Change of Microwave Radiation under Different Oceanic Conditions

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Presentation transcript:

Change of Microwave Radiation under Different Oceanic Conditions - Results from Comparison between AMSR and SeaWinds on ADEOS-II - Akira Shibata EORC / JAXA NOAA-NASA Workshop, Feb.8-10, 2005, at FIU

Research Purpose Under what kind of parameters does the ocean microwave emission change ? SST Wind speed and direction Air-Sea temperature difference Swells Examples of anomalous emission, which may be due to air-sea temperature difference Arabian Sea in summer Off California coast

Sensors AMSR and SeaWinds on ADEOS-II Launched on Dec. 14, 2002 Stopped on Oct. 25, 2003 Data from Apr. to Oct., 2003

AMSR’s Two Parameters for Ocean Wind 1. S36 from 36GHz S36=(T36H – s*T36V + k ) / atmos_corr s & k : constants 2. 6H from 6GHz 6H=T6H_obs – atmos_effect - T6H_calm

Graphical explanation of S36

Anisotropic feature of S36 for relative wind direction SeaWinds Wind speed S36 (K) Relative wind direction (degree)

Anisotropic feature of 6H for relative wind direction 6H (K) Relative wind direction (degree)

Relation between 6H and S36 for various relative wind directions Ascending orbit in S.H 16m/s upwind downwind 7m/s 7m/s

Comparison of ascending and descending orbit data May, 2003 in S.H.

Comparison of ascending and descending orbit data June, 2003 in S.H.

Comparison of ascending and descending orbit data July, 2003 in S.H.

Geometry of AMSR looking direction and wind direction in S.H. Descending orbit Ascending orbit Upwind Southern wind (cold air) Downwind Northern wind (warm air) Upwind Northern wind (warm air) Downwind Southern wind (cold air)

Next Slides April versus October in S.H.

Comparison of ascending and descending orbit data April, 2003 in S.H.

Comparison of ascending and descending orbit data October, 2003 in S.H.

Comparison of significant wave height between April and October (From ERA)

Comparison of air-sea temperature difference between April and October 2003 April October

Next Slides S.H. versus N.H. in April

Comparison of ascending and descending orbit data April, 2003 in S.H.

Comparison of ascending and descending orbit data April, 2003 in N.H.

Summary •Two parameters (6H and S36) of AMSR are different between ascending and descending orbits under strong wind. • Those parameters are also different among seasons, and also between southern and northern hemispheres. • An order of the difference at 16m/s is 1K or so. • One explanation of the difference is air-sea temperature difference.