Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-6041-2017 |
Comparison of AOD, AAOD and column single scattering albedo from AERONET retrievals and in situ profiling measurements | |
Andrews, Elisabeth1; Ogren, John A.2; Kinne, Stefan3; Samset, Bjorn4 | |
2017-05-16 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany; Norway |
英文摘要 | Here we present new results comparing aerosol optical depth (AOD), aerosol absorption optical depth (AAOD) and column single scattering albedo (SSA) obtained from in situ vertical profile measurements with AERONET ground-based remote sensing from two rural, continental sites in the US. The profiles are closely matched in time (within +/- 3 h) and space (within 15 km) with the AERONET retrievals. We have used Level 1.5 inversion retrievals when there was a valid Level 2 almucantar retrieval in order to be able to compare AAOD and column SSA below AERONET's recommended loading constraint (AOD> 0.4 at 440 nm). While there is reasonable agreement for the AOD comparisons, the direct comparisons of in situ-derived to AERONET-retrieved AAOD (or SSA) reveal that AERONET retrievals yield higher aerosol absorption than obtained from the in situ profiles for the low aerosol optical depth conditions prevalent at the two study sites. However, it should be noted that the majority of SSA comparisons for AOD(440) > 0.2 are, nonetheless, within the reported SSA uncertainty bounds. The observation that, relative to in situ measurements, AERONET inversions exhibit increased absorption potential at low AOD values is generally consistent with other published AERONET-in situ comparisons across a range of locations, atmospheric conditions and AOD values. This systematic difference in the comparisons suggests a bias in one or both of the methods, but we cannot assess whether the AERONET retrievals are biased towards high absorption or the in situ measurements are biased low. Based on the discrepancy between the AERONET and in situ values, we conclude that scaling modeled black carbon concentrations upwards to match AERONET retrievals of AAOD should be approached with caution as it may lead to aerosol absorption overestimates in regions of low AOD. Both AERONET retrievals and in situ measurements suggest there is a systematic relationship between SSA and aerosol amount (AOD or aerosol light scattering)-specifically that SSA decreases at lower aerosol loading. This implies that the fairly common assumption that AERONET SSA values retrieved at high-AOD conditions can be used to obtain AAOD at low-AOD conditions may not be valid. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401432200005 |
WOS关键词 | AEROSOL OPTICAL-PROPERTIES ; SOUTHERN GREAT-PLAINS ; LIGHT-ABSORPTION MEASUREMENTS ; SKY RADIANCE MEASUREMENTS ; FILTER-BASED MEASUREMENTS ; ATMOSPHERIC BLACK CARBON ; MID-ATLANTIC COAST ; VERTICAL PROFILES ; RADIATIVE PROPERTIES ; BROWN CARBON |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30797 |
专题 | 地球科学 |
作者单位 | 1.Univ Colorado, CIRES, Boulder, CO 80309 USA; 2.NOAA, ESRL, GMD, Boulder, CO 80305 USA; 3.Max Planck Inst Meteorol, D-20146 Hamburg, Germany; 4.CICERO, N-0349 Oslo, Norway |
推荐引用方式 GB/T 7714 | Andrews, Elisabeth,Ogren, John A.,Kinne, Stefan,et al. Comparison of AOD, AAOD and column single scattering albedo from AERONET retrievals and in situ profiling measurements[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(9). |
APA | Andrews, Elisabeth,Ogren, John A.,Kinne, Stefan,&Samset, Bjorn.(2017).Comparison of AOD, AAOD and column single scattering albedo from AERONET retrievals and in situ profiling measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(9). |
MLA | Andrews, Elisabeth,et al."Comparison of AOD, AAOD and column single scattering albedo from AERONET retrievals and in situ profiling measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.9(2017). |
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