Sea Surface Salinity from Space Teacher’s...
Transcript of Sea Surface Salinity from Space Teacher’s...
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AquariusAquariusSea Surface Salinity from Space
Teacher’s WorkshopSea Surface Salinity from Space
Teacher’s WorkshopFederation of Earth Science Information Partners (ESIP)
Gregg FotiPhysical Oceanography, Distributed Active Archive CenterPO.DAAC
July 8th, 2009
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OverviewOverview•
Why is ocean remote sensing important?
•
In Situ (place) measurements
•
Satellite Instruments, including Aquarius
•
Educational Tools & Activities
•
PO.DAAC Products
•
Why is ocean remote sensing important?
•
In Situ (place) measurements
•
Satellite Instruments, including Aquarius
•
Educational Tools & Activities
•
PO.DAAC Products
![Page 5: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/5.jpg)
Water cycle Ocean vs. LandWater cycle Ocean vs. Land
•
~70% of earth is covered by water•
Volume of water in oceans ~ 1.4 x 109
km3
–
24 times as much as glaciers and lakes–
100,000 times as much as the atmoshpere
holds •
Heat capacity is 1100 times higher than atmosphere
•
~70% of earth is covered by water•
Volume of water in oceans ~ 1.4 x 109
km3
–
24 times as much as glaciers and lakes–
100,000 times as much as the atmoshpere
holds•
Heat capacity is 1100 times higher than atmosphere
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Global Water Cycle FluxesGlobal Water Cycle Fluxes
•
Rainfall over oceans ~ 12 Sverdrups
(Sv, 1 Sv
= 1 million m3/s)
•
Rainfall over land ~ 3 Sv•
Evaporation over ocean ~ 13 Sv
•
Evaporation over land ~ 2 Sv•
Terrestrial Runoff ~1Sv
•
Water Cycle is dominated by ocean - atmosphere fluxes!
•
Rainfall over oceans ~ 12 Sverdrups
(Sv, 1 Sv
= 1 million m3/s)
•
Rainfall over land ~ 3 Sv•
Evaporation over ocean ~ 13 Sv
•
Evaporation over land ~ 2 Sv•
Terrestrial Runoff ~1Sv
•
Water Cycle is dominated by ocean - atmosphere fluxes!
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Conveyor BeltConveyor Belt
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In Situ MeasurementsIn Situ Measurements
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Rosetta BottlesRosetta Bottles
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SalinometerSalinometer
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Samantha MillerSamantha Miller
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Mooring DesignMooring Design
RDI ADCP
3/8” chain
1000 lb. for 4 CFR
500 lb. for 5 CFRCT Sensor
(SBE 16 Plus)
15m depth – 30 m chain
20m depth – 40 m chain
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•
CTD•
Conductivity
•
Temperature•
Depth (pressure)
•
CTD•
Conductivity
•
Temperature•
Depth (pressure)
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CTDCTD
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Moor OverboardMoor Overboard
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Coast Guard Cutter 109Coast Guard Cutter 109
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Narrows SalinityNarrows Salinity
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GliderGlider
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Glider SpecsGlider Specs••Glider SpecificationsGlider Specifications•• Weight:Weight:52 Kg52 Kg•• Diameter:Diameter: 21.3 cm21.3 cm•• Length:Length:1.5 meters1.5 meters•• Depth Range:Depth Range:4 4 -- 200 meters200 meters•• Speed:Speed:0.4 m/sec0.4 m/sec•• Energy: Energy: Alkaline BatteriesAlkaline Batteries•• Endurance: ~Endurance: ~30 days30 days•• Range:Range:1500 km1500 km•• Navigation: Navigation: GPS,internalGPS,internal dead reckoning, altimeterdead reckoning, altimeter•• Sensor Package: Sensor Package: Conductivity, Temperature, DepthConductivity, Temperature, Depth•• Communications:Communications: satellite telephone, satellite telephone, FreewaveFreewave RadioRadioARGOS satelliteARGOS satellite
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Aquarius
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RequirementsRequirements
•
390 km swath•
8 samples per month near equator
•
0.2 psu
(0.0002) accuracy after temporal averaging over a month
•
Temporal Resolution 1 month•
Spatial Resolution 100km
•
390 km swath•
8 samples per month near equator
•
0.2 psu
(0.0002) accuracy after temporal averaging over a month
•
Temporal Resolution 1 month•
Spatial Resolution 100km
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Instrument SpecificationsInstrument Specifications
•
Radiometer & Scatterometer–
Footprint size -
76x94, 84x120, 96x156
–
Orbit 657 km Sun Synchronous
•
Radiometer –
Frequency ν
= 1.413 GHz +/-
25MHz
–
Wavelength λ
= c/ν
~ 0.212m–
L band = 0.39 -
1.55 GHz
•
Radiometer & Scatterometer–
Footprint size -
76x94, 84x120, 96x156
–
Orbit 657 km Sun Synchronous
•
Radiometer –
Frequency ν
= 1.413 GHz +/-
25MHz
–
Wavelength λ
= c/ν
~ 0.212m–
L band = 0.39 -
1.55 GHz
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ScatterometerScatterometer
•
Frequency ν
= 1.26 GHz•
Wavelength λ
= c/ν
~ 0.238m
•
Frequency ν
= 1.26 GHz•
Wavelength λ
= c/ν
~ 0.238m
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Orbit Altitude vs. Orbit TimeOrbit Altitude vs. Orbit Time
Fcentrifical
= Fgravity
Fg
= GMm/r2
Fc
= ma = m ∆v/∆t d = v ∆tt = 2πr/v t = 2πv/a r/v
= v/a a = v2/r
Fc
= m
v2/r = GMm/r2 v2
= GM/r (no sat. mass)
v = 2πr/t 4π2r2/t2
= GM/r t2
= 4π2r3/(GM)
Fcentrifical
= Fgravity
Fg
= GMm/r2
Fc
= ma = m ∆v/∆t d = v ∆tt = 2πr/v t = 2πv/a r/v
= v/a a = v2/r
Fc
= m
v2/r = GMm/r2 v2
= GM/r (no sat. mass)
v = 2πr/t 4π2r2/t2
= GM/r t2
= 4π2r3/(GM)
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t2
= 4π2r3/(GM) G = 6.67E-11 Nm2 kg-2 Me
= 6E24 kgN = kg m s-2
Re
= 6378 km mean altitude of satellite = 657kmr = 6378km + 657km = 7035km�t2
= 4π2(7035km (1000m/km))3
6.67E-11 kg m s-2
m2 kg-2
6E24 kg
t ~ 97 2/3 minutes
t2
= 4π2r3/(GM) G = 6.67E-11 Nm2 kg-2 Me
= 6E24 kgN = kg m s-2
Re
= 6378 km mean altitude of satellite = 657kmr = 6378km + 657km = 7035km�t2
= 4π2(7035km (1000m/km))3
6.67E-11 kg m s-2
m2 kg-2
6E24 kg
t ~ 97 2/3 minutes
Orbit Altitude vs. Orbit TimeOrbit Altitude vs. Orbit Time
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•
Ocean remote sensing from space is the only practical way to obtain global coverage of ocean surface properties
•
In Situ (place) measurements important for below surface measurements and for validating satellites
•
Ocean remote sensing from space is the only practical way to obtain global coverage of ocean surface properties
•
In Situ (place) measurements important for below surface measurements and for validating satellites
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Will present two activities:• Hands-on lab
• Online data toolsGoal is to demonstrate how these complementary activities
support this "Big Idea":Salt causes water to freeze at a lower temperature. The oceans do not freeze -- and are layered -- because of salinity (and this is
critically important to the overall earth system).
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This map shows a seven- day average, based on all known measurement
locations sampled over the past 100 years for Sea Surface Salinity (SSS)
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Not presently measured by satellite, this map shows the weekly SSS coverage that
will be achieved by Aquarius after its 2010 launch
Aquarius / SAC-D is a jointU.S. (NASA) -
Argentine
(CONAE) venture
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Aquarius instrument accuracy will be 0.2 psu*. How much salt should be added to 1 gallon of water to change its salinity by 0.2 psu?
• 1 tablespoon• 1 teaspoon• 1/2 teaspoon• 1/6 teaspoon•*Used to describe the concentration of dissolved salts in water,the UNESCO Practical Salinity Scale of 1978 defines salinityin terms of a conductivity ratio, so it is dimensionless. Salinitywas formerly expressed in terms of parts per thousand or byweight (parts per thousand or 0/00). That is, a salinity of 35 pptmeant 35 pounds of salt per 1,000 pounds of seawater. Openocean salinities are generally in the range between 32 and 37.
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Aquarius instrument accuracy will be 0.2 psu*. How much salt should be added to 1 gallon of water to change its salinity by 0.2 psu?
• 1 tablespoon• 1 teaspoon• 1/2 teaspoon• 1/6 teaspoon•*Used to describe the concentration of dissolved salts in water,the UNESCO Practical Salinity Scale of 1978 defines salinityin terms of a conductivity ratio, so it is dimensionless. Salinitywas formerly expressed in terms of parts per thousand or byweight (parts per thousand or 0/00). That is, a salinity of 35 pptmeant 35 pounds of salt per 1,000 pounds of seawater. Openocean salinities are generally in the range between 32 and 37.
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The mission will help answerquestions about how our
oceans respond to climate change and the water cycle.
Like on land, some areas of the ocean are rainy whereas
others are arid. Aquarius SSS data will reveal the water
cycle's ever-changing "fingerprint."
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SSS maps can be used to directly track variations in the water cycle such as river runoff, sea ice freezing & melting, ocean
evaporation & precipitation:
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These concepts are directly aligned with content knowledge Standards & Benchmarks:
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These concepts are directly aligned with content knowledge Standards & Benchmarks:
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These concepts are directly aligned with content knowledge Standards & Benchmarks:
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“Salinity Patterns & theWater Cycle”
module recently
rated “Very Good-Outstanding”
by NASA Earth Science Education Products
Review panel.
Includes nine activities aligned with physical sciences standards for elementary through high school
students.
http://aquarius.nasa.gov/education.html
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Each activity follows the format:•
Big Idea
•
Key Concepts•
Essential Questions
•
Knowledge and Skills•
Prior Knowledge
•
Common Preconceptions
And is linked to the comprehensive concept map: “Water & its patterns on Earth’s surface”
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”Can Sea Water Freeze?" is a middle school activity
•
Let's begin the experiment!
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Students in action!
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Students in action!
![Page 50: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/50.jpg)
For complementary online activities,let's visit the prototype website:
http://aquarius.jpl.nasa.gov/
![Page 51: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/51.jpg)
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 52: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/52.jpg)
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 53: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/53.jpg)
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 54: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/54.jpg)
Can choose up tosix locations at once
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 55: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/55.jpg)
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 56: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/56.jpg)
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 57: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/57.jpg)
Annual mean maps & In-water profiles: Salinity, temperature & density
![Page 58: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/58.jpg)
Monthly mean maps
& Time-series
graphs
Salinity, Temperature &
Densityfrom 1 -
6
depths!
![Page 59: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/59.jpg)
Monthly mean maps
& Time-series
graphs
Salinity, Temperature &
Densityfrom 1 -
6
depths!
![Page 60: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/60.jpg)
Monthly mean maps
& Time-series
graphs
Salinity, Temperature &
Densityfrom 1 -
6
depths!
![Page 61: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/61.jpg)
Monthly mean maps
& Time-series
graphs
Salinity, Temperature &
Densityfrom 1 -
6
depths!
![Page 62: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/62.jpg)
Monthly mean maps
& Time-series
graphs
Salinity, Temperature &
Densityfrom 1 -
6
depths!
![Page 63: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/63.jpg)
Monthly mean maps
& Time-series
graphs
Salinity, Temperature &
Densityfrom 1 -
6
depths!
![Page 64: Sea Surface Salinity from Space Teacher’s Workshopcimss.ssec.wisc.edu/teacherworkshop/esip/Foti.pdf · Aquarius . SSS data will reveal the water cycle's ever-changing "fingerprint."](https://reader033.fdocuments.in/reader033/viewer/2022060605/6059d9157a84ee68ee47cd13/html5/thumbnails/64.jpg)
podaac.jpl.nasa.govGregg FotiPO.DAAC Data [email protected]
aquarius.nasa.govAnnette [email protected]
podaac.jpl.nasa.govGregg FotiPO.DAAC Data [email protected]
aquarius.nasa.govAnnette [email protected]