PASSIVE MICROWAVES Figure 5-2 Sensitivity of brightness temperature to geophysical parameters over ocean surface.

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Presentation transcript:

PASSIVE MICROWAVES

Figure 5-2 Sensitivity of brightness temperature to geophysical parameters over ocean surface

Sensitivity of brightness temperature to geophysical parameters over land surfaces

O 2 absorption spectrum along a vertical path around 60 GHz (multiple absorption lines)

Global composite of radiance temperature (K) measurements from AMSU-A Channel 3

Water vapour absorption spectrum along a vertical path around GHz

Global composite of radiance temperature (K) measurements from AMSU-B Channel 3

WEB(s) sites fore more infos ( starting next november 2002 ) Frequency protection ( Rochard poster near the end)

Spectrum requirements for passive sensing of environmental data Frequency Band(s) (1) (GHz) Total BW required (MHz) Spectral Line(s) or Centre frequency (GHz) Measurement Scan mode N, L (4) s, P Soil moisture, ocean salinity, sea surface temperature, vegetation index N s, s, P Ocean salinity, soil moisture, vegetation index N s, s Sea surface temperatureN Sea surface temperatureN p, P Rain rate, snow water content, ice morphology, sea state, ocean wind speed N

TABLE 1 Performance Criteria for Passive Remote Sensing of Environmental Data Frequency Band(s) (1) (GHz) Total BW required (MHz) Required  T e (K) Data availability (%) (7) Scan Mode (N, L) (4) s, P N s, s, P N s, s /0.05 (6) 99.9N /0.05 (6) 99.9N p, P /0.1 (6) 99.9N s, P N p2001.0/0.1 (6) 95/99.9 (6) N p2000.2/0.05 (6) 99/99.9 (6) N p3000.4/0.05 (6) 99/99.9 (6) N P N

Some big problems to solve … 1)To conclude what is needed above 275 GHz (central frequencies and bandwidths) 2)To conclude about ‘Delta T ‘ tables betweenWMO and ITU proposal 3)To conclude on % of data availability 4)To archive emissivity pictures of the Earth in microwaves below 50 GHz.