AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD...

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AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD [email protected]

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Page 1: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

AMSR-E Sea Ice Products

Thorsten Markus

NASA Goddard Space Flight Center

Greenbelt, MD

[email protected]

Page 2: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.
Page 3: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Footprint size

58 km

37 km

21 km

11 km

5 km

Level 2A TBs

Page 4: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Arctic and Antarctic:

NASA Team2 NASA Team 2 - AMSR Bootstrap

Arctic and Antarctic:

NASA Team2 NASA Team 2 - Bootstrap

Page 5: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

AMSR Bootstrap/Ice temperature

Footprint size

58 km

37 km

21 km

11 km

5 km

Page 6: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

AMSR Bootstrap/Ice temperature

Bootstrap

Footprint size

58 km

37 km

21 km

11 km

5 km

Page 7: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

AMSR Bootstrap/Ice temperature

Bootstrap

NASA Team 2/Snow depth

Footprint size

58 km

37 km

21 km

11 km

5 km

Page 8: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Ice concentration algorithms

Algorithms: Channels used:NASA Team 2: 19V, 19H, 22V, 37V, 89V, 89HBootstrap: 19V, 37V, 37HAMSR Bootstrap: 6V, 19V, 37V

NASA Team 2: Overcomes some of the problems of the “original” NASA Team algorithm through the additional use of the 89 GHz channels. Usage of these requires correction for atmospheric effects, which is done utilizing radiative transfer modeling.

Bootstrap (for 12.5 km product):“Standard” Bootstrap with the difference that 37H was previously only used for the Arctic but is now used for both hemispheres.

AMSR Bootstrap (for 25 km product):Accounts for temperature effects in the ice concentration retrievals using 6 GHz data.

Page 9: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Jan. 6, 2006

Sep. 20, 2005

Page 10: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Snow depth on sea ice

Approach: Similar to snow on land; difference in snow scattering between 19 and 37 GHz

Input data: TB(19V), TB(37V), NT2 ice concentration

Notes:

• 12.5 km grid product

• 5-day averages; temporal information is used to flag wet snow

• no snow depth retrievals over multi-year ice

• maximum retrievable snow depth about 50 cm (penetration depth @37GHz)

Jan. 6, 2006 Sep. 20, 2005

Page 11: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Ice temperature

Approach: Part of the AMSR Bootstrap (ABA) ice concentration algorithm; TB=e Ti

Input data: TB(6.9V), ABA ice concentration

Notes:

• Temperature of (or close to) snow-ice interface

• 25 km grid product

TB = e Ti

TB(6V); NT2 sea ice concentration

Jan. 6, 2006 Sep. 20, 2005

Page 12: AMSR-E Sea Ice Products Thorsten Markus NASA Goddard Space Flight Center Greenbelt, MD Thorsten.Markus@nasa.gov.

Comments from the community:

- HDF-files are large (about 50 MB @ 12.5 km) for each day.

- HDF is not easy to handle (suggestions for additional data formats included geoTIFF etc.).

- No separate sea ice concentration product.

- Requests for monthly ice concentration maps.

- Passive microwave ice drift/ice motion is widely used; should it become a standard product?


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