Assessing the link between chlorophyll concentration and absorption line height at 676 nm over a broad range of water types

作者：Nardelli Schuyler C^*; Twardowski Michael S

来源：Optics Express, 2016, 24(22): A1374-A1389.

DOI：10.1364/OE.24.0A1374

The relationship between absorption at 676 nm normalized to chlorophyll-a, i. e., specific absorption a(ph)*(676), and various optical and environmental properties is examined in extensive data sets from Case I and Case II waters found globally to assess drivers of variability such as pigment packaging. A better understanding of this variability could lead to more accurate estimates of chlorophyll concentrations from in situ optical measurements that may be made autonomously. Values of a(ph)*(676) ranged from 0.00006 to 0.0944 m(2)/mg Chl a across all sites studied, but converged on median and mean values (n = 563) of 0.0108 and 0.0139 m(2)/mg Chl a respectively, with no apparent relationship with various optical properties, latitude, coastal or open ocean environment, depth, temperature, salinity, photoadaptation, ecosystem health, or albedo. Relative consistency in a(ph)* across such diverse water types and the full range in chlorophyll concentration suggests a single a(ph)* may be used to estimate chlorophyll concentration from absorption measurements with better accuracy than currently thought.

• 出版日期2016-10-31