Distribution of light-absorbing impurities in snow of glacier on Mt. Yulong, southeastern Tibetan Plateau
Distribution of light-absorbing impurities in snow of glacier on Mt. Yulong, southeastern Tibetan Plateau
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青藏高原东南部玉龙山冰川雪中吸光杂质的分布
DOI：
10.1016/j.atmosres.2017.07.004
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发表时间：
2017-11
影响因子：
5.5
通讯作者：
Gang Li
中科院分区：
文献类型：
--
作者：
Hewen Niu;Shichang Kang;Yulan Zhang;Xiaoyi Shi;Xiaofei Shi;Shijin Wang;Gang Li
冰川表面积雪中的不溶性吸光杂质（ILAIs）降低了积雪反照率，加速了冰川融化。为了评估ILAIs对冰川融化的影响，我们首先从实地测量中获得了ILAIs的结果，包括山冰川积雪中的黑碳（BC）和尘埃。计算了积雪中BC和尘埃浓度的放大因子，并估计了ILAIs对融水清除率、雪光谱反照率和相关辐射强迫（RF）的影响。熔体放大通常局限于积雪顶部几厘米，我们的结果表明，BC比其他不溶性光吸收剂（如灰尘）更有效地被融水清除。随着颗粒半径（re）的增大，杂质的吸收对雪光谱反照率的影响更大。利用冰雪气溶胶辐射（SNICAR）模式研究了光谱反照率的降低。与re= 200 μm雪相比，re= 500雪对1200 ng g−1 BC的反照率降低0.075。如果积雪中只有粉尘（51.37 ppm）为杂质，则光谱反照率降低仅为0.03，相关RF为42.76 W m−2。在BC和尘埃混合的情况下，光谱反照率显著降低（0.11±0.03），相关的RF （145.23 W m−2）是尘埃混合情况下的3倍以上。积雪中的BC是控制积雪反照率和雪冰RF的主动因子。需要进一步的观测研究来量化BC和粉尘对反照率降低和冰川融化的贡献，并表征冰川RF的变化。
Insoluble light-absorbing impurities (ILAIs) in surface snow of glacier reduce snow albedo and accelerate glacier melt. In order to assess effects of ILAIs on glacier melt, we present the first results from field measurements of ILAIs, including black carbon (BC) and dust in snowpacks of glacier on Mt. Yulong, southeastern Tibetan Plateau (TP). Amplification factors because of snow melt were calculated for BC and dust concentrations in surface snow, and melt scavenging rates, effects of ILAIs on snow spectral albedo, and associated radiative forcing (RF) were estimated. Melt amplification generally appeared to be confined to the top few centimeters of the snowpack, and our results indicated that BC was more efficiently scavenged with meltwater than the other insoluble light-absorbers (e.g., dust). Absorbing impurities reduced snow spectral albedo more with larger particulate grain radius (re). Spectral albedo reduction was investigated using the SNow ICe Aerosol Radiative (SNICAR) model. Albedo reduction for 1200 ng g− 1of BC in Mt. Yulong snow was 0.075 for snow withre= 500 compared withre= 200 μm. If dust (51.37 ppm) was the only impurity in the snowpack, the spectral albedo reduction would be only 0.03, and the associated RF was 42.76 W m− 2. For a BC and dust mixed scenario, the spectral albedo was substantially reduced (0.11 ± 0.03), and the associated RF (145.23 W m− 2) was more than three times larger than that for the dust-only scenario. BC in snow is an active factor controlling snow albedo and snow-ice RF. Further observational studies are needed to quantify the contribution of BC and dust to albedo reduction and glacier melt and to characterize the variation of glacier RF.
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DOI：
10.1016/j.scitotenv.2017.01.032
发表时间：
2017-03
期刊：
The Science of the total environment
影响因子：
--
作者：
H. Niu;Shi-chang Kang;Xiaofei Shi;Rukumesh Paudyal;Yuanqing He;Gang Li;Shijin Wang;T. Pu;
通讯作者：
H. Niu;Shi-chang Kang;Xiaofei Shi;Rukumesh Paudyal;Yuanqing He;Gang Li;Shijin Wang;T. Pu;
影响因子：
6.9
作者：
J. Ming;Pengling Wang;Shuyu Zhao;Pengfei Chen
通讯作者：
J. Ming;Pengling Wang;Shuyu Zhao;Pengfei Chen
影响因子：
30.7
作者：
Hadley, Odelle L.;Kirchstetter, Thomas W.
通讯作者：
Kirchstetter, Thomas W.
影响因子：
3.8
作者：
Schwarz, J. P.;Doherty, S. J.;Fahey, D. W.
通讯作者：
Fahey, D. W.
影响因子：
3.1
作者：
Wei‐Chyung Wang;J. Pinto;Y. Yung
通讯作者：
Wei‐Chyung Wang;J. Pinto;Y. Yung