دورية أكاديمية
Mid-summer snow-free albedo across the Arctic tundra was mostly stable or increased over the past two decades
| العنوان: | Mid-summer snow-free albedo across the Arctic tundra was mostly stable or increased over the past two decades |
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| المؤلفون: | Elena Plekhanova, Jin-Soo Kim, Jacqueline Oehri, Angela Erb, Crystal Schaaf, Gabriela Schaepman-Strub |
| المصدر: | Environmental Research Letters, Vol 17, Iss 12, p 124026 (2022) |
| بيانات النشر: | IOP Publishing, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Environmental technology. Sanitary engineering LCC:Environmental sciences LCC:Science LCC:Physics |
| مصطلحات موضوعية: | albedo, Arctic, tundra, vegetation, spectral albedo, climate models, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350, Science, Physics, QC1-999 |
| الوصف: | Arctic vegetation changes, such as increasing shrub-cover, are expected to accelerate climate warming through increased absorption of incoming radiation and corresponding decrease in summer shortwave albedo. Here we analyze mid-summer shortwave land-surface albedo and its change across the pan-Arctic region based on MODerate resolution Imaging Spectroradiometer satellite observations over the past two decades (2000–2021). In contrast to expectations, we show that terrestrial mid-summer shortwave albedo has not significantly changed in 82% of the pan-Arctic region, while 14% show an increase and 4% a decrease. The total median significant change was 0.014 over the past 22 years. By analyzing the visible and near-/shortwave-infrared range separately, we demonstrate that the slight increase arises from an albedo increase in the near-/shortwave infrared domain while being partly compensated by a decrease in visible albedo. A similar response was found across different tundra vegetation types. We argue that this increase in reflectance is typical with increasing biomass as a result of increased multiple reflection in the canopy. However, CMIP6 global land surface model albedo predictions showed the opposite sign and different spatial patterns of snow-free summer albedo change compared to satellite-derived results. We suggest that a more sophisticated vegetation parametrization might reduce this discrepancy, and provide albedo estimates per vegetation type. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1748-9326 |
| Relation: | https://doaj.org/toc/1748-9326 |
| DOI: | 10.1088/1748-9326/aca5a1 |
| URL الوصول: | https://doaj.org/article/3802875c974a4a5fbe12ebea53b84b63 |
| رقم الأكسشن: | edsdoj.3802875c974a4a5fbe12ebea53b84b63 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 17489326 |
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| DOI: | 10.1088/1748-9326/aca5a1 |