Temporal profiles of BIX for SML and ULW samples during Leg 2 juxtaposed with PAR. Note changes in BIX (calculated according to Eq. 3) for the SML and ULW following the maximum in PAR intensity (in μmol m–2 s–1) around noon (UTC). DOI: https://doi.org/10.1525/elementa.278.f8