期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 117, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2011JD016630
关键词
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资金
- NERC [NE/F010788/1, NE/F004796/1]
- NERC FSF [555.0608]
- RHUL
- NERC [NE/F010788/1, fsf010001, NE/F004796/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F010788/1, NE/F004796/1, fsf010001] Funding Source: researchfish
The contribution of snow photochemistry to snow and atmospheric oxidative capacity is controlled, in part, by snow albedo and e-folding depths in snow. Albedo and e-folding depths (and thus snow photochemistry) are a function of black carbon concentration in snow. The paper presented here demonstrates the complicated response of albedo, e-folding depth (wavelengths 300-600 nm) and depth-integrated production rates of NO2 and OH radicals to increasing black carbon concentration in well-characterized snowpacks of the Barrow OASIS campaign, Alaska. All snowpacks were reworked layered windpacks and were found to have similar responses to changes in black carbon concentration. The radiative-transfer calculations demonstrate two light absorption regimes: ice-dominated and black carbon dominated. The ice-dominated and black carbon dominated behavior of albedo, e-folding depth and depth-integrated production rates with increasing black carbon concentrations are presented. For black carbon concentrations greater than 20 ng g(-1) (wavelength range of 300-600 nm), e-folding depth and depth-integrated production rate have an inverse power law relationship with black carbon concentration. Doubling the black carbon concentration decreases the e-folding depth to similar to 70% of the initial value and for solar zenith angles greater than 60 degrees, doubling the black carbon concentration decreases depth-integrated production rates of NO2 and OH to similar to 70% and similar to 65% of their original values respectively.
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