Determination of the concentration of mineral particles and suspended organic substance based on their spectral absorption

Коновалов, Б. В.; Кравчишина, М. Д.; Belyaev, N. A.; Novigatsky, А. N.

doi:10.1134/s0001437014040067

Cited by 23 publications

(8 citation statements)

References 1 publication

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“…TSM concentrations were determined gravimetrically by weight following the drying of filtered samples of known volume on pre-dried and weighed GF/F filters (pore size 0.7 μm), wherein the organic and mineral suspended matter concentrations were obtained by their spectral absorption in accordance with the procedure described in [46].…”

Section: Water Samplementioning

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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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: Water Samplementioning

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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“…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), and Zavialov et al (2018). Along with the lidar measurements, water samples were collected at all stations and analyzed for concentrations of suspended matter and chlorophyll through the procedures described by Konovalov et al (2014). The pigment carotenoid-chlorophyll index (CCI) showing essentially the "age" or the life stage of the phytoplankton was also determined photometrically in the laboratory as the ratio of optical densities of pigments extracted from the samples at 430 and 665 nm wavelengths (e.g., Margalef, 1967;Wozniak and Dera, 2007).…”

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

Zavialov

Izhitskiy

Kirillin

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. This article reports the results of three field campaigns conducted in Lake Issyk-Kul in 2015, 2016, and 2017. During the campaigns, CTD profiling and water sampling were performed at 34 locations all over the lake. A total of 75 CTD profiles were obtained. 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 three mooring stations in the eastern littoral region of the lake, yielding 147-day-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 a 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 a depth of 70–120 m, from where salinity slightly decreased downwards. The data from the moored thermistor chains support the previously published hypothesis about the 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 we substantiate this hypothesis by estimates based on simple model assumptions.

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“…The inset table in the upper part of the figure refers to the LiDAR measurements encompassing total of 169,166 data points distributed all over the lake along the ship's tracks, whilst 285 the bullets in the plot depict data from water samples collected at the stations. The samples were analyzed in laboratory and the concentrations were determined through the procedures described by Konovalov et al (2014). Also shown in Fig.…”

Section: Chlorophyll-"a" and Total Suspended Mattermentioning

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.

show abstract

Determination of the concentration of mineral particles and suspended organic substance based on their spectral absorption

Cited by 23 publications

References 1 publication

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

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

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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