Water in the Pacific TTL during ATTREX 2013 Troy Thornberry 1,2, Drew Rollins 1,2, Ru-Shan Gao 1,...
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Transcript of Water in the Pacific TTL during ATTREX 2013 Troy Thornberry 1,2, Drew Rollins 1,2, Ru-Shan Gao 1,...
![Page 1: Water in the Pacific TTL during ATTREX 2013 Troy Thornberry 1,2, Drew Rollins 1,2, Ru-Shan Gao 1, David Fahey 1,2 1 NOAA ESRL CSD and 2 CIRES, University.](https://reader033.fdocuments.net/reader033/viewer/2022051620/56649eb15503460f94bb7874/html5/thumbnails/1.jpg)
Water in the Pacific TTL during ATTREX 2013
Troy Thornberry1,2, Drew Rollins1,2, Ru-Shan Gao1, David Fahey1,2
1NOAA ESRL CSD and 2CIRES, University of Colorado
MMS, FCDP, and CPL teams
ATTREX Science Team Meeting • 24 October 2013
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Average flight: 7790 nm 14300 km 24.4 hrs
ATTREX Flights
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ATTREX Flights
TTL Profiles ±15° Latitude
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Temperature and WV Structure of the TTL
CP Tropopause altitudes between 17 and 18 km on individual profiles
H2O MR < 5 ppm above 16.5 km and as low as 1.5 ppm
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Saturation Potential Temperature
Saturated mixing ratios not observed above ~380 K potential temperature surface
Altitude of the 380 K surface typically ~17.5 km (87 hPa)
Cirrus clouds observed with both large supersaturations and subsaturations, although mean values close to 100%
![Page 6: Water in the Pacific TTL during ATTREX 2013 Troy Thornberry 1,2, Drew Rollins 1,2, Ru-Shan Gao 1, David Fahey 1,2 1 NOAA ESRL CSD and 2 CIRES, University.](https://reader033.fdocuments.net/reader033/viewer/2022051620/56649eb15503460f94bb7874/html5/thumbnails/6.jpg)
RHi and Clouds
![Page 7: Water in the Pacific TTL during ATTREX 2013 Troy Thornberry 1,2, Drew Rollins 1,2, Ru-Shan Gao 1, David Fahey 1,2 1 NOAA ESRL CSD and 2 CIRES, University.](https://reader033.fdocuments.net/reader033/viewer/2022051620/56649eb15503460f94bb7874/html5/thumbnails/7.jpg)
RHice climatology
From Krämer et al., ACP, 2009Data from FISH + FLASH/OJSTER, 9 missions, 1999-2006
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Where does the ATTREX data fall?
From Krämer et al., ACP, 2009Data from FISH + FLASH/OJSTER, 9 missions, 1999-2006
• Within the envelope of previous measurements
• Temperatures reached not as cold as FISH has seen
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ATTREX RF05
26-27 February
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Cloud Physics Lidar
Longitude
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High water content cloud 7 – 15°N 26-27 February 2013
FCDP Data, SPEC Inc., P. Lawson PI
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Contrasting cirrus clouds 7 – 15°N 26-27 February 2013
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Dehydration by sedimentation
• The larger diameter particles will fall much faster, leading to faster downward transport of water
• Both types of cloud particles fall much faster than typical ascent rates so should provide dehydration- Effect of observed supersaturations?
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Can we use trajectories to inform the data?
• In situ data provides a snapshot in time
• Tracer species can provide information on air parcel history
• Possible to get direct dynamic information?
• Trajectories from Tao Wang, Texas A&M
• ERA interim reanalysis• isentropic coordinate
model with diabatic heating vertical transport
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Can we use trajectories to inform the data?
Add calculated saturation H2O MR to look at potential dehydration history
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Summary
Dehydration was likely occurring just below 380 K (~ 17.5 km) in the central and eastern Pacific boreal winter
TTL cirrus clouds varied significantly in ice crystal number and size and in supersaturation, yielding a wide range of dehydration potentials
ATTREX RHice observations fit within the envelope from previous studies (Krämer et al, 2009)
Trajectories provide a possibility to investigate the air parcel history and provide context to the snapshot of in situ measurements Tantalizing, but fraught…