Abstract View
Linking Upwind Marine Biological and Meteorological Processes to Local Marine Particle Concentrations With Flexpart
KEVIN SANCHEZ, Bo Zhang, Hongyu Liu, Michael Shook, Ewan Crosbie, Luke Ziemba, Matthew Brown, Claire Robinson, Taylor Shingler, Kenneth Thornhill, Edward Winstead, Bruce Anderson, Chris Hostetler, Georges Saliba, Chia-Li Chen, Savannah Lewis, Lynn Russell, Michael Behrenfeld, Richard Moore, NASA
Abstract Number: 115
Working Group: Aerosols, Clouds and Climate
Abstract
Marine biogenic particles contribute to cloud condensation nuclei (CCN) concentrations and hence cloud optical properties. Correlations between local marine biological processes and marine particle concentrations are often observed to be weak in published studies. In this study, several satellite measured and model simulated ocean biological quantities were analyzed along air parcel backtrajectories derived from FLEXPART, a Lagrangian particle dispersion model, to identify links between upstream marine biological variables, representative of the marine biomass, to shipboard measurements of particle concentrations and composition. Similarly, meteorological variables associated with particle sources and sinks were analyzed along these FLEXPART trajectories to identify the contribution of physical meteorological processes to particle measurements and further deconvolute the parcel hysteresis effect on measured marine particle concentrations. This analysis uses data from the North Atlantic Aerosols and Marine Ecosystems Study (NAAMES), which was conducted to better understand the effect of marine biological processes on marine particle concentrations. NAAMES consisted of four combined ship and aircraft field campaigns, between November 2015 and April 2018 that aligned with changes to the annual phytoplankton bloom cycle. This study is ideal for examining differences in seasonal marine biogenic contributions to particle concentration and composition. Results indicate phytoplankton net primary production correlated with organic aerosol mass, and down welling shortwave forcing correlated with both organic and sulfate aerosol mass when averaging over two day FLEXPART trajectories. In addition, wind speed negatively correlates with aerosol mass and number over five day trajectories. Observed wind speed enhance primary marine emissions and enhance total particle surface area. This suggest upstream wind speed may influence measured particle mass and concentration by enhancing total particle surface area, leading to increased scavenging of volatile compounds, decreasing the potential of smaller particle growth and new particle formation.