How Uncertainty in Field Measurements of Ice Nucleating Particles Influences Modeled Cloud Forcing
Name
jas-d-17-0089.1.pdf
Size
591.99 KB
Format
Adobe PDF
Checksum (MD5)
3626261e6417e75ddfbae0a11d1aaf0c
Author(s)
Cziczo, Daniel James
Garimella, Sarvesh
Rothenberg, Daniel Abram
Wolf, Martin Johann
Wang, C.
Date Issued
January 2018
Journal
Journal of the Atmospheric Sciences
Publisher
American Meteorological Society
Citation
Garimella, S. et al. “How Uncertainty in Field Measurements of Ice Nucleating Particles Influences Modeled Cloud Forcing.” Journal of the Atmospheric Sciences 75, 1 (January 2018): 179–187 © 2018 American Meteorological Society
Version
Final published version
Abstract
Field and laboratory measurements using continuous flow diffusion chambers (CFDCs) have been used to construct parameterizations of the number of ice nucleating particles (INPs) in mixed-phase and completely glaciated clouds in weather and climate models. Because of flow nonidealities, CFDC measurements are subject to systematic low biases. Here, the authors investigate the effects of this undercounting bias on simulated cloud forcing in a global climate model. The authors assess the influence of measurement variability by constructing a stochastic parameterization framework to endogenize measurement uncertainty. The authors find that simulated anthropogenic longwave ice-bearing cloud forcing in a global climate model can vary up to 0.8 W m-2and can change sign from positive to negative within the experimentally constrained bias range. Considering the variability in the undercounting bias, in a range consistent with recent experiments, leads to a larger negative cloud forcing than that when the variability is ignored and only a constant bias is assumed. Keywords: Clouds; Aerosols; Climate change; Cloud microphysics; Ice crystals; Ice particles
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1175/JAS-D-17-0089.1
