1 TRMM Microwave Measurements during Hurricane Katrina: Vertical Polarization The TMI instrument on the TRMM satellite measures microwaves emitted from the Earth's land and water. By comparing emission from different microwave frequencies, the characteristics of ice and water in the atmosphere can be determined. For example, 85 GHz microwaves are scattered by ice crystals in tropical cyclones, making cyclone rain bands appear 'colder' than the surrounding areas. By comparing 85 GHz temperatures in different polarizations with other frequency band measurements, accurate measurements of rainfall in the atmosphere can be made. This animation shows eight days of global TMI 85 GHz measurements in the Gulf of Mexico during Hurricane Katrina. The hurricane Katrina rainbands clearly show up in these images. Animation (512x512) Vertically polarized 85GHz microwave brightness temperatures measured by the TMI instrument on TRMM from August 22, 2005 through August 30, 2005, during Hurricane Katrina. 1 0 2005-08-22T24:00:00Z 2005-08-31T17:59:59Z 2005-08-22 24 1 1 2005-08-22T24:00:00Z 2005-08-23T04:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0000.png 10 40 -100 -70 2005-08-23 05 1 1 2005-08-23T05:00:00Z 2005-08-23T22:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0001.png 10 40 -100 -70 2005-08-23 23 1 1 2005-08-23T23:00:00Z 2005-08-24T05:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0002.png 10 40 -100 -70 2005-08-24 06 1 1 2005-08-24T06:00:00Z 2005-08-24T21:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0003.png 10 40 -100 -70 2005-08-24 22 1 1 2005-08-24T22:00:00Z 2005-08-25T04:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0004.png 10 40 -100 -70 2005-08-25 05 1 1 2005-08-25T05:00:00Z 2005-08-25T22:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0005.png 10 40 -100 -70 2005-08-25 23 1 1 2005-08-25T23:00:00Z 2005-08-26T03:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0006.png 10 40 -100 -70 2005-08-26 04 1 1 2005-08-26T04:00:00Z 2005-08-26T21:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0007.png 10 40 -100 -70 2005-08-26 22 1 1 2005-08-26T22:00:00Z 2005-08-27T03:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0008.png 10 40 -100 -70 2005-08-27 04 1 1 2005-08-27T04:00:00Z 2005-08-27T20:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0009.png 10 40 -100 -70 2005-08-27 21 1 1 2005-08-27T21:00:00Z 2005-08-28T03:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0010.png 10 40 -100 -70 2005-08-28 04 1 1 2005-08-28T04:00:00Z 2005-08-28T21:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0011.png 10 40 -100 -70 2005-08-28 22 1 1 2005-08-28T22:00:00Z 2005-08-29T02:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0012.png 10 40 -100 -70 2005-08-29 03 1 1 2005-08-29T03:00:00Z 2005-08-29T21:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0013.png 10 40 -100 -70 2005-08-29 22 1 1 2005-08-29T22:00:00Z 2005-08-30T01:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0014.png 10 40 -100 -70 2005-08-30 02 1 1 2005-08-30T02:00:00Z 2005-08-30T21:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0015.png 10 40 -100 -70 2005-08-30 22 1 1 2005-08-30T22:00:00Z 2005-08-31T17:59:59Z http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/trmm_85V_katrina.0016.png 10 40 -100 -70 Background Image 0 0 http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/frames/512x512/background.png 10 40 -100 -70 Legend 1 3 http://svs.gsfc.nasa.gov/vis/a000000/a003200/a003249/tmi_85_bar2.png