TU4.T10.5.ppt
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This document analyzes the polarimetric characteristics of mesoscale cellular convection (MCC) observed in Synthetic Aperture Radar (SAR) imagery and compares them to the polarimetric characteristics of open ocean surfaces. MCC areas showed higher values of co-polarization phase difference, entropy (H), and alpha angle (α) compared to typical ocean surface values. The document presents SAR and auxiliary meteorological data used to analyze MCC conditions and validates the SAR signals as MCC. It concludes that polarimetric parameters show potential for distinguishing atmospheric convection from open ocean surfaces in SAR imagery.
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TU4.T10.5.ppt
- 1. On polarimetric characteristics of mesoscale cellular convection in the marine atmospheric boundary layer Haiyan Li, William Perrie, Lanli Guo ， Biao Zhang 2011 IEEE International Geoscience and Remote Sensing Symposium 24-29 July Vacouver, Canada
- 3. Motivation ‘ Blister’ like provided inFig 7 in Babin et al.(2003)
- 6. RS-2 Quad-Pol UTC 05:05:35 on Feb. 2, 2009, RADARSAT-2 Data and Products© MacDonald, Dettwiler and Associates Ltd. (2008- 2009) - All Rights Reserved . A B C
- 7. MODIS data at 22:10:00 UTC on 1 Feb. and 7 hours before SAR; ‘ ’ represents SAR image. The MODIS image suggests that convection did occur from the morphology and that the SAR image area appears to be a transition zone between open and closed convection.
- 19. Polarimetric Characters of convection (continuous) 0.37 0.32 0.34 A 51° 40° 38° α 0.68 0.60 0.57 H 70° 43° 20° ϕ hhvv Area C Area B Area A roughness 0-1 A type 0-90° α randomness 0-1 H Odd, even bounce 0-180° ϕ hhvv Meaning Range
- 22. Polarimetric charateristics of open ocean The distributions do not show any obvious regular pattern and the actual variations are small, resulting from variations in these four parameters. The range is limited between 0 o to 6 o . Area A Area B AreaC ϕ hhvv 20° 43° 70°
- 23. Polarimetric charateristics of open ocean H clearly tends to increase with increasing incidence angles, for each of the three sea state parameters. There are a few exceptional cases, however. When wind speeds are larger than 2 m/s, the largest H value is less than 0.55; the maximum value for H is ~ 0.68. Area A Area B AreaC H 0.57 0.60 0.68
- 24. Polarimetric charateristics of open ocean increases with increasing incidence angles, for each of the three sea state parameters. There are a few exceptions to this trend, however. Except for the maximum in , when wind speed is about 2 m/s, the variation in is from 3 o to 25 o , and taking its standard deviation into account, the variation of is from 2 o to 27 o , which is smaller than that of MCC. Area A Area B AreaC α 38° 40° 51°
- 25. Polarimetric charateristics of open ocean A generally tends to decrease with increasing incidence angles. Area A Area B AreaC A 0.34 0.32 0.37
- 28. 谢谢！ Thanks！ Comments and suggestions are welcomed! [email_address]
Editor's Notes
- December 2008 to February 2010
- Air pressure field for UTC 06:00:00 on 2 February 2009 obtained from NARR data, showing (a) mean sea level pressure, (b) 500hPa, and (c) 200hPa
- on 2 February 2009 at (49.67oN 170oW), where the y-axis is pressure in hPa and the x-axis represents temperature (K). Black and green symbols represent temperature profiles at UTC 03:00 and UTC 06:00.
- Despite the spatial and temporal offsets of the SSM/I and QuikSCAT data and the coarse resolution of the NARR data relative to the SAR image, they do provide an overview of the meteorological conditions. In addition to temperature and wind measurements, the fact that there probably was no strong precipitation in the test area in the preceding 30 hours is important for interpretation of the SAR image.
- Vertical profile of the vertical velocity [jLS1] along 170.01oW. SAR image extends from 49.52oN to 49.85oN on the transect at 170.01oW as indicated by red vertical lines on the x-axis of (c). (d) Vertical profile of vertical velocity along 49.65oN, with SAR image extending from 170.17oW to 169.71oW as indicated by red vertical lines on the x-axis. The colorbars denote vertical wind speed, in units of m/s. [jLS1] What are the units on the colorbar?
- accumulated precipitation of WRF estimates from UTC 18:00 on 1 February to UTC 05:05 on 2 February 2009. The parallelogram in (a) and (b) represents the SAR imaging area. The colorbar in (b) denotes the accumulated precipitation, in units of mm.
- Randomness
- Variation of co-polarization phase differences for the open ocean at different incidence angles, wind speeds, significant wave heights and wave steepness. even though the standard deviation is taken into account in each bin.
- Variation of entropy for the open ocean at different incidence angles, wind speeds, significant wave heights and wave steepness.
- Variation of entropy for the polarimetric scatter angle at different incidence angles, wind speeds, significant wave heights and wave steepness.
- Variation of anisotropy for the open ocean at different incidence angles, wind speeds, significant wave heights and wave steepness.