Publication Abstracts

Fridlind and Ackerman 2011

Fridlind, A.M., and A.S. Ackerman, 2011: Estimating the sensitivity of radiative impacts of shallow, broken marine clouds to boundary-layer aerosol size distribution parameter uncertainties for satellite retrieval requirements. J. Atmos. Ocean. Technol., 28, 530-538, doi:10.1175/2010JTECHA1520.1.

A proposed objective of the planned Aerosol-Cloud-Ecosystem (ACE) satellite mission is to provide constraints on climate model representation of aerosol effects on clouds by retrieving profiles of aerosol number concentration, effective variance, and effective radius over the 0.1-1-µm radius range under humidified ambient conditions with 500-m vertical resolution and uncertainties of 100%, 50%, and 10%, respectively. Shallow, broken marine clouds provide an example of conditions where boundary-layer aerosol properties would be retrieved in clear-sky gaps. To quantify the degree of constraint that proposed retrievals might provide on cloud radiative forcing (CRF) simulated by climate models under such conditions, dry aerosol size distribution parameters are independently varied here in large-eddy simulations of three well-established modeling case studies. Using rudimentary available aerosol specifications, we find that relative changes of total dry aerosol properties in simulations can be used as a proxy for relative changes of ambient aerosol properties targeted by ACE retrievals. The sensitivity of simulated daytime shortwave CRF to the proposed uncertainty in retrieved aerosol number concentration is -14 W/m2 in the overcast limit, roughly a factor of two smaller than a simple analytic estimate owing primarily to aerosol-induced reductions in simulated liquid water path across this particular set of case studies. The CRF sensitivity to proposed uncertainties in retrieved aerosol effective variance and effective radius is typically far smaller, with no corresponding analytic estimate. Generalization of the results obtained here using only three case studies would require statistical analysis of relevant meteorological and aerosol observations and quantification of observational and model uncertainties and biases.

  • Get PDF (1.2 MB. Document includes appended erratum published in J. Atmos. Ocean. Tech., 28, 974, doi:10.1175/JTECH-D-11-00098.1.)
  • PDF documents require the free Adobe Reader or compatible viewing software to be viewed.
  • Go to journal webpage

Export citation: [ BibTeX ] [ RIS ]

BibTeX Citation

@article{fr07100z,
  author={Fridlind, A. M. and Ackerman, A. S.},
  title={Estimating the sensitivity of radiative impacts of shallow, broken marine clouds to boundary-layer aerosol size distribution parameter uncertainties for satellite retrieval requirements},
  year={2011},
  journal={J. Atmos. Ocean. Technol.},
  volume={28},
  pages={530--538},
  doi={10.1175/2010JTECHA1520.1},
}

[ Close ]

RIS Citation

TY  - JOUR
ID  - fr07100z
AU  - Fridlind, A. M.
AU  - Ackerman, A. S.
PY  - 2011
TI  - Estimating the sensitivity of radiative impacts of shallow, broken marine clouds to boundary-layer aerosol size distribution parameter uncertainties for satellite retrieval requirements
JA  - J. Atmos. Ocean. Technol.
VL  - 28
SP  - 530
EP  - 538
DO  - 10.1175/2010JTECHA1520.1
ER  -

[ Close ]

• Return to 2011 Publications

• Return to Publications Homepage