Hydroclimatological influences on recently increased droughts in China's  largest freshwater lake

Liu, Yuanbo; Wu, Gang

doi:10.5194/hess-20-93-2016

Cited by 46 publications

(23 citation statements)

References 44 publications

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“…The Poyang Lake basin has invaluable services in biodiversity maintenance, social and ecological benefits, flood control, and drought prevention (Hong et al , ; Liu and Wu, ; Wagner et al , ). It is an important region to the Global Change and Terrestrial Ecosystems project of the International Geosphere‐Biosphere Programme (IGBP) (Canadell et al , ) and internationally important wetlands (The Ramsar Convention, ).…”

Section: Study Area and Datamentioning

confidence: 99%

Spatio‐temporal pattern of meteorological droughts and its possible linkage with climate variability

Zhou

Liu

2017

Intl Journal of Climatology

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Spatial pattern of meteorological droughts is a critical element for investigating drought condition. Empirical orthogonal function (EOF) and rotated EOF (REOF) methods are widely used to discriminate dominant patterns. Previous works focused on case applications but left the associated physical meanings unexplored. This study employs the EOF, wavelet analysis, and stepwise regression methods to distinguish spatio‐temporal patterns of meteorological droughts with pattern interpretation. For this purpose, monthly precipitation data were used from 73 meteorological stations in the Poyang Lake basin of China for the period of 1960–2007. Standardized Precipitation Index (SPI) was applied to quantify meteorological droughts. Our results identified four leading EOF/REOF patterns at the basin scale. Seasonal SPI series showed more dominant periods than monthly SPI series, indicating periodic complexity of regional droughts. The dominant periods coincided with those of the EOF/REOF time coefficients. The four leading EOF/REOFs were significantly related to the dominant time scales of 2, 3, 6, 11, 16, and 17 years, except for the fifth EOF/REOF. Stepwise regression analysis further indicated that the four leading EOF/REOFs be likely the superposition of SPI variation from inter‐annual and inter‐decadal scales. The SPI series at different time scales (1–36 months) showed significant correlations with climate teleconnection modes, confirming the existence of identified spatio‐temporal pattern. The Niño3.4 and Southern Oscillation were the primary teleconnection modes that influenced the variability of meteorological droughts over the basin. The Pacific Decadal Oscillation and the North Atlantic Oscillation also contributed to the regional dry/wet alternation. The findings provide important implications for understanding spatial and temporal variation of regional droughts.

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Section: Study Area and Datamentioning

confidence: 99%

Spatio‐temporal pattern of meteorological droughts and its possible linkage with climate variability

Zhou

Liu

2017

Intl Journal of Climatology

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“…For example, Dai, Du, Li, Li, and Chen () reported that extreme drought (45%) contributed to the water flux loss more than the TGD impoundment (9%) in 2006. Y. Liu and Wu () also demonstrated that the hydroclimatic influences (e.g., reduced precipitation and inflow) largely contributed to Poyang Lake droughts but not the responsibility of TGD impoundments. Nevertheless, Lai et al () also found that the effects of the TGD on downstream rivers and lakes will be intensified in future when many ongoing and planned large‐scale dams located in the upstream tributaries in the Yangtze River.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal patterns of stable water isotopes along the Yangtze River during two drought years

Song

et al. 2017

Hydrological Processes

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Changes in the level of the Yangtze River caused by anthropogenic water regulation have major effects on the hydrological processes and water cycle in surrounding lakes and rivers. In this study, we obtained isotopic evidence of changes in the water cycle of Yangtze River during the two drought years of 2006 and 2013. Isotopic evidence demonstrated that the δ18O and δD levels in Yangtze River exhibited high spatial heterogeneity from the upper to lower reaches, which were controlled by atmospheric precipitation, tributary/lake water mixing, damming regulation, and water temperature. Both the slope and intercept of Yangtze River evaporative line (δD = 7.88 δ18O + 7.96) were slightly higher than those of local meteoric water line of Yangtze River catchment (δD = 7.41 δ18O + 6.01). Most of the river isotopic values were located below the local meteoric water line, thereby implying that the Yangtze River water experienced a certain degree of evaporative enrichment on isotopic compositions of river water. The high fluctuations in the isotopic composition (e.g., deuterium excess [d‐excess]) in the middle to lower reaches during the initial stage of operation for the Three Gorges Dams (2003–2006) were due to heterogeneous isotopic signatures from the upstream water. In contrast to the normal stage (after 2010) characterized by the maximum water level and largest water storage, a relatively small variability in the deuterium excess was found along the middle to lower reaches because of the homogenization of reservoir water with a longer residence time and complete mixing. The effects of water from lakes and tributaries on the isotopic compositions in mainstream water were highlighted because of the high contributions of lakes water (e.g., Dongting Lake and Poyang Lake) efflux to the Yangtze River mainstream, which ranged from 21% to 85% during 2006 and 2013. These findings suggest that the retention and regulation of the Three Gorges Dams has greatly buffered the isotopic variability of the water cycle in the Yangtze catchment, thereby improving our understanding of the complex lake–river interactions along the middle to lower reaches in the future.

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“…The basin not only provides a graceful natural ecological environment for the life of approximately 50 million people but also serves as an important national food base (Liu et al, ). It includes the largest freshwater lake (i.e., Poyang Lake) in China and plays a significant role in many aspects, such as maintaining biodiversity, socioeconomical and ecological activities, flood control, and drought prevention (Hong et al, ; Liu & Wu, ; The Ramsar Convention, ; Wagner et al, ). However, in recent decades, due to the impacts of climate changes and anthropogenic actives, the basin has frequently suffered from extreme hydrological events (e.g., drought and flood; Shankman et al, ; Ye et al, ; Zhang et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…However, in recent decades, due to the impacts of climate changes and anthropogenic actives, the basin has frequently suffered from extreme hydrological events (e.g., drought and flood; Shankman et al, ; Ye et al, ; Zhang et al, ). In comparison to the year before 2000, the current hydrological droughts in Poyang Lake have higher frequency, more severity, and longer duration (Liu & Wu, ). In addition, the basin is one of the most active regions where droughts occur (Herrera‐Estrada et al, ).…”

Section: Methodsmentioning

confidence: 99%

An Approach to Tracking Meteorological Drought Migration

Zhou

Liu

2019

Water Resources Research

Self Cite

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Spatiotemporal behaviors of meteorological droughts are basic for understanding the development and driving forces of droughts. Currently, there are a limited number of approaches mainly used to analyze the spatiotemporal evolution of large‐scale soil moisture/hydrological drought events at global or continental scales. These behavior description approaches on the spatiotemporal dynamics of drought are not perfect and should be improved further. To this end, a new approach was proposed to investigate the migration of meteorological droughts based on topological spatial relations. It was used to identify drought clusters, migration trajectories, and migration directions of meteorological droughts. In the Poyang Lake basin (24°29′ to 30°04′N, 113°34′ to 118°28′E), China, monthly precipitation data were available from 1960 to 2007. The one‐month standardized precipitation index was used to characterize meteorological droughts. The proposed approach identified a total of 77 drought events and 454 drought clusters during the study period. Their drought centroids were tracked and analyzed. The migration distances of drought events exhibited a significant linear relationship with the drought duration (R2 > 0.8, slope of 165 km per month). More than 70% of drought events had a migrating displacement greater than 1° (approximately 100 km). These results indicated that the meteorological drought events traveled actively and occurred on a widespread basis in the basin. Moreover, two main patterns of drought cluster migration (northward and southward) were identified. The approach and findings can provide some important implications to investigate the migration of meteorological droughts in other regions.

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Hydroclimatological influences on recently increased droughts in China's largest freshwater lake

Cited by 46 publications

References 44 publications

Spatio‐temporal pattern of meteorological droughts and its possible linkage with climate variability

Spatio‐temporal pattern of meteorological droughts and its possible linkage with climate variability

Spatial and temporal patterns of stable water isotopes along the Yangtze River during two drought years

An Approach to Tracking Meteorological Drought Migration

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