FORMOSAT-3
AMS Breakfast Meeting FORMOSAT-3/COSMIC
Mission15 January 2007
Welcome to a new era of Earth observations!
FORMOSAT-3/COSMIC launch picture provided by Orbital Sciences Corporation
14 April 2006Vandenberg AFB
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Global Coverage - 2500 Daily Soundings by early 2007 - all weather!
•Red - Daily average Radiosondes
•Green - Daily FORMOSAT-3/COSMIC Soundings
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
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Data user registration website:http://tacc.cwb.gov.tw/en/service/policy.htmor via http://www.cosmic.ucar.eduhttp://tacc.cwb.gov.tw/en/index.htm
* Select the 'Sign Up ' link under COSMIC
•Accept data use agreement
* Enter information: Name, Address, email, user_id,Password, planned use of data
• An email will be sent within 2-3 business days to indicateaccess has been granted.
Free and Open Data Access
~400 users have already registered
Free access to data
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Early Results-Weather
• Global coverage in all weather-sees through clouds!
• Accurate vertical profiles of water vapor
• Observing the atmospheric boundary layer
• Improvement of weather forecast models– Hurricanes and Typhoons– Antarctica– Improved accuracy of global weather models
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Vertical moisture profiles
Vertical profiles of water vapor pressure from two COSMIC satellites on 8 July 2006 are shown (in gray and red). The location is 21S, 71W.
The corresponding moisture profile from National Centers for Environmental Prediction (NCEP-NOAA) analysis is shown in green dots-line.
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First atmospheric boundary layer measurements from space.Sharp boundary (ABL top) at ~ 2 km altitude
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Low-level moisture change by assimilating GPS
GPS all GPS 1
Assimilate this sounding only
Fig. 8a
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2006-08-27-12Z (102h forecast)
Sat. IR No GPS
GPS all GPS 1
Fig. 8b
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Southern Hemisphere Forecast Improvements
Sean Healey, ECMWF
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Anomaly correlation as a function of forecast day for two different experiments:
- E (assimilation of operational obs), - BND (E + COSMIC bending angle).
Only COSMIC observations available in operations have been used in BND. Only COSMIC observations < 30 km These results might have been impacted by the development stage of the GSI system
Early impact experiments (T382) with COSMIC
Lidia Cucurull, JCSDA/UCAR
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December 2006 data latency -profile arrival at UKMO (FM1 70% < 3h)
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Diagnosis of errors in regional model forecasts over AntarcticaLow-level error statistics show influence of sea-ice representation
Blue = sea ice; Green = open water
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Data Quality
Climate
Space Weather
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Deviation of pairs of RO soundings separated by less than 10 km
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Precision of GPS RO soundingsComparison of PPUTLS by Region
0
0.1
0.2
0.3
0.4
0.5
0.6
0 50 100 150 200 250 300
Tangent Point Separation Distance (km)
PPMT
PPMT Tropics PPMT South MidLatitde PPMT South Polar PPMT North MidLatitude PPMT North Polar
PPUTLS = Precision Parameter of Upper Troposphere and Lower Stratosphere, which is the mean absolute differences in the 10-20 km layer
0.02% difference in refractivity, which is equivalent of 0.05 C in temperature Fig. 5b
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One Month (Sep. 06) COSMIC-CHAMP Comparison: 76 pairs, within 2 degree & 90 min
Fig. 12b
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Radio Occultation Temperature Record Data from three Missions
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a b c
Can we use GPS RO data to calibrate other instrument ?
N15, N16 and N18 AMSU calibration against COSMIC
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First collocated ionospheric profiles
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Count of Ionospheric Profiles
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Quiet
Storm
COSMIC #2 GAIM
COSMIC #2 GAIM
Comparisons during quiet and disturbed Conditions
Global Assimilation of Ionospheric MeasurementsUtah State University, (435)797-2962, [email protected];
Universities of Colorado (Boulder), Texas (Dallas), and Washington“Bringing the pieces together”
From presentation by Ludger Scherliess, Utah State University
Fig. 13a
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Comparison of NmF2 and HmF2 between COSMIC and GAIM during Apr. 21-28, 2006
Good agreement of NmF2 between COSMIC and GAIM;
Higher peak heights from GAIM than those from COSMIC
From presentation by Zhen Zeng, NCAR/HAO
Fig. 13b
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RED = COSMIC satBLUE = GPS sat
Formosat-3/COSMIC Observations of Scintillations
From presentation by Chin S. Lin, AFRL
Fig. 16
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TIP 135.6-nm passes 14 Sep 2006 FM1 FM3 FM6 0-24 UT
(2100 LT)
From presentation by Clayton Coker, NRLFig. 17
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Summary
• FORMOSAT-3/COSMIC a successful Taiwan-U.S. project• FORMOSAT-3/COSMIC launched nearly on time and within budget
(~$100M mission)• Cost-effective way of obtaining global atmospheric soundings in all
weather• High accuracy, precision and vertical resolution demonstrated• Already positive impact on weather models + hurricane forecasting• Observations of tropical boundary layer from space for first time• Only observing system to provide information on ionosphere, stratosphere
and troposphere• Expected to have major impact on climate monitoring-world’s most
accurate, precise and stable thermometer!• Free and open exchange of data— ~400 users already
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