Seasonal nutrient chemistry in mountainous river systems of tropical Western Peninsular India

Pradhan, U.K.; Wu, Ying; Shirodkar, P.V.; Zhang, Jing

doi:10.1080/02757540.2014.961438

Cited by 12 publications

(6 citation statements)

References 42 publications

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“…However, unlike NO 3 − , NH 4 + did not show any mid-stream maximum (Figure 6B), which could be due to the high nitrification rate in the estuary (Pratihary et al, unpublished data). The NO 3 − concentration during 2020 (especially toward the upstream, 2.5µM) was lower compared to earlier observations of May 2015, SIM of 2012 (Pradhan et al, 2015), SIM of 1981(De Sousa, 1983, and this decrease was statistically significant (p < 0.05). We attribute this low NO 3 − concentration to the reduced run-off from mining industries during the lockdown period.…”

Section: Resultscontrasting

confidence: 61%

“…The nutrient concentration in the Mandovi Estuary during May 2020 was compared with earlier measurements (May 2015, De Sousa, 1983Pradhan et al, 2015, during Sousa (1983) and Pradhan et al (2015) during SIM. Although during SIM the variation of PO 4 3− and SiO 4 4− from mouth to upstream show a regular trend reflecting their conservative mixing behavior (De Sousa, 1983;Upadhyay and Gupta, 1995), the same is not true for NO 3 − which shows a prominent mid-stream maximum reaching up to 6.…”

Section: Resultsmentioning

confidence: 89%

“…This is consistent with our in-situ measurements (Figure 2), which suggest the influence of anthropogenic activities on CDOM absorption in the mid-stream region of the Mandovi Estuary, and the effect was observed to be minimal during the lockdown of 2020. (Pradhan et al, 2015) and 1981(De Sousa, 1983.…”

Section: Resultsmentioning

confidence: 99%

“…Although during SIM the variation of PO 4 3− and SiO 4 4− from mouth to upstream show a regular trend reflecting their conservative mixing behavior (De Sousa, 1983;Upadhyay and Gupta, 1995), the same is not true for NO 3 − which shows a prominent mid-stream maximum reaching up to 6. 5-11 µM (De Sousa, 1983;Pradhan et al, 2015;Figure 6A). During SIM, NO 3 − increases non-linearly (with salinity) just after station 4, with maximum concentration in the mid-stream-upstream region, and then decreases further upstream (De Sousa, 1983).…”

Section: Resultsmentioning

confidence: 99%

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Variations of Colored Dissolved Organic Matter in the Mandovi Estuary, Goa, During Spring Inter-Monsoon: A Comparison With COVID-19 Outbreak Imposed Lockdown Period

et al. 2021

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Colored dissolved organic matter (CDOM) is one of the important fractions of dissolved organic matter (DOM) that controls the availability of light in water and plays a crucial role in the cycling of carbon. High CDOM absorption in the Mandovi Estuary (Goa) during spring inter-monsoon (SIM) is largely driven by both in-situ production and anthropogenic activities. Here we have presented the CDOM variation in the estuary during SIM of 2014–2018 and compared it with that of 2020 when the COVID-19 outbreak imposed lockdown was implemented. During 2020, low CDOM absorption was observed at the mid-stream of the estuary as compared to the previous years, which could be attributed to low autochthonous production and less input from anthropogenic activities. On the other hand, high CDOM observed at the mouth during 2020 is linked to autochthonous production, as seen from the high concentrations of chlorophyll a. High CDOM in the upstream region could be due to both autochthonous production and terrestrially derived organic matter. Sentinel-2 satellite data was also used to look at the variations of CDOM in the study region which is consistent with in-situ observations. Apart from this, the concentration of nutrients (NO3–, NH4+, and SiO44–) in 2020 was also low compared to the previous reports. Hence, our study clearly showed the impact of anthropogenic activities on CDOM build-up and nutrients, as the COVID-19 imposed lockdown drastically controlled such activities in the estuary.

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Section: Resultscontrasting

confidence: 61%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Variations of Colored Dissolved Organic Matter in the Mandovi Estuary, Goa, During Spring Inter-Monsoon: A Comparison With COVID-19 Outbreak Imposed Lockdown Period

et al. 2021

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“…In general, anthropogenic changes are first reflected in the chemistry of streams in small headwater catchments. Such streams have a greater contribution in catchments compared with larger rivers; therefore, they may experience greater chemical inputs, shorter response times, and more effective processing and transporting of elements compared to larger rivers [12,13]. Thus, the effects of various human activities on water chemistry can more easily be identified in small catchments than in larger basins with complex disturbance regimes or geology.…”

Section: Introductionmentioning

confidence: 99%

Response of Water Chemistry to Long-Term Human Activities in the Nested Catchments System of Subtropical Northeast India

Prokop

Wiejaczka

Syiemlieh

et al. 2019

Water

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The subtropics within the monsoonal range are distinguished by intensive human activity, which affects stream water chemistry. This paper aims to determine spatio-temporal variations and flowpaths of stream water chemical elements in a long-term anthropogenically-modified landscape, as well as to verify whether the water chemistry of a subtropical elevated shield has distinct features compared to other headwater areas in the tropics. It was hypothesized that small catchments with homogenous environmental conditions could assist in investigating the changes in ions and trace metals in various populations and land uses. Numerous physico-chemical parameters were measured, including temperature, pH, electrical conductivity (EC), dissolved organic carbon (DOC), major ions, and trace metals. Chemical element concentrations were found to be low, with a total dissolved load (TDS) below 52 mg L−1. Statistical tests indicated an increase with significant differences in the chemical element concentration between sites and seasons along with increases of anthropogenic impact. Human influence was clearly visible in the case of cations (Ca2+, K+, Mg2+, Na+) and anions (Cl−, HCO3−, NO3−, SO42−), compared to trace metals. The order of most abundant metals Fe > Zn > Al > Sr was the same in springs and streams, regardless of population density, land use, and season. Principal component analysis (PCA) demonstrated that major ion concentrations in stream water followed the pattern forest < cultivated land < grassland < built-up area. Surface water chemistry of the subtropical elevated shield has mixed features of tropical and temperate zones. Low concentrations of chemical elements; small seasonal differences in headwater streams; and increased concentrations of NO3−, SO42−, DOC, and Zn in the wet monsoon season are similar to those observed in the tropics. The role of long-term cultivation without chemical fertilizers in ions supply to streams is less than in other headwater areas of the tropical zone. Strong control of water chemistry in densely populated built-up areas is analogous to both tropical and temperate regions. Population density or a built-up area may be used as a proxy for the reconstruction or prediction of the anthropogenic impact on stream water chemistry in similar subtropical elevated shields.

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Distribution Characteristics and Driving Factors of Chlorophyll a and Pollutants in the Liugu Estuary

Feng,

Li,

Huang

et al. 2024

Water Air Soil Pollut

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Seasonal nutrient chemistry in mountainous river systems of tropical Western Peninsular India

Cited by 12 publications

References 42 publications

Variations of Colored Dissolved Organic Matter in the Mandovi Estuary, Goa, During Spring Inter-Monsoon: A Comparison With COVID-19 Outbreak Imposed Lockdown Period

Variations of Colored Dissolved Organic Matter in the Mandovi Estuary, Goa, During Spring Inter-Monsoon: A Comparison With COVID-19 Outbreak Imposed Lockdown Period

Response of Water Chemistry to Long-Term Human Activities in the Nested Catchments System of Subtropical Northeast India

Distribution Characteristics and Driving Factors of Chlorophyll a and Pollutants in the Liugu Estuary

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