1. PrPrøveforelesning, Oppgittøveforelesning, Oppgitt
EmneEmne
Water Phases (Solid, Liquid andWater Phases (Solid, Liquid and
Vapor)Vapor)
on Mars: Theoretical andon Mars: Theoretical and
ObservationalObservational
Evidence for Their Past and PresentEvidence for Their Past and Present
Distribution, Including Global InventoryDistribution, Including Global Inventory
joern@jernsletten.namejoern@jernsletten.name
http://joern.jernsletten.name/http://joern.jernsletten.name/
Mandag, 14. Juni 2004Mandag, 14. Juni 2004
Universitetet i BergenUniversitetet i Bergen
Det Matematisk-Naturvitenskapelige FakultetDet Matematisk-Naturvitenskapelige Fakultet
Institutt for GeovitenskapInstitutt for Geovitenskap
DoctorDoctor
PhilosophiaePhilosophiae
JJøørn Atlern Atle
JernslettenJernsletten
2. OutlineOutline
• Chronology
• Vapor
– Theoretical evidence
= Past & present distribution
– Observational evidence
= Past & present distribution
• Solid
– (same structure as Vapor section)
– Earth / Mars analogs
• Liquid
– (same structure as Vapor section)
– Earth / Mars analogs
• Global inventory
• Summary
• References Cited
3. Chronology Based on Crater CountsChronology Based on Crater Counts
( Adapted from McKee, 2003, after: Hartman and Neukum, 2001;
Jakosky and Phillips, 2001; Zuber, 2001; Tanaka et al., 1992 )
4. [Vapor]:[Vapor]: Early ObservationsEarly Observations
• No separable water vapor signal
= Sling psychrometer (Campbell, 1910)
• Water vapor ~3% of Earth atmosphere
= Prismatic spectrograph (Adams and St. John, 1926)
• Early obs. around λ7200 using large grating spectrograph
= No evidence for water vapor (Adams and Dunham, 1937)
• Partial pressure of water in Martian atmosphere
= Based on dissociation pressure of goethite (Adamcik, 1963)
5. [Vapor]:[Vapor]: Observational EvidenceObservational Evidence
• <1 – ~100 pr µm in atmosphere (Carr, 1996)
= Average ~10 pr µm; close to saturation
• First shown by Earth-based telescopic observations in the
1960s
• Viking Mars Atmospheric Water Detector (MAWD)
= Small amounts in the Martian atmosphere (Farmer et al., 1976)
= Global vapor content ~ 1.3 cu km water ice (Farmer et al., 1977)
• European Space Agency (ESA), Infrared Space
Observatory (ISO) (Burgdorf et al., 2000)
= Two complimentary spectrometers
Infrared
= Total column density 12 ± 3.5 pr µm
• TES observations (Smith, 2002)
= ~100 pr µm north high lat.s, ~50 pr µm south, midsummer
= <5 pr µm, middle & high lat.s, fall & winter both hemispheres
• Some H2O–bearing minerals invisible (Kirkland et al., 2003)
6. [Vapor]:[Vapor]: TES vs. Synthetic SpectrumTES vs. Synthetic Spectrum
( Adapted from Smith, 2002 )
7. [Vapor]:[Vapor]: Temporal and Spatial VariabilityTemporal and Spatial Variability
• Seasonal max. 45-50 pr µm (Barker et al., 1970)
• Obs. at McDonald Observatory 1972–1974 (Barker, 1976)
= 469 individual photoelectric scans of Doppler-shifted H2
O lines
= Almost 1 full Martian year (Ls
= 118−269° and 301−80°)
= Planetwide abundance 5−15 pr µm
= Maximum abundance ~40 pr µm
After solstice at about 40° latitude in each hemisphere
= Max. amount precedes max. insolation by 10–20° latitude
= During the "drier" seasons (5–20 pr µm) near the equinoxes on
Mars, the atmospheric water vapor changes by a factor of 2–
3x over a diurnal cycle with the maximum near local noon
= The effects of the 1973 dust storm during the southern summer
reduced the amount of water vapor over the southern
hemisphere regions to 3–8 pr µm
• Lat. of max. pr µm northern polar area => equatorial lat.s
= From northern summer through northern fall (Farmer et al., 1977)
= Not confirmed by TES (Smith, 2002)
• Deuterium cold trap u. atm. (Bertaux and Montmessin, 2001)
10. [Solid]:[Solid]: Calculated Possible Depths to theCalculated Possible Depths to the
Base of the Martian CryosphereBase of the Martian Cryosphere
( Adapted from tabular data, Clifford, 1993 ). The thermal model
used Equation 3.1, and with the following values for parameters:
Minimum: Qg
= 45 mW m-2
, K = 1.0 W m-1
K-1
, and Tmp
= 210 K;
Nominal: Qg
= 30 mW m-2
, K = 2.0 W m-1
K-1
, and Tmp
= 252 K;
Maximum: Qg
= 15 mW m-2
, K = 3.0 W m-1
K-1
, and Tmp
= 273 K
11. [Solid]:[Solid]: Constitutive Relation forConstitutive Relation for
IceIce
Glen's Flow Law is widely accepted as the constitutive relation
for ice when shear stress acts on its basal plane:
where έ is the strain rate; A is a temperature-dependent constant; τb
is the basal shear stress; and n is a power law exponent (Glen, 1958)
έ = A τb
n
Equation 4.15
Regards ice as a plastic substance with a yield stress τ of 1 bar
(Paterson, 1981)
Value of n generally taken as 3 (Paterson 1981; Johnston, 1981)
Shear strain rate (flow velocity) is lower for colder ice as a
function of A
A varies with temperature, and is equal, for example, to 6.8 x 10 -15
s-1
kPa-3
at 273 K, 4.9 x 10-16
at 263 K, 1.7 x 10-16
at 253 K, and 5.1
x 10-17
at 243 K
n varies with applied stress, taking a value of 1 for Newtonian
deformation, and 3 for non-Newtonian deformation (Paterson, 1994)
Available evidence indicates that n = 3 for most situations
(Russell-Head and Budd, 1979)
12. [Solid]:[Solid]: Deformation of FrozenDeformation of Frozen
GroundGround
The total strain in deforming frozen ground is the sum of an
instantaneous strain, ε(i)
, and a creep strain, ε(c)
. The primary
creep of frozen ground (and ice) in a state of constant stress
can be described by the creep law (Andersland et al., 1978):
ε(c)
= Kσn
tb
Equation 4.17
where K, n, and b are temperature-dependent material constants
The steady state creep strain is governed by the creep law
(Hult, 1966):
έ(c)
= G(σ, T) Equation 4.18
where έ(c)
is the steady state (secondary) creep rate; and the
function G(σ,T) is found by plotting the slope dε(c)
/dt against
the applied stress for various temperatures
13. [Solid]:[Solid]: Temperature DependenceTemperature Dependence
inin
the Creep Lawthe Creep Law
where έc
is the creep rate selected for the laboratory experiment
- for frozen soils is often taken as 10-5
min-1
(Andersland et al.,
1978); σc
is the uniaxial stress for the selected creep rate; σc
(T) and n(T) are
temperature-dependent creep parameters
The creep law can be rewritten in the form of a power expression
(Hult, 1966; Ladanyi, 1972):
έ(c)
= έc
[σ/σc
(T)]n(T)
Equation 4.19
The equations for both primary and secondary creep emphasize the
temperature-dependence of creep deformation
14. [Solid]:[Solid]: Map of the Deformation MechanismsMap of the Deformation Mechanisms
of Iceof Ice
As a function of temperature, applied stress, and strain rate
( from Carr, 1996, after Shoji and Higashi, 1978 )
16. [Solid]:[Solid]: Typical Rock Glaciers inTypical Rock Glaciers in
Wrangell Mountains, AlaskaWrangell Mountains, Alaska
Rock glacier “a” has a single lobe, and rock glacier “b”
has a second lobe that appears to have advanced on
top of another lobe that advanced at an earlier time
( Adapted from Whalley and Azizi, 2003 )
17. [Solid]:[Solid]: Two Possible Rock-Ice SystemsTwo Possible Rock-Ice Systems
in Candor Chasma, Marsin Candor Chasma, Mars
Feature “A” resembles a rock glacier, and feature
“B” resembles a protalus rampart
( Adapted from Whalley and Azizi, 2003;
After Malin et al., 2000 )
18. [Solid]:[Solid]: Enlargements of CandorEnlargements of Candor
Chasma FeaturesChasma Features
Feature “A” resembles a rock glacier, and feature
“B” resembles a protalus rampart
( Adapted from Whalley and Azizi, 2003;
After Malin et al., 2000 )
Enlargement of feature A Enlargement of feature B
19. [Solid]:[Solid]: Degradation of Ice-rich MaterialDegradation of Ice-rich Material
• Insolation asymmetries → slope asymmetries
– Differential sublimation erosion
(Howard et al., 1982; Fenton and Herkenhoff, 2000 )
– Differential ground ice melting
(Kreslavsky and Head, 2003 )
• Sublimation erosion in degradation of slopes
– Mars
(Squyres, 1979; Howard et al., 1982; Moore et al., 1996; Fenton and Herkenhoff,
2000;
Kreslavsky and Head, 2003 )
– Moons; including Triton, Io, and Ganymede
(Smith et al., 1989; Moore et al., 1996, 1997, 1998 )
20. [Solid]:[Solid]: Profiles of Trough inProfiles of Trough in
Northern Polar Layered DepositsNorthern Polar Layered Deposits
(Adapted from Fenton and Herkenhoff, 2000)
21. [Solid]:[Solid]: Profiles of Trough inProfiles of Trough in
Northern Polar Layered DepositsNorthern Polar Layered Deposits
(Adapted from Fenton and Herkenhoff, 2000)
33. [Solid]:[Solid]: Depth below the Surface at whichDepth below the Surface at which
Ground Ice is StableGround Ice is Stable
(Adapted from Carr, 1996; after Farmer and Doms, 1979)
34. [Solid]:[Solid]: Map of Epithermal Neutron FluxMap of Epithermal Neutron Flux
from the Neutron Spectrometer of the GRSfrom the Neutron Spectrometer of the GRS
Source: Boynton et al. (2002). Low values of epithermal flux indicate high hydrogen concentration (8). Contours (in white)
show the regions where water ice is predicted to be stable at 0.8 meters depth as predicted by the model of Mellon and
Jakosky (1993) (note that no predictions were made poleward of 60° latitude as no thermal inertia data were available)
36. [Solid]:[Solid]: Polar Layered DepositsPolar Layered Deposits
Mars Orbiter Camera
image No. 46103;
( Images courtesy of
NASA/JPL/Malin Space
Science Systems )
38. LiquidLiquid
• Current atmospheric temperature and pressure
conditions preclude the existence of liquid water on
the surface of Mars
= 154-218 K, diurnal range 170-290 K at lower latitudes
= 6-10 mbar
Past & present distribution
39. [Liquid]:[Liquid]: Coprates Chasma LayeringCoprates Chasma Layering
andand
Spur-and-Gully MorphologySpur-and-Gully Morphology
b. This close-up is centered at 14.5° South, 55.8° West;
Image covers an area of approximately 9.8 km by 17.3
km;
North is up ( MOC images courtesy of NASA/JPL/Malin
Space Science Systems )
a. Context image b. Central ridge close-up
40. [Liquid]:[Liquid]: Floor Deposits in ParallelFloor Deposits in Parallel
Trough South of Coprates ChasmaTrough South of Coprates Chasma
Mars Orbiter Camera image No. MOC2-
420;
center of image is at 60.1º West
longitude, 15.2º South latitude
( Image courtesy of NASA/JPL/Malin
Space
Science Systems )
41. [Liquid]:[Liquid]: Layered Floor Deposits in FarLayered Floor Deposits in Far
Western Candor ChasmaWestern Candor Chasma
Right image is 1.5 km wide, 2.9 km tall;
Mars Orbiter Camera image No. FHA-01278;
Context image Mars Orbiter Camera image No. FHA-01275;
( Images courtesy of NASA/JPL/Malin Space Science Systems
)
a. Context image b. Layered floor deposits
42. [Liquid]:[Liquid]: Nirgal Vallis Sand WavesNirgal Vallis Sand Waves
Mars Orbiter Camera
image No. E02-02651;
( Image courtesy of
NASA/JPL/Malin Space
Science Systems )
43. [Liquid]:[Liquid]: Nanedi Vallis ChannelNanedi Vallis Channel
Mars Orbiter Camera
image No. 8704;
( Image courtesy of
NASA/JPL/Malin Space
Science Systems )
47. [Liquid]:[Liquid]: Peña de Hierro, Main SourcePeña de Hierro, Main Source
AreaArea
Morris et al., 2004Morris et al., 2004
Kargel and Marion, 2004Kargel and Marion, 2004
Stoker et al., 2004Stoker et al., 2004
Fernández-Remolar et al., 2003, 2004Fernández-Remolar et al., 2003, 2004
Jernsletten and Heggy, 2004a,bJernsletten and Heggy, 2004a,b
A.k.a. MER-B in the Late Hesperian?A.k.a. MER-B in the Late Hesperian?
Jarosite =Jarosite = KFeKFe3+3+
33 (SO(SO44 ))22 (OH)(OH)66
Basic hydrous potassium iron sulfate
Yellow-brown, brown, orange-brown
Light yellow streaks
48. [Global inventory]:[Global inventory]: Estimates for major HEstimates for major H22 OO
Reservoirs and TotalReservoirs and Total
Present-Day Inventory of Water on MarsPresent-Day Inventory of Water on Mars
( Sources: 1Farmer and Doms, 1979; 2Carr, 1987; 3Smith et al., 1999;
4Johnson et al., 2000; 5Clifford, 1993 )
49. SummarySummary
• 10-12 pr µm water vapor in Martian atmosphere
= Always close to saturation
= Direct observational evidence from MAWD, TES, telescopic obs.
• Presence of water ice evidenced by
= Polar ice caps
= Polar layered terrain
= Terrain deformation
Analogs to terrestrial rock glaciers & protalus ramparts
Poleward / equatorward slope assymmetries
= Direct observational evidence from Odyssey / GRS / HEND
Gamma Ray Spectrometer / High Energy Neutron Detector
• Past presence of liquid water evidenced by
= Layering / apparent sedimentation
= Morphologic evidence
Apparent river channels / lake beds / shore lines
Apparent signatures of water flow
= Direct observational evidence from MER-B Opportunity (!)
Jarocite, “blueberries”
Analog to acidic metal-rich brine pools in Rio Tinto, Spain
• Equivalent ocean 100’s m global inventory
=> Abundant evidence for water on Mars
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Notes de l'éditeur
Dick Morris’ talk at LPSC 35 referred to Rio Tinto as an analog environment to that of the MER-B landing site for the formation of jarocite (acidic environment; pH ~1.5-3). Jeff Kargel also referred to Rio Tinto at the same meeting. If you want to know more about the Rio Tinto analog, refer to David Fernandez’ and Carol Stoker’s talks at LPSC 35, and earlier work in Rio Tinto by them and others.