Remote Sensing Observation of Particulate Organic Carbon in the Pearl River Estuary

Liu, Dong; Pan, Delu; Bai, Yan; He, Xianqiang; Wang, Difeng; Wei, Jian; Zhang, Lin

doi:10.3390/rs70708683

Cited by 45 publications

(16 citation statements)

References 41 publications

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“…Imagery from the moderate resolution imaging spectroradiometer (MODIS) was used in the present study, and has been used previously in several other coastal-water studies (Bierman et al 2011;Petus et al 2014a;Chaves et al 2015;Devlin et al 2015;Liu et al 2015). The MODIS sensor is aboard the polarorbiting satellite Aqua, launched in July 2002, and captures the entire earth surface every 1-2 days.…”

Section: Modis-aqua Satellite-image Productsmentioning

confidence: 99%

Have droughts and increased water extraction from the Murray River (Australia) reduced coastal ocean productivity?

Auricht

Clarke

Lewis

et al. 2018

Mar. Freshwater Res.

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Abstract. River discharges are decreasing in many regions of the world; however, the consequences of this on water quality and primary productivity of receiving coastal oceans are largely unclear. We analysed satellite remote-sensing data (MODIS) of the coastal ocean zone that receives outflows from the Murray River, from 2002 to 2016. This system has experienced historical flow reductions and a recent extreme hydrological 'Millennium' drought. Remotely sensed chlorophyll-a and particulate organic carbon in the coastal ocean were strongly correlated with river outflows (R 2 . 0.6) in an 8-km radial buffer zone from the Murray Mouth, and the river influence extended up to ,60 km from the Murray Mouth during high-flow periods. This distance was approximately three times greater than the freshwater plume extent during maximum flows in 2011, suggesting that new primary productivity was created. In contrast, there was no additional coastal ocean productivity above background levels from 2007 to 2010 when river outflows ceased. Hindcast calculations based on historical flows from 1962 to 2002 suggest that declining Murray River flows have greatly reduced primary productivity in adjacent coastal waters. This has potential consequences for higher trophic levels and should be considered in future management planning.

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Section: Modis-aqua Satellite-image Productsmentioning

confidence: 99%

Have droughts and increased water extraction from the Murray River (Australia) reduced coastal ocean productivity?

Auricht

Clarke

Lewis

et al. 2018

Mar. Freshwater Res.

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“…At each site, the distance between two adjacent sampling sites was greater than 1.5 km. The longitude and latitude coordinates for each site were obtained using a global positioning system receiver, and about 1000-1500 mL of surface water were collected from a 50 cm-water depth for the laboratory measurement of TSM [38].…”

Section: Field Data Collectionmentioning

confidence: 99%

Landsat-Based Long-Term Monitoring of Total Suspended Matter Concentration Pattern Change in the Wet Season for Dongting Lake, China

et al. 2015

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Assessing the impacts of environmental change and anthropogenic activities on the historical and current total suspended matter (TSM) pattern in Dongting Lake, China, is a large challenge. We addressed this challenge by using more than three decades of Landsat data. Based on in situ measurements, we developed an algorithm based on the near-infrared (NIR) band to estimate TSM in Dongting Lake. The algorithm was applied to Landsat images to derive TSM distribution maps from 1978 to 2013 in the wet season, revealing significant inter-annual and spatial variability. The relationship of TSM to water level, precipitation, and wind speed was analyzed, and we found that: (1) sand mining areas usually coincide with regions that have high TSM levels in Dongting Lake; (2) water level and seven-day precipitation were both important to TSM variation, but no significant relationship was found between TSM and wind speed or other meteorological data; (3) the increased level of sand mining in response to rapid economic growth has deeply influenced the TSM pattern since 2000 due to the resuspension of sediment; and (4) TSM variation might OPEN ACCESSRemote Sens. 2015, 7 13976 be associated with policy changes regarding the management of sand mining; it might also be affected by lower water levels caused by the impoundment of the Three Gorges Dam since 2000.

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“…In particular, sedimentary OC of the East River tributary received large inputs from riverbank soils, phytoplankton, and agricultural C3 plants in winter but switched to riverbank and mangrove soil inputs in summer [ Fu et al ., ]. Remote sensing techniques and numerical model simulations have also been used in the Pearl River estuary and have observed seasonal and spatial variation in the particulate OC composition, which may be related to enhanced nutrient inputs, water circulation, and changing winds [ Liu et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Sources and compositional distribution of organic carbon in surface sediments from the lower Pearl River to the coastal South China Sea

Zhang

Wade

et al. 2017

JGR Biogeosciences

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The Pearl River plays an important role in transporting terrestrial organic carbon (OC) to the South China Sea (SCS). However, the sources and compositional distribution of OC in the system are poorly understood. This study focused on delineating the sources and determining the fate of surface sedimentary OC from the Feilaixia Hydropower Station to the coastal SCS. Elemental, stable carbon/nitrogen isotope (δ13C and δ15N), and lignin‐phenol analyses have been conducted. The total OC (TOC) from the upstream sites were generally derived from vascular plants (higher C/N and and depleted δ13C) and soils. Additional input was attributed to riverine primary production (lower C/N and enriched δ13C), which was enhanced near the dam‐created reservoir. The C/N and δ13C values were not significantly different among sites in the midstream. The estuary/coastal sites witnessed hydrodynamically sorted riverine OC, which was diluted by marine primary production (lower C/N and more enriched δ13C). The lignin concentration was the highest in the upstream sites, remained relatively unchanged in the midstream sites, and decreased significantly along the estuary/coastal sites, which was corroborated by variation in TOC. A comprehensive five‐end‐member Monte Carlo simulation suggested that previous studies had underestimated the C4 plant input by 14 ± 11% and overestimated the riverbank soil input by 21 ± 17%. Thus, our study provided valuable information for more accurate source and mass balance studies of terrestrial OC transported to the SCS, which helped to further understand the carbon cycling in the large river‐ocean continuum.

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Remote Sensing Observation of Particulate Organic Carbon in the Pearl River Estuary

Cited by 45 publications

References 41 publications

Have droughts and increased water extraction from the Murray River (Australia) reduced coastal ocean productivity?

Have droughts and increased water extraction from the Murray River (Australia) reduced coastal ocean productivity?

Landsat-Based Long-Term Monitoring of Total Suspended Matter Concentration Pattern Change in the Wet Season for Dongting Lake, China

Sources and compositional distribution of organic carbon in surface sediments from the lower Pearl River to the coastal South China Sea

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