Climate

Climate is the long-term pattern of weather in a region, usually looked at over 30 years. It includes things like temperature, humidity, wind, and how much it rains or snows. Climate helps shape the world around us, affecting everything from what plants grow to where animals live.

The climate of a place depends on many factors, such as how far it is from the equator latitude, the shape of the land terrain, and whether there are oceans nearby. Scientists study climate to understand how it changes over time and how those changes impact Earth.

Scientists use different ways to classify climates, like the Köppen climate classification, which groups places based on temperature and precipitation. They also look back in time using clues from nature, such as tree rings and ice cores, to learn about past climates. Today, many people are concerned about how the climate is changing because of things like global warming, which can affect weather patterns and the living world.

Definition

Climate is the long-term pattern of weather in a region, usually averaged over a period of 30 years. It includes not just the average weather, but also how much the weather changes from day to day or year to year. Important climate measurements are temperature, precipitation, and wind.

The difference between climate and weather can be simply put as: "Climate is what you expect, weather is what you get." Factors such as latitude, altitude, and proximity to oceans help shape a region's climate. Changes in gases like carbon dioxide in the atmosphere can also affect the planet's overall temperature.

Climate classification

Climate classifications are ways to group the world's climates into similar types. These systems help us understand how weather patterns vary across different regions. One well-known method is the Köppen climate classification, created in 1899, which links climate types to the kinds of plants and animals that live there.

Historically, people in Ancient Greece used simple climate descriptions based on where places were located. Today, scientists use two main approaches: studying the causes of climate or observing its effects. While these methods are useful, they sometimes create clear lines between climate zones, even though climates often change gradually in nature.

Record

Paleoclimatology

Main article: Paleoclimatology

Paleoclimatology is the study of Earth's past climate over very long periods. Scientists look at clues from ice sheets, tree rings, sediments, pollen, coral, and rocks to learn about ancient weather patterns. This helps us understand how Earth's climate has changed and stayed the same over time.

Modern

See also: Instrumental temperature record and Satellite temperature measurements

We know about today's climate from measurements taken with tools like thermometers, barometers, and anemometers over the past few centuries. These tools have improved over time, and records are often better in areas where many people live. Since the 1960s, satellites have helped us collect climate data from all over the world, including remote places like the Arctic and oceans.

Climate variability

Climate variability refers to the natural changes in Earth's average weather patterns over long periods. These changes can happen randomly or follow regular patterns, like the way seasons change each year. Factors such as the Earth's position in space, sunlight levels, and ocean currents all influence these climate patterns. Sometimes, big events like volcanic eruptions can temporarily mask these natural changes. Over time, the way we talk about climate variability and climate change has evolved, with climate change now mainly referring to long-term changes caused by human activities.

Climate change

See also: Global temperature record, List of weather records, and Extreme event attribution

Climate change is the way Earth's weather patterns change over long periods. These changes can happen because of natural reasons, like shifts in the planet's position, or because of things people do, such as burning fossil fuels. One big part of climate change is global warming, which is the rise in Earth's average temperature.

Earth has had many climate changes in the past, including times when large glaciers covered parts of the planet. These changes used to happen very slowly, but now they are happening much faster because of human activities, especially the release of greenhouse gases into the air. Scientists measure how much the Earth's climate is changing by looking at things like temperature and energy balance. Recently, the world's temperature has risen by about 1.5 degrees Celsius above normal levels.

Climate models

Climate models help us understand how the Earth’s climate works by using math to simulate energy moving between the atmosphere, oceans, land, and ice. These models balance energy coming from the sun with energy leaving the Earth, and any difference can change the planet’s average temperature.

Models come in different levels of detail, from very broad to very fine. Some can even focus on smaller areas to see how climate change might affect local weather. Recently, these models have been especially important for studying how increasing amounts of carbon dioxide and other greenhouse gas affect global temperatures, especially in colder parts of the world. They range from simple models to very complex ones that consider many factors working together.