The retrieval of sun-induced chlorophyll fluorescence is greatly beneficial to studies of marine phytoplankton biomass, physiology, and composition, and is required for user applications and services. Customarily phytoplankton chlorophyll fluorescence is determined from satellite measurements through a fluorescence line-height algorithm using three bands around 680 nm. We propose here a modified retrieval, making use of all available bands in the relevant wavelength range, with the goal to improve the effectiveness of the algorithm in optically complex waters. For the Ocean and Land Colour Instrument (OLCI), we quantify a Fluorescence Peak Height by fitting a Gaussian function and related terms to the top-of-atmosphere reflectance bands between 650 and 750 nm. This algorithm retrieves, what we call Fluorescence Peak Height by fitting a Gaussian function upon other terms to top-of-atmosphere reflectance bands between 650 and 750 nm. This approach is applicable to Level-1 and Level-2 data. We find a good correlation of the retrieved fluorescence product to global in-situ chlorophyll measurements, as well as a consistent relation between chlorophyll concentration and fluorescence from radiative transfer modelling and OLCI/in-situ comparison. Evidence suggests, the algorithm is applicable to complex waters without needing an atmospheric correction and vicarious calibration, and features an inherent correction of small spectral shifts, as required for OLCI measurements.

中文翻译：

---

OLCI L-1b和L-2应用于海洋颜色测量中的太阳诱导叶绿素荧光的新检索

太阳诱导的叶绿素荧光的检索对海洋浮游植物生物量，生理学和组成的研究非常有益，并且是用户应用和服务所必需的。通常，通过使用680 nm附近的三个波段，通过荧光线高度算法，通过卫星测量确定浮游植物的叶绿素荧光。我们在这里提出一种修改后的检索方法，利用相关波长范围内的所有可用波段，以提高算法在光学复杂水域中的有效性。对于海洋和陆地颜色仪器（OLCI），我们通过将高斯函数和相关项拟合到650和750 nm之间的大气顶部反射带来量化荧光峰高。该算法检索 我们通过在其他术语上拟合高斯函数到650和750 nm之间的大气顶部反射带来称为荧光峰高。此方法适用于Level-1和Level-2数据。从辐射转移模型和OLCI /原位比较中，我们发现检索到的荧光产物与全球原位叶绿素测量值之间具有良好的相关性，以及叶绿素浓度与荧光之间的一致关系。有证据表明，该算法适用于复杂的水域，无需进行大气校正和替代校准，并且具有OLCI测量所需的小光谱偏移的固有校正功能。从辐射转移模型和OLCI /原位比较中，我们发现检索到的荧光产物与全球原位叶绿素测量值之间具有良好的相关性，以及叶绿素浓度与荧光之间的一致关系。有证据表明，该算法适用于复杂的水域，无需进行大气校正和替代校准，并且具有OLCI测量所需的固有的小光谱偏移校正功能。从辐射转移模型和OLCI /原位比较中，我们发现检索到的荧光产物与全球原位叶绿素测量值之间具有良好的相关性，以及叶绿素浓度与荧光之间的一致关系。有证据表明，该算法适用于复杂的水域，无需进行大气校正和替代校准，并且具有OLCI测量所需的固有的小光谱偏移校正功能。