Ground truth data on chlorophyll-<i>a</i>, chromophoric dissolved organic matter and suspended sediment concentrations in the upper water layer as obtained by LIF lidar at high spatial resolution

Pelevin, Vadim; Zlinszky, András; Khimchenko, Elizaveta; Tóth, Viktor R.

doi:10.1080/01431161.2016.1274446

Cited by 21 publications

(19 citation statements)

References 21 publications

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“…Recently, it was used on the Lake Balaton in Hungary, whose geometric dimensions, shape and the water optical properties are similar to the Gorky Reservoir. As a result, high-quality ground-truth LiDAR data were obtained and used for calibration L2 MODIS data [52].…”

Section: Lidar Measurementsmentioning

confidence: 99%

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Regional Models for High-Resolution Retrieval of Chlorophyll a and TSM Concentrations in the Gorky Reservoir by Sentinel-2 Imagery

et al. 2019

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The possibilities of chlorophyll a (Chl a) and total suspended matter (TSM) retrieval using Sentinel-2/MSI imagery and in situ measurements in the Gorky Reservoir are investigated. This water body is an inland freshwater ecosystem within the territory of the Russian Federation. During the algal bloom period, the optical properties of water are extremely heterogeneous and vary on scales of tens of meters. Additionally, they vary in time under the influence of currents and wind forcing. In this case, the usage of the traditional station-based sampling to describe the state of the reservoir may be uninformative and not rational. Therefore, we proposed an original approach based on simultaneous in situ measurements of the remote sensing reflectance by a single radiometer and the concentration of water constituents by an ultraviolet fluorescence LiDAR from a high-speed gliding motorboat. This approach provided fast data collection including 4087 synchronized LiDAR and radiometric measurements with high spatial resolutions of 8 m for two hours. A part of the dataset was coincided with Sentinel-2 overpass and used for the development of regional algorithms for the retrieval of Chl a and TSM concentrations. For inland waters of the Russian Federation, such research was performed for the first time. The proposed algorithms can be used for regular environmental monitoring of the Gorky Reservoir using ship measurements or Sentinel-2 images. Additionally, they can be adapted for neighboring reservoirs, for example, for other seven reservoirs on the Volga River. Moreover, the proposed ship measurement approach can be useful in the practice of limnological monitoring of inland freshwater ecosystems with high spatiotemporal variability of the optical properties.

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Section: Lidar Measurementsmentioning

confidence: 99%

“…Tested on a great number of water bodies, it allows measuring bio-optical properties with high accuracy for non-contact and express methods. According to [37,52] the total relative measurement error of UFL-9 is 10% for TSM and CDOM and 16% for Chl a. LiDAR signals processing and its calibration are exhaustively described in [53].…”

Section: Lidar Measurementsmentioning

confidence: 99%

Regional Models for High-Resolution Retrieval of Chlorophyll a and TSM Concentrations in the Gorky Reservoir by Sentinel-2 Imagery

et al. 2019

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“…Optical remote sensing was performed by a ship-mounted ultraviolet fluorescent LiDAR (UFL) and was used to derive simultaneous concentrations of chlorophyll a (Chl-a), total suspended matter (TSM), and colored dissolved organic matter (CDOM) at the sea surface with a 250 m spatial resolution along the ship track. The explicit description of the UFL instrument and the algorithms used for retrieving Chl-a, TSM, and CDOM are given in Palmer et al [2013] and Pelevin et al [2017].…”

Section: 1002/2016jc012603mentioning

confidence: 99%

Structure of the buoyant plume formed by Ob and Yenisei river discharge in the southern part of the Kara Sea during summer and autumn

et al. 2017

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This article focuses on the interaction between the Ob‐ and Yenisei‐dominated parts of the large Ob‐Yenisei buoyant plume formed in the southern part of the Kara Sea during ice‐free periods. It was shown that certain wind forcing and river discharge conditions cause the formation of a specific structure of the Ob‐Yenisei plume with significantly different properties of the Ob‐ and Yenisei‐dominated water masses. Under these conditions, the Yenisei runoff generates a narrow coastal current propagating northward from the Yenisei Gulf along the Taymyr Peninsula, which is isolated by the Ob‐dominated water mass from ambient sea water. As a result, the low‐salinity Yenisei‐dominated water mass occupies a relatively small area, while more saline Ob‐dominated water mass spreads over a wide area between the Gulf of Ob and the Taymyr Peninsula. The formation of the “isolation” configuration of the Ob‐Yenisei plume described above is presumed to be caused by the eastward Ekman transport and the resulting downwelling flow of the Ob‐dominated waters under the low‐saline and warm Yenisei‐dominated waters along the Taymyr Peninsula. Based on satellite imagery, wind reanalysis, and river discharge data collected and derived for the period of 2005–2011, it was estimated that the “isolation” configuration is regularly formed during late summer and autumn when the Ob discharge to the Kara Sea exceeds the Yenisei discharge and the local atmospheric circulation is dominated by the northerly wind regime. Assessment of the frequency and duration of the occurrence of the “isolation” configuration showed their synoptic time scale and significant interannual variability.

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“…In addition to the measurements at stations and moorings, continuous measurements of chlorophyll-"a" and total 110 suspended matter using ultraviolet fluorescent LiDAR UFL-9 were conducted along the ship's track. The details of the LiDAR and methodology of this kind of measurements providing horizontal resolution of about 10 m were described by Palmer et al (2013), Pelevin et al (2017), Zavialov et al (2017). In the cruise of 2016, the continuous along-track measurements also included soundings of temperature and electric conductivity in the uppermost layer using a pump-through system and the shipboard YSI6600 CTD instrument, which allowed for horizontal resolution 115 in the along-track direction of the order of 100 m. As mentioned above, in all cases we used the empirical formula proposed by Peeters et al (2003) to infer salinity from temperature, electric conductivity, and pressure.…”

Section: Datamentioning

confidence: 99%

New profiling and mooring records help to assess variability of Lake Issyk-Kul and reveal unknown features of its thermohaline structure

Zavialov¹,

Izhitskiy²,

Kirillin³

et al. 2018

Preprint

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Abstract. This article reports the results of 3 field campaigns conducted in Lake Issyk-Kul in 2015, 2016, and 2017. Vertical CTD profiles were obtained and water samples collected at the total of 75 stations. Some biogeochemical and thermohaline parameters at the lake surface were also mapped at high horizontal resolution along the ship’s track. In addition, thermistor chains were deployed at 3 mooring stations in the eastern littoral region of the lake, yielding 147 days long records of temperature data. The measurements revealed that while the thermal state of the active layer, as well as some biogeochemical characteristics, were subject to significant interannual variability mediated by atmospheric forcing, the haline structure of the entire lake was remarkably stable at the interannual scale. Our data do not confirm the reports of progressive warming of the deep Issyk-Kul waters as suggested in some previous publications. However, they do indicate positive trend of salinity in the lake’s interior over the last 3 decades. A noteworthy newly found feature is a weak but persistent salinity maximum below the thermocline at the depth of 70–120 m, from where salinity slightly decreased downwards. The data from the moored thermistor chains support previously published hypothesis about significant role of the submerged ancient riverbeds on the eastern shelf in advecting littoral waters into the deep portion of the lake during differential cooling period. We hypothesize that the less saline littoral water penetrating into the deep layers due to this mechanism is responsible for the abovementioned features of salinity profile, and substantiate this hypothesis by estimates based on simple model assumptions.

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Ground truth data on chlorophyll-a, chromophoric dissolved organic matter and suspended sediment concentrations in the upper water layer as obtained by LIF lidar at high spatial resolution

Cited by 21 publications

References 21 publications

Regional Models for High-Resolution Retrieval of Chlorophyll a and TSM Concentrations in the Gorky Reservoir by Sentinel-2 Imagery

Regional Models for High-Resolution Retrieval of Chlorophyll a and TSM Concentrations in the Gorky Reservoir by Sentinel-2 Imagery

Structure of the buoyant plume formed by Ob and Yenisei river discharge in the southern part of the Kara Sea during summer and autumn

New profiling and mooring records help to assess variability of Lake Issyk-Kul and reveal unknown features of its thermohaline structure

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