Taklimakan Desert nocturnal low-level jet: climatology and dust activity
Taklimakan Desert nocturnal low-level jet: climatology and dust activity
复制标题
塔克拉玛干沙漠夜间低空急流：气候学和沙尘活动
DOI：
10.5194/acp-16-7773-2016
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发表时间：
2016-06
影响因子：
6.3
通讯作者：
Fu, Qiang
中科院分区：
文献类型：
--
作者：
Ge, Jin Ming;Liu, Huayue;Huang, Jianping;Fu, Qiang
抽象的。虽然夜间低空急流(NLLJ)在世界许多地区频繁发生，但塔克拉玛干沙漠(TD)上空NLLJ的出现和其他详细特征尚不为人所知。本文通过对多年ERA-中期再分析和卫星观测资料的分析，给出了TD上空NLLJ和重合沙尘的气候学特征。通过与两个地面探空资料的比较发现，ERA-TIMAL数据集能够很好地捕捉到NLLJs的特征。NLLJ出现在60 %以上的夜间，主要是偏东至东北偏东方向。它们通常出现在距地面100~400 m的高空，速度为4~10 m S−1。在暖季，它们大多位于夜间逆温层上方，而在冷季，它们则嵌在逆温层中。逆温层以上的NLLJ具有较强的年周期，最大频率出现在8月份。我们还量化了对流边界层(CBL)的高度，并构造了一个指数来衡量CBL中的动量大小。我们发现，在低层大气中，NLLJ个例的动量大小比非NLLJ个例大，暖季下沉的动量输送过程更强烈、更迅速。在夏季和秋季，NLLJ核心以下到沙漠表面的风增强，这些风与气溶胶光学厚度的增强相一致。这表明，NLLJ是塔克拉玛干暖季沙尘活动和输送的重要机制。
Abstract. While nocturnal low-level jets (NLLJs) occur frequently in many parts of the world, the occurrence and other detailed characteristics of NLLJs over the Taklimakan Desert (TD) are not well known. This paper presents a climatology of NLLJs and coincident dust over the TD by analyzing multi-year ERA-Interim reanalysis and satellite observations. It is found that the ERA-Interim dataset can capture the NLLJs' features well by comparison with radiosonde data from two surface sites. The NLLJs occur in more than 60 % of nights, which are primarily easterly to east-northeasterly. They typically appear at 100 to 400 m above the surface with a speed of 4 to 10 m s−1. Most NLLJs are located above the nocturnal inversion during the warm season, while they are embedded in the inversion layer during the cold season. NLLJs above the inversion have a strong annual cycle with a maximum frequency in August. We also quantify the convective boundary layer (CBL) height and construct an index to measure the magnitude of the momentum in the CBL. We find that the magnitude of momentum in the lower atmosphere from the top of the surface layer to the top of mixed layer is larger for NLLJ cases than for non-NLLJ cases, and in the warm season the downward momentum transfer process is more intense and rapid. The winds below the NLLJ core to the desert surface gain strength in summer and autumn, and these summer and autumn winds are coincident with an enhancement of aerosol optical depth. This indicates that the NLLJ is an important mechanism for dust activity and transport during the warm season over the Taklimakan.
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影响因子：
5.2
作者：
Xiaoye Zhang;S. Gong;S. Gong;T. L. Zhao;R. Arimoto;Yaqiang Wang;Z. J. Zhou
通讯作者：
Xiaoye Zhang;S. Gong;S. Gong;T. L. Zhao;R. Arimoto;Yaqiang Wang;Z. J. Zhou
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DOI：
10.1016/j.jqsrt.2009.03.010
发表时间：
2009-09
影响因子：
2.3
作者：
Su, J.;Thorsen, T. J.;Ge, J. M.;Fu, Q.;Huang, J. P.
通讯作者：
Huang, J. P.
影响因子：
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作者：
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影响因子：
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作者：
Ge, J. M.;Huang, J. P.;Fu, Q.
通讯作者：
Fu, Q.
影响因子：
18.3
作者：
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通讯作者：
Sugimoto, Nobuo