I am currently a Ph.D. candidate at the University of Houston majoring in Atmospheric Sciences. However, my career journey does not start from the atmosphere, yet the solid Earth. I am holding a bachelor's and master's degree in Geology from China, where I built a firm foundation in mathematics and natural sciences. Inspired by the more and more frequent extreme events around the world and their disastrous effects on human life, I decided to change my career path to atmospheric sciences aiming to help mitigate the adverse impact of climate change. Participating in multiple practical projects, I have developed considerable expertise in air quality data analysis, environmental modeling, and professional writing. More knowledge as I acquire from the atmospheric research field, more curious I become about the mysterious and elusive world we are living in. But I am ready to dive in......
Wei Li
University of Houston
Science & Research Building 1
3507 Cullen Blvd, Room 413
Houston, Texas 77204-5007
wli31@central.uh.edu
PhD in Atmospheric Sciences • August 2018 - present
M.S. Degree in Geology • August 2015 - June 2018
B.S. Degree in Resources Exploration Engineering • August 2011 - June 2015
Teacher and Data Analyzer • August 2018 - Present
As a teacher, I taught climate change labs and basic R programming. As a researcher, I used air quality observations from field campaigns in San Antonio and Houston to evaluate chemical transport models (e.g., GEOS-Chem). Supported by a NOAA AC4 funding, we are using data from long-term observational networks (e.g., AQS, CSN, IMPROVE) over the US to derive process-level metrics of how different atmospheric compositions change under droughts, and then use the metrics to evaluate the performance of coupled chemistry-climate models (e.g., CMIP6 models) regarding their capability of capturing the drought-air quality relationships.
Field Worker • August 2015 - June 2018
I traveled around different provinces in China to observe rock types and tracked strata containing coal seams in the field. In the lab, I also observed sandstone's thin sections and coal polished sections using a microscope.
I use R and Python on a daily basis on a Linux system for my data analysis research work. I have experience running GEOs-Chem full-chemistry, passive tracer, and HEMCO standalone simulations. I also modified the source codes of GEOS-Chem to applied our satellite-based drought stress factor on isoprene emissions. WRF-CAMx and SMOKE are new skills I developed for a modeling project funded by TCEQ. Recently, I found Google Earth Engine is a very useful tool for map visualizations and want to pick it up.
Using recirculation factor (R=L/S) as one of the seven features for K-Means clustering, we can automatically separate sea breeze recirculation from other synoptic patterns. This method is also applicable to other coastal regions.
Ozone, MeteorologyThe GEOS-Chem passive tracer simulation is a useful tool to analyze long-range transport. Air mass from any source region of interest can be tagged when transported with meteorology. This is an example of smoke from California moving to El Paso in August 2020 causing bad air quality.
Transport, ModellingWe conducted a GEOS-Chem full-chemistry simulation to compare with the observational data collected during the San Antonio field study in 2017. It is surprised to find ozone vertical distribution is well captured by the model.
Chemistry ModellingWRF-CAMx is a regional scale model allowing us to investigate the regional air quality in a finer spatial resolution. TRACER-AQ and Galveston Offshore Ozone (GO3) campaigns provide both inland and offshore ozone measurements for us to evaluate how good WRF-CAMx with 1km emission inventory can reproduce the onshore-offshore ozone distributions.
Regional-scale ModellingUsing weekly US drought monitor (USDM) maps and long-term observations of ozone and its precursors in the US, we reveal the spatial disparity of ozone response to drought with higher enhancement in the eastern US than in the west. This disparity is caused by the opposite response of biogenic isoprene to drought. This research highlights the key role of biogenic isoprene on ozone chemistry under drought conditions.
Drought, Ozone ChemistryOrganic carbon (OC; from IMPROVE measurements) shows the highest enhancement over the Pacific Northwest region in the US. This can be associated with wildfire emission changes under droughts, which nearly doubles the OC changes under drought with no wildfire occurrence. The CMIP6 models seem to capture this relationship. OC changes in the southeastern US appear to be related to the sulfate-catalyzed isoprene chemistry.
Drought, Organic CarbonUsing long-term surface fine dust observations, weekly US Drought Monitor (USDM), and monthly Standardized Precipitation-Evapotranspiration Index (SPEI), we unmask the spatial disparity in drought-dust relationships where the SEUS stands out as being abnormous in that it shows a decrease in surface dust concentrations during drought in contrast to the expected increase in dust found in other contiguous US regions. This study reveals the mechanism of how regional-scale droughts influence aerosol abundance through changing long-range transport of dust via teleconnections with North Atlantic Oscillation (NAO).
Drought, Dust TransportGoogle Earth Engine is a useful tool to overlap tons of satellite images onto a street map, which allows us to check the air quality on a street or community level taking advantage of the newly launched satellites with high spatial-temporal resolutions (e.g., TropOMI, Sentinel-5P). Above is an example of the Sentinel-5P HCHO columns over Atlanta in summer 2019. Stay tuned for more to come...
Satellite, Visualization
Li, W., Wang, Y., Bernier, C., & Estes, M. (2020). Identification of sea breeze recirculation and its effects on ozone in Houston, TX, during DISCOVER‐AQ 2013. Journal of Geophysical Research: Atmospheres, 125(22), e2020JD033165.
Li, W., Wang, Y., Flynn, J., Griffin, R. J., Guo, F., & Schnell, J. L. (2021). Spatial variation of surface O3 responses to drought over the contiguous United States during summertime: role of precursor emissions and ozone chemistry. Journal of Geophysical Research: Atmospheres, e2021JD035607.
Li, W., & Wang, Y. (2022). Reduced surface fine dust under droughts over the southeastern United States during summertime: observations and CMIP6 model simulations. Atmos. Chem. Phys., 22, 7843–7859.
Feel free to reach out if you have any questions or want to collaborate! I am willing to work with motivated scientists and happy to expand my research to other interesting topics.