Methane and carbon dioxide cycles in lakes of the King George Island, maritime Antarctica

Thalasso, Frédéric; Sepulveda‐Jauregui, Armando; Cabrol, Léa; Lavergne, Céline; Olgun, Nazlı; Martinez‐Cruz, Karla; Aguilar-Muñoz, Polette; Calle, Natalia; Mansilla, Andrés; Astorga-España, Maria Soledad

doi:10.1016/j.scitotenv.2022.157485

Cited by 7 publications

(4 citation statements)

References 59 publications

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“…This is supported by the significant negative correlation between CO 2 emission and Chl-a. The mean Chl-a concentrations of this study were much higher than those in other rivers and lakes, and the significant negative correlation between CO 2 emission and Chl-a both indicated that the impact of primary production on CO 2 emission should be considered in this study [27,54,61]. Xu et al (2018) reported that DIC in a river-lake continuum originated from 13 C-depleted sources with a mean δ 13 C-DIC value of −18.5‰ [62].…”

Section: Control Processes On Co 2 and Ch 4 Emissionsmentioning

confidence: 62%

Interconnected River–Lake Project Decreased CO2 and CH4 Emission from Urban Rivers

Wang,

Xv,

et al. 2023

Water

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Urban riverine networks are hotspots of CO2 and CH4 emissions, due to river impoundment and pollution. The river–lake connection is considered to be an important way to improve the ecological environment of urban rivers; however, its impact on CO2 and CH4 emissions from urban rivers and regulatory mechanisms are still unclear. Rivers and lakes have been studied separately by lots of traditional studies. In this study, we investigated the concentration and emission of CO2 and CH4 from March 2021 to December 2021 in an interconnected river–lake system in Central China. We found that the urban river–lake system was a hotspot of CO2 and CH4 emissions. CO2 and CH4 emissions from urban rivers were much higher than those from the lakes, which are 2.7 times and 11.9 times that of lakes, respectively. The correlation analysis indicated that the spatial variation of CO2 and CH4 emissions was determined by nutrient content. The abundant nutrients promoted microbial growth and consumed dissolved oxygen (DO), thus resulting in high emissions of CO2 and CH4 in the isolated urban rivers (UR). The average CO2 and CH4 emissions of urban rivers are 991.56 and 14.82 mmol m−2 d−1, respectively. The river–lake connection decreased the nutrients of urban rivers connected to lakes (LUR). The moderate nutrients wreaked in situ respiration, exhibiting moderate CO2 emission in the LUR. The average CO2 emission of LUR is 543.49 mmol m−2 d−1. The river–lake connection increased the DO concentrations in the LUR, inhibited methanogenesis, and enhanced CH4 oxidation, reducing CH4 emission from LUR sharply. The average CH4 emission of LUR is 1.26 mmol m−2 d−1. A correlation analysis showed that the seasonal variations of CO2 and CH4 emissions were controlled by DO and T. Hence, the highest emissions of CO2 were observed in the spring and the lowest in the winter, and the CO2 emissions in spring were 10.7 times that in winter. The highest emissions of CH4 were observed in the summer and the lowest in the winter, and the CH4 emissions in summer were 6.6 times those in winter. The connection of urban rivers and lakes changes the environmental factors, thereby varying the production and emission of greenhouse gases. This study advanced the knowledge of the greenhouse gas emission response to the river–lake connection, providing the theoretical basis for greenhouse gas emission reduction from urban rivers.

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Section: Control Processes On Co 2 and Ch 4 Emissionsmentioning

confidence: 62%

Interconnected River–Lake Project Decreased CO2 and CH4 Emission from Urban Rivers

Wang,

Xv,

et al. 2023

Water

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“…In addition, higher CO 2 concentrations also increased algal photosynthesis to increase phytoplankton biomass accumulation [85][86][87]. A portion of the carbon dioxide present in the lake was dissolved in the water, changing the pH of the water and having an effect on the nutrientcycling process, with the water becoming less hard and the concentration of calcium ions decreasing [88]. The growth of some acid-loving cyanobacteria in this environment was promoted [89].…”

Section: Response Mechanisms Of Lake Algal Blooms To Climate Warmingmentioning

confidence: 98%

A Review on the Driving Mechanism of the Spring Algal Bloom in Lakes Using Freezing and Thawing Processes

Zhao,

Liu,

et al. 2024

Water

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Spring algal blooms in mid–high-latitude lakes are facing serious challenges such as earlier outbreaks, longer duration, and increasing frequency under the dual pressure of climate warming and human activities, which threaten the health of freshwater ecosystems and water security. At present, the freeze-thaw processes is the key to distinguishing spring algal blooms in mid- to high-latitude lakes from low-latitude lakes. Based on the visualization and an analysis of the literature in the WOS database during 2007–2023, we clarified the driving mechanism of the freeze-thaw process (freeze-thaw, freeze-up, and thawing) on spring algal bloom in lakes by describing the evolution of the freeze-thaw processes on the nutrient migration and transformation, water temperature, lake transparency and dissolved oxygen, and physiological characteristics of algae between shallow lakes and deep lakes. We found that the complex phosphorus transformation process during the frozen period can better explain the spring-algal-bloom phenomenon compared to nitrogen. The dominant species of lake algae also undergo transformation during the freeze-thaw process. On this basis, the response mechanism of spring algal blooms in lakes to future climate change has been sorted out. The general framework of “principles analysis, model construction, simulation and prediction, assessment and management” and the prevention strategy for dealing with spring algal bloom in lakes have been proposed, for which we would like to provide scientific support and reference for the comprehensive prevention and control of spring algal bloom in lakes under the freezing and thawing processes.

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“…Данные по измерению растворенного углекислого газа и его потоков с поверхности озер показали, что все типы водных объектов п-ова Файлдс, как правило, характеризуются поглощением углекислоты из атмосферы, независимо от их размера и температурного режима. Полученные нами данные согласуются с ранее опубликованными в работе [22] для оз. Китеж.…”

Section: дискуссияunclassified

“…В [21] авторы рассматривали активность и биоразнообразие аэробных метанотрофов в донных отложениях пяти озер о. Кинг Джордж. В работе [22] рассмотрено содержание растворенных парниковых газов в воде, донных отложениях озера Китеж в течение года, эмиссия СО 2 и СН 4 с его поверхности в летний период. Для Китежа представлены пространственное распределение СО 2 и СН 4 по глубине озера, а также эмиссия газов с его поверхности, где отмечается поглощение СО 2 и выделение СН 4 в конце весеннего периода и начале осеннего.…”

Section: Introductionunclassified

Adaptation of Fildes Peninsula Lakes (King George Island, East Antarctica) to climate change and anthropogenic impacts

Fedorova,

Chernova,

Evgrafova

et al. 2024

Problemy Arktiki i Antarktiki

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The load on the Antarctic oases has been recently increasing, with intensive research carried out by various countries and ecological tourism developing. This leads to an increase in the impact on the aquatic ecosystems of the lakes and streams in addition to the warming climate and glacier melting. This paper presents findings from a study of the Fildes Peninsula (King George Island) lakes’ aquatic ecosystems in the summer period of January–February 2020. In addition to results of hydrological and hydrochemical studies, the paper provides data from measurements of the self-cleaning ability of representative oasis lakes, as well as greenhouse gas fluxes from the lakes surface. The water level of the streams decreased 5 times over the summer season, and the water discharge — 10 times. The streams flowing from the glacier have the fullest water. The lakes have a neutral reaction, sometimes weakly alkaline; they are well aerated: the average value of dissolved oxygen in water is 85 %, occasionally supersaturation of up to 137% was observed. The concentration of nutrients in the water has amplitudes that are considerable for Antarctic oases lakes. A significant correlation can only be observed between nitrates and phosphates, and also between the water turbidity and the nutrients’ concentration. Maximum turbidity is observed in lakes with abundant content of bacterial mats. Most of the lakes have hydrochemical type II sodium chloride waters. The assessment of the lake self-cleaning ability using the ratio of destruction and organic matter production showed the general ability of ecosystems to cope with external (natural) pressures on ecosystems, but not in all cases. Eutrophication of the lakes and stream valleys is also noted. Carbon dioxide (CO2) absorption was observed in most of the streams and lakes, in some of them — methane (CH4) absorption as well. However, CH4 is generally emitted from the surface of the lakes. The largest values are recorded for small lakes located on glacial moraines and in places where ornithosoils are present. The agreement of the findings from the hydroecological studies of the Fildes peninsula lakes with those presented earlier by other authors makes it possible to conclude that there is a certain resistance of the lakes to climatic changes, but one can already talk about a significant anthropogenic impact on the freshwater oasis ecosystems.

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Methane and carbon dioxide cycles in lakes of the King George Island, maritime Antarctica

Cited by 7 publications

References 59 publications

Interconnected River–Lake Project Decreased CO2 and CH4 Emission from Urban Rivers

Interconnected River–Lake Project Decreased CO2 and CH4 Emission from Urban Rivers

A Review on the Driving Mechanism of the Spring Algal Bloom in Lakes Using Freezing and Thawing Processes

Adaptation of Fildes Peninsula Lakes (King George Island, East Antarctica) to climate change and anthropogenic impacts

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