Environmental Science and Interconnectivity Lecture Notes
Introduction
Matthias Kunert introduces the lecture on environmental science and interconnectivity, emphasizing the importance of understanding the dynamics and interconnected processes within the environment. He highlights that various fields of study are related to the landscape and its processes. To understand the context of your topics, it's important to know the overall dynamics and processes in the environment and how they connect to each other.
The Interconnectedness of Environmental Processes
Understanding the environment requires considering all its components and their interactions. This lecture aims to provide basic knowledge about these interactions to aid in understanding environmental dynamics. All processes interact with each other, and we need to understand these interactions if we work in this field and if if we want to face or address problems, challenges, and find solutions.
Landscape as an Example
A typical European landscape illustrates the interplay of food production, carbon storage, water resources, and human interaction with nature. The landscape is formed by ice age processes but also show shorter processes with yields, the harvesting of the fields every year. Similar dynamics and interactions can be observed worldwide, as the Earth is a closed and dynamic system.
Earth Science: Biotic and Abiotic Processes
Earth science encompasses both biotic and abiotic processes. These fields are closely linked and include physics, chemistry, and geoscience. The Earth functions as a nearly closed system, where energy can enter, but matter exchange is limited. Processes involve the flow of material and energy, driven by solar energy and regulated by feedback mechanisms. The earth is a closed system meaning dynamics are on the earth. Energy can enter but not material. There are few exceptions like space programs and meteors. In general, there's no exchange of material. It's a dynamic system of ongoing change and processes. With interactions, we see an exchange or flow of material and energy. Action and reaction are important.
Biogeochemical Cycles
Biogeochemical cycles illustrate the connections between abiotic and biotic processes, driven by energy fluxes and material exchange, largely powered by solar energy. Carbon, water, and nutrients interact within these cycles.
Key Environmental Challenges
Addressing climate change, biodiversity loss, and food insecurity requires understanding the interactions between different parts of ecosystems, including the atmosphere, biosphere, petosphere, and hydrosphere. It is essential for living, understanding and finding solutions. The different parts are threatened and interact. Only focusing on one of these aspects does not work.
Atmospheric Circulation and Global Ecosystems
Different regions—deserts, tropical forests, temperate areas, tundra, and polar regions—arise due to variations in temperature and precipitation, driven by solar energy. The amount of solar energy received depends on the earths angle. Tropics receive the highest energy and polar regions the lowest, creating imbalances in temperature, gradients, density, and pressure affecting the atmosphere. Climate change can shift these patterns, impacting ecosystems. Understanding the basic systems and dynamics is essential to understand how your ecosystems or habitats or animals are developing, and how you can explain your research results, and how you can solve major problems and challenges.
Hadley, Ferrel, and Polar Cells
The Hadley cell explains tropical forest and desert formation due to air rising at the Equator, losing moisture, and descending in subtropical regions. The earth circulating creates the Coriolis effect that leads to curved lines.
Extreme Weather Events
Changes in atmospheric systems can lead to extreme weather events, highlighting the need to understand these systems for developing solutions.
Vertical Structure of the Atmosphere
The atmosphere has a vertical structure, including the troposphere (where weather occurs), stratosphere (containing the ozone layer), mesosphere, and thermosphere. Planes fly in the troposphere. The stratosphere includes the ozone layer. The mesosphere drops and the thermosphere rises. It's important to see how the temperature is patterned in each layer. The thermosphere is responsible for the northern lights.
Atmospheric Composition and Greenhouse Gases
The troposphere consists mainly of nitrogen and oxygen, with trace gases like methane, nitrous oxide, and carbon dioxide, which are key greenhouse gases. These small percentages cause major problems. The troposphere is heated by reflection from the surface, with the absorption of energy dependent on the wavelength of light. Shortwave radiation enters the atmosphere and arrives at the earth. Then it reflects as long wave radiation. Particles in the atmosphere can absorb energy from this radiation. Absorption leads to energy not entering or leaving. The gasses absorb energy. Example: Water: is a green house gas. They are not problematic, regarding climate change like
Solar constant
The solar constant is watts per square meter, with an annual solar radiation average of watts per square meter.
Radiation Balance and Albedo
A radiation balance illustrates incoming solar radiation being reflected or absorbed, with greenhouse gases trapping outgoing infrared radiation. Albedo, the measure of light reflected by a surface, influences local climate and is affected by changes in land cover. The grassland is a good ecosystem, we want to store more carbon for some reason. Then you change the albedo.
Weather Profiles and Ecosystems
Weather profiles of different cities show variations in temperature and precipitation, affecting living conditions and habitats. Different gradients and combinations of temperature and precipitation controls the ecosystem and conditions. It controls what ecosystems you have and what you can do. Temperature and precipitations affect plant growth potential, with tropical forests having high production due to high temperature and precipitation, while deserts and tundra have low production.
Climate Zones and Terrestrial Biomes
Climate zones strongly influence terrestrial biomes, while aquatic biomes are driven by different environmental gradients like salinity and water depth. Terrestrial ecosystems are tied to climate gradients. Aquatic Biomes have different drivers like seawater salinity, freshwater seawater, and shallow and deep water.
Plate Tectonics
Plate tectonics shape the Earth's surface, causing earthquakes, volcanic eruptions, and influencing landscape formation over millions of years. divergent boundaries, convergent boundaries, and transform boundaries are all description of this plate movement. Plates are not static, they are moving all the time. They design to dispute destroy areas and oceans. Also, earthquakes, eruptions, and deep sea channels
Ocean Circulation, Gulf Stream, and Climate
Ocean circulation, including the Gulf Stream, significantly impacts climate and ecosystems. The Gulf Stream is slowing down because of climate change. Consequences will affect Britain. Oceans contain vast amounts of water influencing biological and geological processes. They control climate and weather patterns and store energy.
Thermohaline Circulation
Thermohaline circulation, driven by temperature and salinity differences, affects global ocean currents and is influenced by climate change. Density differences are caused by temperature and salinity. This is what leads to warmer water moving to polar regions, cooling, and then sinking, which interacts with overall ecosystems and food systems. This is important to understand so that changes in all things like food production can be understood.
Interconnectivity and Systems Thinking
Addressing climate change, biodiversity, and food insecurity requires systems-oriented thinking, considering interactions between biotic and abiotic processes and recognizing that solutions for one issue can impact others. Different aspects of influencing the system is that if you work on one, you also influence the others.
Scale of Problems and Solutions
Problems and solutions exist on different scales, from global climate change to local food production and landscape-level biodiversity efforts. Keep in mind the scale. Scale is small solutions but affects everybody.
Conclusion
Integrate abiotic processes to your thinking as they work with biotic ones during your studies.