Model evolution of a START08 observed tropospheric intrusion Dalon Stone, Kenneth Bowman, Cameron Homeyer - Texas A&M Laura Pan, Simone Tilmes, Doug Kinnison.

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Presentation transcript:

Model evolution of a START08 observed tropospheric intrusion Dalon Stone, Kenneth Bowman, Cameron Homeyer - Texas A&M Laura Pan, Simone Tilmes, Doug Kinnison - NCAR Elliot Atlas - U. of Miami START08 Project Team UTLS Workshop, NCAR

START08 Field Campaign Stratosphere-Troposphere Analyses of Regional Transport (START08) April - June 2008, 18 flights NSF/NCAR Gulfstream V (GV) Aircraft Measured numerous chemical and microphysical species in the extratropical upper troposphere and lower stratosphere (UTLS)

Models Used - Whole Atmosphere Community Climate Model (WACCM) - Global Forecast System (GFS) NCAR climate model with numerous chemical species and free running dynamics 2.5° x ~1.9° horizontal resolution, interpolated to GFS pressure grid with 47 vertical levels, ~1 km native resolution in the UTLS 3 hour output from April to July 2008 Particular simulation used 10% nudging to meteorological fields from Goddard Earth Observing System (GEOS-5) analyses National Centers for Environmental Prediction (NCEP) global model used for synoptic-scale weather forecasts 0.3° x 0.3° high horizontal resolution, 47 vertical levels with ~0.5 km resolution in the UTLS 6 hour analyses from April to July 2008 ss

Primary Goals To compare WACCM model output to in situ START08 observations with tracer correlations and vertical profiles Compare WACCM with GFS analyses to verify existence of dynamical transport features and multiple tropopause (MT) events within the met fields Use START08 data and GFS analyses to validate WACCM’s ability to simulate intrusion-like characteristics Use WACCM as a diagnostic tool to study the spatial and temporal evolution of a mid-latitude tropospheric intrusion

RF01 flight summary

RF01 Flight Track

RF01 Static Stability Low stabilityHigh stability Sandwich layer

Tracer comparisons with RF01 observations

RF01 Tracer Comparison Flight through intrusion Lifetime: ~ months Sandwich layer

RF01 Tracer Comparison Lifetime: ~ 3 months Sandwich layer

RF01 Tracer Comparison Intrusion points

Flight RF01 Intrusion branch

RF01 Tracer Comparison

Spatial and vertical extent of intrusion

WACCM Ozone vs. CO Tropospheric intrusion Stratospheric intrusion Criterion... a). < 390 K b). > 25˚ N.

GFS Double Tropopause

WACCM Double Tropopause

WACCM Stability Section

WACCM Ozone Section

WACCM Stability Section

WACCM Ozone Section

Intrusion in 3-D Core of intrusion layer WACCM tropopause Low observed ozone

Model evolution of RF01 tropospheric intrusion

WACCM 380 K Ozone

WACCM Min Critical Ozone Ozone (ppbv) Altitude (km) Typical Ozone Profile in Intrusion Layer < 4 km 17 km > 20% decrease Plotted value (core of intrusion) Tropopause

Summary and Future Work WACCM nudged met fields capture synoptic-scale dynamical processes (e.g., wave breaking) that are associated with tropospheric intrusions and MT events Mixing and/or diffusion time scales within the intrusion appear to be shorter than START08 observations suggest START08 observations provide a high-resolution data set to further validate WACCM output Model ozone lapse rates are used to identify the spatial extent of tropospheric intrusions Mapping these regions will provide a tool to study the spatial and temporal evolution of tropospheric intrusions in the future