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Title: Light absorption enhancement of black carbon in a pyrocumulonimbus cloud

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6];  [7]; ORCiD logo [2]
  1. Washington Univ., St. Louis, MO (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. Washington Univ., St. Louis, MO (United States)
  3. National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Chemical Sciences Laboratory (CSL)
  4. Meteorological Research Inst. (MRI), Tsukuba (Japan)
  5. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  6. Colgate University, Hamilton, NY (United States); Univ. of Colorado, Boulder, CO (United States)
  7. National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Chemical Sciences Laboratory (CSL); Univ. of Colorado, Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences (CIRES); BAE Systems, Inc., Boulder, CO (United States)

Pyrocumulonimbus (pyroCb) firestorm systems have been shown to inject significant amounts of black carbon (BC) to the stratosphere with a residence time of several months. Injected BC warms the local stratospheric air, consequently perturbing transport and hence spatial distributions of ozone and water vapor. A distinguishing feature of BC-containing particles residing within pyroCb smoke is their thick surface coatings made of condensed organic matter. When coated with non-refractory materials, BC’s absorption is enhanced, yet the absorption enhancement factor (Eabs) for pyroCb BC is not well constrained. Here, we perform particle-scale measurements of BC mass, morphology, and coating thickness from inside a pyroCb cloud and quantify Eabs using an established particle-resolved BC optics model. We find that the population-averaged Eabs for BC asymptotes to 2.0 with increasing coating thickness. This value denotes the upper limit of Eabs for thickly coated BC in the atmosphere. Our results provide observationally constrained parameterizations of BC absorption for improved radiative transfer calculations of pyroCb events.

Research Organization:
Battelle Memorial Institute, Columbus, OH (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Oceanic and Atmospheric Administration (NOAA); National Science Foundation (NSF); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-76RL01830; SC0021011
OSTI ID:
2466259
Report Number(s):
PNNL-SA--195821
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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