remote sensing with navigation satellites · •gnss remote sensing (rs) has evolved to a powerful...
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Remote sensing with Navigation Satellites:
Overview and Applications in Polar RegionsJ. Wickert
C. Arras, G. Beyerle, M. Bender, Z. Deng, G. Dick, S. Heise, G. Michalak, M. Ramatschi, T. Schmidt,
H. Schuh, M. Semmling, S. Vey
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Propagation errors and remote sensing
Temperature and water vapor
Water and ice surfaces
Water vapor
Electron density
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Example: Ground based measurements, neutral atmosphere delay dA
Thanks: C. Rocken, UCAR
dA Zenith (~2.2 m)
dA 5°elevation (~ 25 m)
share of water vaporhere ~20%, very variable
GPS phase measurementis precise to ~ 1 mm
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GNSS Observation Infrastructure(Observation on different scales in space and time feasible)
COSMIC (6)TerraSAR-XTanDEM-X
GRACE
GPSGalileo
Airships, Aircrafts(HALO)Future Missones
(e.g. GRACE-FO)Global and
regional GNSSGround networks
GLONASS BEIDOU
Bouys, ships
Mini satelliteconstellations
(Studies)
Metop
ISS
QZSS
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Ground based
GNSS atmosphere sounding
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Vertically integrated water vapor
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GNSS ground stations
Ny Alesund, Spitsbergen
Potsdam, GFZ, Geodetic institute
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
German network (~300 stations)
Water vapor monitoring in Near-Real-Time
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Overlay plots with Meteosat-8 images
Overlay plots of Meteosat-8 (multi-channel) and GPS IWV for 20th of July 2007 (Fumiko Aoshima, Uni Hohenheim)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
3D water vapor from GNSS above Germany
Bender et al. [GFZ], 2010
Januar 18, 2007, Low pressure Kyrill
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GPS IWV results 2004-2008 in comparison (Bias) with ECMWF IWV.Accuracy ~1mm
Water vapor from a global network
~170 stations globally, some since 1994
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GNSS for Global Climate Observing System(GCOS, WMO)
GRUAN polar GNSS station
GCOS Reference Upper Air Network
GNSS is standard device forclimate monitoring
Data analysis at GFZ
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Satellite based
GNSS atmosphere sounding:
Radio occultation
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GNSS radio occultation
Key properties: global coverage, all-weather, calibration free, very precise, high vertical resolution
Very attractive for weather forecast, Climate and atmospheric research
Wickert , 2002
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
CHAMP (since 2000)
Metop (since 2006)FORMOSAT-3/COSMIC
(6; since 2006)
GNSS receivers for occultations on satellites
GFZ
GRACE (since 2002) TerraSAR/TanDEM-X
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Global water vapor from satellite GPS dataCHAMP + GRACE + COSMIC
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
e.g., Improvements of Typhoon forecasts with GPS: Ernesto (2006)
Without GPSWith GPS
Liu, NCARGPS data used for weather forecasts since 2006!
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Climate: Global temperature variations Observed with GPS und CHAMP/GRACE (10 years)
Preliminary results, Schmidt [GFZ] et al., 2009, subm.Schmidt et al. [GFZ], 2010
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Example: Stratospheric temperature variability
suddenstratosphericwarmings inpolar regions
• Disturbance of polar vortex, moreoften in Arctic
• Relevant for OzoneChemistry
• GNSS RO excellentobservation tool
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Ionosphere: Vertical electron density profilesand detection of disturbances
Sporadic E-Layer
Relevant for navigation, communication, Studies of atmospheric coupling processes
Wickert et al., 2009
GFZ processing Starting from raw-data level
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Global ionosphere monitoring mit GPS
Arras, PhD finished, available in english
Sporadic-E Results from CHAMP, GRACE, FormoSAT-3/COSMIC 2007/2008
Important phenomenon:~50% occurrence probability
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
A major challenge in
GNSS remote sensing:
Reflectometry
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Earth
LEO
GPSDirect signals
Reflected signals
Remote Sensing with Reflected GNSS
Thanks: T. Yunck
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Potential applications of GNSS reflectometry
• Weather: Wind direction and velocity; Specific humidity, Tomography Refractivity
• Climate: Ocean: Sea level, Sea Ice Coverage; Ice shelf altitude monitoring, Tide gauges in coastal regions, Salinity
• Ionosphere and Space Weather: Electron content imaging
• Disasters: Tsunami Early warning, Flood monitoring
• Soil moisture: land classification, biomass monitoring
• Snow: cover and depth, humidity content of snow
Wickert et al., EU-project report GfG², 2012
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Few basics GNSS-R Altimetry/Scatterometry
Path delay (lapse) Correlation and waveform
Altimetry
Scatterometry
R
RP
h
time
lapse
directsignal
reflectedsignal
Helm, 2008
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Advantages of GNSS vs. Radar Altimetry 2004 sumatra tsunami detected by JASON and simulated GNSS-R (GPS)* Signals are „free of charge“
* Many reflection points 2018: ~100 GNSS satellites
* High transmissivity at high rain rates (100 mm/h and more )
* Low-cost sensors aboard small satellites feasible (make future constellations feasible, sustainability of measurements)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Some examples:
GNSS reflectometry
at GFZ
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Disco bay, western GreenlandView from GPS observation location(~ 400 m above sea level)
Foto: M. Soerensen (DMI)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Ground based GNSS-R at Greenland
Measurements November 2008 until January 2009Data set for potential sea ice remote sensing
Cooperation with IEEC Barcelona within ESA project (GPS-SIDS)
GPS antenna (ca. 600 m above water/ice)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Monitoring of tides at Disco Bay with GPS
• Very promising results• max. tide amplitude ~ 2 m• Tide model in coastal region not optimal• Accuracy closely related to knowledge of atmospheric state (Synergy
Atmosphere sounding/Reflectometry)Semmling et al., 2011, GRL
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ Foto: M. Soerensen (DMI)
Outlook: Sea ice monitoring Kongsfjord, Spitsbergen
Installation of long-term GNSS reflectometry at Spitsbergen
Monitoring of water level and sea-ice
Comparison with in-situ and other satellite data (optical, SAR)
Kongsfjord,Spitsbergen
View from Zeppelinberg(GNSS observation point)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Flight experiments GNSS reflectometry
Bild: Christoph Hormann (earth.imagico.de)
Airship Zeppelin NT Research aircraft HALO
Sucessful campaigns September 2012, May 2014• Nearly identical setup as GEOHALO• Reflectometry for Geoid determination
at Bodensee region
June 2012 within the GEOHALO campaign• Reflectometry for ocean altimetry
Intial results: Semmling et al. (2013, 2014)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Airborne GNSS reflectometry: GEOHALO
RMS zum Geoid 5 .. 25 cm, depends on track,Comparison with radar altimetry planned
PRN 20
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Vision: GNSS reflectometry with HALO in AntarcticaProject ANTHALO with Technical University Dresden
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
New
GNSS reflectometry
experiment
aboard the ISS
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GPS (~30)Galileo (~30)
Atmosphere, Ionosphere,Water, Ice
Water &Ice
+Glonass (~24)
GNSS aboard ISS
Beidou (~30) Precise Orbit &Ionosphere
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
One focus of GEROS: Mesoscale Ocean Currents (Eddies)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
Mission objectives GEROS
Primary (Mission driving):Long-term GNSS based remote sensing of sea surfaceapplying coherent and incoherent reflectometry in the tropicsand mid-latitudes, Unique combination of coherent andincoherent reflectometry with the use of „large“ antennas, Secondary:Atmosphere sounding with GNSS several advantages compared to other missions: low inclination orbit (high SNR values Equator),polarimetriyoccultations, Multi-GNSS, additional information forreflectometryLand surface remote sensing with GNSS Soil moisture, snow, vegetation
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
HERE
GEROS: Where to mount?
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GEROS-ISS: Animation
Thanks: S. D‘Addio (ESA)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
GEROS-ISS: Coverage 24h
Thanks: S. D‘Addio (ESA)
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Potsdam Summer School, Arctic in the AnthropoceneJune 24, 2014, GFZ
•GNSS Remote Sensing (RS) has evolved to a powerful andversatile remote sensing method for numerous applications inweather/atmosphere research and climate change relatedinvestigations also in the polar regions
•A complex and operational GNSS infrastructure can be used toenable operational GNSS RS applications
•Atmosphere sounding reached operational application level,reflectometry is in focus of recent research
•GNSS RS has even more potential (e.g. new GNSS systems),numerous interdisciplinary challenges are waiting, internationalcooperation will increase effectiveness to meet these challenges
•Young scientists are very welcome to contribute to thesechallenging and fascinating developments!
Main conclusions