Mars Reconnaissance Orbiter Launch - Mars Exploration Program
Aspects of Martian Meteorology From Dynamical Meteorology ...€¦ · •1971 Mars 2 Orbiter &...
Transcript of Aspects of Martian Meteorology From Dynamical Meteorology ...€¦ · •1971 Mars 2 Orbiter &...
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Dynamical Meteorology of the Martian Atmosphere
Aspects of Martian Meteorology From Surface Observations Including from
the 2012 Mars “Curiosity” Rover
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Mars Science Laboratory Curiosity
The “Curiosity” rover in clean room at JPL
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Mars Science Laboratory Curiosity
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Mars Science Laboratory Curiosity
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Mars Science Laboratory Curiosity
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Outline • Basics – orbit, topography, atmospheric composition
• Basics – dust, dust everywhere
• History of Mars planetary missions 1962-today
• Satellite measurments of atmospheric temperature
• Surface T, P and u,v observations
• Pressure record – annual cycle, baroclinic waves
• Pressure record – diurnal variations (atmospheric tides)
• Mars General Circulation Models (GCMs)
• Model simulations of atmospheric tides
• I am curious about Curiosity!
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Mars orbit and annual cycle
• Measure time through the year (or position through the orbit) by Ls (“Areocentric longitude”) (defined so that Ls=0o is NH spring equinox “March 21”)
• Aphelion 249,209,300 km
• Perihelion 206,669,000 km
• Ls of perihelion 250o - late SH spring
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Mars orbit and annual cycle
• Measure time through the year (or position through the orbit) by Ls (“Areocentric longitude”) (defined so that Ls=0o is NH spring equinox “March 21”)
• Aphelion 249,209,300 km
• Perihelion 206,669,000 km
• Ls of perihelion 250o - late SH spring
Ra2/Rp
2= 1.42 (vs. 1.07 for Earth)
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CO2 Ice Cap
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Helas Basin
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Helas Basin
Tharsus Rise
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Equatorial section through smoothed topography
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Equatorial section through smoothed topography
Zonal wavenumber 2 topography
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• 1962 Mars 2MV-3 No.1 Lander • 1969 M-69 1&2 Landers • 1971 Kosmos 419 Orbiter • 1971 Mars 2 Orbiter & Lander/Rover • 1971 Mars 3 Orbiter & Lander/Rover • 1973 Mars 4 Orbiter • 1973 Mars 5 Orbiter • 1973 Mars 6 Lander • 1973 Mars 7 Lander • 1988 Phobos 1 Lander • 1988 Phobos 2 Lander • 1996 Mars 96 Orbiter, Lander • 2011 Fobos-Grunt Phobos sample return, Orbiter
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• 1962 Mars 2MV-3 No.1 Lander • 1969 M-69 1&2 Landers • 1971 Kosmos 419 Orbiter • 1971 Mars 2 Orbiter & Lander/Rover • 1971 Mars 3 Orbiter & Lander/Rover • 1973 Mars 4 Orbiter • 1973 Mars 5 Orbiter • 1973 Mars 6 Lander • 1973 Mars 7 Lander • 1988 Phobos 1 Lander • 1988 Phobos 2 Lander • 1996 Mars 96 Orbiter, Lander” • 2011 Fobos-Grunt Phobos sample return, Orbiter
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• 1973 Mariner 8 Orbiter
• 1973 Mariner 9 Orbiter
• 1975 Viking 1 Orbiter & Lander
• 1975 Viking 2 Orbiter & Lander
• 1992 Mars Observer Orbiter
• 1996 Mars Global Surveyor Orbiter
• 1996 Mars Pathfinder Lander/Rover
• 1998 Mars Climate Orbiter
• 1999 Mars Polar Lander Lander
• 2001 Mars Odyssey Orbiter
• 2003 Spirit Rover
• 2003 Opportunity Rover
• 2005 Mars Reconnaissance Orbiter
• 2007 Phoenix Lander
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• 1973 Mariner 8 Orbiter
• 1973 Mariner 9 Orbiter
• 1975 Viking 1 Orbiter & Lander
• 1975 Viking 2 Orbiter & Lander
• 1992 Mars Observer Orbiter
• 1996 Mars Global Surveyor Orbiter
• 1996 Mars Pathfinder Lander/Rover
• 1998 Mars Climate Orbiter
• 1999 Mars Polar Lander Lander
• 2001 Mars Odyssey Orbiter
• 2003 Spirit Rover
• 2003 Opportunity Rover
• 2005 Mars Reconnaissance Orbiter
• 2007 Phoenix Lander
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• 1973 Mariner 8 Orbiter
• 1973 Mariner 9 Orbiter
• 1975 Viking 1 Orbiter & Lander
• 1975 Viking 2 Orbiter & Lander
• 1992 Mars Observer Orbiter
• 1996 Mars Global Surveyor Orbiter
• 1996 Mars Pathfinder Lander/Rover
• 1998 Mars Climate Orbiter
• 1999 Mars Polar Lander Lander
• 2001 Mars Odyssey Orbiter
• 2003 Spirit Rover
• 2003 Opportunity Rover
• 2005 Mars Reconnaissance Orbiter
• 2007 Phoenix Lander
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• 1973 Mariner 8 Orbiter
• 1973 Mariner 9 Orbiter
• 1975 Viking 1 Orbiter & Lander
• 1975 Viking 2 Orbiter & Lander
• 1992 Mars Observer Orbiter
• 1996 Mars Global Surveyor Orbiter
• 1996 Mars Pathfinder Lander/Rover
• 1998 Mars Climate Orbiter
• 1999 Mars Polar Lander Lander & Penetrators
• 2001 Mars Odyssey Orbiter
• 2003 Spirit Rover
• 2003 Opportunity Rover
• 2005 Mars Reconnaissance Orbiter
• 2007 Phoenix Lander
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NASA's Mars Phoenix Lander can be seen parachuting down to Mars, in this image captured by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter. This is the first time that a spacecraft has imaged the final descent of another spacecraft onto a planetary body.
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Phobos eclipses the Sun, imaged by the Opportunity rover
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• 1973 Mariner 8 Orbiter
• 1973 Mariner 9 Orbiter
• 1975 Viking 1 Orbiter & Lander
• 1975 Viking 2 Orbiter & Lander
• 1992 Mars Observer Orbiter
• 1996 Mars Global Surveyor Orbiter
• 1996 Mars Pathfinder Lander/Rover
• 1998 Mars Climate Orbiter
• 1999 Mars Polar Lander Lander & Penetrators
• 2001 Mars Odyssey Orbiter
• 2003 Spirit Rover
• 2003 Opportunity Rover
• 2005 Mars Reconnaissance Orbiter
• 2007 Phoenix Lander
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• 1973 Mariner 8 Orbiter
• 1973 Mariner 9 Orbiter
• 1975 Viking 1 Orbiter & Lander
• 1975 Viking 2 Orbiter & Lander
• 1992 Mars Observer Orbiter
• 1996 Mars Global Surveyor Orbiter
• 1996 Mars Pathfinder Lander/Rover
• 1998 Mars Climate Orbiter
• 1999 Mars Polar Lander Lander & Penetrators
• 2001 Mars Odyssey Orbiter
• 2003 Spirit Rover
• 2003 Opportunity Rover
• 2005 Mars Reconnaissance Orbiter
• 2007 Phoenix Lander
Surface Meteorological Data
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Curiosity
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Viking 1 and Viking 2 Landers Landed July 20 and September 3, 1976
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Viking Landers (VL1 & VL2)
• VL1 22oN
• Start Time : 1976-07-20
• Stop Time : 1982-11-13
• VL2 48oN
• Start Time : 1976-09-03 Stop Time : 1980-04-11
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This picture was taken by the Viking Lander 1 on February 11, 1978 on Sol 556. The large rock just left of the center is about two meters wide. The top of the rock is covered with red soil. Those portions of the rock not covered are similar in color to basaltic rocks on Earth. Therefore, this may be a fragment of a lava flow that was ejected by an impact crater.
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90S EQ 90N
Mars Global Surveyer – Thermal Emission Spectrometer Data
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Summer Pole
Winter Pole
Equator
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T
Geostrophic u
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~60K diurnal range of surface air temperature at ~20N
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~30 Pa diurnal range of surface pressure at ~20N
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Perihelion
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Globally cool
Globally warm
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Annual Cycle of Surface Pressure
• The surface pressure everywhere is ~30% higher near perihelion than the minimum which occurs somewhat after aphelion
• This is accompanied by a seasonal cycle in the size of the NH and SH polar “ice” caps
• We conclude that the CO2 in the atmosphere is sublimating from/condensing onto the polar caps in such large amounts that the total mass of the atmosphere has a ~30% annual cycle
• The global surface pressure is largest when the global atmosphere is warmest
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NH summer NH winter
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NH summer NH winter
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NH summer NH winter
Day-to-Day Variability Nearly Disappears in Global Dust Storms
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Season of Pathfinder Observations in 1997
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Season of Pathfinder Observations in 1997
Season of Phoenix Lander Observations in 2008
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Season of Pathfinder Observations in 1997
Season of Phoenix Lander Observations in 2008
Curiosity Arrival August 2012
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Baroclinic Waves on Mars • Lander time series data are consistent with the
weather in the winter extratropics being dominated by a series of cyclones & anticyclones moving eastward, analogous to the baroclinic waves which bring synoptic scale weather to the Earth’s lower atmosphere
But
• Baroclinic waves disappear in summer (unlike Earth)
• Baroclinic waves are more regular in time (and equator-pole gradient (baroclinicity) almost disappears in Martian summer
• Baroclinic waves nearly disappear in global dust storms
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NASA Phoenix Lander ~70N
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8 Pa
Phoenix sols
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Looking down on North Pole
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Earth thermal tides vs Mars thermal tides Similar rotation rate Less atmosphere mass on Mars stronger tide in temperature or dP/P
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Daily March of Pressure (or T…)
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• S2(p) ~twice as large as S1(p) in tropics
• Lord Kelvin proposed global resonance --NO! • (although I believe that on Mars the tide is resonant -
Hamilton & Garcia 1986; Wilson & Hamilton 1996)
S1(p) solar diurnal (24 hour) harmonic of pressure S2(p) solar semidiurnal (12 hour) harmonic of pressure
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• S2(p) ~twice as large as S1(p) in tropics
• Lord Kelvin proposed global resonance --NO!
• (although I believe that on Mars the tide is
resonant - Hamilton & Garcia 1986; Wilson & Hamilton 1996)
S1(p) solar diurnal (24 hour) harmonic of pressure S2(p) solar semidiurnal (12 hour) harmonic of pressure
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Sun-Synchronous Tides • Without zonal asymmetry in forcing (absorber
distributions; convective heating...), or mean state, or lower boundary (e.g. topography). Leads to a response which has amplitude only dependent on latitude and
• either constant phase (in local time) or uniform westward propagation (in Greenwich time)
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Observed Annual Mean Amplitude and Phase for S2(p)
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Non-Sun-Synchronous NSS Tides • Forced by zonal asymmetry in forcing (absorber
distributions; convective heating...), or mean state, or lower boundary (e.g. topography)
Sun-Synchronous Tides • Without zonal asymmetry in forcing (absorber
distributions; convective heating...), or mean state, or lower boundary (e.g. topography). Leads to a response which has amplitude only dependent on latitude and
• either constant phase (in local time) or uniform westward propagation (in Greenwich time)
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Eastward Westward
S=1 S=2 S=3 S=4 S=5
Zon
ally-symm
etric S=0 S=1 S=2 S=3 S=4 S=5
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Eastward Westward
Sun-Synchronous S1 Tide
S=1 S=2 S=3 S=4 S=5
S=1
S=2 S=3 S=4 S=5
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Eastward Westward
Sun-Synchronous S1 Tide
n=2 asymmetry
S=1 S=2 S=3 S=4 S=5
S=1
S=2 S=3 S=4 S=5
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Eastward Westward
Sun-Synchronous S1 Tide
n=2 asymmetry
Zonal wavenumber 2 topography
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Eastward Westward
Sun-Synchronous S1 Tide
n=2 asymmetry
Zonal wavenumber 2 topography
Zonal wave one Kelvin wave has natural period close to 1 sol
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Inviscid stratified ocean, rigid lid
Inviscid stratified atmosphere, radiation condition at “top”
Initially
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Inviscid stratified ocean, rigid lid
Inviscid stratified atmosphere, radiation condition at “top”
Initially
“ringing” normal modes
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Inviscid stratified ocean, rigid lid
Inviscid stratified atmosphere, radiation condition at “top”
Initially
“ringing” normal modes
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Inviscid stratified ocean, rigid lid
Inviscid stratified atmosphere, radiation condition at “top”
“ringing” normal modes
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Inviscid stratified ocean, rigid lid
Inviscid stratified atmosphere, radiation condition at “top”
“ringing” normal modes
G.I. Taylor showed that the free oscillations of the atmosphere had frequencies equal to those of a shallow water ocean of depth 10 km
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Zonal Wavenumber
S1
24 hour
S2
12 hour
Power spectrum of 77 years of hourly surface pressure observations at Djakarta (6oS)
.
Westward Propagation
Eastward Propagation
T. Matsuno
M. Longuet-Higgins Fr
eq
ue
ncy
-3 -2 -1 0 1 2 3
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Zonal Wavenumber
S1
24 hour
S2
12 hour
Power spectrum of 77 years of hourly surface pressure observations at Djakarta (6oS)
.
33 hou Westward Propagation
Eastward Propagation
33 hours
-3 -2 -1 0 1 2 3
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Zonal Wavenumber
S1
24 hour
S2
12 hour
Power spectrum of 77 years of hourly surface pressure observations at Djakarta (6oS)
.
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Zonal Wavenumber
33 hours
.
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Zonal Wavenumber
33 hours
.
Hamilton & Garcia (1986) noted that on Mars the period of the wave 1 Kelvin normal mode could be close to 1 sol.
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*Finer vertical resolution and higher
model “top” to treat upward propagating tides and the diurnal heating near ground
*Interactive dust in the atmosphere
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NASA AMES
NOAA GFDL
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NASA AMES
NOAA GFDL
Sponge Layer
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Mars Global Surveyer – Thermal Emission Spectrometer Data
90S EQ 90N
GFDL General Circulation Model
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Mars Global Surveyer – Thermal Emission Spectrometer Data
90S EQ 90N
GFDL General Circulation Model
W
E
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S1(p) amplitude (%of mean pressure) Boreal summer
Viking 1
“clear conditions”
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Time (sols)
Resonant
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S1(p) amplitude (%of mean pressure) Boreal summer
Phoenix
Viking 1
node node
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Generic Resonance Curve for An Oscillatory System with Monochromatic Forcing
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Applying globally uniform offset of air temperature (in dynamics, but not radiation)
Am
plit
ud
e o
f W
ave
-1 E
astw
ard
-Pro
pag
atin
g D
iurn
al P
ress
ure
Var
iati
on
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S1(p) amplitude (%of mean pressure)
Full Model
Model With Wave-2 Topography Removed
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S1(p) amplitude (%of mean pressure)
Full Model
Model With Wave-2 Topography Removed
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8 Pa
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S1(p) amplitude (%of mean pressure) Boreal summer
Phoenix
Viking 1
Curiosity
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? ?
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70 Pa
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70 Pa 70 Pa
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S1(p) amplitude (%of mean pressure) Boreal summer
Phoenix
Viking 1
Curiosity
Viking 2
Pathfinder
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S1(p) amplitude (%of mean pressure) Boreal summer
Phoenix
Viking 1
Curiosity
Viking 2
Pathfinder
25 pa
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Thank you!
(and thank the NASA engineers and the American taxpayers for the great Martian data!)