Title: Look Up: Probing the Vertical Profile of New Particle Formation and Growth in the Planetary Boundary Layer With Models and Observations

Journal Article · · Journal of Geophysical Research: Atmospheres
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6];  [5]; ORCiD logo [5]; ORCiD logo [7]; ORCiD logo [8];  [9]; ORCiD logo [10]; ORCiD logo [1]
  1. Department of Atmospheric Science Colorado State University Fort Collins CO USA
  2. Ramboll USA, Inc. Arlington VA USA
  3. State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing China
  4. Handix Scientific Fort Collins CO USA
  5. Pacific Northwest National Laboratory Richland WA USA
  6. Brookhaven National Laboratory Upton NY USA
  7. Department of Atmospheric Science University of Washington Seattle WA USA, Department of Applied Physics University of Eastern Finland Kuopio Finland
  8. Department of Atmospheric Science University of Washington Seattle WA USA
  9. Department of Chemistry University of California Irvine Irvine CA USA
  10. Department of Mechanical Engineering Colorado State University Fort Collins CO USA

Abstract The processes of new particle formation (NPF) and growth are important contributors to cloud condensation nuclei (CCN) concentrations, and CCN are important for climate from their impact on planetary radiative forcing. While the general ubiquity and importance of NPF is understood, the vertical extent and governing mechanisms of NPF and growth in the lower troposphere are uncertain. We present an analysis of four NPF events and two non‐NPF events during the HI‐SCALE field campaign at the Southern Great Plains observatory in Oklahoma, USA. First, we analyzed airborne and ground‐based observations of aerosol and gas‐phase properties. Second, we used a column aerosol chemistry and microphysics model to probe factors that influence the vertical profile of NPF. During HI‐SCALE, we found several instances of enhanced NPF occurring several hundred meters above the surface; however, the spatio‐temporal characteristics of the observed NPF made comparisons between airborne‐ and ground‐based observations difficult. The model represented the observed NPF (or lack of NPF) and particle growth at the surface to final diameters within 10 nm. The model predicted enhanced NPF rates in the upper mixed layer, and this enhancement is primarily due to the temperature dependence in the NPF schemes, but this was also dependent on the vertical profile of gas‐phase precursors measured during HI‐SCALE. We found vertical mixing in the model either enhanced or suppressed NPF rates, aerosol number concentrations, and particle growth rates at the surface. Finally, our analysis provides insights for future field campaigns and modeling efforts investigating the vertical profile of NPF.

Research Organization:
ARM Data Center, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
National Oceanic and Atmospheric Administration (NOAA); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC06-76RL01830; SC0012704; SC0017975; SC0019000; SC0021208
OSTI ID:
1922528
Report Number(s):
BNL-223948-2023-JAAM; PNNL-SA-176018; e2022JD037525
Journal Information:
Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 3 Vol. 128; ISSN 2169-897X
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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