Retrieval of coccolithophore calcite concentration from SeaWiFS imagery
Retrieval of coccolithophore calcite concentration from SeaWiFS imagery
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DOI：
10.1029/2000gl012025
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发表时间：
2001-04-15
影响因子：
5.2
通讯作者：
Smyth, TJ
中科院分区：
文献类型：
--
作者：
Gordon, HR;Boynton, GC;Smyth, TJ
我们研究了球石藻E. huxleyi，在SeaWiFS图像中观察到的，具有用于检索分离的颗石浓度的新算法。该算法仅使用红色和近红外（NIR）中的SeaWiFS波段，以最大限度地减少叶绿素和溶解有机物质吸收的影响。我们使用已发表的实验测定的方解石特定的后向散射及其光谱依赖性，并假设介质的吸收系数是纯水，估计海洋的贡献SeaWiFS辐射。气溶胶和瑞利-气溶胶相互作用对辐射的贡献被模拟为波长的指数函数。这使得可以从SeaWiFS图像中逐个像素地推导出颗石浓度。应用程序1999年7月30日SeaWIFS图像的绽放南部普利茅斯，英国表明，SeaWiFS的估计是在良好的协议与表面测量的颗石浓度。
We examined blooms of the coccolithophorid E. huxleyi, observed in SeaWiFS imagery, with a new algorithm for the retrieval of detached coccolith concentration. The algorithm uses only SeaWiFS bands in the red and near infrared (NIR) to minimize the influence of the absorption by chlorophyll and dissolved organic material. We used published experimental determinations of the calcite specific backscattering and its spectral dependence, and assumed that the absorption coefficient of the medium was that of pure water, to estimate the marine contribution to the SeaWiFS radiance. The aerosol land Rayleigh-aerosol interaction) contribution to the radiance was modeled as an exponential function of wavelength. These allow derivation of the coccolith concentration on a pixel-by-pixel basis from SeaWiFS imagery. Application to a July 30, 1999 SeaWIFS image of a bloom south of Plymouth, UK indicates that the SeaWiFS estimates are in good agreement with surface measurements of coccolith concentration.