CO2 transport, variability, and budget over the Southern California Air Basin using the high-resolution WRF-VPRM model during the CalNex 2010 campaign

Changhyoun Park, Christoph Gerbig, Sally Newman, Ravan Ahmadov, Sha Feng, Kevin Gurney, Gregory R. Carmichael, Soon Young Park, Hwa Woon Lee, Mike Goulden, Jochen Stutz, Jeff Peischl, Tom Ryerson

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

To study regional-scale carbon dioxide (CO2) transport, temporal variability, and budget over the Southern California Air Basin (SoCAB) during the California Research at the Nexus of Air Quality and Climate Change (CalNex) 2010 campaign period, a model that couples the Weather Research and Forecasting (WRF) Model with the Vegetation Photosynthesis and Respiration Model (VPRM) has been used. Our numerical simulations use anthropogenic CO2 emissions of the Hestia Project 2010 fossil-fuel CO2 emissions data products along with optimized VPRM parameters at "FLUXNET" sites, for biospheric CO2 fluxes over SoCAB. The simulated meteorological conditions have been validated with ground and aircraft observations, as well as with background CO2 concentrations from the coastal Palos Verdes site. The model captures the temporal pattern of CO2 concentrations at the ground site at the California Institute of Technology in Pasadena, but it overestimates the magnitude in early daytime. Analysis of CO2 by wind directions reveals the overestimate is due to advection from the south and southwest, where downtown Los Angeles is located. The model also captures the vertical profile of CO2 concentrations along with the flight tracks. The optimized VPRM parameters have significantly improved simulated net ecosystem exchange at each vegetation-class site and thus the regional CO2 budget. The total biospheric contribution ranges approximately from -24% to -20% (daytime) of the total anthropogenic CO2 emissions during the study period.

Original languageEnglish (US)
Pages (from-to)1337-1352
Number of pages16
JournalJournal of Applied Meteorology and Climatology
Volume57
Issue number6
DOIs
StatePublished - Jun 1 2018

Keywords

  • Air quality
  • Biosphere-atmosphere interaction
  • Greenhouse gases
  • Regional effects

ASJC Scopus subject areas

  • Atmospheric Science

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    Park, C., Gerbig, C., Newman, S., Ahmadov, R., Feng, S., Gurney, K., Carmichael, G. R., Park, S. Y., Lee, H. W., Goulden, M., Stutz, J., Peischl, J., & Ryerson, T. (2018). CO2 transport, variability, and budget over the Southern California Air Basin using the high-resolution WRF-VPRM model during the CalNex 2010 campaign. Journal of Applied Meteorology and Climatology, 57(6), 1337-1352. https://doi.org/10.1175/JAMC-D-17-0358.1