Wavelet-based variability of Yellow River discharge at 500-, 100-, and 50-year timescales

Su, Lei; Miao, Chiyuan; Borthwick, Alistair G. L.; Duan, Qingyun

doi:10.1016/j.gr.2017.05.013

Cited by 28 publications

(16 citation statements)

References 82 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wavelet transform coherence was used to detect the existence of co-varying relationships between hydrometeorological factors and their potential drivers and quantify the degree of linear relatedness (Christopher Torrence, 1998;Jevrejeva et al, 2003;Cazelles et al, 2008;Keener et al, 2010;Su et al, 2017). WTC was used to discover relationships between low common power spectra of two time series (Wang et al, 2019a) (Text S1).…”

Section: Wavelet Transform Coherence (Wtc)mentioning

confidence: 99%

Asymmetric trends of extreme temperature over the Loess Plateau during 1998–2018

Ding

Jia

Meng

et al. 2020

Intl Journal of Climatology

View full text Add to dashboard Cite

A slowdown in the warming rate of the global mean surface temperature has been observed since late 1990s. However, it is still controversial whether the spatiotemporal variability of extreme temperature events will increase after global warming slowdown, and whether the regional diversity of change trends will increase. Here, we investigated the variations in extreme temperature indices over the Loess Plateau in China since 1961 and focused on the recent global warming slowdown (1998-2018). We found that, during 1961-2018, all the extreme temperature indices showed a significant warming trend and its intensity varied according to extreme temperature indices over different regions. A warming slowdown of annual mean temperature during 1998-2018 was primarily due to the slight increases of annual mean maximum temperatures (TXm) while the annual mean minimum temperature (TNm) still indicated prominently warming trends. During the recent warming slowdown period, the warm indices showed continued intensification of the warming trends, while the cold indices showed a slight cooling trend. Moreover, all extreme temperature indices showed the largest warming trend in summer and a slight cooling trend in winter. Overall, the extreme temperature events have become more diverse in spatial and temporal, indicating that regional climate are more unstable than previously reported for this region. Further analyses revealed that the extreme temperature events during the recent warming slowdown Zhiyong Ding and Jia Pu contributed equally to this study.

show abstract

Section: Wavelet Transform Coherence (Wtc)mentioning

confidence: 99%

Asymmetric trends of extreme temperature over the Loess Plateau during 1998–2018

Ding

Jia

Meng

et al. 2020

Intl Journal of Climatology

View full text Add to dashboard Cite

show abstract

“…Unlike most Following the data pre-processing steps, a CWT was applied to quantify the time-averaged frequency spectra of the rainfall, PET and groundwater datasets. The CWT has been used to assess long term trends and periodicities in many hydrological datasets including rainfall (Rashid et al 2015), river flow (Su et al 2017), and groundwater (Holman et al 2011;Kuss & Gurdak 2014). We use the package "WaveletComp" produced by Rosch & Schmidbauer (2018) for all transformations in this paper.…”

Section: Data Pre-processingmentioning

confidence: 99%

Understanding the potential of climate teleconnections to project future groundwater drought

Rust¹,

Holman²,

Bloomfield³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. Predicting the next major drought is of paramount interest to water managers, globally. Estimating the onset of groundwater drought is of particular importance, as groundwater resources are often assumed to be more resilient when surface water resources begin to fail. A potential source of long-term forecasting is offered by possible periodic controls on groundwater level via teleconnections with oscillatory ocean-atmosphere systems. However, relationships between large-scale climate systems and regional to local-scale rainfall, ET and groundwater are often complex and non-linear so that the influence of long-term climate cycles on groundwater drought remains poorly understood. Furthermore it is currently unknown whether the absolute contribution of multi-annual climate variability to total groundwater storage is significant. This study assesses the extent to which inter-annual variability in groundwater can be used to indicate the timing of groundwater droughts in the UK. Continuous wavelet transforms show how repeating teleconnection-driven 7-year and 16–32 year cycles in the majority of groundwater sites from all the UK's major aquifers can systematically control the recurrence of groundwater drought; and we provide evidence that these periodic modes are driven by teleconnections. Wavelet reconstructions demonstrate that multi-annual periodicities of the North Atlantic Oscillation, known to drive North Atlantic meteorology, comprise up to 40 % of the total groundwater storage variability. Furthermore, the majority of UK recorded droughts in recent history coincide with a minima phase in the 7-year NAO-driven cycles in groundwater level, allowing the estimation of future drought occurrences on a multi-annual timescale. Long-range groundwater drought forecasts via climate teleconnections present transformational opportunities to drought prediction and its management across the North Atlantic region.

show abstract

“…As such, the NAO has been shown to drive hydrological variability in Europe, including river flow (Kingston et al, 2011;Svensson et al, 2015) and groundwater systems (Rust et al, 2019;Neves et al, 2019;Holman et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this paper is to assess the extent to which NAO-like multi-annual signals are propagated from rainfall to streamflow across the UK and to assess how this is modulated by the relative contribution of faster and slower hydrological pathways. We define NAO-like as those multi-annual cycles in hydrometeorological records that cover a wide spatial domain and are similar in length to the 6-9 year periodicity reported in the NAO, which we might expect given the control between the NAO and hydrological systems (Svensson et al, 2015). This aim will be met by addressing the following research objectives:…”

Section: Introductionmentioning

confidence: 99%

Exploring the role of hydrological pathways in modulating multi-annual climate teleconnection periodicities from UK rainfall to streamflow

Rust

Cuthbert

Bloomfield

et al. 2021

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. An understanding of multi-annual behaviour in streamflow allows for better estimation of the risks associated with hydrological extremes. This can enable improved preparedness for streamflow-dependant services, such as freshwater ecology, drinking water supply and agriculture. Recently, efforts have focused on detecting relationships between long-term hydrological behaviour and oscillatory climate systems (such as the North Atlantic Oscillation – NAO). For instance, the approximate 7 year periodicity of the NAO has been detected in groundwater-level records in the North Atlantic region, providing potential improvements to the preparedness for future water resource extremes due to their repetitive, periodic nature. However, the extent to which these 7-year, NAO-like signals are propagated to streamflow, and the catchment processes that modulate this propagation, are currently unknown. Here, we show statistically significant evidence that these 7-year periodicities are present in streamflow (and associated catchment rainfall), by applying multi-resolution analysis to a large data set of streamflow and associated catchment rainfall across the UK. Our results provide new evidence for spatial patterns of NAO periodicities in UK rainfall, with areas of greatest NAO signal found in southwest England, south Wales, Northern Ireland and central Scotland, and show that NAO-like periodicities account for a greater proportion of streamflow variability in these areas. Furthermore, we find that catchments with greater subsurface pathway contribution, as characterised by the baseflow index (BFI), generally show increased NAO-like signal strength and that subsurface response times (as characterised by groundwater response time – GRT), of between 4 and 8 years, show a greater signal presence. Our results provide a foundation of understanding for the screening and use of streamflow teleconnections for improving the practice and policy of long-term streamflow resource management.

show abstract

Wavelet-based variability of Yellow River discharge at 500-, 100-, and 50-year timescales

Cited by 28 publications

References 82 publications

Asymmetric trends of extreme temperature over the Loess Plateau during 1998–2018

Asymmetric trends of extreme temperature over the Loess Plateau during 1998–2018

Understanding the potential of climate teleconnections to project future groundwater drought

Exploring the role of hydrological pathways in modulating multi-annual climate teleconnection periodicities from UK rainfall to streamflow

Contact Info

Product

Resources

About