1. OverviewOne ascending orbit of dual polarization (No. 251) and one descending orbit of full polarization (No. 388) are chosen for comparisons of Tb_measurement and Tb_model1 under antenna frame.
- Figure 1: The ascending orbit of dual polarization (No. 251) and three zones for comparisons of Tb.
Information of this orbit is given in table 1.Table 1Ascending/Descending: AOrbit No: 251Validity time: 1119T132314 ~ 1119T141715Data version: 321_0022. Ascending orbit of dual polarization (No. 251)The zone of the ascending orbit is shown in Figure 1.There are 100 snaps (ID:2515408~2515527, Latitude: -44.5~-37.4(23.7)) in the blue box, 101 snaps (ID: 2515287~2515407) in the red box, and 69 snaps in the yellow box (ID:2515263~2515345). Is this zone, there is the Easter Island (27°08’S,109°22’W), which is in size of 163.6 km² (about 10% of SMOS’s foot-print), as shown by the red point in Figure 2.During that orbit, large wind speed variability occurs (Figure 2):
- Figure 2: Wind speed (orbit 251)
2.1. For 201 snaps in both blue and red boxesComparisons of Tb_measurement and Tb_model1 of 201 snaps in the blue and red boxes are shown in this section. There are 100 snaps for X polarization and 101 snaps for Y polarization.Figure 3 shows:3.a Top: The biases between Tb_measurement and Tb_model13.a Bottom: The standard deviations of Tb_measurement-Tbmodel 13.b Top: The standard deviations of Tb_measurement3.b Bottom: The standard deviations of Tb_model1
- Figure 3.a: Comparisons between Tb_measurement and Tb_model1
- Figure 3.b: Comparisons between Tb_measurement and Tb_model1
The standard deviations of Tb_measurement-Tbmodel 1 in the AFFOV appears lower than the standard deviation of Tb_measurement: for each point in the FOV, our model brings information consistent with the measurements!
X. Yin – J. Boutin, IPSL LOCEAN