Current state of the global operational aerosol multi‐model ensemble: An update from the International Cooperative for Aerosol Prediction (ICAP)

Since the first International Cooperative for Aerosol Prediction (ICAP) multi‐model ensemble (MME) study, the number of ICAP global operational aerosol models has increased from five to nine. An update of the current ICAP status is provided, along with an evaluation of the performance of ICAP‐MME ov...

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Published in:Quarterly journal of the Royal Meteorological Society 2019-09, Vol.145 (S1), p.176-209
Main Authors: Xian, Peng, Reid, Jeffrey S., Hyer, Edward J., Sampson, Charles R., Rubin, Juli I., Ades, Melanie, Asencio, Nicole, Basart, Sara, Benedetti, Angela, Bhattacharjee, Partha S., Brooks, Malcolm E., Colarco, Peter R., da Silva, Arlindo M., Eck, Tom F., Guth, Jonathan, Jorba, Oriol, Kouznetsov, Rostislav, Kipling, Zak, Sofiev, Mikhail, Perez Garcia‐Pando, Carlos, Pradhan, Yaswant, Tanaka, Taichu, Wang, Jun, Westphal, Douglas L., Yumimoto, Keiya, Zhang, Jianglong
Format: Article
Language:English
Subjects:
aerosol
aerosol forecast
aerosol modelling
Aerosol models
Aerosol optical depth
Aerosols
Atmospheric and Oceanic Physics
Atmospheric particulates
Data assimilation
Data collection
Dust storms
ensemble
Forecast errors
global aerosol model
Global aerosols
Imaging techniques
multi‐model ensemble
operational aerosol forecast
Optical analysis
Physics
probabilistic forecast
Regression analysis
Regression models
Sciences of the Universe
Special Supplement on 25 Years of Ensemble Forecasting
Spectroradiometers
Supplement
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Summary:Since the first International Cooperative for Aerosol Prediction (ICAP) multi‐model ensemble (MME) study, the number of ICAP global operational aerosol models has increased from five to nine. An update of the current ICAP status is provided, along with an evaluation of the performance of ICAP‐MME over 2012–2017, with a focus on June 2016–May 2017. Evaluated with ground‐based Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) and data assimilation quality MODerate‐resolution Imaging Spectroradiometer (MODIS) retrieval products, the ICAP‐MME AOD consensus remains the overall top‐scoring and most consistent performer among all models in terms of root‐mean‐square error (RMSE), bias and correlation for total, fine‐ and coarse‐mode AODs as well as dust AOD; this is similar to the first ICAP‐MME study. Further, over the years, the performance of ICAP‐MME is relatively stable and reliable compared to more variability in the individual models. The extent to which the AOD forecast error of ICAP‐MME can be predicted is also examined. Leading predictors are found to be the consensus mean and spread. Regression models of absolute forecast errors were built for AOD forecasts of different lengths for potential applications. ICAP‐MME performance in terms of modal AOD RMSEs of the 21 regionally representative sites over 2012–2017 suggests a general tendency for model improvements in fine‐mode AOD, especially over Asia. No significant improvement in coarse‐mode AOD is found overall for this time period. International Cooperative for Aerosol Predictions (ICAP) model 550 nm total AOD RMSE of the 72 h forecast versus corresponding mean AODs for AERONET sites listed in Table 2. Large black dots are ICAP multi‐model ensemble consensus means. Individual models are in small coloured dots. Validation of fine‐ and coarse‐modal AODs and dust AOD is also available in Figure 2.
ISSN:0035-9009
1477-870X
DOI:10.1002/qj.3497