Shift from nival to pluvial recharge of an aquifer-fed lake increases water temperature

Flaim, Giovanna; Nishri, A.; Camin, Federica; Corradini, Stefano; Obertegger, Ulrike

doi:10.1080/20442041.2019.1582958

Cited by 8 publications

(21 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This clustering was linked to higher water transparency, conductivity and temperature and lower DO, rain and pH during the latter 2 years. In A35, the December sampling of hydro‐year V was an outlier with respect to the other samples of hydro‐years IV and V because of marked autumn mixing that led to a rapid cooling of the entire lake as shown in Flaim et al ().…”

Section: Resultsmentioning

confidence: 97%

“…The timing of snowmelt events was different among years and sites (Table ) because of weather differences and because water from the under‐ground springs first fills up the shallow basin and then flows into the deep basin. Depending on the amount of snow (Flaim et al, ), a hydrological year can be longer or shorter than a calendar year. For simplicity, we refer to hydrological years I–V as hydro‐years I–V.…”

Section: Methodsmentioning

confidence: 99%

“…Climate change is affecting lakes worldwide (O'Reilly et al, ), and mountain lakes are particularly vulnerable (Flaim, Nishri, Camin, Corradini, & Obertegger, ; Sadro, Melack, Sickman, & Skeen, ). Their importance is far reaching as they provide important ecosystem services beyond their immediate catchment (Beniston et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…This cold‐water montane lake shows steep temperature gradients in its basins (Cellamare et al, ), making it particularly vulnerable to changes in its thermal structure. Flaim et al () show how altered precipitation patterns led to a substantial temperature increase in Lake Tovel. Changes in microbial community composition can indicate marked ecosystem transitions (Thaler, Vincent, Lionard, Hamilton, & Lovejoy, ), and assessing the temporal synchrony of communities can serve as an indicator of environmental stability (Vasseur & Fox, ).…”

Section: Introductionmentioning

confidence: 99%

“…We investigated (a) whether shifts in prokaryote and protist communities reflected an ecosystem change, (b) whether shifts occurred at the same time and to the same extent in the three habitats and (c) whether the temporal patterns of microbes could be related to environmental variables. We also tested the concept of hydrological year sensu Flaim et al () for its explanatory power of the interpretation of temporal patterns. Generally, the concept of time is linked to a fixed calendar year of 365 days.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Multifaceted aspects of synchrony between freshwater prokaryotes and protists

2019

Self Cite

View full text Add to dashboard Cite

Community composition of freshwater prokaryotes and protists varies through time. Few studies contemporarily investigate temporal variation of these freshwater communities for more than 1 year. We compared the temporal patterns of prokaryotes and protists in three distinct habitats for 4 years (2014–2017) in Lake Tovel, a cold‐water lake. This lake showed a marked temperature increase in 2017 linked to altered precipitation patterns. We investigated whether microbial communities reflected this change across habitats and whether changes occurred at the same time and to the same extent. Furthermore, we tested the concept of hydrological year emphasizing the ecological effect of water renewal on communities for its explanatory power of community changes. Microbe diversity was assessed by Illumina sequencing of the V3–V4 hypervariable region of the 16S rRNA gene and 18S rRNA gene, and we applied co‐inertia analysis and asymmetric eigenvector maps modelling to infer synchrony and temporal patterns of prokaryotes and protists. When considering community composition, microbes were invariable in synchrony across habitats and indicated a temporal gradient linked to decreasing precipitation; however, when looking at temporal patterns, the extent of synchrony was reduced. Small‐scale patterns were similar across habitats and microbes and linked to seasonally varying environmental variables, while large‐scale patterns were different and partially linked to an ecosystem change as indicated by increasing water transparency and temperature and decreasing dissolved oxygen. Our advanced statistical approach outlined the multifaceted aspect of synchrony when linked to community composition and temporal patterns.

show abstract

Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multifaceted aspects of synchrony between freshwater prokaryotes and protists

2019

Self Cite

View full text Add to dashboard Cite

show abstract

Decadal changes in surface CO₂ concentrations and CO₂ fluxes in a mountain lake

Obertegger,

Corradini,

Cerasino

et al. 2024

Limnology & Oceanography

Self Cite

View full text Add to dashboard Cite

Climate warming impacts biogeochemical cycles in lakes. However, the factors controlling CO2 dynamics in mountain lakes over multidecadal scales are poorly understood. Here, we capitalized on long‐term monthly data (1995–2022) of oligotrophic mountain Lake Tovel and calculated surface CO2 concentrations and flux by applying geochemical relationships and the thin boundary layer approach. Advanced time‐series and regression modeling was used to determine temporal patterns and environmental parameters explaining surface CO2 concentrations and flux. Surface CO2 concentrations were highest from 2009 to 2017 (annual mean: 109.1 μmol CO2 L−1) but lower before and after this period. Concomitantly, the air–water CO2 flux (μmol CO2 m−2 d−1) showed a period of lowest (mean1995–2010: 6.4 ± 0.7), highest (mean2011–2017: 35.7 ± 2.1), and intermediate emissions (mean2018–2022: 19.3 ± 4.7). Temporal modeling showed that hypolimnetic and deep hypolimnetic dissolved oxygen (DO) had the same change points and trends as surface CO2 concentrations. In multiple linear regression, hypolimnetic DO, silica, and the standardized precipitation index (pseudo‐R2adj. = 0.62; p < 0.01) best predicted annual mean surface CO2 concentrations. Regression results and the overlap between temporal trend patterns indicated that surface CO2 concentrations of Lake Tovel were positively influenced by external (loading of allochthonous carbon) and internal (lake autumn mixing) factors. The recent decline in surface CO2 concentrations from the year 2018 was attributed to increased stratification that offset lake autumn mixing and thus lead to the observed decline. These results help us to better understand the carbon cycle in mountain lakes in a changing climate.

show abstract

Snowpack determines relative importance of climate factors driving summer lake warming

Smits

MacIntyre

Sadro

2020

Limnol Oceanogr Letters

View full text Add to dashboard Cite

Lake thermal regimes are frequently decoupled from rising air temperature trends in their watersheds because interactions among climate factors and local features affect net heat gain or loss. Although snowpack has been empirically linked to temperature and warming rates in mountain lakes, the mechanisms governing this relationship remain unclear and untested, despite predicted declines in mountain snow across the world. We quantified how snowpack and ice cover regulate lake warming in summer primarily by controlling when and how long lakes receive solar radiation, and we demonstrate the relative role of snowmelt on the lake heat budget. We contrast lake thermal responses between extremely wet and dry years and illustrate the increasing importance of other climate factors in the absence of snow. AbstractMountain lakes experience extreme interannual climate variation as well as rapidly warming air temperatures, making them ideal systems to understand lake-climate responses. Snowpack and water temperature are highly correlated in mountain lakes, but we lack a complete understanding of underlying mechanisms. Motivated by predicted declines in snowfall with future temperature increases, we investigated how surface heat fluxes and lake warming responded to variation in snowpack, ice-off, and summer weather patterns in a high elevation lake in the Sierra Nevada, California. Ice-off timing determined the phenology of lake exposure to solar radiation, and was the dominant mechanism linking snowpack to lake temperature. The relative importance of heat loss fluxes (longwave radiation, latent and sensible heat exchange) varied among wet and dry years. Declines in snowpack and ice cover in mountain systems will reduce variability in lake thermal responses and increase the responsiveness of lake warming to atmospheric forcing.

show abstract

Shift from nival to pluvial recharge of an aquifer-fed lake increases water temperature

Cited by 8 publications

References 59 publications

Multifaceted aspects of synchrony between freshwater prokaryotes and protists

Multifaceted aspects of synchrony between freshwater prokaryotes and protists

Decadal changes in surface CO₂ concentrations and CO₂ fluxes in a mountain lake

Snowpack determines relative importance of climate factors driving summer lake warming

Contact Info

Product

Resources

About

Shift from nival to pluvial recharge of an aquifer-fed lake increases water temperature

Cited by 8 publications

References 59 publications

Multifaceted aspects of synchrony between freshwater prokaryotes and protists

Multifaceted aspects of synchrony between freshwater prokaryotes and protists

Decadal changes in surface CO2 concentrations and CO2 fluxes in a mountain lake

Snowpack determines relative importance of climate factors driving summer lake warming

Contact Info

Product

Resources

About

Decadal changes in surface CO₂ concentrations and CO₂ fluxes in a mountain lake