FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1630802246> ?p ?o ?g. }

• W1630802246 startingPage "264" @default.
• W1630802246 abstract "We report the occurrence of a new type of cloud in the Mars atmosphere, apparent as high altitude (60 to 80 km mesospheric), vertically discrete aerosol scattering layers. Mars Global Surveyor (MGS) limb observations from the Thermal Emission Spectrometer (TES) over 2-3 pm local times (LT) indicate distinctive temporal and spatial distributions that suggest strong dynamical influences in the formation of these Mars equatorial mesospheric (MEM) clouds. They exhibit high occurrence frequencies at the beginning and end of the aphelion northern summer season on Mars (centered at Ls = 30° and 150°), where they are confined to equatorial (15S-15N) latitudes and two relatively narrow longitude ranges (330-20W and 50-120W). Limb images from the MGS Mars Orbital Camera (MOC) over 1-3 pm LT indicate significant horizontal variations in these mesospheric clouds on scales of 25-50 km, which couple with the limb viewing geometry to introduce ambiguity in the altitude of individual cloud identifications. Based on the observed distribution of projected limb heights, MEM clouds exhibit peak optical depths that are quite significant (τvis ~ 0.01) for the low-pressure region of formation (~ 1 μbar), within a fairly narrow altitude range of 70-80 km. Undetectable 5-40 μm signal within TES IR limb spectra precludes direct compositional information (i.e., water versus CO2 ice). However, the observed upper limit for infrared scattering in the context of the observed visible scattering (TES solar band and MOC blue filter) indicates small aerosol particle sizes (Reff ≤ 0.5 μm) for water or CO2 ice compositions. If MEM clouds are water ice, vigorous dynamical transport of water vapor to the 70-80 km altitude of cloud formation is required to produce the substantial cloud optical depths observed. If the mesospheric clouds are CO2 ice, very cold (≤ 105 K) atmospheric temperatures are required for the season and location of their occurrence. Spatially resolved temperature measurements of the Mars mesosphere are very limited, but the Pathfinder entry profile (Lat=19N, Long=34W, Ls =142°, LT= 4 am) exhibited cold, CO2 saturation temperatures around 80 km for a location and season consistent with MEM cloud occurrence. Furthermore, disk-average 70-80 km Mar atmospheric temperatures from groundbased sub-millimeter observations indicate minimum values (daytime, 40S-40N, ≤ 120 K) for the solar longitude ranges of MEM clouds, as do European Climate Database (EMCDsee Forget et al, 1999) model temperature fields at 82 km. Introduction: One of the more interesting aspects of the atmospheric temperature profiles retrieved during the Pathfinder descent entry was the detection of cold 80 km altitude temperatures below the saturation conditions for CO2 ice formation (Schofield et al., 1997). Clancy and Sandor (1998) suggested the relatively frequent occurrence of CO2 ice clouds in the 70-80 km altitude region, on the basis of observed (Pathfinder and sub-millimeter ground-based) cold temperatures, Pathfinder images of blue (small size) ice clouds in the predawn sky (Smith et al., 1997), and Mariner 6 and 7 near-IR (4.3 micron) identification of CO2 ice in equatorial limb tangent views around Ls=200° in 1969 (Herr and Pimental, 1970 – but which may be due to nonLTE CO2 emission). Before MGS observations, it remained unclear whether CO2 or water ice aerosols are ever present at > 60 km altitudes. Dust aerosols had been identified at such high altitudes in Mariner 9 (Anderson and Leovy, 1978), Viking (Jaquin et al., 1986) and MGS (Clancy et al., 2003) limb radiances, associated with the 1971, 1977, and 2001 global dust storms, respectively. The highest detached ice cloud identified from Viking limb data occurred at a projected tangent altitude of 55 km, at 16S, 72W and Ls = 176° (Jaquin et al., 1986; recently modeled by Montmessin et al., 2002)." @default.
• W1630802246 created "2016-06-24" @default.
• W1630802246 creator A5000033765 @default.
• W1630802246 creator A5022336070 @default.
• W1630802246 creator A5068901180 @default.
• W1630802246 creator A5073712139 @default.
• W1630802246 date "2006-02-01" @default.
• W1630802246 modified "2023-09-27" @default.
• W1630802246 title "Mars equatorial mesospheric clouds" @default.
• W1630802246 cites W1617576290 @default.
• W1630802246 cites W1645671124 @default.
• W1630802246 cites W1983079246 @default.
• W1630802246 cites W2002905914 @default.
• W1630802246 cites W2005531760 @default.
• W1630802246 cites W2025465559 @default.
• W1630802246 cites W2031576371 @default.
• W1630802246 cites W2058087673 @default.
• W1630802246 cites W2061104252 @default.
• W1630802246 cites W2168309023 @default.
• W1630802246 cites W2179107783 @default.
• W1630802246 hasPublicationYear "2006" @default.
• W1630802246 type Work @default.
• W1630802246 sameAs 1630802246 @default.
• W1630802246 citedByCount "1" @default.
• W1630802246 crossrefType "journal-article" @default.
• W1630802246 hasAuthorship W1630802246A5000033765 @default.
• W1630802246 hasAuthorship W1630802246A5022336070 @default.
• W1630802246 hasAuthorship W1630802246A5068901180 @default.
• W1630802246 hasAuthorship W1630802246A5073712139 @default.
• W1630802246 hasConcept C121332964 @default.
• W1630802246 hasConcept C122523270 @default.
• W1630802246 hasConcept C127313418 @default.
• W1630802246 hasConcept C13280743 @default.
• W1630802246 hasConcept C153294291 @default.
• W1630802246 hasConcept C163861444 @default.
• W1630802246 hasConcept C2524010 @default.
• W1630802246 hasConcept C2778600265 @default.
• W1630802246 hasConcept C2780554747 @default.
• W1630802246 hasConcept C33923547 @default.
• W1630802246 hasConcept C45095769 @default.
• W1630802246 hasConcept C6350597 @default.
• W1630802246 hasConcept C65440619 @default.
• W1630802246 hasConcept C69976271 @default.
• W1630802246 hasConcept C83260615 @default.
• W1630802246 hasConcept C87355193 @default.
• W1630802246 hasConcept C91586092 @default.
• W1630802246 hasConceptScore W1630802246C121332964 @default.
• W1630802246 hasConceptScore W1630802246C122523270 @default.
• W1630802246 hasConceptScore W1630802246C127313418 @default.
• W1630802246 hasConceptScore W1630802246C13280743 @default.
• W1630802246 hasConceptScore W1630802246C153294291 @default.
• W1630802246 hasConceptScore W1630802246C163861444 @default.
• W1630802246 hasConceptScore W1630802246C2524010 @default.
• W1630802246 hasConceptScore W1630802246C2778600265 @default.
• W1630802246 hasConceptScore W1630802246C2780554747 @default.
• W1630802246 hasConceptScore W1630802246C33923547 @default.
• W1630802246 hasConceptScore W1630802246C45095769 @default.
• W1630802246 hasConceptScore W1630802246C6350597 @default.
• W1630802246 hasConceptScore W1630802246C65440619 @default.
• W1630802246 hasConceptScore W1630802246C69976271 @default.
• W1630802246 hasConceptScore W1630802246C83260615 @default.
• W1630802246 hasConceptScore W1630802246C87355193 @default.
• W1630802246 hasConceptScore W1630802246C91586092 @default.
• W1630802246 hasLocation W16308022461 @default.
• W1630802246 hasOpenAccess W1630802246 @default.
• W1630802246 hasPrimaryLocation W16308022461 @default.
• W1630802246 hasRelatedWork W1558665038 @default.
• W1630802246 hasRelatedWork W1592055448 @default.
• W1630802246 hasRelatedWork W1614151450 @default.
• W1630802246 hasRelatedWork W1634134602 @default.
• W1630802246 hasRelatedWork W1676497229 @default.
• W1630802246 hasRelatedWork W1915680810 @default.
• W1630802246 hasRelatedWork W1993109153 @default.
• W1630802246 hasRelatedWork W2040028739 @default.
• W1630802246 hasRelatedWork W2056865533 @default.
• W1630802246 hasRelatedWork W2066329937 @default.
• W1630802246 hasRelatedWork W2069954084 @default.
• W1630802246 hasRelatedWork W2091604999 @default.
• W1630802246 hasRelatedWork W2102499268 @default.
• W1630802246 hasRelatedWork W2146146208 @default.
• W1630802246 hasRelatedWork W2336818755 @default.
• W1630802246 hasRelatedWork W2607296946 @default.
• W1630802246 hasRelatedWork W287065594 @default.
• W1630802246 hasRelatedWork W3088196940 @default.
• W1630802246 hasRelatedWork W3105652025 @default.
• W1630802246 hasRelatedWork W3138969867 @default.
• W1630802246 isParatext "false" @default.
• W1630802246 isRetracted "false" @default.
• W1630802246 magId "1630802246" @default.
• W1630802246 workType "article" @default.