1 Cloud microphysical properties in cirrus during ATTREX Sarah Woods 1, Sara Lance 1, Eric Jensen 2, Nick Krause 1, R. Paul Lawson 1, Bruce Gandrud 1,

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Presentation transcript:

1 Cloud microphysical properties in cirrus during ATTREX Sarah Woods 1, Sara Lance 1, Eric Jensen 2, Nick Krause 1, R. Paul Lawson 1, Bruce Gandrud 1, Troy Thornberry 3, Andrew W. Rollins 3, Paul Bui 2 1 SPEC Incorporated, Boulder, CO 2 NASA Ames Research Center, Moffet Field, CA 3 NOAA ESRL Chemical Sciences Division, Boulder, CO

2 InstrumentResolution Measurement Range Measurement Technique Hawkeye-CPI (cloud particle imager) 2.3 um2.3 um mmCCD (camera) Hawkeye-FCDP2 um1 um - 50 umForward Scattering Hawkeye-2D-S10 um10 um mm Diode Array (128)

Habit Classification Feb 16, Spheroids Columns Budding Rosettes Habit classification following Lawson et al. (2006) 200 um

Habit Occurrence Feb 16, “spheroid” 200 um

Size Distributions 5 If using FCDP, take a look at 2D-S as well Reliable FCDP measurements require higher bin counts per second

March

7

8 Region 1 R1

March Region 1R1

March Region 1 Region 2 R2

R1 March Region 2 R2

March

R1 March Region 1 Region 2 Region 3 R3 R2

March Region 3 R3 R2 R1

March

Summary High resolution images of cirrus particles allow for habit classification Predominantly spheroid Small irregulars Small percentage of columns, plates, rosettes, bullet rosettes Continued investigation of habit classification as a function of RHice and temperature for varying cirrus types Good correlation between particle probes and NOAA water vapor observations Evidence of homogeneous nucleation For questions on Hawkeye or FCDP data please contact us 16

Size Distributions 17 If using FCDP, take a look at 2D-S as well Reliable FCDP measurements require higher bin counts per second

18

SSice vs Temperature Feb 16 19