Articles | Volume 21, issue 13
Atmos. Chem. Phys., 21, 10499–10526, 2021
https://doi.org/10.5194/acp-21-10499-2021

Special issue: Marine aerosols, trace gases, and clouds over the North Atlantic...

Atmos. Chem. Phys., 21, 10499–10526, 2021
https://doi.org/10.5194/acp-21-10499-2021

Research article 13 Jul 2021

Research article | 13 Jul 2021

Cloud drop number concentrations over the western North Atlantic Ocean: seasonal cycle, aerosol interrelationships, and other influential factors

Hossein Dadashazar et al.

Data sets

CERES Edition-2 Cloud Property Retrievals Using TRMM VIRS and Terra and Aqua MODIS Data - Part I: Algorithms (https://ceres.larc.nasa.gov/data/) P. Minnis, S. Sun-Mack, D. F. Young, P. W. Heck, D. P. Garber, Y. Chen, D. A. Spangenberg, R. F. Arduini, Q. Z. Trepte, W. L. Smith, J. K. Ayers, S. C. Gibson, W. F. Miller, G. Hong, V. Chakrapani, Y. Takano, K. N. Liou, Y. Xie, and P. Yang https://doi.org/10.1109/Tgrs.2011.2144601

CALIPSO LID L2 Standard HDF File - Version 3.30 CALIPSO https://subset.larc.nasa.gov/calipso/

The CHRS Data Portal, an easily accessible public repository for PERSIANN global satellite precipitation data (https://chrsdata.eng.uci.edu/) P. Nguyen, E. J. Shearer, H. Tran, M. Ombadi, N. Hayatbini, T. Palacios, P. Huynh, D. Braithwaite, G. Updegraff, K. Hsu, B. Kuligowski, W. S. Logan, and S. Sorooshian https://doi.org/10.1038/sdata.2018.296

MERRA-2 Global Modeling and Assimilation Office (GMAO) https://disc.gsfc.nasa.gov/

The Two-Column Aerosol Project: Phase IOverview and impact of elevated aerosol layers on aerosol optical depth (https://adc.arm.gov/discovery) Berg, L. K., Fast, J. D., Barnard, J. C., et al. https://doi.org/10.1002/2015jd023848

ACTIVATE Falcon In Situ Aerosol Data NASA/LARC/SD/ASDC https://doi.org/10.5067/ASDC/ACTIVATE_Aerosol_AircraftInSitu_Falcon_Data_1

ACTIVATE Falcon In Situ Cloud Data NASA/LARC/SD/ASDC https://doi.org/10.5067/ASDC/ACTIVATE_Cloud_AircraftInSitu_Falcon_Data_1

ACTIVATE Falcon In-Situ Meteorological and Navigational Data NASA/LARC/SD/ASDC https://doi.org/10.5067/ASDC/ACTIVATE_MetNav_AircraftInSitu_Falcon_Data_1

Model code and software

Python Accumulated Local Effects package M. Jumelle, A. Kuhn-Regnier, S. Rajaratnam, and A. Mahima https://github.com/blent-ai/ALEPython

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Short summary
This study investigates the seasonal cycle of cloud drop number concentration (Nd) over the western North Atlantic Ocean (WNAO) using multiple datasets. Reasons for the puzzling discrepancy between the seasonal cycles of Nd and aerosol concentration were identified. Results indicate that Nd is highest in winter (when aerosol proxy values are often lowest) due to conditions both linked to cold-air outbreaks and that promote greater droplet activation.
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