Questions tagged [atmospheric-radiation]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2 votes
0 answers
35 views

What is the difference between Radiative Forcing and Energy Budget

I don't understand the difference between radiative forcing and an energy budget. They seem like the same concept to me but I cannot find anything that directly compares them.
Benjamin Kilpatrick's user avatar
0 votes
0 answers
26 views

How should one even try to start thinking about quantifying the total emissions footprint for the planet?

I was recently reading a paper in which nine planetary boundaries have been proposed. The paper uses modeling and literature assessment to quantify safe and just Earth system boundaries (ESBs) for ...
Sujai Banerji's user avatar
2 votes
1 answer
35 views

Estimate EPW AMY parameters from HRRR Analysis

I am working to create Energy Plus Weather (EPW) Actual Meteorological Year (AMY) files from NOAA HRRR Model analysis. The provided links detail the 35 parameters required for the AMY model and ...
J Edward Hammond's user avatar
3 votes
0 answers
86 views

Why does the blue hour look pink when watched from an isolated island?

Blue hour is a part of nautical twilight when sky is very blue. This blueness appears because of Chappuis absorption of reddish light in stratospheric ozone. At later stages of nautical twilight, near ...
Ruslan's user avatar
  • 461
2 votes
2 answers
2k views

What is technically wrong with Wijngaarden & Happer's paper claiming to show that CO2's contribution to surface warming is saturated?

The paper, Dependence of Earth’s Thermal Radiation on Five Most Abundant Greenhouse Gases1, has been reportedly rejected from several major journals. By analysing absorption spectra of greenhouse ...
SLD's user avatar
  • 137
3 votes
0 answers
107 views

Estimation of extraterrestrial radiation for latitudes > 66.5° N/S

I'm posting here for the first time, so I hope not to violate any community-specific rules. In Allen et al. (1998): FAO-56 an equation is presented to estimate extraterrestrial radiation Ra for ...
dimfalk's user avatar
  • 131
2 votes
0 answers
141 views

Why did the air not heat up in this experiment demonstrating the atmospheric greenhouse effect?

In the paper "Experimental Verification of the Greenhouse Effect" (full version: "Verification of the Greenhouse Effect in the Laboratory", Hermann Harde, Michael Schnell 2022), ...
Dale Cloudyman's user avatar
2 votes
1 answer
103 views

How does a volcanic eruption cool the planet's surface?

For example, after the eruption of Mt. Pinatubo in 1991 according to this paper, The introduction of large amounts of sulphuric acid aerosol into the stratosphere increases the planetary albedo (...
pretzlstyle's user avatar
5 votes
2 answers
854 views

Why doesn't earth radiate at wavelengths where there is strong absorption?

Having in mind the absorption of IR radiation by various atmospheric gases, why is there almost no outgoing radiation into space where absorption is strong? At the $CO_2$ 15um wavelength, there is ...
MichaelW's user avatar
  • 905
3 votes
3 answers
121 views

Why do clouds have positive climate feedback although they have a cooling net effect?

In a lecture we learned that instantaneously removing all clouds from earth would give radiation forcing of about 18W/m² [1], leading to significant warming. So clouds, in simple words, cool the earth ...
MichaelW's user avatar
  • 905
3 votes
0 answers
192 views

How can a single layer atmospheric model for the greenhouse effect be consistent with adiabatic temperature gradient and optical depth considerations?

I'm completely lost...In an elementary course on meteorology, we recently learned how to explain the greenhouse effect in terms of a simple single-layer atmosphere model. Based on the image below ...
MichaelW's user avatar
  • 905
3 votes
2 answers
259 views

Why is dependence of radiation forcing on CO2 concentration logarithmic?

As a newbie on climate science and meteorology I'm trying to understand the almost logarithmic behavior of CO2 concentration on radiation forcing $$F(c) = A \cdot \ln \frac{c}{c_0}$$ and why there is ...
MichaelW's user avatar
  • 905
6 votes
1 answer
167 views

Interpretation of Mie scattering

I’m usually on Physics SE, but this question seems to fit better into Earth Sciences: I’m interested in radiation transfer and in particular Mie scattering in the atmosphere. So I did some calculation ...
Charles Tucker 3's user avatar
5 votes
1 answer
470 views

Why is there a window in the absorption spectrum of Earth's atmosphere at a wavelength of 4 μm?

Looking at the Wikipedia page for absorption bands, it seems to me that there's a sizable window - i.e. a local minimum - in the graph for electromagnetic radiation absorption, as per the edited image ...
KEY_ABRADE's user avatar
4 votes
1 answer
75 views

Where does this refractive index formula come from: $n_{1} = n - 1 = \frac{77.6P}{T} 10^{-6}$

In this equation, $n_{1} = n - 1 = \frac{77.6P}{T} \cdot 10^{-6}$ the variable P is the total air pressure and T is expressed in Kelvin. This equation describes the refractive index of moist air as EM ...
Electrolyte's user avatar
5 votes
3 answers
257 views

How does water vapor cool the troposphere?

I have read about the Fixed Anvil Temperature (FAT) hypothesis and wonder why radiative cooling decreases with decreasing water vapor mixing ratio. Doesn't this stand in contrast with the fact, that ...
Jan's user avatar
  • 53
6 votes
0 answers
211 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 ...
Ruslan's user avatar
  • 461
5 votes
1 answer
472 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 ...
import_hill's user avatar
4 votes
2 answers
398 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 ...
Victor1995's user avatar
5 votes
0 answers
233 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. ...
MP1's user avatar
  • 71
1 vote
2 answers
114 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 ...
Dex's user avatar
  • 11
4 votes
1 answer
178 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 ...
 Hou's user avatar
  • 103
1 vote
1 answer
135 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 ...
Mathomat55's user avatar
5 votes
0 answers
122 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-...
uhoh's user avatar
  • 7,096
3 votes
1 answer
69 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 ...
Ewan's user avatar
  • 173
7 votes
1 answer
278 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 ...
Golam Rabbani Fahad's user avatar
1 vote
2 answers
139 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 ...
Sarthak Tiwary's user avatar
3 votes
1 answer
141 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 ...
uhoh's user avatar
  • 7,096
3 votes
0 answers
174 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 ...
arax's user avatar
  • 223
1 vote
1 answer
1k views

Why is CO2 considered a greenhouse gas? Can you explain the principles? [closed]

I think the title says it all...
C_R_O_M________ C_R_O_M_______'s user avatar
3 votes
0 answers
152 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 * ...
Ather Cheema's user avatar
2 votes
1 answer
119 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 ...
orome's user avatar
  • 121
5 votes
2 answers
423 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 ...
Marcel H.'s user avatar
-2 votes
1 answer
178 views

What portion of global warming is caused by radioactive CO2 produced from cosmic rays?

The Earth's magentic field has been weaking recently, and the sun's magnetic field has been weaking recently, and it is a known fact that when either of these magnetic fields weaken (let alone both of ...
The Jaq's user avatar
  • 13
4 votes
2 answers
939 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 ...
MattGeo's user avatar
  • 303
6 votes
1 answer
179 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? ...
Bhoutik Shastri's user avatar
5 votes
0 answers
58 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 ...
AtmosphericPrisonEscape's user avatar
6 votes
1 answer
3k 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 ...
Han Zhengzu's user avatar
  • 2,459
2 votes
2 answers
839 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 ...
cr0's user avatar
  • 1,178
6 votes
2 answers
1k 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. ...
Abigal Peters's user avatar
6 votes
2 answers
6k 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 ...
Camilo Rada's user avatar
  • 17.6k
3 votes
1 answer
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: ...
yre's user avatar
  • 485
1 vote
1 answer
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 ...
yre's user avatar
  • 485
0 votes
1 answer
174 views

Does being in the air provide any protection from an asteroid?

How does radiation and shock waves from a radioactive asteroid or atomic explosion disperse throughout Earth's atmosphere? Are there specific areas on Earth that are less likely to receive the shock ...
Muze's user avatar
  • 1
1 vote
0 answers
27 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 ...
yre's user avatar
  • 485
10 votes
2 answers
765 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). ...
Camilo Rada's user avatar
  • 17.6k
2 votes
1 answer
104 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 ...
jirikadlec2's user avatar
3 votes
1 answer
795 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 ...
Windy Day's user avatar
3 votes
1 answer
165 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 ...
uhoh's user avatar
  • 7,096
5 votes
4 answers
853 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 ...
rclev's user avatar
  • 151