Modeling approach to regional flux inversions at WLEF Modeling approach to regional flux inversions at WLEF Marek Uliasz Department of Atmospheric Science Colorado State University Who needs data? or

CSU RAMS LPD model influence functions for concentration for vertical flux Bayesian inversion modeling framework

influence function for concentration measurements C * concentration sample

surface fluxes influence function for concentration measurements C * concentration sample

surface fluxes initial concentration influence function for concentration measurements C * concentration sample

surface fluxes initial concentration inflow fluxes influence function for concentration measurements C * concentration sample

influence functions for surface fluxes: 1D PBL

WLEF tower – July 1997 influence function for passive tracer

influence functions for inflow fluxes: 1D PBL 30m sample1100m sample

NEE constrains used in inversion calculations: NEE=R+A R=R 0 A=A 0 c veg RAD/(RAD+200) R 0,A 0 – unknown parameters to be estimated RAD, c veg – from RAMS

CWCW 1000 km x z D q samples DDD q0q0

Two-Tower Inversions R is very well estimated A isn’t bad NEE very hard to estimate with unknown inflow Best estimates when towers are spaced optimally w.r.t. travel time (daytime)

Climatology of influence functions for August 2000 influence functions derived from RAMS/LPD model simulations passive tracer different configurations of concentration samples - time series from - a single level of WLEF tower - all levels of WLEF tower - WLEF tower + six 76m towers

Regional inversions reduction of uncertainty in flux estimation pseudo-data generation and ensemble inversion

Configuration of source areas with WLEF tower in the center of polar coordinates Example of estimation of NEE averaged for August 2000 Bayesian inversion technique using influence function derived from CSU RAMS and Lagrangian particle model flux estimation for source areas in polar coordinates within 400 km from WLEF tower (better coverage by atmospheric transport) NEE decomposed into respiration and assimilation fluxes: R=R 0, A=A 0 f(short wave radiation, vegetation class) inversion calculations for increasing number of concentration data (time series from towers) NEE uncertainty presented in terms of standard deviation derived from posteriori covariance matrix inflow CO 2 flux is assumed to be known from a large scale transport model in further work, concentration data from additional tower will be used to improve the inflow flux given by a large scale model

CSU RAMS LPD model influence functions for concentration for vertical flux Bayesian inversion modeling framework

Signature of Lake Superior in WLEF tower CO 2 concentration data  Attempt to validate transport modeling  Example of using influence function to analyze observational data

… following data analysis by Noel R. Urban:  2000 WLEF data: CO 2 concentration  lake and land sectors determined by 396m wind direction  wind speed < season median  daytime only 10:00-17:00 … following data analysis by Noel R. Urban:  2000 WLEF data: CO 2 concentration  lake and land sectors determined by 396m wind direction  wind speed < season median  daytime only 10:00-17:00

Repeating analysis for all available CO 2 data

Repeating data analysis for August 2000

problems:  a lot of missing wind data at 396m (only 62% of wind data available during daytime hours)  sectors poorly represent land or water source areas problems:  a lot of missing wind data at 396m (only 62% of wind data available during daytime hours)  sectors poorly represent land or water source areas

Modeling approach to data analysis:  RAMS simulation: (August 2000, 2 nested grids)  LPD model influence functions Modeling approach to data analysis:  RAMS simulation: (August 2000, 2 nested grids)  LPD model influence functions

Influence function: August 2000, entire domain

Influence function: August 2000, land

Influence function: August 2000, water

Influence function: August 2000, land

what 400m tower sees in “land” and “lake” sectors in August 2000

Applying modeling approach to data analysis for August 2000 Relative contribution from Lake Superior and all land areas

Applying modeling approach to data analysis for August 2000

time series analysis? lake contribution CO 2 concentration

RAMS/LPD simulations for WLEF area

Summer 2000

RAMS/LPD simulations for WLEF area Summer 2000 Summer 2004

RAMS/LPD simulations for WLEF area Pseudo-data inversions using the Ring of Towers (Summer 2000) Pseudo-data inversions using the Ring of Towers (Summer 2000) Summer 2000 Summer 2004

RAMS/LPD simulations for WLEF area Pseudo-data inversions using the Ring of Towers (Summer 2000) Pseudo-data inversions using the Ring of Towers (Summer 2000) Summer 2000 Summer 2004 Real data inversions using the Ring of Towers (Summer 2004) Real data inversions using the Ring of Towers (Summer 2004)

RAMS/LPD simulations for WLEF area Pseudo-data inversions using the Ring of Towers (Summer 2000) Pseudo-data inversions using the Ring of Towers (Summer 2000) Summer 2000 Summer 2004 Real data inversions using the Ring of Towers (Summer 2004) Real data inversions using the Ring of Towers (Summer 2004) Data analysis using influence functions