Application of Lagrange Water Vapor Source Diagnosis Method to the Three-river Source Area

Quan Chen; Chen Bin; Zhao Tianliang; Zhou Bingrong; Han Yongxiang

doi:10.11898/1001-7313.20160605

Vol.27, NO.6, 2016

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Article Navigation > Journal of Applied Meteorological Science > 2016 > 27(6): 688-697

Quan Chen, Chen Bin, Zhao Tianliang, et al. Application of lagrange water vapor source diagnosis method to the Three-river Source Area. J Appl Meteor Sci, 2016, 27(6): 688-697. DOI: 10.11898/1001-7313.20160605.

Citation:

Quan Chen, Chen Bin, Zhao Tianliang, et al. Application of lagrange water vapor source diagnosis method to the Three-river Source Area. J Appl Meteor Sci, 2016, 27(6): 688-697. DOI: 10.11898/1001-7313.20160605.

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Application of Lagrange Water Vapor Source Diagnosis Method to the Three-river Source Area

DOI: 10.11898/1001-7313.20160605

1.
Qinghai Institute of Meteorological Science, Qinghai Key Laboratory of Disaster Prevention and Mitigation, Xining 810001
2.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
3.
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing 210044

Received Date: 2016-03-06
Rev Recd Date: 2016-07-07
Publish Date: 2016-11-30

Abstract

Abstract

The Three-river Source (TRS) region locating at the Tibet Plateau hinterland, contains a huge resources, gives birth to several world famous rivers, and supplies fresh water resources for East Asia. Identification of the regional moisture source is of great significance for understanding of regional water budget and improving the ability of water resources management. Ensemble modeling method is used with the three-dimensional Lagrangian transport model FLEXPART (Flexible Particle Model), driven by the GFS (Global Forecast System) reanalysis data (four times one day) from NCEP/NCAR. Then, the water vapor transport and source identification technology is used to identify the main moisture source for TRS region, with consideration of the spesific humidity changes along their transport pathways. The result indicates that a large number of air parcels experience several surface-atmosphere water vapor cycle process before reaching the TRS region. Dominated by the moisture transport form the prevailing westerlies and the central Asia strong evaporation, moisture sources characterized by relative short time transport (less than 6 days) mainly come from the Tibetan Plateau and its northwest edge, while the moisture sources with longer time (8-10 days) can be traced backward to the Arabian Sea, the Bay of Bengal, and so on. The water vapor reaching the TRS region transport can roughly be categorized to two pathways: The first is along the Somali to the Arabian Sea water vapor transport across the equator, and the second is the west path controlled by the west wind, transport from central Asia and west Asia to TRS region. Quantitative analysis shows that the moisture source also exhibits obvious sub-seasonal variability during the summer, characterized by the leading source area located in the west side of TRS region in June, and the Arabian Sea in July. However, the contribution from the Arabian Sea decreases and the contribution from the Bay of Bengal increases in August. Throughout the summer, the North of the Plateau maintains a stable water vapor transport.
- Three-river Source region;
- moisture source;
- Lagrangian modelling

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Figures and Tables

图 1 夏季 (6—8月) 到达三江源前空气块E-P场

Fig. 1 The summer seasonal mean (July-August) of E-P calculated using all parcels reaching the TRS region

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图 2 2007—2009年夏季到达三江源区前10 d空气块平均密度分布 (1°×1°)

Fig. 2 The summer seasonal mean particle distribution density averaged as a percentage of particles for precious 10 days before reaching the TRS region (numbers are binned on 1°×1° lat-lon grid)

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图 3 2007—2009年夏季到达三江源区所有后向10 d E-P值的平均分布

Fig. 3 The mean distribution of 10-day integrated E-P in summer from 2007 to 2009 calculated by all particles reaching the TRS region determined from backtracking

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图 4 潜在水汽源区示意图

Fig. 4 The potential water vapor source region

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图 5 夏季不同水汽源区E-P的贡献随时间变化

Fig. 5 he temporal variation of four different moisture source contribution with backward 10-day tracking in summer

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