PAR_avg photoC_sp CaCO3_form photoC_diat photoC_diaz sp_N_lim sp_Fe_lim sp_PO4_lim sp_light_lim diat_N_lim diat_Fe_lim diat_PO4_lim diat_SiO3_lim diat_light_lim diaz_Fe_lim diaz_P_lim diaz_light_lim diaz_Nfix bSi_form spC spChl spCaCO3 diatC diatChl zooC spFe diatSi diatFe diazC diazChl diazFe