# Presentation: 915279

## New L-band Imaging Radiometer takes to the Air Down Under

- There are 3 airborne campaigns planned in Australia (map, lower left) during 2005-06, prinicpally for soil moisture.  The objectives include validation of soil moisture retrieval algorithms for _AMSR-E_, _SMOS_, and _Hydros_ as well as developing downscaling and assimilation techniques to obtain high resolution retrievals from low resolution space-borne measurements (figures, upper left). Dr. Kim will be participating in the first campaign in May 2005.

- Edward Kim, Instrumentation Sciences Branch,
- Hydrospheric & Biospheric Sciences Laboratory, NASA GSFC (edward.j.kim@nasa.gov)

***Terms:***
_**AMSR-E**_--Advanced Microwave Scanning Radiometer for _EOS_
_**SMOS**_--Soil Moisture and Ocean Salinity
_**Hydros**_--Hydrosphere States Mission
_**EOS**_--Earth Observing System

## New L-band Imaging Radiometer takes to the Air Down Under

- PLMR flies on an inexpensive light aircraft, a Diamond Eco-Dimona.  At low altitude, resolution can be 50 meters.

- NASA/GSFC-inspired calibration target.

- 36km radiometer
-  inverse

- 3km radar inverse

- 3km combined
- retrieval

- Error in 3km soil
- moisture content
- (Zhan et al)

- Downscaling of Passive/Active derived
- Soil moisture: Needs to be tested with
- real data!

- Australian Polarimetric L-band Multibeam Radiometer (PLMR) installed.

## Results from MODIS/Aqua Reprocessing inMarch 2005

**Gene Feldman, Ocean Sciences Branch,**** Hydrospheric & Biospheric Sciences Laboratory, NASA GSFC (gene.c.feldman@nasa.gov)**

**Results from MODIS/Aqua Reprocessing in****March 2005**

## Results from MODIS/Aqua Reprocessing inMarch 2005

- SeaWiFS-MODIS/Aqua agreement to within 7% for global mean deep-water normalized water-leaving radiance retrievals (Lwn).  Better for clear water.

**Initial Processing**

**Reprocessing**

**Ratios of Lwns:  MODIS/SeaWiFS**

## Complex Permittivity of Antarctic Sea Ice

- Accurate interpretation of satellite passive microwave sea ice data requires the knowledge of the complex _permittivity_ of the surface at appropriate frequencies.
- These figures provide the first measurements of Antarctic sea ice permittivity as a function of salinity, and reveals the potential of discriminating various types of seasonal sea ice based on their brine content.

- Joey Comiso, Cryospheric Sciences Branch, Hydrospheric
- & Biospheric Sciences Laboratory, NASA GSFC
- (josefino.c.comiso@nasa.gov

***Terms:***
_**Permittivity**_-measure of the ability of a material to resist the formation of an electric field within it

## ICESat - Insights on Ice ShelvesChristopher Shuman, Cryospheric Sciences Branch, Hydrospheric & Biospheric Sciences Laboratory, NASA GSFC (christopher.a.shuman@nasa.gov)

**ICESat Laser 2a data shows elevation distributions across Antarctica’s Ross Ice Shelf (see ICESat track map at lower left, previous slide).**
**Higher elevation ‘bulges’ (up to 100 m, in red) show the relatively greater ice flow associated with Ice Streams Whillans and Bindschadler (B and D, respectively) as well as lower elevations associated with ‘**_**quiescent**_**’ Ice Stream Kamb (C) around Siple Dome.  Ice shelf thickness maps reveal the history of ice flow from the interior (Fahnestock et al., 2000).**
**ICESat Track 0351 (see small track map across Antarctica) was obtained through clear-skies and crosses from the Crary Ice Rise to the margin of the Ross Ice Shelf and then across Iceberg B-15A.**
**ICESat data can be ‘inverted’ via regression equation from Bamber and Bentley (1994) to estimate ice shelf thickness across the Ross Ice Shelf and Iceberg B-15A (see profile at top).**
**Variations in ice shelf thickness and the location of grounding lines are critical indicators of ice sheet stability through time.**

***Terms:***
_**Quiescent**_***-***quiet, at rest, but not necessarily dormant, and having the potential for resumed activity

## ICESat - Insights on Ice Shelves

**Christopher A. Shuman**
**ICESat Deputy Project Scientist **
**and Vijay P. Suchdeo - NVI Inc.**

**Box outlines area at left and profile above**