Spatiotemporal drivers of dissolved organic matter in high alpine lakes: Role of Saharan dust inputs and bacterial activity

Mladenov, Natalie; Pulido-Villena, Elvira; Morales‐Baquero, Rafael; Ortega-Retuerta, E.; Sommaruga, Rubén; Reche, Isabel

doi:10.1029/2008jg000699

Cited by 33 publications

(37 citation statements)

References 42 publications

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“…Despite the differences observed in the baseline DOC concentrations in the study reservoirs, the relationships between DOC and atmospheric WSOC inputs (Fig. 5) showed similar slopes between them (from 0.08±0.03 in Quéntar to 0.14±0.05 in Cubillas) and were similar to that one reported previously by Mladenov et al (2008). Despite these clear synchronies, the direct (quantitative) contribution of WSOC inputs to the DOC pool in the reservoirs was very moderate (lower than 10 %) producing long residence times (DOC stock/WSOC atmospheric inputs) of the atmospheric inputs in the reservoir that ranged from 4.6 to 10.4 yr (Table 6).…”

Section: Direct Effects Of Wsoc Deposition On the Reservoir Doc And Cdomsupporting

confidence: 72%

“…The low DOC concentration in Quéntar and the high ratio of reservoir area to mixing depth in Cubillas make these two reservoirs particularly responsive to atmospheric dust inputs. Similarly, Mladenov et al (2008) found that the relationship between the lake DOC and the atmospheric WSOC inputs was only significant in the most oligotrophic high mountain lake. Despite the differences observed in the baseline DOC concentrations in the study reservoirs, the relationships between DOC and atmospheric WSOC inputs (Fig.…”

Section: Direct Effects Of Wsoc Deposition On the Reservoir Doc And Cdommentioning

confidence: 99%

“…Therefore, a stimulus of bacterioplankton by dust inputs may also produce more CDOM. Indeed, Mladenov et al (2008Mladenov et al ( , 2011 found that dust and bacteria are the major factors controlling the optical properties of dissolved organic matter in oligotrophic high mountain lakes.…”

Section: Indirect Effects Of Dust Deposition On Reservoir Doc and Cdommentioning

confidence: 99%

“…DOC and CDOM dynamics in aquatic ecosystems depend on the relative influence of their inherent properties such as the morphometry, photosynthetic productivity, or microbial C processing, as well as external factors such as the catchment area, the soil type, or the environmental conditions that determine the allochthonous C inputs (Tipping et al, 1988;Curtis, 1998;Reche et al, 2000;Pace and Cole, 2002;Reche and Pace, 2002;Mladenov et al, 2008). Although the external factors controlling DOC in lakes are well documented in diverse geographical regions (Xenopoulos et al, 2003;Sobek et al, 2007), scarce information exists for the reservoirs, which assume a major role of the run-off inputs.…”

Section: De Vicente Et Al: Contribution Of Dust Inputs To Dissolvmentioning

confidence: 99%

“…If the rain volume was < 1000 mL, it was brought up to that volume with Milli-Q ultrapure water. Dry and wet deposition buckets were collected every week during the stratification periods (March-September) of 2004 and 2005. Water-soluble organic carbon (WSOC) refers to the organic C from atmospheric deposition that is soluble in water and is measured as DOC (Yang et al, 2003;Mladenov et al, 2008). The concentrations of WSOC (mmol m −2 d −1 ) in the dry and wet deposition collected each week were converted to units of daily deposition using the following equation:…”

Section: Atmospheric Deposition Samplingmentioning

confidence: 99%

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Contribution of dust inputs to dissolved organic carbon and water transparency in Mediterranean reservoirs

et al. 2012

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Abstract. The Mediterranean reservoirs receive frequent atmospheric Saharan dust inputs with soil-derived organic components mostly during the stratification periods, when run-off inputs are particularly limited. Here, we quantified and optically characterized the water-soluble organic carbon (WSOC) of the (dry and wet) atmospheric deposition in collectors placed near three reservoirs from the western Mediterranean Basin. In addition, we determined the WSOC contribution to the pool of dissolved organic carbon (DOC) in the reservoirs and the influence of dust-derived chromophoric organic components on the water transparency during their stratification periods.We found synchronous dynamics in the WSOC atmospheric inputs among the three collectors and in the DOC concentrations among the three reservoirs. The DOC concentrations and the WSOC atmospheric inputs were positive and significantly correlated in the most oligotrophic reservoir (Quéntar) and in the reservoir with the highest ratio of surface area to mixing water depth (Cubillas). Despite these correlations, WSOC atmospheric inputs represented less than 10% of the total DOC pool, suggesting that indirect effects of dust inputs on reservoir DOC may also promote these synchronous patterns observed in the reservoirs. Chromophoric components from dust inputs can significantly reduce the water transparency to the ultraviolet radiation (UVR). The depths where UVR at λ = 320 nm was reduced to ten percent of surface intensity (Z 10 % ) decreased 27 cm in Béznar, 49 cm in Cubillas, and 69 cm in Quéntar due to the dust inputs. Therefore, the increasing dust export to the atmosphere may have consequences for the water transparency of aquatic ecosystems located under the influence of the global dust belt.

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Section: Direct Effects Of Wsoc Deposition On the Reservoir Doc And Cdomsupporting

confidence: 72%

Section: Direct Effects Of Wsoc Deposition On the Reservoir Doc And Cdommentioning

confidence: 99%

Section: Indirect Effects Of Dust Deposition On Reservoir Doc and Cdommentioning

confidence: 99%

Section: De Vicente Et Al: Contribution Of Dust Inputs To Dissolvmentioning

confidence: 99%

Section: Atmospheric Deposition Samplingmentioning

confidence: 99%

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Contribution of dust inputs to dissolved organic carbon and water transparency in Mediterranean reservoirs

et al. 2012

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Soluble ferrous iron (Fe (II)) enrichment in airborne dust

Bhattachan

Reche

D’Odorico

2016

J. Geophys. Res. Atmos.

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The input of soluble iron in dust delivered to the ocean and lakes is critical to their biogeochemistry and phytoplankton productivity. Most iron in soils and sediment deposits is insoluble, while only a tiny fraction is soluble and therefore suitable to meet the phytoplankton's requirements for photosynthesis and nitrogen assimilation. Aerosol deposition constitutes a major source of soluble iron to oceans and lakes, and in some regions the low phytoplankton productivity has been related to limitations in the supply of soluble iron from terrestrial sources. It is suggested that during atmospheric transport part of the insoluble iron is converted into soluble form. While the understanding of increased bioavailability of iron during atmospheric transport is improving, there are only a limited number of studies that actually quantify the increase in iron bioavailability in dust. In this study we compare the soluble ferrous iron, Fe (II) content in dust collected at deposition sites in the high‐altitude mountains of the Sierra Nevada, Spain, to the source of dust in North Africa. We found that the dust is greatly enriched (on average 15 times) in Fe (II) relative to the fine fraction (<45 µm) of the parent soil collected from North African dust sources.

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Climate‐induced hydrological variation controls the transformation of dissolved organic matter in a subalpine lake

Ejarque

Khan

Steniczka

et al. 2018

Limnology & Oceanography

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Lakes are an inherent component of the global carbon cycle. They receive dissolved organic matter (DOM) from the catchment, which is stored, transformed and respired, or delivered downstream. In this study, we show that a subalpine lake shifts its role from DOM “transporter” to “transformer” depending on season and climate. We monitored dissolved organic carbon (DOC) concentration and DOM optical properties at the inlet and outlet of subalpine Lake Lunz (Austria) at high frequency during two contrasting years: an extreme drought in 2015, and regular precipitation regime in 2016. During both years, the DOC mass balance revealed that inflowing and outflowing DOC loads were nearly balanced (+6.57% and +1.70% DOC production in 2015 and 2016, respectively). However, DOM optical properties revealed an in‐lake turnover of DOM compounds, so that the terrestrial and aromatic signature of inflowing DOM was modified into autochthonous, protein‐like DOM. The magnitude of this transformation varied seasonally, being maximal in summer and minimal in winter, presumably following periods of high and low primary production and photo‐degradation. Inter‐annually, we found that drought further increased DOM transformation during summer by extending the lake water residence time. Finally, our results demonstrate a rapid response of DOM dynamics to hydrological and meteorological changes at both seasonal and inter‐annual scales, suggesting that carbon cycling in clear‐water mountain lakes may be highly sensitive to hydrological variation.

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Spatiotemporal drivers of dissolved organic matter in high alpine lakes: Role of Saharan dust inputs and bacterial activity

Cited by 33 publications

References 42 publications

Contribution of dust inputs to dissolved organic carbon and water transparency in Mediterranean reservoirs

Contribution of dust inputs to dissolved organic carbon and water transparency in Mediterranean reservoirs

Soluble ferrous iron (Fe (II)) enrichment in airborne dust

Climate‐induced hydrological variation controls the transformation of dissolved organic matter in a subalpine lake

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