Solar ultraviolet irradiance for clear sky days incident at Rosario, Argentina: Measurements and model calculations

2002 ◽  
Vol 107 (D15) ◽  
Author(s):  
R. D. Piacentini
Keyword(s):  
Model Calculations ◽  
Clear Sky ◽  
Ultraviolet Irradiance ◽  
Solar Ultraviolet

scholarly journals Direct solar ultraviolet irradiance over Nainital, India, in the central Himalayas for clear-sky day conditions during December 2004

2006 ◽  
Vol 111 (D8) ◽  
Author(s):  
Manoj K Srivastava ◽  
Sachchidanand Singh ◽  
Auromeet Saha ◽  
U. C. Dumka ◽  
Prashant Hegde ◽  
...  
Keyword(s):  
Central Himalayas ◽  
Clear Sky ◽  
Ultraviolet Irradiance ◽  
Solar Ultraviolet

Solar ultraviolet irradiance observed from southern Argentina: September 1990 to March 1991

1993 ◽  
Vol 98 (D5) ◽  
pp. 8891-8897 ◽  
Author(s):  
J. E. Frederick ◽  
P. F. Soulen ◽  
S. B. Diaz ◽  
I. Smolskaia ◽  
C. R. Booth ◽  
...  
Keyword(s):  
Ultraviolet Irradiance ◽  
Solar Ultraviolet

scholarly journals Comparison of UV climates at Summit, Greenland; Barrow, Alaska and South Pole, Antarctica

2008 ◽  
Vol 8 (2) ◽  
pp. 4949-4976
Author(s):  
G. Bernhard ◽  
C. R. Booth ◽  
J. C. Ehramjian
Keyword(s):  
Total Ozone ◽  
Surface Albedo ◽  
High Surface ◽  
Lower Latitude ◽  
South Pole ◽  
Model Calculations ◽  
Uv Index ◽  
Ice Caps ◽  
Clear Sky ◽  
Summer Maximum

Abstract. An SUV-150B spectroradiometer for measuring solar ultraviolet (UV) irradiance was installed at Summit, Greenland, in August 2004. Here we compare the initial data from this new location with similar measurements from Barrow, Alaska and South Pole. Measurements of irradiance at 345 nm performed at equivalent solar zenith angles (SZAs) are almost identical at Summit and South Pole. The good agreement can be explained with the similar location of the two sites on high-altitude ice caps with high surface albedo. Clouds have little impact at both sites, but can reduce irradiance at Barrow by more than 75%. Clear-sky measurements at Barrow are smaller than at Summit by 14% in spring and 36% in summer, mostly due to differences in surface albedo and altitude. Comparisons with model calculations indicate that aerosols can reduce clear-sky irradiance at 345 nm by 4–6%; aerosol influence is largest in April. Differences in total ozone at the three sites have a large influence on the UV Index. At South Pole, the UV Index is on average 20–80% larger during the ozone hole period than between January and March. At Summit, total ozone peaks in April and UV Indices in spring are on average 10–25% smaller than in the summer. Maximum UV Indices ever observed at Summit and South Pole are 6.7 and 4.0, respectively. The larger value at Summit is due to the site's lower latitude. For comparable SZAs, average UV Indices measured during October and November at South Pole are 1.9–2.4 times larger than measurements during March and April at Summit. Average UV Indices at Summit are over 50% greater than at Barrow because of the larger cloud influence at Barrow.

scholarly journals Toward a Consistent Definition between Satellite and Model Clear-Sky Radiative Fluxes

2020 ◽  
Vol 33 (1) ◽  
pp. 61-75 ◽  
Author(s):  
Norman G. Loeb ◽  
Fred G. Rose ◽  
Seiji Kato ◽  
David A. Rutan ◽  
Wenying Su ◽  
...  
Keyword(s):  
Tropical Pacific ◽  
Radiative Effect ◽  
The West ◽  
Model Calculations ◽  
Radiative Fluxes ◽  
Clear Sky ◽  
Cloud Radiative Effect ◽  
Adjustment Factors ◽  
The Impact ◽  
Global Mean

AbstractA new method of determining clear-sky radiative fluxes from satellite observations for climate model evaluation is presented. The method consists of applying adjustment factors to existing satellite clear-sky broadband radiative fluxes that make the observed and simulated clear-sky flux definitions more consistent. The adjustment factors are determined from the difference between observation-based radiative transfer model calculations of monthly mean clear-sky fluxes obtained by ignoring clouds in the atmospheric column and by weighting hourly mean clear-sky fluxes with imager-based clear-area fractions. The global mean longwave (LW) adjustment factor is −2.2 W m−2 at the top of the atmosphere and 2.7 W m−2 at the surface. The LW adjustment factors are pronounced at high latitudes during winter and in regions with high upper-tropospheric humidity and cirrus cloud cover, such as over the west tropical Pacific, and the South Pacific and intertropical convergence zones. In the shortwave (SW), global mean adjustment is 0.5 W m−2 at TOA and −1.9 W m−2 at the surface. It is most pronounced over sea ice off of Antarctica and over heavy aerosol regions, such as eastern China. However, interannual variations in the regional SW and LW adjustment factors are small compared to those in cloud radiative effect. After applying the LW adjustment factors, differences in zonal mean cloud radiative effect between observations and climate models decrease markedly between 60°S and 60°N and poleward of 65°N. The largest regional improvements occur over the west tropical Pacific and Indian Oceans. In contrast, the impact of the SW adjustment factors is much smaller.

Balloon observations of solar ultraviolet irradiance at solar minimum

1982 ◽  
Vol 30 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Paul C. Simon ◽  
Roger Pastiels ◽  
Dennis Nevejans
Keyword(s):  
Solar Minimum ◽  
Ultraviolet Irradiance ◽  
Solar Ultraviolet

scholarly journals Fossil pollen and spores as a tool for reconstructing ancient solar-ultraviolet irradiance received by plants: an assessment of prospects and challenges using proxy-system modelling

2019 ◽  
Vol 18 (2) ◽  
pp. 275-294 ◽  
Author(s):  
Alistair W. R. Seddon ◽  
Daniela Festi ◽  
T. Matthew Robson ◽  
Boris Zimmermann
Keyword(s):  
Systematic Evaluation ◽  
Fossil Pollen ◽  
System Modelling ◽  
Pollen And Spores ◽  
Ultraviolet Irradiance ◽  
Solar Ultraviolet

A systematic evaluation of the uncertainties limiting the application of UV-B-absorbing compounds in pollen and spores to reconstruct UV-B irradiance.

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