Multiscale Hydro-Meteorological Factors Variations and Its Links to Large-Scale Atmospheric Circulation Systems in the Source Region of Yangtze River

Tang, Jie

doi:10.20944/preprints201810.0629.v1

Cited by 3 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under the combined action of different atmospheric circulation systems, and due to the region's unique topographic conditions, extreme precipitation on the Tibetan Plateau exhibits notable local characteristics [34]. Tang et al [74] concluded that South Asian monsoons are the primary atmospheric circulation factor affecting precipitation in the SRYR. Li et al [75] found that plateau monsoons, El Niño events, and plateau snow cover are the primary factors governing interannual changes in extreme climate events in the SRYR.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Precipitation Extremes in the Source Region of the Yangtze River during 1960–2016

Zhou

Liang

Zhao

et al. 2018

Water

View full text Add to dashboard Cite

The source region of the Yangtze River (SRYR) on the central Tibetan Plateau has seen one of the most significant increases in temperature in the world. Climate warming has altered the temporal and spatial characteristics of precipitation in the SRYR. In this study, we analyzed the temporal trends and spatial distributions of extreme precipitation in the SRYR during 1960–2016 using 11 extreme precipitation indices (EPIs) derived from daily precipitation data collected at five meteorological stations in the region. The trends in the EPIs were estimated using the linear least squares method, and their statistical significance was assessed using the Mann–Kendall test. The results show the following. Temporally, the majority of SRYR EPIs (including the simple daily intensity index, annual maximum 1-day precipitation (RX1day), annual maximum 5-day precipitation (RX5day), very wet day precipitation, extremely wet day precipitation, number of heavy precipitation days, number of very heavy precipitation days, and number of consecutive wet days) exhibited statistically nonsignificant increasing trends during the study period, while annual total wet-day precipitation (PRCPTOT) and the number of wet days exhibited statistically significant increasing trends. In addition, the number of consecutive dry days (CDD) exhibited a statistically significant decreasing trend. For the seasonal EPIs, the PRCPTOT, RX1day, and RX5day all exhibited nonsignificant increasing trends during the wet season, and significant increasing trends during the dry season. Spatially, changes in the annual and wet season EPIs in the study area both exhibited significant differences in their spatial distribution. By contrast, changes in dry season PRCPTOT, RX1day, and RX5day exhibited notable spatial consistency. These three indices exhibited increasing trends at each station. Moreover, there was a statistically significant positive correlation between the annual PRCPTOT and each of the other EPIs (except CDD). However, the contribution of extreme precipitation to annual PRCPTOT exhibited a nonsignificant decreasing trend.

show abstract

Section: Discussionmentioning

confidence: 99%

Analysis of Precipitation Extremes in the Source Region of the Yangtze River during 1960–2016

Zhou

Liang

Zhao

et al. 2018

Water

View full text Add to dashboard Cite

show abstract

“…Although the melting of glacier also affects the surface runoff in the Tuotuo River (e.g., Yang et al 2003;Wang et al 2013;Jin et al 2013;Zhang et al 2014;Qian et al 2014;Tang et al 2018, etc. ), this effect is likely less than precipitation (e.g., Qian et al 2014;Tang et al 2018). Evaporation is another important factor to the hydrological cycle.…”

Section: B Variations Of the Tp Water Vapormentioning

confidence: 99%

The Interdecadal Change of Summer Water Vapor over the Tibetan Plateau and Associated Mechanisms

2019

View full text Add to dashboard Cite

In recent decades, long-term changes of the Tibetan Plateau (TP) water vapor and the associated mechanisms have not been investigated fully. This study aims to examine the interdecadal change of summer TP water vapor using the monthly mean European Centre for Medium-Range Weather Forecasts interim reanalysis during 1979–2014. The results show a drier phase in the TP during 1979–94, with a subsequent wetter phase, which suggests an interdecadal variation of summer TP water vapor around the middle of the 1990s. This interdecadal variation is mainly due to a significant change of the water vapor export on the eastern boundary of the TP, which is closely associated with a summer atmospheric circulation anomaly near Lake Baikal. When a cyclonic (an anticyclonic) anomaly occurs near Lake Baikal, there is less (more) water vapor over the TP. On the interdecadal scale, the atmospheric circulation anomaly near Lake Baikal is related to an extratropical large-scale anomalous wave train over the northwestern Atlantic–East Asian region, with an eastward propagation of the anomalous wave energy from the Atlantic to East Asia. Climate model simulations further demonstrate an impact of sea surface temperature (SST) anomalies in the northwestern Atlantic on the anomalous wave train. Both the extratropical tropospheric anomalous wave train and the anomalous atmospheric circulation near Lake Baikal are successfully simulated by changing the summer northwestern Atlantic SST. Therefore the warming northwestern Atlantic is an important factor contributing to the wetting TP in recent decades.

show abstract

“…Nowadays, an increasing amount of research has indicated that circulation parameters are related to variations in regional climate patterns [25,27,28]. Gong et al [29] found that regional temperature fluctuation is significantly associated with variation of the North Atlantic Oscillation (NAO), the North Pacific Oscillation (NPO), and the Southern Oscillation (SO).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Variations of Potential Evapotranspiration in the Loess Plateau of China During 1960–2017

et al. 2020

View full text Add to dashboard Cite

Potential evapotranspiration (ET0) is an integral component of the hydrological cycle and the global energy balance, and its long-term variation is of much concern in climate change studies. The Loess Plateau is an important area of agricultural civilization and water resources research. This study analyzed the spatial and temporal evolution processes and influential parameters of ET0 at 70 stations in different topographical areas of the Chinese Loess Plateau (CLP). Using the Mann–Kendall trend, Cross wavelet transform, and the ArcGIS platform, the ET0 of each station was quantified using the Penman–Monteith equation, and the effects of climatic factors on ET0 were assessed by analyzing the correlation coefficients and contribution rates of the climatic factors. The results showed that: (1) the overall trend of the ET0 in different terrains of the Loess Plateau is consistent, however, the ET0 values differ; the hill region (HR) has the highest ET0, followed by the valley region (VR), and the mountain region (MR) has the lowest, and ET0 changes differ between seasons. (2) Spatial distribution characteristics of multiyear mean ET0 in the study are as follows: the ET0 values in mountain and hilly areas are decreasing from west to east, and the higher mean annual ET0 value in the VR is mainly concentrated in the eastern CLP. (3) In the past 58 years, the annual mean and the seasonal ET0 of the region showed increasing trends, however, differences in different terrains were obvious. (4) ET0 has significant correlations with El Niño–Southern Oscillation (ENSO), Pacific–North American teleconnection (PNA), and Atlantic Multidecadal Oscillation (AMO). The resonance period of ET0 and ENSO was 3–6 a, mainly in 1976–1985. The mean coherence phase angle was close to 360°, indicating that ET0 lags behind PNA by approximately 2–6 a; ET0 has a very strong positive correlation with AMO. (5) Relative humidity (RH) is the main influencing factor of ET0 change in the Loess Plateau. Temperature (T) variation has the highest contribution rate (42%) to the regional ET0 variation in the entire CLP. We should pay more attention to the variation of evaporation under future climate change, especially temperature change.

show abstract

Multiscale Hydro-Meteorological Factors Variations and Its Links to Large-Scale Atmospheric Circulation Systems in the Source Region of Yangtze River

Cited by 3 publications

References 28 publications

Analysis of Precipitation Extremes in the Source Region of the Yangtze River during 1960–2016

Analysis of Precipitation Extremes in the Source Region of the Yangtze River during 1960–2016

The Interdecadal Change of Summer Water Vapor over the Tibetan Plateau and Associated Mechanisms

Spatial and Temporal Variations of Potential Evapotranspiration in the Loess Plateau of China During 1960–2017

Contact Info

Product

Resources

About