Climate change and agricultural pollution effects on the trophic status of a Mediterranean lake

Abstract Maintaining food production while reducing agricultural pollution is a grand challenge under the threats of global climate change, which has exerted negative impacts on agricultural sustainability. How agricultural nitrogen use and loss respond to climate change is rarely understood. Here we show that climate change leads to inequality of cropland nitrogen use and loss across global regions based on historical data for the period 1961-2018 from 143 countries. Increases of yield, nitrogen surplus and nitrogen use efficiency (NUE) are identified in 30% of countries, while reductions are observed for the remaining 70% of countries, as a result of climate change. Farm size changes further intensify the inequality of nitrogen use and pollution in global croplands. Yet, enlarging farm size can facilitate climate change adaptation, by which global cropland NUE could be increased by one-third in 2100 compared to 2018 under future shared socioeconomic pathways. Our results would be of great significance to sustain global agriculture as well as eliminate national inequalities on food production and agricultural pollution control.

Download Full-text

What are the best combinations of fuel-vehicle technologies to mitigate climate change and air pollution effects across the United States?

Environmental Research Letters ◽

10.1088/1748-9326/ab8a85 ◽

2020 ◽

Vol 15 (7) ◽

pp. 074046

Author(s):

Fan Tong ◽

Inês M L Azevedo

Keyword(s):

Climate Change ◽

United States ◽

Air Pollution ◽

The United States ◽

Pollution Effects ◽

Air Pollution Effects ◽

Mitigate Climate Change ◽

Vehicle Technologies

Download Full-text

Assessment of the typology and the trophic status of two Mediterranean lake ecosystems in Northwestern Greece

Water Resources ◽

10.1134/s0097807814030105 ◽

2014 ◽

Vol 41 (3) ◽

pp. 335-343 ◽

Cited By ~ 3

Author(s):

Ifigenia Kagalou ◽

Aris Psilovikos

Keyword(s):

Trophic Status ◽

Lake Ecosystems ◽

Mediterranean Lake ◽

Northwestern Greece

Download Full-text

Evaluation of the trophic status in a Mediterranean reservoir under climate change: An integrated modelling approach

Journal of Water and Climate Change ◽

10.2166/wcc.2020.247 ◽

2020 ◽

Author(s):

Carina Almeida ◽

Paulo Branco ◽

Pedro Segurado ◽

Tiago B. Ramos ◽

Teresa Ferreira ◽

...

Keyword(s):

Climate Change ◽

Nutrient Dynamics ◽

Trophic Status ◽

Integrated Modelling ◽

Phosphorus Concentration ◽

Change Scenario ◽

Climate Change Scenarios ◽

Total Phosphorus Concentration ◽

Southern Portugal ◽

Modelling Approach

Abstract This study describes an integrated modelling approach to better understand the trophic status of the Montargil reservoir (southern Portugal) under climate change scenarios. The SWAT and CE-QUAL-W2 models were applied to the basin and reservoir, respectively, for simulating water and nutrient dynamics while considering one climatic scenario and two decadal timelines (2025–2034 and 2055–2064). Model simulations showed that the dissolved oxygen concentration in the reservoir's hypolimnion is expected to decrease by 60% in both decadal timelines, while the chlorophyll-a concentration in the reservoir's epiliminion is expected to increase by 25%. The total phosphorus concentration (TP) is predicted to increase in the water column surface by 63% and in the hypolimion by 90% during the 2030 timeline. These results are even more severe during the 2060 timeline. Under this climate change scenario, the reservoir showed an eutrophic state during 70–80% of both timelines. Even considering measures that involve decreases in 30 to 35% of water use, the eutrophic state is not expected to improve.

Download Full-text

Shorter blooms expected with longer warm periods under climate change: an example from a shallow meso-eutrophic Mediterranean lake

Hydrobiologia ◽

10.1007/s10750-021-04773-w ◽

2022 ◽

Author(s):

Gary Free ◽

Mariano Bresciani ◽

Monica Pinardi ◽

Steef Peters ◽

Marnix Laanen ◽

...

Keyword(s):

Climate Change ◽

Phytoplankton Bloom ◽

Curvilinear Relationship ◽

Calcite Precipitation ◽

Chl A ◽

The North ◽

Lake Temperature ◽

Mediterranean Lake ◽

Current Scenario ◽

The North Atlantic Oscillation

AbstractSatellite data from the Climate Change Initiative (CCI) lakes project were used to examine the influence of climate on chlorophyll-a (Chl-a). Nonparametric multiplicative regression and machine learning were used to explain Chl-a concentration trend and dynamics. The main parameters of importance were seasonality, interannual variation, lake level, water temperature, the North Atlantic Oscillation, and antecedent rainfall. No evidence was found for an earlier onset of the summer phytoplankton bloom related to the earlier onset of warmer temperatures. Instead, a curvilinear relationship between Chl-a and the temperature length of season above 20°C (LOS) was found with longer periods of warmer temperature leading to blooms of shorter duration. We suggest that a longer period of warmer temperatures in the summer may result in earlier uptake of nutrients or increased calcite precipitation resulting in a shortening of the duration of phytoplankton blooms. The current scenario of increasing LOS of temperature with climate change may lead to an alteration of phytoplankton phenological cycles resulting in blooms of shorter duration in lakes where nutrients become limiting. Satellite-derived information on lake temperature and Chl-a concentration proved essential in detecting trends at appropriate resolution over time.

Download Full-text

Impacts of Air Pollution and Climate Change on Forest Ecosystems — Emerging Research Needs

The Scientific World JOURNAL ◽

10.1100/tsw.2007.52 ◽

2007 ◽

Vol 7 ◽

pp. 1-8 ◽

Cited By ~ 33

Author(s):

Elena Paoletti ◽

Andrzej Bytnerowicz ◽

Chris Andersen ◽

Algirdas Augustaitis ◽

Marco Ferretti ◽

...

Keyword(s):

Climate Change ◽

Air Pollution ◽

Forest Ecosystems ◽

Nitrogen Saturation ◽

Climatic Conditions ◽

Air Pollutant ◽

Pressure Effects ◽

Anthropogenic Pressure ◽

Pollution Effects ◽

Major Interest

Outcomes from the 22ndmeeting for Specialists in Air Pollution Effects on Forest Ecosystems “Forests under Anthropogenic Pressure Effects of Air Pollution, Climate Change and Urban Development”, September 1016, 2006, Riverside, CA, are summarized. Tropospheric or ground-level ozone (O3) is still the phytotoxic air pollutant of major interest. Challenging issues are how to make O3standards or critical levels more biologically based and at the same time practical for wide use; quantification of plant detoxification processes in flux modeling; inclusion of multiple environmental stresses in critical load determinations; new concept development for nitrogen saturation; interactions between air pollution, climate, and forest pests; effects of forest fire on air quality; the capacity of forests to sequester carbon under changing climatic conditions and coexposure to elevated levels of air pollutants; enhanced linkage between molecular biology, biochemistry, physiology, and morphological traits.

Download Full-text

Evidence of eutrophication in Arctic lakes

Arctic Science ◽

10.1139/as-2020-0033 ◽

2021 ◽

Author(s):

Paola Ayala-Borda ◽

Connie Lovejoy ◽

Michael Power ◽

Milla Rautio

Keyword(s):

Climate Change ◽

Chemical Composition ◽

Satellite Imagery ◽

Trophic Status ◽

Snow Accumulation ◽

Arctic Lakes ◽

Nutrient Concentrations ◽

Human Influence ◽

Phytoplankton Communities ◽

Total Phytoplankton

Lakes and ponds are dominant components of Arctic landscapes and provide food and water for northern communities. In the Greiner Lake watershed, in Cambridge Bay (Nunavut, Canada), water bodies are small (84% < 5 ha) and shallow (99% <4 m). Such characteristics make them vulnerable to eutrophication as temperatures rise and nutrient concentrations from the greening landscape increase. Here, we investigated and compared 35 lakes and ponds in the Greiner watershed in August 2018 and 2019 to determine their current trophic states based on their chemical composition and phytoplankton communities. The ponds had higher trophic status than the lakes, but overall, most sites were oligotrophic. Lake ERA5, located upstream of any direct human influence was classified as eutrophic due to high total phosphorus (32.3 µg L<sup>-1</sup>) and a high proportion of Cyanobacteria (42.9% of total phytoplankton biovolume). Satellite imagery suggests the lake may have been eutrophic for the last 30 years. We hypothesize that the coupled effects of catchment characteristics and elevated local snow accumulation patterns promote higher nutrient leaching rates from the soils. We recommend further analysis and monitoring as eutrophication could become more widespread with ongoing climate change and the associated increases in temperature, precipitation, and catchment-lake coupling.

Download Full-text