Research

Feb 20, 2024

I am a PhD candidate at the Atmospheric Chemistry Modeling Group, Harvard University.

Please feel free to reach out to me to talk about all kinds of research at hplin at seas.harvard.edu.

Are you reporting a GEOS-Chem or HEMCO bug? Please post them at the GEOS-Chem or HEMCO issue trackers.

Research Topics

My work is focused on the development and evaluation of meteorology-chemistry and chemistry-climate models. Availability of more powerful compute resources has made on-line atmospheric chemistry modeling accessible. Atmospheric chemists can take advantage of on-line meteorology for forecasting and explore interactions and feedback between meteorology and chemistry. Climate scientists can use on-line chemistry to investigate effects of chemistry on climate and future air quality scenarios.

WRF-GC two-way meteorology-chemistry model

WRF-GC v1.0 structure

I led the technical development of the WRF-GC model coupling the Weather Research and Forecasting Model (WRF) with the GEOS-Chem atmospheric chemistry model. The WRF-GC model is now maintained at the Atmospheric Chemistry and Climate Group at SUSTech. Read the new WRF-GC documentation!

Original model references: Lin et al., 2020 GMD; Feng et al., 2021 GMD Applications: Zhang et al., 2020 Atmosphere; Xu et al., 2022 GMD; Feng et al., 2023 EST

Kinetic Pre-Processor (KPP) and adaptive chemical solvers

Adaptive solver in GEOS-Chem

I co-led the development of an adaptive chemical solver for the Kinetic Pre-Processor (KPP) version 3.0.0, aiming to speed up the computation of chemistry within models while maintaining acceptable accuracy.

I also assisted in developing machine learning-based chemistry solvers within the GEOS-Chem model in collaboration with Makoto Kelp, et al. through the development of an interface between Python-based machine learning code and the Fortran-based GEOS-Chem model.

Publications: Lin et al., 2023 JAMES; Kelp et al., 2022 JAMES

HEMCO 3.0 emissions component and CESM2 with the GEOS-Chem chemical module

HEMCO 3.0 structure

I assisted in the development of the GEOS-Chem chemical module within the Community Earth System Model (CESM2), providing users with an alternative chemical option to CAM-chem. My major contribution was the development of the Harmonized Emissions Component (HEMCO) Version 3 to provide harmonized emissions between CAM-chem, GEOS-Chem within CESM, WRF-GC, and the GEOS-Chem model. Learn about HEMCO within CESM (CAM-chem/MUSICA and GEOS-Chem within CESM) at the CAM-chem/MUSICA wiki!

Publications: Lin et al., 2021 GMD; Fritz et al., 2022 GMD

High-Performance Computing

I work on porting the GEOS-Chem model and other atmospheric chemistry models such as WRF-GC to the cloud, scaling up to thousands of cores and generating terabytes of data per day. I am always excited about writing high-performance, scalable code to do better science.

Publications: Zhuang et al., 2020 JAMES

Peer-reviewed Publications

13 peer reviewed publications, 3 first-authored. H-index: 7. My Google Scholar, ORCiD, Web of Science ResearcherID.

13. Sun, R., Lu, X., Gao, M., Du, Y., Lin, H., Wright, C., He, C., and Yin, K.: The Impacts of Shipping Emissions on Lightning: Roles of Aerosol-radiation-interactions and Aerosol-cloud-interactions, Environmental Research Letters, 2024. PDF

12. Chen, Z., Balasus, N., Lin, H., Nesser, H., and Jacob, D. J.: African rice cultivation linked to growing methane, Nature Climate Change, 2024. PDF (group website) [Nature Research Highlight]

11. Feng, X., Ma, Y., Lin, H., Fu, T.-M., Zhang, Y., Wang, X., Zhang, A., Yuan, Y., Han, Z., Mao, J., Wang, D., Zhu, L., Wu, Y., Li, Y., and Yang, X.: Impacts of Ship Emissions on Air Quality in Southern China: Opportunistic Insights from the Abrupt Emission Changes in Early 2020, Environmental Science and Technology, 2023. PDF

10. Yang, L. H., Jacob, D. J., Colombi, N. K., Zhai, S., Bates, K. H., Shah, V., Beaudry, E., Yantosca, R. M., Lin, H., Brewer, J. F., Chong, H., Travis, K. R., Crawford, J. H., Lamsal, L., Koo, J.-H., and Kim, J.: Tropospheric NO2 vertical profiles over South Korea and their relation to oxidant chemistry: Implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space, Atmospheric Chemistry and Physics, 2023. PDF

9. Lin, H., Long, M. S., Sander, R., Yantosca, R. M., Estrada, L. A., Shen, L., and Jacob, D. J.: An adaptive auto-reduction solver for speeding up integration of chemical kinetics in atmospheric chemistry models: implementation and evaluation in the Kinetic Pre-Processor (KPP) version 3.0.0, Journal of Advances in Modeling Earth Systems, 2023. ePDF

8. Fritz, T. M., Eastham, S. D., Emmons, L. K., Lin, H., Lundgren, E. W., Goldhaber, S., Barrett, S. R. H., and Jacob, D. J.: Implementation and evaluation of the GEOS-Chem chemistry module version 13.1.2 within the Community Earth System Model v2.1, Geoscientific Model Development, 2022. PDF

7. Kelp, M. M., Jacob, D. J., Lin, H., and Sulprizio, M. P.: An Online-Learned Neural Network Chemical Solver for Stable Long-Term Global Simulations of Atmospheric Chemistry, Journal of Advances in Modeling Earth Systems, 2022. ePDF

6. Xu, X., Feng, X., Lin, H., Zhang, P., Huang, S., Song, Z., Peng, Y., Fu, T.-M., and Zhang, Y.: Modelling the High Mercury Wet deposition in the Southeastern US by WRF-GC, Geoscientific Model Development, 2022. PDF

5. Lin, H., Jacob, D. J., Lundgren, E. W., Sulprizio, M. P., Keller, C. A., Fritz, T. M., Eastham, S. D., Emmons, L. K., Campbell, P. C., Baker, B., Saylor, R. D., and Montuoro, R.: Harmonized Emissions Component (HEMCO) 3.0 as a versatile emissions component for atmospheric models: application in the GEOS-Chem, NASA GEOS, WRF-GC, CESM2, NOAA GEFS-Aerosol, and NOAA UFS models, Geoscientific Model Development, 2021. PDF

4. Feng, X., Lin, H., Fu, T-M., Sulprizio, M. P., Zhuang, J., Jacob, D. J., Tian, H., Ma, Y., Zhang, L., Wang, X. and Chen, Q.: WRF-GC (v2.0): online two-way coupling of WRF (v3.9.1.1) and GEOS-Chem (v12.7.2) for modeling regional atmospheric chemistry-meteorology interactions, Geoscientific Model Development, 2021. PDF

3. Zhang, R., Zhang, Y., Lin, H., Feng, X., Fu, T-M. and Wang, Y.: NOx emission reduction and recovery during COVID-19 in East China, Atmosphere, 2020. PDF [ESI top 1% highly cited paper as of November/December 2021]

2. Lin, H., Feng, X., Fu, T-M., Tian, H., Ma, Y., Zhang, L., Jacob, D. J., Yantosca, R. M., Sulprizio, M. P., Lundgren, E. W., Zhuang, J., Zhang, Q., Lu, X., Zhang, L., Shen, L., Guo, J., Eastham, S. D. and Keller, C. A.: WRF-GC (v1.0): online coupling of WRF (v3.9.1.1) and GEOS-Chem (v12.2.1) for regional atmospheric chemistry modeling, Part 1: description of the one-way model (v1.0), Geoscientific Model Development, 2020. PDF

1. Zhuang, J., Jacob, D.J., Lin, H., Lundgren, E.W., Yantosca, R.M., Flo Gaya, J., Sulprizio, M.P. and Eastham, S.D., Efficient high-performance computing on the Amazon Web Services cloud with over a thousand cores: application to global atmospheric chemistry simulations at 50-km resolution with GEOS-Chem 12.3.2, Journal of Advances in Modeling Earth Systems, 2020. ePDF

In review

6. Lin, H., Emmons, L. K., Lundgren, E. W., Yang, L. H., Feng, X., Dang, R., Zhai, S., Tang, Y., Kelp, M. M., Colombi, N. K., Eastham, S. D., Fritz, T. M., and Jacob, D. J.: Intercomparison of GEOS-Chem and CAM-chem tropospheric oxidant chemistry within the Community Earth System Model version 2 (CESM2), submitted, 2024.

5. Zhai, S., Jacob, D. J., Franco, B., Clarisse, L., Coheur, P., Shah, V., Bates, K. H., Lin, H., Dang, R., Sulprizio, M. P., Huey, L. G., Moore, F. L., Jaffe, D. A., and Liao, H.: Transpacific transport of Asian peroxyacetyl nitrate (PAN) observed from satellite and implications for transpacific ozone pollution, submitted, 2024.

4. Yang, L. H., Jacob, D. J., Dang, R., Oak, Y., Lin, H., Kim, J., Zhai, S., Colombi, N., Pendergrass, D., Beaudry, E., Shah, V., Feng, X., Yantosca, R. M., Chong, H., Park, J., Lee, H., Lee, W-J., Kim, S., Kim, E., Travis, K. R., Crawford, J. H., and Liao, H.: Interpreting GEMS geostationary satellite observations of the diurnal variation of nitrogen dioxide (NO2) over East Asia., in review, 2023. Preprint (EGUsphere)

3. Gao, Y., Kou, W., Cheng, W., Guo, X., Qu, B., Wu, Y., Zhang, S., Liao, H., Chen, D., Leung, L. R.., Wild, O., Zhang, J., Lin, G., Su, H., Cheng, Y., Poschl, U., Pozzer, A., Zhang, L., Lamarque, J-F., Guenther, A. B., Brasseur, G., Liu, Z., Lu, H., Li, C., Zhao, B., Wang, S., Huang, X., Pan, J., Liu, G., Liu, X., Lin, H., Zhao, Y., Zhao, C., Meng, J., Yao, X., Gao, H., and Wu, L.: Reducing long-standing ozone overestimation with a high-resolution Earth system model, submitted, 2023.

2. Wu, W., Fu, T-M., Arnold, S., Spracklen, D. V., Zhang, A., Tao, W., Wang, X., Hou, Y., Mo, J., Chen, J. K., Li, Y., Feng, X., Lin, H., Huang, Z., Zheng, J., Shen, H., Zhu, L., Wang, C., Ye, J., and Yang, X.: Temperature-dependent evaporative anthropogenic VOC emissions significantly exacerbate regional ozone pollution, submitted, 2023.

1. He, C., Lu, X., Zhang, Y., Liu, Z., Jiang, F., Sun, Y., Gao, M., Liu, Y., Lin, H., Yang, J., Lin, X., Wang, Y., Hu, C., and Fan, S.: Revisiting the quantification of power plant CO2 emissions in the United States and China from satellite: a comparative study using three top-down approaches, in review, 2023.

Invited Talks

An adaptive auto-reduction solver for speeding up integration of chemical kinetics in atmospheric chemistry models: implementation and evaluation within the Kinetic Pre-Processor (KPP) version 3.0.0
Atmospheric Chemical Mechanisms Conference, at University of California, Davis. Davis, CA, USA, December 2022.

Professional Service

Conference Presentations

Note: Sometimes publisher / conference websites delete old copies of presentations leading to broken links. If you’re looking for a particular presentation, please feel free to reach out!

Global Intercomparison of Tropospheric Oxidant Chemistry in a Common Earth System Model Environment using GEOS-Chem (v14.1.1) and CAM-chem Chemistry within the Community Earth System Model version 2 (CESM2)
CESM Atmosphere / Whole Atmosphere / Chemistry-Climate Winter Working Group Meeting, February 2024.

5A.3 Global Intercomparison of Tropospheric Oxidant Chemistry in a Common Earth System Model Environment using GEOS-Chem (v14.1.1) and CAM-chem Chemistry within the Community Earth System Model version 2 (CESM2)
104th American Meteorological Society Annual Meeting, Baltimore, MD, USA, January 2024.

The Harmonized Emissions Component (HEMCO) 3.0 as a versatile multi-model emissions component implemented within MUSICA/CAM-chem
CESM Atmosphere / Whole Atmosphere / Chemistry-Climate Winter Working Group Meeting, January 2023.
View Presentation (CESM Website)

A25H-1830 An adaptive auto-reduction solver for speeding up integration of chemical kinetics in atmospheric chemistry models: implementation and evaluation within the Kinetic Pre-Processor (KPP) version 3.0.0 (poster)
American Geosciences Union (AGU) Fall Meeting 2022, Chicago, IL, USA, December 2022.

An auto-reduction solver to speed up chemical kinetics calculations within GEOS-Chem
10th International GEOS-Chem Meeting (IGC10), at Washington University in St. Louis, MO, USA, June 2022.
View Presentation (IGC10 Website)

WRF-GC: Model Clinic (co-led with Xu Feng)
10th International GEOS-Chem Meeting (IGC10), Washington University in St. Louis, at St. Louis, MO, USA, June 2022.
View Presentation (IGC10 Website), WRF-GC documentation

Development of the Harmonized Emissions Component (HEMCO) as an online emissions component for CAM-chem and CESM-GC
2021 CESM Atmosphere, Whole Atmosphere, & Chemistry Climate Working Group Meeting, February 2021.

12.3 - WRF-GC: Online Coupling of WRF and GEOS-Chem for Urban/Regional Atmospheric Chemistry Modeling
Session 12 Joint with the 23rd Conference on Atmospheric Chemistry Regional Air Quality. Part II: Impacts of Energy and Agriculture, 101st American Meteorological Society Annual Meeting, Online, January 2021.
View Presentation

A022-04 Development of the Harmonized Emissions Component (HEMCO) 3.0 as a general emissions component for atmospheric models (eLightning)
AGU Fall Meeting 2020, Online, December 2020.
View Poster (requires AGU login)

WRF-GC: Running WRF with the GEOS-Chem chemical module: Model Clinic (co-led with Xu Feng)
9th International GEOS-Chem Meeting (IGC9), Harvard University, Cambridge, MA, USA, May 2019.

Development of a Meteorology-Chemistry Coupled Model: WRF-GC, Preliminary Results (poster)
American Geosciences Union/Chinese Academy of Sciences Joint Meeting (AJM JING Meeting), Xi’an, China, October 2018.

Coupling GEOS-Chem with WRF: Developing a new Meteorology-Chemistry Coupled Model, Preliminary Results (poster)
1st GEOS-Chem Asia Meeting (GCA1), NUIST, Nanjing, China, May 2018.