Qingyu Wang - December 2

Weather and Climate Systems Seminar

Local Greenhouse Gases (GHGs) mixing evaluation with single-column WRF-VPRM

Qingyu Wang

Wednesday, December 2^nd

3:00 pm

Join Google Meet:

https://meet.google.com/ssf-prpz-fqa

Previous studies reveal column-averaged carbon dioxide (XCO2) simulations from the Vegetation Photosynthesis and Respiration Model (VPRM) coupled with WRF have regional mismatches compared to OCO-2 measurements in the contiguous US (CONUS). These findings have led to examination of the VPRM flux parameterization over various land surface types, such as shrubland in the southwest US. Our comparisons between CO2 tall-tower observations and 3-D WRF-VPRM simulations show consistent underestimations at night and better estimates in the daytime across most land surface types, which may be due to errors in biogenic or anthropogenic emissions or due to model transport, such as vertical mixing related to planetary boundary layer (PBL) dynamics. In order to understand the simulated-measured GHG mismatches, we use an ideal single-column WRF-VPRM to distinguish between transport and surface fluxes as drivers. The single-column WRF-VPRM simulations on multiple time scales and altitudes are analyzed with observations from AmeriFlux, weather balloons, and aircraft are used to tease apart these separate influences, and these findings can be applied to the regional scale simulations with WRF-VPRM to improve simulated atmospheric CO2.