The TROPOMI surface UV algorithm

Lindfors, Anders V.; Kujanpää, Jukka; Kalakoski, Niilo; Heikkilä, Anu; Lakkala, Kaisa; Mielonen, Tero; Sneep, Maarten; Krotkov, Nickolay A.; Arola, Antti; Tamminen, J.

doi:10.5194/amt-11-997-2018

Cited by 32 publications

(29 citation statements)

References 48 publications

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“…The OMI was a significant improvement from previous satellite-based instruments such as the TOMS (Total Ozone Mapping Spectrometer), GOME (Global Ozone Monitoring Experiment), and SCIAMACHY (SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY) with improved spatial resolution as well as the vastly increased number of wavelengths. The OMI UV product covers the years from 2004 to the present and is currently foreseen to last for at least a few more years [8].…”

Section: Satellite-derived Uvi From Omi Auramentioning

confidence: 99%

“…UV irradiance increases with increasing altitude due to a thinner atmosphere that scatters and absorbs the radiation, and lesser anthropogenic aerosols which are usually limited to lower altitudes. The earth-sun distance which varies throughout the year also affects the incoming UV, with higher UV irradiance during the summer months [8] The UV radiation comprises of three broadband regions; UVC from 100 to 280 nm, UVB from 280 to 315 nm, and UVA from 320 to 400 nm (Figure 1). UVA radiation is predominantly not absorbed by atmospheric aerosols or living organisms while almost all of UVC radiation is absorbed by the Huggins-Hartley system of ozone and the Schumann-Runge systems (70-200 nm) of molecular oxygen.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is important for people to control their exposure to UV radiation [1,6].The UV radiation on the Earth's surface is largely determined by the solar zenith angle, clouds, total ozone column, surface albedo, aerosols, earth-sun distance, and altitude [7]. Clouds poorly absorb UV radiation and in general, scatter UV radiation into the atmosphere [8,9]. Stratospheric ozone (ozone layer) predominantly absorbs UV radiation at wavelengths below 320 nm [10].…”

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confidence: 99%

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confidence: 99%

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UV Index Forecasting under the Influence of Desert Dust: Evaluation against Surface and Satellite-Retrieved Data

et al. 2020

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Human exposure to healthy doses of UV radiation is required for vitamin D synthesis, but exposure to excessive UV irradiance leads to several harmful impacts ranging from premature wrinkles to dangerous skin cancer. However, for countries located in the global dust belt, accurate estimation of the UV irradiance is challenging due to a strong impact of desert dust on incoming solar radiation. In this work, a UV Index forecasting capability is presented, specifically developed for dust-rich environments, that combines the use of ground-based measurements of broadband irradiances UVA (320-400 nm) and UVB (280-315 nm), NASA OMI Aura satellite-retrieved data and the meteorology-chemistry mesoscale model WRF-Chem. The forecasting ability of the model is evaluated for clear sky days as well as during the influence of dust storms in Doha, Qatar. The contribution of UV radiation to the total incoming global horizontal irradiance (GHI) ranges between 5% and 7% for UVA and 0.1% and 0.22% for UVB. The UVI forecasting performance of the model is quite encouraging with an absolute average error of less than 6% and a correlation coefficient of 0.93. In agreement with observations, the model predicts that the UV Index at local noontime can drop from 10-11 on clear sky days to approximately 6-7 during typical dusty conditions in the Arabian Peninsula-an effect similar to the presence of extensive cloud cover.Atmosphere 2020, 11, 96 2 of 17 photokeratitis (inflammation of the cornea), and suppression of the immune system [1,[3][4][5]. Thus, it is important for people to control their exposure to UV radiation [1,6].The UV radiation on the Earth's surface is largely determined by the solar zenith angle, clouds, total ozone column, surface albedo, aerosols, earth-sun distance, and altitude [7]. Clouds poorly absorb UV radiation and in general, scatter UV radiation into the atmosphere [8,9]. Stratospheric ozone (ozone layer) predominantly absorbs UV radiation at wavelengths below 320 nm [10]. The extent of reflectivity from a surface affects UV surface irradiance with higher surface albedo enhancing the net UV surface irradiance due to multiple scattering of the reflected irradiance with the atmosphere. For example, a surface covered by snow (with albedo of 0.8) will increase UV irradiance at 320 nm by 1.5 times compared to snow-free, low albedo conditions [11]. Aerosols also affect the incoming UV irradiance. They usually decrease UV irradiance reaching the surface by scattering and absorption. A measurement campaign in Greece showed that UV irradiance decreased by 5-35% due to aerosols [12], and similar numbers of annual average aerosol attenuation of UV irradiance were obtained around the globe [13]. Desert dust intrusions also affect UV irradiance with differences larger than 30% in cloudless conditions in Santiago de Chile [14,15]. These differences in UV irradiance highlight the need for ground-based measurements to account for the attenuation of UV radiation in the troposphere which are not accounted for in satellite derived es...

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Section: Satellite-derived Uvi From Omi Auramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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UV Index Forecasting under the Influence of Desert Dust: Evaluation against Surface and Satellite-Retrieved Data

et al. 2020

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“…In addition, these high-quality measurements can be used for validation of satellite data, e.g., validation of UV products based on TROPOMI measurements on board the Sentinel-5 Precursor satellite (Lindfors et al, 2018). They are highly valuable, as the ground based measurement network is very sparse at high latitudes.…”

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confidence: 99%

New continuous total ozone, UV, VIS and PAR measurements at Marambio 64° S, Antarctica

Lakkala¹,

Aun²,

Sánchez³

et al. 2019

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A GUV multifilter radiometer was set up at Marambio, 64 • S 56 • W, Antarctica, in 2017. The instrument measures continuously ultraviolet (UV) radiation, visible (VIS) radiation and photosynthetically active radiation (PAR). The measurements are designed for providing high quality long-term time series which can be used to assess the impact of global climate change in the Antarctic region. The quality assurance includes regular absolute calibrations and solar comparisons performed at the site and at Sodankylä, Finland. The actual measurements continue the time series measured at Marambio with NILU-5UV radiometers during 2000-2010 as part of the Antarctic NILU-UV network. They are optimal for assessing the effects of the ongoing stratospheric ozone recovery on the ecosystem as the data products include information on radiation at various wavelengths ranging from UV to VIS so that changes on biologically effective radiation due to ozone can be separated from those due to other factors. The final data products are total ozone, PAR, VIS radiation at 555 nm, UV index, UV irradiance at 5 channels, UVB and UVA dose rate/daily dose, and biologically weighted UV dose rate/ daily dose, including 10 different 10 action spectra. The data from the last five days and the daily maximum UV index time series are plotted and updated daily on the web page fmiarc.fmi.fi/sub_sites/GUVant/. The first two years of UV measurements were very different in terms of the results: The monthly average of daily maximum UVB dose rates were clearly higher in 2018 than in 2017 during the period from October to December. The largest difference was observed in October, when the average of daily maximum UVB dose rates was 7.6 kWm −2 and 10.2 kWm −2 in 2017 and 2018, respectively. The monthly averages were close to each other for all 15

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Record-Breaking Increases in Arctic Solar Ultraviolet Radiation Caused by Exceptionally Large Ozone Depletion in 2020

Bernhard

Fioletov

Grooß

et al. 2020

Preprint

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Measurements of solar ultraviolet radiation (UVR) performed between January and June 2020 at 10 Arctic and subarctic locations are compared with historical observations. Differences between 2020 and prior years are also assessed with total ozone column and UVR data from satellites. Erythemal (sunburning) UVR is quantified with the UV Index (UVI) derived from these measurements. UVI data show unprecedently large anomalies, occurring mostly between early March and mid-April 2020. For several days, UVIs observed in 2020 exceeded measurements of previous years by up to 140%. Historical means were surpassed by more than six standard deviations at several locations in the Arctic. In northern Canada, the average UVI for March was about 75% larger than usual. UVIs in April 2020 were elevated on average by about 25% at all sites. However, absolute anomalies remained below 3.0 UVI units because the enhancements occurred during times when the solar elevation was still low. Plain Language SummaryThe ultraviolet radiation (UVR) from the Sun depends on the amount of ozone in the atmosphere. During March and April 2020, ozone concentrations in the Arctic atmosphere were exceptionally low and this led to large increases in UV radiation at the surface. These increases were quantified by analyzing data from ground-based instruments at 10 Arctic and subarctic locations, as well as satellite data. UV levels were quantified with the UV Index (UVI), which measures the amount of "sunburning" UVR. The greatest UVI increases were observed between early March and mid-April 2020. For several days, UVIs observed in 2020 exceeded measurements of previous years by up to 140%. In northern Canada, the average UVI for March was about 75% larger than usual. UVIs in April 2020 were elevated on average by about 25%. However, these large relative anomalies occurred early in the year when the Sun is still low in the sky. UVI increases remained therefore small in absolute terms and did not exceed typical summertime UVI values under clear skies.

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The TROPOMI surface UV algorithm

Cited by 32 publications

References 48 publications

UV Index Forecasting under the Influence of Desert Dust: Evaluation against Surface and Satellite-Retrieved Data

UV Index Forecasting under the Influence of Desert Dust: Evaluation against Surface and Satellite-Retrieved Data

New continuous total ozone, UV, VIS and PAR measurements at Marambio 64° S, Antarctica

Record-Breaking Increases in Arctic Solar Ultraviolet Radiation Caused by Exceptionally Large Ozone Depletion in 2020

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