A 1-year long delta O-18 record of water vapor in Niamey (Niger) reveals insightful atmospheric processes at different timescales
A 1-year long delta O-18 record of water vapor in Niamey (Niger) reveals insightful atmospheric processes at different timescales
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尼亚美（尼日尔）长达一年的 Delta O-18 水蒸气记录揭示了不同时间尺度的深刻大气过程
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
G. Favreau
中科院分区：
文献类型：
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作者：
G. Tremoy;F. Vimeux;Salla Mayaki;Ide Souley;Olivier;Cattani;C. Risi;G. Favreau
[1]我们利用波长扫描腔环形谱(WS-CRDS)给出了尼日尔尼亚美(Niamey)长达一年的具有代表性的d18O水汽记录(D18Ov)。我们探讨了局地和区域大气过程如何影响从季节尺度到日尺度的d18Ov变率。在季节尺度上，d18Ov呈W型，与季风期间区域对流活动增强和旱季尼亚美以北大范围下沉加剧有关。在季风季，d18Ov在25-40天和15-25天频段记录了广泛的季节内模式，这可能与西非季风(WAM)的众所周知的模式有关。冬季在天气尺度(5-9天)也可以看到较强的d18Ov调制，这是由于热带-热带外的遥相关通过斜压波列结构的传播和来自高海拔和高纬度的空气的入侵而驱动的。D18Ov还表现出明显的日循环，反映了旱季边界层与自由大气的混合过程，并记录了季风季与中尺度对流系统有关的密度流的传播。引用：G.，F.Vimeux，S.I.O.Cattani，C.Risi，G.Favreau和M.Oi(2012)，一份长达一年的长达18O的尼亚美水汽记录揭示了不同时间尺度的大气过程，地球物理。莱特资源。，39，L08805，
[ 1 ] We present a 1-year long representative d 18 O record of water vapor ( d 18 O v ) in Niamey (Niger) using the Wavelength Scanned-Cavity Ring Down Spectroscopy (WS-CRDS). We explore how local and regional atmospheric processes influence d 18 O v variability from seasonal to diurnal scale. At seasonal scale, d 18 O v exhibits a W-shape, associated with the increase of regional convective activity during the monsoon and the intensification of large scale subsidence North of Niamey during the dry season. During the monsoon season, d 18 O v records a broad range of intra-seasonal modes in the 25 – 40-day and 15 – 25-day bands that could be related to the well-known modes of the West African Monsoon (WAM). Strong d 18 O v modulations are also seen at the synoptic scale (5 – 9 days) during winter, driven by tropical-extra-tropical teleconnections through the propagation of a baroclinic wave train-like structure and intrusion of air originating from higher altitude and latitude. d 18 O v also reveals a significant diurnal cycle, which reflects mixing process between the boundary layer and the free atmosphere during the dry season, and records the propagation of density currents associated with meso-scale convective systems during the monsoon season. Citation: G., F. Vimeux, S. I. O. Cattani, C. Risi, G. Favreau, and M. Oi (2012), A 1-year long d 18 O record of water vapor in Niamey (Niger) reveals insightful atmospheric processes at different timescales, Geophys. Res. Lett. , 39 , L08805,
影响因子：
2
作者：
Gupta, Priya;Noone, David;Vaughn, Bruce H.
通讯作者：
Vaughn, Bruce H.