Aqua MODIS Level-4 Global Binned Garver-Siegel-Maritorena Model (GSM) Data, version 2022.0

The GSM data suite provides ocean-color fields derived by inverting water-leaving reflectance with the Garver–Siegel–Maritorena (GSM/GSM01) semi-analytical model. GSM’s advantage is that it retrieves multiple optical properties simultaneously from a reflectance spectrum and offers a more physics-based alternative to simple band-ratio chlorophyll algorithms. Geophysical variables in this suite include: - adg_443_gsm – Absorption by gelbstoff and detrital material at 443 nm, GSM algorithm (m⁻¹) - bbp_443_gsm – Particulate backscattering at 443 nm, GSM algorithm (m⁻¹) - chl_gsm – Chlorophyll-a concentration, GSM model (mg m⁻³)