Quantification of linkages between large-scale climatic patterns and precipitation in the Colorado River Basin
TL;DR: In this paper, the authors analyzed the linkages between large-scale climate patterns and regional precipitation variability, in particular the interannual variation of seasonal precipitation in the Colorado River Basin.
About: This article is published in Journal of Hydrology.The article was published on 2006-04-30. It has received 57 citations till now. The article focuses on the topics: Pacific decadal oscillation & Precipitation.
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24 Feb 2011TL;DR: The Global River Database as mentioned in this paper is a collection of river data from North and Central America, South America, Europe, Africa, Asia, and Oceania with a focus on flooding and erosion.
Abstract: Foreword 1. Introduction 2. Runoff, erosion and delivery to the coastal ocean 3. Temporal variations 4. Human impacts Appendices. Global River Database: Appendix A: North and Central America Appendix B: South America Appendix C: Europe Appendix D: Africa Appendix E: Eurasia Appendix F: Asia Appendix G: Oceania References Index.
1,046 citations
TL;DR: In this article, a Groundwater Resource Index (GRI) is presented as a reliable tool useful in a multi-analysis approach for monitoring and forecasting drought conditions, which is derived from a simple distributed water balance model, and has been tested in a Mediterranean region, characterized by different geo-lithological conditions mainly affecting the summer hydrologic response of the catchments to winter precipitation.
165 citations
TL;DR: In this article, loglinear models were fitted to drought class transitions derived from Standardized Precipitation Index (SPI) time series computed in a 12-month time scale, and results of three-dimensional loglinear modeling present good results when comparing predicted and observed drought classes with 1 and 2 months lead for those 14 sites.
157 citations
Cites background from "Quantification of linkages between ..."
...At present, more powerful tools explore teleconnections, mainly in relation to the El Niño-southern oscillation (ENSO) phenomenon (Cordery and McCall, 2000; Tadesse et al., 2005; Kim et al., 2006), whose influences on atmospheric circulation patterns are apparent in regions very far from the Pacific Ocean, and the North Atlantic oscillation (Wedgbrow et al....
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...…explore teleconnections, mainly in relation to the El Niño-southern oscillation (ENSO) phenomenon (Cordery and McCall, 2000; Tadesse et al., 2005; Kim et al., 2006), whose influences on atmospheric circulation patterns are apparent in regions very far from the Pacific Ocean, and the North…...
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TL;DR: In this paper, the authors used the Standard Precipitation Index (SPI) to track drought and assess the impact of rainfall on shallow groundwater levels in three selected irrigation areas of the Murray-Darling Basin in Australia.
Abstract: The Standard Precipitation Index (SPI) is employed to track drought and assess the impact of rainfall on shallow groundwater levels in three selected irrigation areas of the Murray-Darling Basin in Australia. The continuous SPI method can provide better means of quantifying rainfall variability and correlating it with changes of shallow watertable levels since it is based on continuous statistical functions comparing rainfall variability over the entire rainfall record. Drought analysis in the Australian irrigation areas using SPI indicates that the recent 2000–2006 drought is not the worst drought that has occurred in the recorded history, however if the current low rainfall pattern continues, it would be one of the most prolonged drought. The shallow groundwater fluctuations in the Murrumbidgee Irrigation Area show a very strong correlation with winter rainfall variation. The shallow piezometric levels in the Coleambally Irrigation Area show a weaker degree of correlation with the SPI due to local and regional groundwater dynamics and changes in rice water use. The groundwater levels in the Murray Irrigation Area show least correlation with the SPI, which may be attributed to improved irrigation management practices and complex nature of the groundwater recharge and discharge processes in this area. The overall results however show that the SPI correlates well with fluctuations in shallow ground water table in irrigation areas, and can also capture major drought patterns in Australia. The correlation of SPI with groundwater levels can be adopted for environmental reporting and used as a method of relating climatic impacts on watertables. Differences in piezometric response between years with similar winter and yearly SPI values can be attributed to improvement in irrigators’ management practices.
133 citations
TL;DR: In this paper, a non-stationary gamma distribution with climate indices in its location parameter as a covariate is proposed to incorporate the environmental changes in the present scenario of climate change.
88 citations
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01 Jan 1986
TL;DR: The Kernel Method for Multivariate Data: Three Important Methods and Density Estimation in Action.
Abstract: Introduction. Survey of Existing Methods. The Kernel Method for Univariate Data. The Kernel Method for Multivariate Data. Three Important Methods. Density Estimation in Action.
15,499 citations
TL;DR: 1. Density estimation for exploring data 2. D density estimation for inference 3. Nonparametric regression for explore data 4. Inference with nonparametric regressors 5. Checking parametric regression models 6. Comparing regression curves and surfaces
Abstract: 1. Density estimation for exploring data 2. Density estimation for inference 3. Nonparametric regression for exploring data 4. Inference with nonparametric regression 5. Checking parametric regression models 6. Comparing regression curves and surfaces 7. Time series data 8. An introduction to semiparametric and additive models References
1,424 citations
TL;DR: In this article, the authors describe an investigation of the typical North American precipitation and temperature patterns associated with the El Nino/Southern Oscillation (ENSO) and analyze monthly surface temperature and precipitation data using a method designed to identify regions of the globe that have responses associated with ENSO.
Abstract: This paper describes an investigation of the “typical” North American precipitation and temperature patterns associated with the El Nino/Southern Oscillation (ENSO). Monthly surface temperature and precipitation data are analyzed using a method designed to identify regions of the globe that have responses associated with ENSO. Monthly composites, covering idealized two-year ENSO episodes, are computed for temperature and precipitation at all stations with data spanning seven or more ENSO events. The firm harmonic is extracted from the 24 monthly composite values and plotted in the form of a two-year harmonic dial vector. When plotted on a map of North America, these vectors reveal both the regions of coherent response and the phase of the responses with respect to the evolution of the ENSO episode. Time series of temperature and precipitation for the regions identified in the harmonic vector maps are examined to determine the magnitudes of the responses and the percentage of the time that the ide...
1,343 citations
TL;DR: In this paper, the authors examined the relationship between precipitation and the high index phase of the Southern Oscillation (SO) for 19 regions of the globe which have documented low SO index-precipitation relationships (Ropelewski and Halpert 1986, 1987).
Abstract: The relationships are examined between precipitation and the high index phase of the Southern Oscillation (SO) for 19 regions of the globe which have documented low SO index-precipitation relationships (Ropelewski and Halpert 1986, 1987). The study reveals that 15 of these regions also show evidence of characteristic precipitation anomalies during the high index phase of the SO. In each of the regions, the high SO index-precipitation relationships show the opposite sign of those documented for the low index. These precipitation relationships were consistent, holding for over 70% of the high SO index years, and statistically significant. In particular, the high index phase of the SO is associated with enhanced precipitation for the monsoons of India and northern Australia as well as for the rainy seasons in northeastern South America and southeastern Africa. High SO index precipitation was found to be less than median in the central Pacific, Minicoy-Sri Lanka, eastern equatorial Africa, the Gulf o...
1,125 citations
TL;DR: The spectral characteristics of the Palmer Drought Index vary from site to site throughout the U.S., while those of the Standardized Precipitation Index do not vary from sites to sites as mentioned in this paper.
Abstract: The Palmer Drought Index (PDI) is used as an indicator of drought severity, and a particular index value is often the signal to begin or discontinue elements of a drought contingency plan. The Standardized Precipitation Index (SPI) was recently developed to quantify a precipitation deficit for different time scales. It was designed to be an indicator of drought that recognizes the importance of time scales in the analysis of water availability and water use.
This study compares historical time series of the PDI with time series of the corresponding SPI through spectral analysis. Results show that the spectral characteristics of the PDI vary from site to site throughout the U.S., while those of the SPI do not vary from site to site. They also show that the PDI has a complex structure with an exceptionally long memory, while the SPI is an easily interpreted, simple moving average process.
1,051 citations