In situ observations of water vapor and cirrus IWC in the Pacific TTL during ATTREX Troy Thornberry, Drew Rollins, Ru-Shan Gao, David Fahey Paul Bui, Sarah.

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Presentation transcript:

In situ observations of water vapor and cirrus IWC in the Pacific TTL during ATTREX Troy Thornberry, Drew Rollins, Ru-Shan Gao, David Fahey Paul Bui, Sarah Woods 2014 Western Pacific Airborne Campaigns Science Team Meeting Boulder Colorado, October 21, 2014

ATTREX 2 & 3 Flights Sampling of the TTL over the Pacific with the goal of improving understanding of the dynamical and microphysical processes related to the final dehydration of air entering the stratosphere.

ATTREX 2 & 3 Flights Extensive in situ sampling of the Pacific TTL with measurements of water vapor and cirrus properties. However, some sampling limitations…

Latitude and Longitude

Sampling Histograms Comparison of 2013 and 2014 from GH sampling perspective 2013: > 74 hours in the TTL 2014: > 108 hours in the TTL Limited sampling in either year at temperatures < 186 K

TTL temperature profiles Higher CP tropopause observed in 2013 More consistent T structure above the CPT in 2013 Similar lower T values in both years determined by GH sampling limits

Combined Temperature profile Combined profile looks reasonable During both 2013 and 2014 a number of warm profiles were measured

Temperature vs Theta profile Coldest temperatures sampled between 365 and 380 K potential temperature

Water vapor profiles Typical WV values above CP lower by ~ 05 ppm in 2013 than 2014 Consistent with zonal mean value difference

Combined WV profile Apparent discontinuity above 410K due to difference in profile top between ATTREX-2 and ATTREX-3

In-cloud vs Clear-sky

ATTREX cloud fraction Define cloud using FCDP and NW IWC measures Sampled cloud fractions similar to satellite climatology Particularly high cloud fraction observed at lowest sampled temperatures

Clear-sky RH ice profile Broad range of RH ice observed in clear air from very dry to supersaturated Frequent dry values observed near 360K

In-cloud RH ice profile Distribution of RH ice within cirrus centered near 100% throughout profile Values range from ~50% to above homogeneous freezing threshold

Clear-sky RH ice vs T Koop et al. (Nature 2000) Homogeneous freezing threshold

In-cloud RH vs T

IWC vs T

S TW vs Temperature

Summary GH observations of temperature and water vapor profiles are consistent with the zonal mean differences between 2013 and 2014 Sampled cloud fractions higher than satellite climatology RH ice below homogeneous freezing threshold in clear air Distribution of RH ice in cirrus peaks near 100% but has a broad range and potentially some very high values Significant cirrus IWC measurements along with cirrus properties measurements Distribution of TW (vapor + IWC) includes a number of values significantly exceeding homogeneous freezing threshold

Directions NW and FCDP/Hawkeye IWC closure Investigation of in situ cirrus nucleation mechanisms Dehydration efficiency…

Non-water containing particles in the LS?

END

WV profile

IWC/TW ratio vs T

Hawkeye FCDP vs FCDP