Seamus Hammond
The word for the fragrance after a rain is 'petrichor'. The word was coined by Australian researchers Isabel Joy Bear and Richard Grenfell Thomas in 1964 from the Greek 'petra/petros' meaning 'stone' or 'rock' and 'ichor', the fluid that flowed in the veins of the gods in Greek mythology. The scent is produced when raindrops land on porous surfaces, forming small bubbles that release aerosols carrying the scent, along with bacteria and viruses, from the soil.
| Characteristics | Values |
|---|---|
| Name | Petrichor |
| Etymology | Coined from Greek 'petra' or 'petros' (stone or rock) and 'ichor' (the fluid that flows in the veins of the gods in Greek mythology) |
| Scientific Description | The earthy scent produced when rain falls on dry soil |
| Scientific First Description | By Isabel Joy Bear and Richard Grenfell Thomas in 1964 in their article, 'The Nature of Argillaceous Odour' |
| Smell | Warm and earthy |
| Cause | Rainwater releases microorganisms hidden in the earth, mixed with the smell of plant oils and ozone |
| Other Causes | Bacteria, lightning, and plants |
| Effect | Improved air quality as rain clears dust, aerosols, and other particulates |
| Other Effects | May induce a feeling of pleasure and cause people to breathe more deeply |
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What You'll Learn
The word 'petrichor' describes the scent of rain on dry soil
The word petrichor describes the scent of rain on dry soil. The term was coined by Australian scientists Isabel Joy Bear and Richard (Grenfell) Thomas in 1964. It is derived from the Greek 'petra' or 'petros' meaning 'stone' or 'rock' and 'ichor', the fluid that flowed in the veins of the gods in ancient Greek mythology.
Petrichor is the smell that is released when raindrops fall on dry, porous surfaces. The impact of the raindrop creates small bubbles of air that float up to the surface, releasing aerosols that carry the scent, along with bacteria and viruses from the soil. Slower-moving raindrops tend to produce more aerosols, which is why petrichor is often more noticeable after a light rain.
The scent is a combination of plant oils, ozone, and microorganisms released from the earth when it is hit by rainwater. The rain may also damage leaf hairs, releasing plant chemicals, or break dry plant material, crushing herbs and releasing their scent. Thunderstorms can also create the sharp scent of ozone caused by lightning and other electrical discharges.
The smell of petrichor is often considered pleasant and soothing, with a warm, earthy fragrance. Some scientists believe that the appeal of this scent may be evolutionary, as our ancestors may have relied on rainy weather for survival. Camels in the desert, for instance, rely on this scent to locate sources of water.
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Rainfall produces more petrichor when it is slower
The word "petrichor" refers to the scent of rain on dry soil. It was coined by Australian researchers Isabel Joy Bear and Richard Grenfell Thomas, derived from the Ancient Greek "petra" or "petros" meaning "rock" or "stone", and "ichor", the ethereal fluid that is the blood of the gods.
Petrichor is produced when raindrops land on porous surfaces, causing air from the pores to form small bubbles that float to the surface and release aerosols. These aerosols carry the scent, as well as bacteria and viruses from the soil. The scent is derived from an oil exuded by certain plants during dry periods, which is then absorbed by clay-based soils and rocks. When rain falls, the oil is released into the air along with another compound, geosmin, a metabolic by-product of certain actinobacteria, which is emitted by wet soil, creating the distinctive scent.
Rain that falls slowly produces more petrichor due to the increased number of aerosols released. This is why petrichor is more common after light rains. The slower speed of the raindrops allows more air to be trapped and released as bubbles, carrying the scent of the soil and bacteria, and resulting in a stronger fragrance.
The human nose is highly sensitive to geosmin and can detect it at very low concentrations. Some scientists believe that humans appreciate the scent of rain due to our ancestors' reliance on rainy weather for survival. Camels in the desert also depend on petrichor to locate sources of water, such as oases.
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The scent of rain has been bottled as a fragrance
Petrichor is the earthy scent produced when rain falls on dry soil. It is the result of various factors, including the release of microorganisms and plant oils from the earth, as well as the presence of ozone. The human nose is highly sensitive to petrichor, and many people find the scent appealing, perhaps due to its association with clean air and improved air quality after a rainstorm.
The process by which petrichor is created involves raindrops landing on porous surfaces, forming small bubbles that release aerosols carrying the scent, along with bacteria and viruses from the soil. Slower-moving raindrops tend to produce more aerosols, which is why petrichor is often more noticeable after light rains.
Capturing the essence of petrichor, perfumer Lyn Harris created the fragrance "Rain Wood", a joyous scent evoking new beginnings. With notes of galbanum, green angelica, cedar, juniper berries, pine, and patchouli, "Rain Wood" captures the fresh, rainy scent in a bottle.
The allure of petrichor has captivated scientists, perfumers, and pluviophiles alike, offering a sensory experience that delights the nose and evokes a sense of wonder.
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Rain releases microorganisms, plant oils, and ozone
The word for the fragrance after rain is "petrichor". The term was coined by Australian researchers Isabel Joy Bear and Richard Grenfell Thomas in 1964 from the Greek "petra" or "petros" (meaning "stone" or "rock") and "ichor" (the fluid that flowed in the veins of the gods in Greek mythology).
Petrichor is the result of rain releasing microorganisms, plant oils, and ozone. When rain falls, it releases microorganisms hidden in the earth. These include bacteria, such as Streptomyces, which produce the molecule geosmin—a key component of the petrichor scent. Members of the Actinomycetes, gram-positive bacteria, are responsible for producing the aerosols that carry the scent, as well as bacteria and viruses from the soil.
Plant oils also contribute to the fragrance of petrichor. Rain can damage leaf hairs, releasing plant chemicals that have a pleasant smell. Similarly, dry plant material can be broken down by rain, releasing compounds that intensify the scent. During dry periods, plant metabolism may slow down, and renewed rainfall can stimulate it, causing plants to release a pleasant fragrance.
Ozone, which has a clean, sharp scent, is also associated with petrichor. Thunderstorms create ozone through lightning and other electrical discharges in the atmosphere. The scent of ozone contributes to the overall fragrance of petrichor, which has captivated scientists, perfumers, and the general public alike.
The phenomenon of petrichor has intrigued people for centuries, with early observations dating back to the 19th century. It continues to be a subject of scientific exploration and a source of inspiration for perfumers aiming to capture the essence of rain in their fragrances.
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Lightning and thunderstorms improve air quality
Petrichor is the word used to describe the unique scent that follows a rain shower. The word was coined by scientists Isabel Joy Bear and Richard Grenfell Thomas in 1964, from the Ancient Greek "petra" (stone or rock) and "ichor", the ethereal fluid that is the blood of the gods in Greek mythology.
Lightning and thunderstorms, on the other hand, are often associated with air pollution. Lightning ignites complex chemical reactions that result in the formation of ground-level ozone, which can cause a range of breathing issues and harm the agricultural industry. However, recent studies have found that lightning also produces large amounts of highly reactive molecules that break down greenhouse gases such as carbon dioxide and methane.
While the impact of lightning on air quality is still being studied, researchers have found that in areas with low human-generated NOx emissions, lightning-related NOx can significantly impact overall NOx levels and contribute to an increase in ozone levels. As air quality regulations tighten and anthropogenic sources of ground-level ozone are reduced, understanding the natural contribution of lightning becomes more important.
To better understand the connection between climate change, lightning, and air quality, scientists will soon have access to a new space-based tool called Tropospheric Emissions: Monitoring of Pollution (TEMPO). This instrument will monitor major air pollutants in the atmosphere and help determine whether the increase in lightning due to climate change shields us from or exacerbates the effects of climate change.
In conclusion, while lightning and thunderstorms can indirectly contribute to air pollution through the formation of ozone, they may also play a role in breaking down greenhouse gases. Further research is needed to fully understand the impact of lightning on air quality and to determine whether it ultimately improves or deteriorates air quality.
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Frequently asked questions
The word is 'petrichor'.
Petrichor means the scent produced when rain falls on dry soil.
The word comes from the Greek 'petra' or 'petros' meaning 'stone' or 'rock', and 'ichor', the fluid that flows in the veins of the gods in Greek mythology.
The word was first used in a scientific article in 1964 by Australian researchers Isabel Joy Bear and Richard Grenfell Thomas, although Thomas's middle name is sometimes given as 'Grenville'.
Petrichor is caused by the release of aerosols, bacteria, plant oils and ozone when raindrops fall on porous surfaces.
