Accession Number:

AD1099914

Title:

Current State of the Global Operational Aerosol Multi-Model Ensemble: An Update from the International Cooperative for Aerosol Prediction (ICAP)

Descriptive Note:

Journal Article - Open Access

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States

Report Date:

2019-04-02

Pagination or Media Count:

34.0

Abstract:

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.

Subject Categories:

  • Theoretical Mathematics
  • Physical Chemistry
  • Physical and Dynamic Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE