气候变化领域集成服务门户(CCPortal): Reflectances transect from coast to open sea, Baltic Sea

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.831721
	Reflectances transect from coast to open sea, Baltic Sea
	Beltrán-Abaunza; José M; Kratzer; Susanne; Brockmann; Carsten
发布日期	2014-04-11
数据集类型	dataset
英文简介	In this study, retrievals of the medium resolution imaging spectrometer (MERIS) reflectances and water quality products using 4 different coastal processing algorithms freely available are assessed by comparison against sea-truthing data. The study is based on a pair-wise comparison using processor-dependent quality flags for the retrieval of valid common macro-pixels. This assessment is required in order to ensure the reliability of monitoring systems based on MERIS data, such as the Swedish coastal and lake monitoring system (http.vattenkvalitet.se). The results show that the pre-processing with the Improved Contrast between Ocean and Land (ICOL) processor, correcting for adjacency effects, improve the retrieval of spectral reflectance for all processors, Therefore, it is recommended that the ICOL processor should be applied when Baltic coastal waters are investigated. Chlorophyll was retrieved best using the FUB (Free University of Berlin) processing algorithm, although overestimations in the range 18-26.5%, dependent on the compared pairs, were obtained. At low chlorophyll concentrations (< 2.5 mg/m**3), random errors dominated in the retrievals with the MEGS (MERIS ground segment processor) processor. The lowest bias and random errors were obtained with MEGS for suspended particulate matter, for which overestimations in te range of 8-16% were found. Only the FUB retrieved CDOM (Coloured Dissolved Organic Matter) correlate with in situ values. However, a large systematic underestimation appears in the estimates that nevertheless may be corrected for by using a~local correction factor. The MEGS has the potential to be used as an operational processing algorithm for the Himmerfjärden bay and adjacent areas, but it requires further improvement of the atmospheric correction for the blue bands and better definition at relatively low chlorophyll concentrations in presence of high CDOM attenuation.
空间范围	Median Latitude: 58.613253 * Median Longitude: 17.453285 * South-bound Latitude: 58.495460 * West-bound Longitude: 17.346395 * North-bound Latitude: 58.730990 * East-bound Longitude: 17.559708
时间范围	2008-07-28T00:00:00 - 2008-07-28T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/234055
推荐引用方式 GB/T 7714	Beltrán-Abaunza,José M,Kratzer,et al. Reflectances transect from coast to open sea, Baltic Sea.2014-04-11.https://doi.org/10.1594/PANGAEA.831721.