Bio-optical anomalies in the world's oceans: An investigation on the diffuse attenuation coefficients for downward irradiance derived from Biogeochemical Argo float measurements

被引:45
作者
Organelli, Emanuele [1 ,2 ]
Claustre, Herve [1 ]
Bricaud, Annick [1 ]
Barbieux, Marie [1 ]
Uitz, Julia [1 ]
D'Ortenzio, Fabrizio [1 ]
Dall'Olmo, Giorgio [2 ,3 ]
机构
[1] UPMC Univ Paris 06, Sorbonne Univ, LOV, CNRS,UMR 7093, Villefranche Sur Mer, France
[2] Plymouth Marine Lab, Plymouth, Devon, England
[3] Plymouth Marine Lab, Natl Ctr Earth Observat, Plymouth, Devon, England
基金
英国自然环境研究理事会; 欧洲研究理事会;
关键词
bio-optical anomalies; light attenuation; Biogeochemical Argo floats; global ocean; colored dissolved organic matter; DISSOLVED ORGANIC-MATTER; PHYTOPLANKTON COMMUNITY COMPOSITION; MEDITERRANEAN SEA; LIGHT-ABSORPTION; SPECTRAL ABSORPTION; OPTICAL-PROPERTIES; SEASONAL DYNAMICS; BIOGENOUS MATTER; YELLOW SUBSTANCE; BEAM ATTENUATION;
D O I
10.1002/2016JC012629
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Identification of oceanic regions characterized by particular optical properties is extremely important for ocean color applications. The departure from globally established bio-optical models (i.e., anomaly) introduces uncertainties in the retrieval of biogeochemical quantities from satellite observations. Thanks to an array of 105 Biogeochemical Argo floats acquiring almost daily downward irradiance measurements at selected wavelengths in the UV and blue region of the spectrum, we reexamined the natural variability of the spectral diffuse attenuation coefficients, K-d(), among the world's oceans and compared them to previously established bio-optical models. The analysis of 2847 measurements of K-d() at 380 and 490 nm, within the first optical depth, provided a classification of the examined regions into three groups. The first one included the Black Sea, a water body characterized by a very high content of colored dissolved organic matter (CDOM). The second group was essentially composed by the subtropical gyres (Atlantic and Pacific Oceans), with optical properties consistent with previous models (i.e., no anomalies). High latitude (North Atlantic and Southern oceans) and temperate (Mediterranean Sea) seas formed the third group, in which optical properties departed from existing bio-optical models. Annual climatologies of the K-d(380)/K-d(490) ratio evidenced a persistent anomaly in the Mediterranean Sea, that we attributed to a higher-than-average CDOM contribution to total light absorption. In the North Atlantic subpolar gyre, anomalies were observed only in wintertime and were also attributed to high CDOM concentrations. In the Southern Ocean, the anomaly was likely related to high phytoplankton pigment packaging rather than to CDOM.
引用
收藏
页码:3543 / 3564
页数:22
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