Preliminary interpretation of the REMS pressure data from the first 100 sols of the MSL mission

Haberle, R. M.; Gómez‐Elvira, Javier; Juárez, Manuel de la Torre; Harri, A. M.; Hollingsworth, J. L.; Kahanpää, Henrik; Kahre, M. A.; Lemmon, M. T.; Martín-Torres, F. J.; Mischna, M. A.; Moores, John E.; Newman, C. E.; Rafkin, Scot; Rennó, N. O.; Richardson, M. I.; Rodríguez‐Manfredi, J. A.; Vasavada, A. R.

doi:10.1002/2013je004488

Cited by 87 publications

(85 citation statements)

References 40 publications

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“…The pressure returned to the nominal diurnal cycle around sol 2170 (Figure a), with slight differences in accordance with the seasonal evolution (Guzewich et al, ; Haberle et al, ). The daily pressure amplitude also decreased from the average amplitude within the highly dusty phase of ~124 to ~103 Pa, close to its nominal values for this season.…”

Section: Gale Crater Environment and General Effects Of The Global Dusupporting

confidence: 73%

Effects of the MY34/2018 Global Dust Storm as Measured by MSL REMS in Gale Crater

et al. 2019

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The Rover Environmental Monitoring Station (REMS) instrument is on board NASA's Mars Science Laboratory (MSL) Curiosity rover. REMS has been measuring surface pressure, air, and ground brightness temperature, relative humidity, and ultraviolet (UV) irradiance since MSL's landing in 2012. In Mars Year (MY) 34 (2018) a global dust storm reached Gale Crater at Ls ~ 190°. REMS offers a unique opportunity to better understand the impact of a global dust storm on local environmental conditions, which complements previous observations by the Viking landers and Mars Exploration Rovers. All atmospheric variables measured by REMS are strongly affected albeit at different times. During the onset phase, the daily maximum UV radiation decreased by 90% between sols 2075 (opacity ~1) and 2085 (opacity ~8.5). The diurnal range in ground and air temperatures decreased by 35 and 56 K, respectively, with also a diurnal‐average decrease of ~2 and 4 K respectively. The maximum relative humidity, which occurs right before sunrise, decreased to below 5%, compared with prestorm values of up to 29%, due to the warmer air temperatures at night, while the inferred water vapor abundance suggests an increase during the storm. Between sols 2085 and 2130, the typical nighttime stable inversion layer was absent near the surface as ground temperatures remained warmer than near‐surface air temperatures. Finally, the frequency domain behavior of the diurnal pressure cycle shows a strong increase in the strength of the semidiurnal and terdiurnal modes peaking after the local opacity maximum, also suggesting differences in the dust abundance inside and outside Gale.

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Section: Gale Crater Environment and General Effects Of The Global Dusupporting

confidence: 73%

Effects of the MY34/2018 Global Dust Storm as Measured by MSL REMS in Gale Crater

et al. 2019

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“…Hourly data from REMS is used here as an independent verification. Note that the rover sits within the Gale Crater at a distinctly higher surface pressure than is represented by the model results, which will have some influence on the comparison of simulations with observations (Haberle et al, 2014). As discussed in Tyler and Barnes (2013), the crater appears to enhance the tide response, and this matter is discussed in Section 4.3.…”

Section: Tes Profilesmentioning

confidence: 88%

Impact of assimilation window length on diurnal features in a Mars atmospheric analysis

Zhao¹,

Greybush²,

Wilson³

et al. 2015

Tellus A: Dynamic Meteorology and Oceanography

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A B S T R A C T Effective simulation of diurnal variability is an important aspect of many geophysical data assimilation systems. For the Martian atmosphere, thermal tides are particularly prominent and contribute much to the Martian atmospheric circulation, dynamics and dust transport. To study the Mars diurnal variability and Mars thermal tides, the Geophysical Fluid Dynamics Laboratory Mars Global Climate Model with the 4D-local ensemble transform Kalman filter (4D-LETKF) is used to perform an analysis assimilating spacecraft temperature retrievals. We find that the use of a 'traditional' 6-hr assimilation cycle induces spurious forcing of a resonantly enhanced semi-diurnal Kelvin waves represented in both surface pressure and mid-level temperature by forming a wave 4 pattern in the diurnal averaged analysis increment that acts as a 'topographic' stationary forcing. Different assimilation window lengths in the 4D-LETKF are introduced to remove the artificially induced resonance. It is found that short assimilation window lengths not only remove the spurious resonance, but also push the migrating semi-diurnal temperature variation at 50 Pa closer to the estimated 'true' tides even in the absence of a radiatively active water ice cloud parameterisation. In order to compare the performance of different assimilation window lengths, short-term to mid-range forecasts based on the hour 00 and 12 assimilation are evaluated and compared. Results show that during Northern Hemisphere summer, it is not the assimilation window length, but the radiatively active water ice clouds that influence the model prediction. A 'diurnal bias correction' that includes bias correction fields dependent on the local time is shown to effectively reduce the forecast root mean square differences between forecasts and observations, compensate for the absence of water ice cloud parameterisation and enhance Martian atmosphere prediction. The implications of these results for data assimilation in the Earth's atmosphere are discussed.

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“…Heating causes an inflation of the atmosphere with a simultaneous drop in surface pressure and column mass. At Gale Crater, the thermal tide produces a daily variation in column mass of about ±5% relative to the median, as measured by the Rover Environmental Monitoring Station (REMS) (Haberle et al 2014). This diurnal change of the atmospheric depth causes daily oscillations of the dose rate measured by RAD of up to ∼ 2.5%: when the pressure (column mass) increases during the night, the total dose rate decreases; when the pressure decreases during the mid-day, the total dose rate increases (Rafkin et al 2014).…”

Section: Filtering Out Diurnal Variations In Msl/radmentioning

confidence: 99%

Measurements of Forbush decreases at Mars: both by MSL on ground and by MAVEN in orbit

Guo

Lillis

Wimmer‐Schweingruber

et al. 2018

A&A

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The Radiation Assessment Detector (RAD), on board Mars Science Laboratory's (MSL) Curiosity rover, has been measuring ground level particle fluxes along with the radiation dose rate at the surface of Mars since August 2012. Similar to neutron monitors at Earth, RAD sees many Forbush decreases (FDs) in the galactic cosmic ray (GCR) induced surface fluxes and dose rates. These FDs are associated with coronal mass ejections (CMEs) and/or stream/corotating interaction regions (SIRs/CIRs). Orbiting above the Martian atmosphere, the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft has also been monitoring space weather conditions at Mars since September 2014. The penetrating particle flux channels in the Solar Energetic Particle (SEP) instrument onboard MAVEN can also be employed to detect FDs. For the first time, we study the statistics and properties of a list of FDs observed in-situ at Mars, seen both on the surface by MSL/RAD and in orbit detected by the MAVEN/SEP instrument. Such a list of FDs can be used for studying interplanetary CME (ICME) propagation and SIR evolution through the inner heliosphere. The magnitudes of different FDs can be well-fitted by a power-law distribution. The systematic difference between the magnitudes of the FDs within and outside the Martian atmosphere may be mostly attributed to the energy-dependent modulation of the GCR particles by both the pass-by ICMEs/SIRs and the Martian atmosphere.

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Preliminary interpretation of the REMS pressure data from the first 100 sols of the MSL mission

Cited by 87 publications

References 40 publications

Effects of the MY34/2018 Global Dust Storm as Measured by MSL REMS in Gale Crater

Effects of the MY34/2018 Global Dust Storm as Measured by MSL REMS in Gale Crater

Impact of assimilation window length on diurnal features in a Mars atmospheric analysis

Measurements of Forbush decreases at Mars: both by MSL on ground and by MAVEN in orbit

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