Variation of Spectral Radiance of the Zenith Sky During the Annular Eclipse on May 21, 2012

Suzuki, Hidehiko; Yamamoto, Akihiro

doi:10.1007/s11038-013-9416-4

Cited by 1 publication

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“…Visible irradiance dropped to ~7 % (Figure 3a). Due to the spectral dependence of limb darkening there is a proportionally more pronounced decrease of radiation at shorter wavelengths (Kazadzis et al, 2007;Suzuki and Yamamoto, 2013), with the loss in UV-B irradiance at 310 nm being as much as 60% more than for a hypothetical sun (Koepke et al, 2001). This implies a probable larger drop for the UV wavelength window of j(NO 2 ) (than to the 7% seen in the visible wavelength data).…”

Section: Factors Driving the Trace Gas Behavior On The Eclipse Daymentioning

confidence: 99%

Contrasting behavior of slow and fast photoreactive gases during the August 21, 2017, solar eclipse

Helmig

Blanchard

Hueber

2018

Elementa: Science of the Anthropocene

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The total solar eclipse on August 21, 2017, provided a rare opportunity to observe and test our understanding of atmospheric dynamics and photochemical dependency on solar irradiance. Here, we utilize observations from the continuous monitoring of both inert and photoreactive trace gases near Boulder, Colorado, for contrasting the unique dynamic and photochemical forcings on the eclipse day. The monitoring station saw a 93% solar obstruction during the peak of the eclipse. Eclipse day data are contrasted with the full month's record from this site. The loss of irradiance caused cooling of the surface air by ~3oC, and weakened convective and tur-bulent mixing. This resulted in a buildup of non-reactive gases (methane, volatile organic com-pounds) as well as nitrogen oxides (NO, NO2) in the surface layer. In contrast, ozone (O3) de-clined by ~15 ppb during the first part of the eclipse compared to median August diurnal mixing ratios. Similar O3 signatures were observed at a series of network stations along the Northern Colorado Front Range. With the loss of irradiance, the initial ratio of NO/(NO+NO2) of ~0.2 dropped steadily, bottoming out at <0.01, but rebounded to ~50% above average levels towards the end of the eclipse. Above average O3 enhancements were seen in the afternoon hours fol-lowing the eclipse. The contrasting behavior of reactive and non-reactive gases, and compari-son with other published eclipse data, allow characterizing these responses as urban/polluted behavior.

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Section: Factors Driving the Trace Gas Behavior On The Eclipse Daymentioning

confidence: 99%

Contrasting behavior of slow and fast photoreactive gases during the August 21, 2017, solar eclipse

Helmig

Blanchard

Hueber

2018

Elementa: Science of the Anthropocene

View full text Add to dashboard Cite

show abstract

Variation of Spectral Radiance of the Zenith Sky During the Annular Eclipse on May 21, 2012

Cited by 1 publication

References 8 publications

Contrasting behavior of slow and fast photoreactive gases during the August 21, 2017, solar eclipse

Contrasting behavior of slow and fast photoreactive gases during the August 21, 2017, solar eclipse

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