Hydrology and Climate: Water's Unique Properties
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Questions and Answers

What effect does thermal stratification have on the oxygen levels in lakes during summer?

Thermal stratification can lead to lower oxygen levels in deeper water layers as the warmer upper layer prevents mixing with the colder lower layers.

Why is the high specific heat of water important for climate regulation?

The high specific heat of water allows it to absorb and store large amounts of heat, helping to moderate temperature changes in the environment.

How does surface tension affect the behavior of small organisms in water?

Surface tension allows small organisms, like water striders, to walk on the water's surface without sinking.

In what way does viscosity affect the movement of organisms in water?

<p>Higher viscosity in water can hinder the movement of organisms, making it more energy-intensive for them to swim.</p> Signup and view all the answers

What role does the presence of dissolved salts play in the density of liquid water?

<p>Dissolved salts increase the density of liquid water, which can influence its stratification and circulation in aquatic environments.</p> Signup and view all the answers

How does the thermal property of water impact its ability to support life?

<p>Water's thermal properties create stable conditions conducive to life, such as maintaining suitable temperatures for aquatic organisms.</p> Signup and view all the answers

How does temperature stratification in lakes influence the distribution of nutrients?

<p>Temperature stratification can inhibit nutrient mixing from the bottom to the surface, leading to nutrient depletion in warmer surface waters.</p> Signup and view all the answers

What is the significance of liquid water's unique properties in the context of climate change?

<p>Liquid water's unique properties, like high heat capacity, play a critical role in regulating Earth's climate and mitigating rapid temperature shifts due to climate change.</p> Signup and view all the answers

What effect does radiative cooling at night have on air temperature in valleys with thermal inversions?

<p>Radiative cooling causes the coldest air to be near the surface, leading to a temperature inversion where air temperature increases with altitude.</p> Signup and view all the answers

How does the heat island effect impact urban temperatures?

<p>Heat islands result in higher urban temperatures due to the replacement of vegetation with impervious surfaces and the generation of waste heat.</p> Signup and view all the answers

What happens to air as it descends down mountain slopes in areas affected by thermal inversions?

<p>As air descends, it warms up, contributing to the temperature increase associated with thermal inversions.</p> Signup and view all the answers

How does the presence of tall buildings and narrow streets influence air temperature in urban settings?

<p>Tall buildings and narrow streets can trap heated air and restrict airflow, exacerbating the heat island effect.</p> Signup and view all the answers

What is the role of vegetation in regulating urban temperatures?

<p>Vegetation provides cooling through shading and evapotranspiration, which helps mitigate urban heat island effects.</p> Signup and view all the answers

In what ways does waste heat contribute to urban temperature rises?

<p>Waste heat from vehicles, factories, and air conditioning systems adds warmth to the environment, exacerbating the heat island effect.</p> Signup and view all the answers

Why is the depletion of the ozone layer a concern for human health?

<p>Depletion of the ozone layer increases exposure to harmful UV radiation, which can trigger health problems, especially in vulnerable populations.</p> Signup and view all the answers

How does ambient ozone exposure affect vulnerable populations?

<p>Exposure to ambient ozone, even at low levels, can lead to various health problems in vulnerable populations.</p> Signup and view all the answers

What is thermal stratification in lakes and why is it important for aquatic life?

<p>Thermal stratification refers to the layering of water in a lake due to temperature differences, creating distinct zones. It is important for aquatic life because it affects oxygen distribution and the habitat conditions for various organisms.</p> Signup and view all the answers

How do the thermal properties of water contribute to its role in regulating climate?

<p>The high specific heat capacity of water allows it to absorb and store large amounts of heat, helping to regulate climate by moderating temperature fluctuations in the environment. This characteristic is crucial for maintaining stable weather patterns.</p> Signup and view all the answers

Explain the concept of surface tension and its significance in biological systems.

<p>Surface tension is the result of cohesive forces between water molecules at the surface, causing it to behave like a stretched elastic membrane. This property is significant for organisms such as water striders, which rely on it to walk on water, and it also affects processes such as nutrient absorption in plants.</p> Signup and view all the answers

What role does viscosity play in the movement of water and its interaction with aquatic organisms?

<p>Viscosity is a measure of a fluid's resistance to flow; in water, it affects how easily it moves and its ability to transport nutrients and organisms. Higher viscosity can hinder movement for small aquatic animals and impact their feeding and locomotion.</p> Signup and view all the answers

Describe two critical characteristics of liquid water that distinguish it from most other liquids.

<p>Two critical characteristics of liquid water are its high heat capacity and its ability to expand upon freezing. These properties are essential for maintaining life, as they influence climate stability and create a unique aquatic environment.</p> Signup and view all the answers

How does the concept of integrated development planning relate to natural resource management?

<p>Integrated development planning involves balancing environmental, social, and economic factors to ensure sustainable use of natural resources. This approach helps to prevent resource depletion while promoting development that is environmentally conscious.</p> Signup and view all the answers

In what way can international cooperation help in addressing environmental challenges related to water resources?

<p>International cooperation can facilitate shared research, technology transfer, and the establishment of policies that address transboundary water issues effectively, ensuring that water resources are managed sustainably across different nations.</p> Signup and view all the answers

Why is environmental education considered essential for sustainable management of water resources?

<p>Environmental education raises awareness about the importance of water conservation and sustainable practices, empowering individuals and communities to make informed decisions that positively impact water resource management.</p> Signup and view all the answers

Study Notes

Environment Definition

  • Environment encompasses the physical factors surrounding humans, including land, water, atmosphere, climate, sound, odor, taste.
  • It also includes biological factors, such as animals and plants, and the social factor of aesthetics.
  • This definition is from the Environmental Quality Act, 1974.
  • Environment comprises Physical, Chemical, Biological, Social, and Aesthetic factors.
  • Physical: Water, Earth's atmosphere, sources & processes of pollutants.
  • Chemical: Ecological concept, biogeochemical cycle, natural resources (rivers, wetlands).
  • Biological: Ecological concept, biogeochemical cycle, natural resources (rivers, wetlands), biodiversity & conservation.
  • Social: Health & environment, socio-political & environment, environmental education, environmental regulation & laws.
  • Aesthetic: (no further detail provided).

Establishment of Department of Environment in Malaysia

  • The Environmental Quality Act was approved on March 14, 1974 and enforced on April 15, 1975.
  • A Division of Environment (BAS) was created on September 15, 1975, under the Ministry of Local Government and Environment.
  • BAS was later transferred to the Ministry of Science, Technology and Environment in March 1976.
  • BAS was upgraded to the Department of Environment (JAS) on September 1, 1983.
  • JAS was moved to the Ministry of Natural Resources and Environment in April 2006.

Our Common Future (Brundtland Report)

  • Published in 1987 by the United Nations World Commission on Environment and Development (WCED).
  • Focused on multilateralism and interdependence of nations.
  • Recaptured the spirit of the Stockholm Conference, which brought environmental concerns to the political agenda.
  • Viewed environmental and development as a single issue.
  • Resulted from a 900-day international effort involving governments, researchers, organizations, and the public..

The Brundtland Commission's Mandate

  • Re-examine critical environment and development issues, and create realistic action proposals.
  • Strengthen international cooperation.
  • Raise awareness and commitment to action among individuals, organizations, and governments.
  • Focused on population, food security, species loss, genetic resources, energy, industry, and human settlements.

UN Conference on the Human Environment (Stockholm, 1972)

  • The UN Conference on the Human Environment was held in Stockholm between June 5-16, 1972.
  • Sweden hosted the conference.
  • The conference fostered international cooperation on environmental issues, including human rights, natural resources, and pollution.
  • A set of recommendations, an action plan, and a resolution were adopted.

Water & Properties

  • Water's unique physical and chemical properties make it essential for life.
  • Water plays vital roles in the biosphere.
  • Water exists in all three states (liquid, solid (ice), gas) on Earth's surface.
  • Water's density is a maximum at 277K.
  • Water expands when it freezes. This has ecological implications (rock weathering, lake stratification)
  • Water has high surface tension. High cohesive forces allow many organisms to move on the water's surface. Capillary action in plants is facilitated by water's high surface tension.
  • Water has a high heat capacity. This is a function of its hydrogen bonding. Organisms are able to maintain stable internal temperatures.
  • Pure water is colorless, odorless, and transparent. This transparency allows the penetration of light through water bodies, enabling photosynthesis in aquatic plants.
  • Thermal stratification in lakes: Epilimnion (top), Metalimnion/Thermocline (middle), and Hypolimnion (bottom). These layers exist due to temperature and density differences in water.
  • Water's role in the water cycle.

Water Usage

  • Oceans hold 97.41% of all water on Earth.
  • Freshwater accounts for 2.59%. Only 0.003% of water is readily available on Earth, mostly in lakes.

Atmospheric Science & Pollution

  • Air pollution is defined as the presence of one or more contaminants in amounts and durations harmful to human, animal, or plant life or property.
  • Primary pollutants: Emitted directly into the environment (e.g. CO, NOx, HC from motor vehicle exhaust).
  • Secondary pollutants: Formed by reaction in the environment (e.g. O3, PAN in photochemical smog).
  • Major environmental issues related to atmosphere: local (e.g., heat island), regional (e.g., acid rain), and global (e.g., ozone layer depletion, global warming).
  • Major Pollutants in the atmosphere: Sulfur oxides (SOx), Nitrogen oxides (NOx), Carbon monoxide (CO), Carbon dioxide (CO2), Volatile organic compounds (VOCs), Particulate matter (PM), Toxic metals, and Chlorofluorocarbons (CFCs).
  • Additional pollutants: Ammonia (NH3), Odors (garbage, sewage, industrial processes), Radioactive pollutants (nuclear explosions, natural processes like radon), Peroxyacetyl nitrate (PAN).
  • Heat Island phenomenon: A metropolitan area is significantly warmer than its surrounding rural areas owing to the lack of vegetation, heat generated from buildings and people as well as from roads.
  • Temperature inversions (from heat island effects): A stable layer of warm air above cooler air prevents pollutants from rising. They get trapped in valleys or near mountains.

Ozone Layer Depletion

  • CFCs, halogens, and other ozone-depleting substances (ODS) lead to ozone depletion in the stratosphere.
  • CFCs were widely used in refrigerants, aerosols, and cleaning agents.
  • Ozone depletion results in increased levels of UV radiation reaching Earth's surface which damages living organisms, crops, and animals.
  • Effects of depletion: Increased skin cancer rates, cataracts, harm to vegetation, and effects on animal populations.

Acid Rain

  • Acid rain is precipitation with an unusually low pH caused primarily by human-produced sulfur and nitrogen compounds reacting in the atmosphere with water.
  • Acid rain damages the environment (soils, water), structures (buildings, statues), and ecosystems.
  • Natural sources that produce acid components exists: volcanoes and dimethylsulfide, from various biological processes.

Global Warming

  • Global warming refers to an increase in the average temperature of Earth's surface.
  • It has been observed for centuries and is now increasingly considered related to greenhouse effect.
  • Gases in the atmosphere trap heat improving the average temperatures of the planet.

Greenhouse Effect

  • Solar energy is absorbed by the Earth.
  • Heat is radiated back into space.
  • Greenhouse gases reflect some of this heat energy back towards Earth making the planet warmer.

Human Impacts on Global Warming:

  • Greenhouse gases (e.g. CO2, Methane, Nitrous oxide, Florinated compounds).

Natural Impacts on Global Warming:

  • Volcanoes, water vapor, clouds.

Who's Responsible : Greenhouse gasses emissions

  • Burning fossil fuels is a primary source of greenhouse gases.
  • The US has high emissions.

Ice Melting

  • Observed reductions in ice coverage.
  • Related to global warming impacts.

Changes in Global Temperature

  • Global average temperatures have risen considerably.
  • Changes are often measured in graphs showing trends through time.

What you have to do?

  • Individuals and governments have a shared responsibility for improving environmental conditions.
  • Prevent environmental degradation.
  • Consider ways to lower emissions and lessen the effect of environmental degradation.

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Description

Explore the fascinating effects of water's unique properties on ecosystems and climate. This quiz covers the impact of thermal stratification on lake oxygen levels, the significance of water's specific heat for climate regulation, and how factors like surface tension and viscosity affect aquatic organisms. Test your understanding of these crucial environmental concepts.

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