoch, Naomi; Juárez, Manuel de la Torre; Lemmon, M. T.; Savijärvi, Hannu; Richardson, M. I.; Martínez, Eduardo Sebastián; Lépinette, Alain; Mora-Sotomayor, Luis; Rodríguez‐Manfredi, J. A.; Viúdez‐Moreiras, Daniel; Marín, Manuela; Rafkin, Scot; Chide, Baptiste

doi:10.1002/essoar.10512563.1

Cited by 3 publications

(6 citation statements)

References 36 publications

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“…This has been observed in MEDA measurements over the mission and is reported in Pla‐García et al. (2022).…”

Section: Pbl Turbulence With Microphone Wind Speed Estimatessupporting

confidence: 78%

“…This corresponds to a period of nocturnal turbulence, which would be shear driven. This has been observed in MEDA measurements over the mission and is reported in Pla-García et al (2022).…”

Section: Comparison To Vortex Ratessupporting

confidence: 65%

“…This is in part due to the short period over which the statistic is evaluated but it helps to characterize the variability at these scales, also captured in the distributional analysis in Figure 7. We observe a nocturnal turbulence (studied for Perseverance in Pla‐García et al. (2022)) recording which does not fit to the relationships with temperature (it is not convective turbulence) but is consistent with the relationship to downwelling IR flux.…”

Section: Discussionmentioning

confidence: 49%

“…We observe a nocturnal turbulence (studied for Perseverance in Pla‐García et al. (2022)) recording which does not fit to the relationships with temperature (it is not convective turbulence) but is consistent with the relationship to downwelling IR flux.…”

Section: Discussionmentioning

confidence: 49%

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Wind and Turbulence Observations With the Mars Microphone on Perseverance

et al. 2023

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We utilize SuperCam's Mars microphone to provide information on wind speed and turbulence at high frequencies on Mars. To do so, we first demonstrate the sensitivity of the microphone signal level to wind speed, yielding a power law dependence. We then show the relationship between the microphone signal level and pressure, air and ground temperatures. A calibration function is constructed using Gaussian process regression (a machine learning technique) taking the microphone signal and air temperature as inputs to produce an estimate of the wind speed. This provides a high rate wind speed estimate on Mars, with a sample every 0.01 s. As a result, we determine the fast fluctuations of the wind at Jezero crater which highlights the nature of wind gusts over the Martian day. To analyze the turbulent behavior of this wind speed estimate, we calculate its normalized standard deviation, known as gustiness. To characterize the behavior of this high frequency turbulent intensity at Jezero crater, correlations are shown between the evaluated gustiness statistic and pressure drop rates/sizes, temperature and energy fluxes. This has implications for future atmospheric models on Mars, taking into account turbulence at the finest scales.

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“…This has been observed in MEDA measurements over the mission and is reported in Pla‐García et al. (2022).…”

Section: Pbl Turbulence With Microphone Wind Speed Estimatessupporting

confidence: 78%

Section: Comparison To Vortex Ratessupporting

confidence: 65%

Section: Discussionmentioning

confidence: 49%

Section: Discussionmentioning

confidence: 49%

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Wind and Turbulence Observations With the Mars Microphone on Perseverance

et al. 2023

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“…Nighttime pressure drops can be driven by orographic mechanical turbulence at Gale crater (Ordonez‐Etxeberria et al., 2018), and by the interaction of a low‐level jet and weak stability in Elysium (Chatain et al., 2021). In Jezero, nighttime turbulence appears in different atmospheric fields (winds, pressure and temperature) and has the characteristics of a bore‐like disturbance (Pla‐Garcia et al., 2022) that could be the cause of the nighttime pressure drops not associated to the heat island effect.…”

Section: Pressure Drops: Vortices Dust Devils Convective Cells and Wavesmentioning

confidence: 99%

Convective Vortices and Dust Devils Detected and Characterized by Mars 2020

et al. 2023

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Daytime convective vortices are common on Mars and Earth (Balme & Greeley, 2006). They constitute one of the various phenomena that develop in the Planetary Boundary Layer (PBL) of both planets, but are much more common and can be an order of magnitude larger on Mars due to the more extended PBL depth (Balme & Greeley, 2006). Dusty convective vortices, or dust devils (DDs), are vortices that have raised dust from the

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One Martian Year of Near‐Surface Temperatures at Jezero From MEDA Measurements on Mars2020/Perseverance

Munguira,

Hueso,

Sánchez‐Lavega

et al. 2024

JGR Planets

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Measurements of ground and near surface atmospheric temperatures at Jezero obtained during 700 sols by the Mars Environmental Dynamics Analyzer (MEDA) characterize the thermal behavior of the near surface Martian atmosphere during a full Martian Year. The seasonal evolution of MEDA measurements is compared with predictions from the Mars Climate Database and the solar irradiance at the surface. Thermal tides observed in the daily cycle of temperatures follow a seasonal cycle with additional variations greater than 2 K on time‐scales of tens of sols. We also observe sol‐to‐sol variations of about 1 K in mean daily air temperatures in autumn and winter with periodicities of 4–7 sols that might be related to baroclinic disturbances that are frequent in those seasons at high latitudes. We examine the evolution of the vertical thermal gradient and temperature fluctuations without finding a seasonal response to irradiance and dust load. We find that the convective boundary layer becomes isothermal and collapses 1 hr before sunset except during northern hemisphere winter, when the collapse occurs closer to sunset, implying a longer duration of the daytime convective instability. Around this period, the rover was located in the delta front in a location of complex topography where we observed stronger thermal gradients and intense daytime air temperature fluctuations. We also find in this place a nighttime event of gravity waves on near‐surface air temperatures, with amplitudes of 2 K and periods of 10 min. These waves possibly propagate downward through a near isothermal stable layer.

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Nocturnal turbulence at Jezero crater, as determined from MEDA measurements and modeling

Cited by 3 publications

References 36 publications

Wind and Turbulence Observations With the Mars Microphone on Perseverance

Wind and Turbulence Observations With the Mars Microphone on Perseverance

Convective Vortices and Dust Devils Detected and Characterized by Mars 2020

One Martian Year of Near‐Surface Temperatures at Jezero From MEDA Measurements on Mars2020/Perseverance

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