Extended Data Fig. 9: Synchrotron-based element maps used to determine mass of particulate iron associated with a puff-type colony.
Synchrotron-based element maps used to determine mass of particulate iron associated with a puff-type colony, data originally collected as in Held et al., 202020. The left image is the X-ray fluorescence-based concentration, the middle image represents pixels with sufficiently high Fe to be considered a particle, and the right image is the product of the left and middle images. The total particulate Fe was determined as the area integrated Fe of the right image. The scale bar represents 180 microns. As detailed in Held et al., 2021, five Trichodesmium colonies of differing morphologies and degrees of particle association were examined in this way. These images are representative of a Trichodesmium colony with average-to-high particle loading.
