Version-0 5 GHz brightness temperatures only 13 Sept 2011

Browse ImagesHIRAD (Hurricane Imaging Radiometer)

Timothy L. Miller, NASA/MSFC, P.I.256.961.7882, [email protected]

Co-investigators: Linwood Jones (Univ Central Florida), Chris Ruf (Univ Michigan), Eric Uhlhorn (NOAA/AOML/HRD)

Team members: Mark James, Peter Black, Courtney Buckley, Sayak Biswas, Cathy May, Brent Roberts, Cerese Albers, Lori Schultz, Robert Atlas, James Johnson

Images and datasets produced by Cathy May, Univ. Central Florida

Version-05 GHz brightness temperatures only

13 Sept 2011

HIRAD - GRIP Browse Images v.0• All images are excess TB in units of Kelvin at 5 GHz

– Excess TB is HIRAD observed TB, minus calculated TB for calm, no-rain ocean surface at the given off-nadir angle. It is preferred in order to eliminate the incidence angle effect, thus enabling easier identification of geophysical features in the data.

– HIRAD observed 5 GHz TB is included in the provided datasets but not plotted here• Brightness temperatures for other frequencies and subsequent

geophysical retrievals are still being developed at the time of this release (9 Sept 2011)

• HIRAD flights for Earl (1-2 Sept) and Karl (16 Sept) are processed• Datasets are provided in Matlab and NETCDF formats and include all

necessary information such as time and geographic location of each observation

• Earl images are plotted out to +/- 70 degrees from nadir• Karl images are plotted out to +/- 65 degrees from nadir• Legs plotted here and provided in the datasets are for straight and level

flight, as determined by constant true heading of the aircraft. • Along-track “striping” on some swaths is indicative of unresolved

calibration issues. This feature is eliminated in the directory “filtered”

Hurricane EARL September 1-2, 2010

1

2

3

4

5

6

HIRAD / WB-57 flight track, 1-2 Sept 2010Start

End

Circles indicate start of leg 1 and end of leg 6

Earl, 2320 UTC, in 85GHz (SSMIS F16, image courtesy NRL)Triangle indicates WB-57/HIRAD position

Earl, 0059 UTC, in 85GHz (SSMIS F18, image courtesy NRL)Triangle indicates WB-57/HIRAD position

EARL storm center information

leg 1 start 23:24:11leg 6 end 1:36:22

Time frame of EARL legs

Observed Storm Centers September 1 – 2, 2010

Date Time Lat Lon Source9/1 18:00:00 25.90 -72.70 Best track9/1 23:50:27 27.00 -73.42 P-39/2 1:13:51 27.34 -73.62 P-39/2 5:29:10 28.43 -74.32 C-130

EARL Leg Times

Leg Date Start Stop1 9/1 23:24:11 23:41:162 9/1 23:44:57 23:50:473 9/1 23:52:35 0:17:394 9/2 0:33:12 1:02:465 9/2 1:04:12 1:11:476 9/2 1:13:46 1:36:22

• In the next 3 slides, storm centers as determined by the NOAA P-3 aircraft, given on slide 7, were used to construct a storm-centric coordinate system.

Leg-1

Leg 6

Leg 2Leg 3

Leg 4Leg 5

EARL legs, +/- 70 degree swaths

Storm-centric Latitude and Longitude

Leg-1

Leg 3

EARL legs 1&3, +/- 70 degree swaths


Leg 6

Leg 4


EARL legs 4&6, +/- 70 degree swaths

EARL Leg 1 +/- 70 degree swath

Hurricane KARLSeptember 16, 2010

HIRAD / WB-57 flight track and legs definitions

2

1

3

4

6

10

8

StartEnd

5

7

9

KARL 16 Leg Times

Leg Date Start Stop2 9/16 19:01:14 19:26:393 9/16 19:29:36 19:41:464 9/16 19:43:50 20:06:205 9/16 20:08:41 20:18:416 9/16 20:22:49 20:41:597 9/16 20:45:53 20:55:538 9/16 20:58:47 21:17:329 9/16 21:19:43 21:23:53

10 9/16 21:32:32 21:50:52

Leg 2 19:16:49 19.74 -93.38Leg 4 19:52:37 19.76 -93.46Leg 6 20:33:34 19.80 -93.59Leg 8 21:11:51 19.82 -93.67

Leg 10 21:39:55 19.79 -93.74

Hurricane KARL, September 16, 2010 Subjectively-Determined HIRAD Storm

Centers

All of the following storm-centric plots use the storm centers observed by HIRAD, as shown above.

KARL legs 2-3-4-5-6, +/- 65 degree swaths


Leg 2

Leg 6

Leg 4

Leg 5

Leg 3

KARL legs 10-9-8-7-6, +/- 65 degree swaths


Leg 8

Leg 6

Leg 10

Leg 7

Leg 9

KARL Leg 2 +/- 65 degree swath

HIRAD storm center observationTime: 19:16:49Lat: 19.74Lon: -93.38

KARL Leg 10 +/- 65 degrees swath


Sequential Legs

• All plots are excess TB at 5GHz, at +/- 65 degrees from nadir.

• Sequential plots show the progression of the storm.

• The plots use HIRAD observed storm centers to determined storm-centric latitude and longitude.

KARL Legs 2,4 +/- 65 degree swath

Version-0 5 GHz brightness temperatures only 13 Sept 2011

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