Questions tagged [atmospheric-radiation]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
14
votes
2answers
8k views

Is spectrum of sunlight the same in the summer as in the winter?

Of course we receive less sunlight in winter, because the sun is lower in the sky, so the light has to travel through more atmosphere, and loses strength. Does this mean that the blue light is more ...
12
votes
2answers
240 views

What atmospheric radiative effects, if any, do contrails cause?

First of all, this question is not about the conspiracy theory based chemtrails as in the linked question, from the answers there and from the question Equation for predicting contrail formation I ...
10
votes
2answers
564 views

Why is the Earth's shadow blue?

After every sunset, once the sun is gone, I always enjoy seen the belt of venus rising in the other side, followed by the Earth's shadow. This is a picture I took (you will find better ones online). ...
9
votes
2answers
23k views

How does the Sun heat the Earth?

The core of the sun has a temperature of 15,000,000 °C. The surface of the sun has temperature around 5,000 °C. The sun is around 93 million miles (150 million km) away from earth. My Question: With ...
8
votes
1answer
1k views

Why is it colder in the mountains than at sea level?

I have heard numerous reasons why that is. I just want to know which one is right.
8
votes
1answer
344 views

Why does the road appear wet on a sunny day?

Whenever I'm travelling by road on a hot sunny day and I look towards the horizon, it appears as though there is puddle ahead but as I approach it, it disappears. Why does this happen?
7
votes
1answer
369 views

What reflects UV radiation more: stratus clouds or cumulus clouds?

Interested in this since I sometimes look down on the clouds in the plane, and wonder if some of the reflected UV-A radiation might damage my eyes.
7
votes
0answers
440 views

Monitoring air pollution with Landsat satellite data

I'm trying to build an air pollution model. So far I have built one for point sources. Now I'm looking at monitoring air pollution with satellite images, based on the idea that every basic pollutant ...
6
votes
2answers
559 views

Why are solar longwave and terrestrial shortwave radiations neglected in radiation balance models?

For an assignment I was given the question: Explain why solar radiation is neglected in atmospheric “long wave” calculations and Earth radiation is neglected in atmospheric “short wave” calculations. ...
6
votes
2answers
5k views

Why is ozone a greenhouse gas if it absorb UV radiation?

Ozone is considered a greenhouse gas, even though it absorbs shortwave (UV) radiation from the Sun, which does not fit with the definition for greenhouse gases, where they are supposed to: "absorbs ...
6
votes
1answer
159 views

What is brown carbon?

There is a lot of interest in brown carbon in the atmospheric science community these days. There is a paper in the journal, "Atmospheric Chemistry and Physics" titled, "Black carbon or brown carbon? ...
6
votes
1answer
104 views

What is the ratio of infra-red light absorbed by green house gases?

I know that some gases like CO2, N2O and CH4 absorb infra red radiation. What is the proportion or percentage of radiation absorbed by CO2 among all the gases?
5
votes
2answers
3k views

Equation for solar radiation at a given latitude?

I'm trying to find equations that would help me determine the amount of solar radiation hitting a certain latitude on a certain planet given the following inputs: the degrees of latitude of the ...
5
votes
2answers
6k views

How much and what kind of radiation passes through a cloud?

I've read that 80% of sunlight is passing through clouds. Now there a small clouds and big clouds so it should be some average. Is this true or is the amount of sunlight passing throug a cloud really ...
5
votes
1answer
238 views

What would a planet's sky look like with different chemical compositions, such as low nitrogen, high methane etc?

What are the processes, chemicals and particles involved in creating colour in a planet's sky? Could you give some examples of sky colour processes different from what happens on Earth?
5
votes
1answer
1k views

How to calculate the solar radiation at any place, any time

The solar radiation is one of the important factors controlling the formation of $O_3$, and thereby impacting the levels of various secondary species in the atmosphere. However, in the campaign of ...
5
votes
1answer
84 views

How to calculate the back radiation from greenhouse gases?

How would one go about calculating the value for back radiation(324 in this diagram) if it wasn't provided. According to this website, it is "equivalent to 100 percent of the incoming solar ...
5
votes
0answers
37 views

What exactly causes this moving orange glow before sunrise?

I've been watching twilights for some time, and noticed that each time there's a very clear sky, an orange-pinkish glow is visible at the solar azimuth when Sun is somewhere between 1° and 5.5° below ...
5
votes
0answers
59 views

Direct and Diffused component of shortwave radiation in ERA5 data

I am following the paper to calculate UTCI using ERA5 meteorological variables. https://link.springer.com/article/10.1007/s00484-020-01900-5?shared-article-renderer In the paper, the authors have ...
5
votes
4answers
692 views

Gases that are nearly transparent to solar AND thermal radiation?

I've been curious about if there are any gases in the atmosphere that are nearly transparent to both solar and thermal radiation. CO2 for instance is nearly transparent to solar radiation but is ...
4
votes
2answers
203 views

Are we changing Earth's weather with global warming?

I think that when the air heats up in the day, the radiation from the ground contributes way more to its heating at altitudes more than 300 meters above the ground than convection currents of air heat ...
4
votes
2answers
481 views

Effective Temperature of a Planet and Surface Temperature due to Greenhouse Effect

The effective temperature of the Earth is roughly 12 °F (- 11 °C), which means that in thermal equilibrium when it is emitting as much radiation as it is absorbing, the distribution of wavelengths and ...
4
votes
2answers
148 views

How much would 5 gigatons of methane warm the atmosphere compared to 5 gigatons of CO2 if both were released in one go?

I don't know much about science, I'm just curious about how much warming a certain amount of CH4 would cause compared to a similar amount of CO2 (both 5 GtC). I'm sorry if the question sounded a bit ...
4
votes
1answer
81 views

How to derive the total potential energy of the atmosphere?

In one of Lorenz’s paper (I mean the meteorologists Edward Lorenz), he stated that the total potential energy of the whole atmosphere $P + I$ (means the sum of potential energy and internal energy) is ...
4
votes
1answer
583 views

What is radiation divergence?

What is radiation divergence, in the context of atmospheric physics? For example, the phrase is used in this paper.
4
votes
1answer
91 views

What causes aurorae?

I know that aurorae are caused by solar activity interacting with the Earth's magnetic field as charged particles are funneled down into the polar magnetic mirrors. On one hand, I know that as ...
4
votes
1answer
539 views

How much do anthropogenic carbon aerosols (soot) affect the atmospheric radiation budget?

Anthropogenic carbon or black carbon (BC), particularly soot, is a product of many human activities, a major one being incomplete combustion of hydrocarbons. The occurrences of soot are mainly in ...
4
votes
0answers
218 views

Can the absorbtion of infrared around the 650 wavenumber in water be a substantial cause of converting that spectrum range into other spectra?

CO2 absorbs around the 15 microns wavelenght or wavenumber 650, and radiates in the same but also a somewhat wider range. However, the top layer of the oceans seem to also convert that spectrum range. ...
3
votes
3answers
370 views

What are the major contributors to the amount of infra-red emitted by the earth?

From the answers from an earlier question, I learned that most of the solar radiation gained by the earth system (atmosphere, surface, and inner mass) is re-radiated back into space in the form of ...
3
votes
1answer
2k views

What is the difference between radiation balance and the global energy balance?

Looking at two diagrams below, they seem to depict the same system. How are they different? Why one is a radiation balance model and the other a global energy balance model? RADIATION BALANCE MODEL: ...
3
votes
1answer
709 views

How to calculate 3-hour flux values in ERA-Interim?

Referring to the post: https://www.myroms.org/forum/viewtopic.php?f=30&t=3003 I understood how to calculate the slhf and sshf for 03, 06, 09 and 12 time steps. But I have values for 00, 15, 18 ...
3
votes
1answer
125 views

How does Earth's thermal radiation into space vary by location and time of day?

CHEOPS (also 1, 2, 3) is a space telescope recently put in low Earth orbit to look for exoplanets around other stars. It uses a cooled detector array and so uses a heat shield to avoid thermal ...
3
votes
1answer
88 views

How would this experiment's different particle types produce atmospheric reflectivity?

The MIT Technology Review news item Harvard Scientists Moving Ahead on Plans for Atmospheric Geoengineering Experiments discusses a proposed experiment to study in a carefully controlled way the ...
3
votes
1answer
1k views

shortwave and longwave radiation terminology, direct, beam, PAR, flux?

Some reanalysis data sets provide different components of shortwave radiation (near infrared and visible) and longwave. They are referred as radiation or flux. Also there is no mention of "direct" ...
3
votes
1answer
62 views

Can Horizontal Radiation Fluxes Contribute to Net Column Heating?

I've noticed that in many papers it's common to assume the (daily or longer averaged) vertically integrated radiative heating can be expressed $F_z(\text{TOA})-F_z(\text{SURF})$, where $F_z$ is the ...
3
votes
0answers
66 views

Why is the Regener-Pfotzer maximum (radiation in upper atmosphere) above central California?

The site https://spaceweather.com/ has a section called Space Weather Balloon Data which shows the image below and says: The data points in the graph above correspond to the peak of the Regener-...
3
votes
0answers
47 views

Amount of scattered vs. direct UV light from the Sun

I was wondering about the common saying that on a sunny, cloud-free day, depending on location, you can get a sunburn even when spending the whole day in the shadows. Already our blue sky provides ...
2
votes
2answers
214 views

Why doesn't the earth become superheated?

One day I was sitting in an Atlanta traffic jam wondering about all the engine exhaust heat warming the localised environment. Later that night, things will have cooled down. Where did the heat go? ...
2
votes
2answers
598 views

How is surface pressure generally measured, and at what actual height?

In various atmospheric equations, surface pressure is one of the variables used. For example, in calculating the density of air or pressure-corrected relative optical air mass. How is surface pressure ...
2
votes
1answer
71 views

solar irradiance/radiation difference

I currently read a few papers and one of them stated to forecast solar irradiance using measures of solar radiation. I hope this question is not trivial as I'm actually from germany, but if there is a ...
2
votes
1answer
90 views

Why a stratus cloud does not always reach all the way to the ground?

The surface of the ground at night cools down because of outgoing long-wave radiation. In my understanding the cooling of the surface also causes cooling of the adjacent air. If the air contains ...
2
votes
0answers
110 views

How does extra carbon dioxide in the atmosphere contribute to radiative forcing?

The CO2 absorption spectrum taken at 200 mmHg partial pressure, beam path length = 10 cm, resolution = 4 cm^-1 shows that light can only travel a couple hundred meters before being completely absorbed ...
2
votes
0answers
54 views

How to convert solar radiation into equivalent evaporation

I have come across two (apparently) different equations for this purpose. One is mentioned in BASINS software code here $$Rad\_len [inday^{-1}] = \frac{SolRad[langleysday^{-1}]}{((597.3 - 0.57 * ...
2
votes
1answer
104 views

Does depletion of Planck radiation intensity in the upper atmosphere mean that "CO2 has no impact on climate change"?

In his recent book, Rex J. Fleming asserts that "CO2 has no impact on climate change", or, as he summarizes on his website: There are now over a dozen books available on Amazon.com that point out ...
1
vote
2answers
132 views

If I build a concrete surface on a 1km x 1km area and painted it black, will I create convection (updraft from ground)?

Providing there are low wind conditions and a clear sky, will the 1 km x 1 km black surface create an upward convention? Let’s say I were to do this at 60$^\circ$ N longitude in march month, the ...
1
vote
2answers
77 views

Relationship between rainwater and solar radiation

I am an enthusiast in this area and reading some scientific articles on precipitation forecasting and solar irradiation, I was wondering if these two variables have any direct correlation or ...
1
vote
1answer
1k views

Understanding a diagram of Earth's radiation balance

Trying to understand this image. Can someone tell me if I have the right reasoning here: Sun has 100% SW shooting to earth 30% of that 100% is reflected by clouds 70% remains Of that 70%, 45% of that ...
1
vote
0answers
24 views

Looking at the brightest parts of the image how would one find the blackbody curve and wavelength maximum using a radiance calculator?

Look at the brightest parts of the photo and use a radiance calculator to find the blackbody radiation curve (show the plot of the curve) and the wavelength of maximum emission. How do ...
0
votes
2answers
446 views

What is the intensity of terrestrial radiation? [closed]

I wanted to know what's is the intensity of terrestrial radiation? I mean the long wave radiation emitted by Earth & its atmosphere. As, I was differentiating between solar radiation and ...
0
votes
1answer
33 views

Flux density and albedo

To save the Earth, the surface of the Earth has been covered by silver foil. The foil has a albedo of 0.9. What is the flux density emitted from the surface of the Earth (assume temperature of 50 deg ...