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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 of Colorado MMS, FCDP, and CPL teams ATTREX Science Team Meeting • 24 October 2013. ATTREX Flights . Average flight: 7790 nm

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water in the pacific ttl during attrex 2013

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

slide2

ATTREX Flights

Average flight:

7790 nm

14300 km

24.4 hrs

slide3

ATTREX Flights

TTL Profiles ±15° Latitude

temperature and wv structure of the ttl
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
saturation potential temperature
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%
rh ice climatology
RHice climatology

From Krämer et al., ACP, 2009

Data from FISH + FLASH/OJSTER, 9 missions, 1999-2006

where does the attrex data fall
Where does the ATTREX data fall?

From Krämer et al., ACP, 2009

Data from FISH + FLASH/OJSTER, 9 missions, 1999-2006

  • Within the envelope of previous measurements
  • Temperatures reached not as cold as FISH has seen
slide9

ATTREX RF05

26-27 February

slide11

High water content cloud

7 – 15°N 26-27 February 2013

FCDP Data, SPEC Inc., P. Lawson PI

slide12

Contrasting cirrus clouds

7 – 15°N 26-27 February 2013

dehydration by sedimentation
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?
can we use trajectories to inform the data
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
can we use trajectories to inform the data1
Can we use trajectories to inform the data?
  • Add calculated saturation H2O MR to look at potential dehydration history
summary
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…