rennie selkirk, nasa gsfc/gestar mark schoeberl , stc
DESCRIPTION
Variability of TTL water vapor A filtered CFH climatology and MLS water vapor for Ticosonde /Costa Rica . Rennie Selkirk, NASA GSFC/GESTAR Mark Schoeberl , STC. ATTREX Science Team Meeting NCAR – 24 October 2013. Sonde processing. Objectives: - PowerPoint PPT PresentationTRANSCRIPT
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Variability of TTL water vapor
A filtered CFH climatology andMLS water vapor for Ticosonde/Costa
Rica
Rennie Selkirk, NASA GSFC/GESTARMark Schoeberl, STC
ATTREX Science Team MeetingNCAR – 24 October 2013
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Sonde processing
• Objectives: – Highlight the large seasonal variability in TTL WV– Need to remove CFH noise in at scale of ~100 m
• Approach:– Low-pass filter – with attention to data gaps– Apply to all variables– Calculate seasonal climo on data from 2005-2011– Will soon add 2012 and 2013
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Temperatures at Costa Rica
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CFH Water Vaporwith previous season
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RH ice
Both seasons show rapid fall off of mean RHice profile at mean coldpoint (dashed lines)
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WV tape recorder at Costa Rica(seasonal time averages)
Season Min T (“coldpoint tropopause
”)
WV at Tmin
1st WV tape recorder min
(“hygropause”)
1st WV tape recorder max
Upper WV tape
recorder min
DJF -82.6° C (17.4 km)
2.7 ppmv 2.5 ppmv (17.9 km)
4.4 ppmv (20.5 km)
3.4 ppmv (23 km)
MAM -81.3° C (17.2 km)
3.3 ppmv 2.9 ppmv (17.4 km)
4.5 ppmv (22 km)
n/a
JJA -76.7° C (16.1 km)
6.5 ppmv 3.5 ppmv (19.7 km)
4.9 ppmv (24.1 km)
n/a
SON -79.3° C (16.7 km)
4.2 ppmv 4.2 ppmv (16.8 km)
5.3 ppmv (17.8 km)
3.5 ppmv (21.6 km)
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Water Vapor vs Ozone
DJF JJA
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MLS water vapor intecomparisons
• Long-term average data – MLS WV, version 3, interpolated via MERRA to San Jose
and in potential temperature– Can be used to compare to CFH seasonal climatology
• MLS RDFs:– Back-trajectory-based product– Synthetic high-vertical resolution water vapor (and
ozone) profiles– Use to infer day-to-day variability at a sounding
location
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Sondes vs. MLS v.3
Winter composite
(36 sondes)
Summer composite
(60 sondes)
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MLS RDF @ SJOSummer 2007
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MLS RDFs vs CFH
****
* *
*MLS RDF
profile(previous
slide)
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Summary
• Strong seasonal cycle of water vapor in UTLS at Costa Rica Low-pass filtering of CFH data– Tape recorder prominent
• Low-pass filtering reduces instrumental noise– But may reduce frequency of high RH in TTL too strongly
• Seasonal average fields consistent with MLS, v.3• MLS RDFs promising technique for reproducing
vertical structure seen in sondes