Gregory McCabe (Former Employee)
Science and Products
Filter Total Items: 85
Warming may create substantial water supply shortages in the Colorado River basin
The high demand for water, the recent multiyear drought (1999-2007), and projections of global warming have raised questions about the long-term sustainability of water supply in the southwestern United States. In this study, the potential effects of specific levels of atmospheric warming on water-year streamflow in the Colorado River basin are evaluated using a water-balance model, and the result
Authors
G.J. McCabe, D. M. Wolock
Rain-on-snow events in the western United States
Rain-on-snow events pose a significant flood hazard in the western United States. This study provides a description of the spatial and temporal variability of the frequency of rain-on-snow events for 4318 sites in the western United States during water years (October through September) 1949-2003. Rain-on-snow events are found to be most common during the months of October through May; however, at
Authors
G.J. McCabe, M.P. Clark, L.E. Hay
Associations of decadal to multidecadal sea-surface temperature variability with Upper Colorado River flow
The relations of decadal to multidecadal (D2M) variability in global sea-surface temperatures (SSTs) with D2M variability in the flow of the Upper Colorado River Basin (UCRB) are examined for the years 1906-2003. Results indicate that D2M variability of SSTs in the North Atlantic, North Pacific, tropical Pacific, and Indian Oceans is associated with D2M variability of the UCRB. A principal compone
Authors
G.J. McCabe, J.L. Betancourt, H.G. Hidalgo
Shifting covariability of North American summer monsoon precipitation with antecedent winter precipitation
Previous research has suggested that a general inverse relation exists between winter precipitation in the southwestern United states (US) and summer monsoon precipitation. In addition, it has been suggested that this inverse relation between winter precipitation and the magnitude of the southwestern US monsoon breaks down under certain climatic conditions that override the regional winter/monsoon
Authors
G.J. McCabe, M.P. Clark
Assimilation of snow covered area information into hydrologic and land-surface models
This paper describes a data assimilation method that uses observations of snow covered area (SCA) to update hydrologic model states in a mountainous catchment in Colorado. The assimilation method uses SCA information as part of an ensemble Kalman filter to alter the sub-basin distribution of snow as well as the basin water balance. This method permits an optimal combination of model simulations an
Authors
M.P. Clark, A.G. Slater, A.P. Barrett, L.E. Hay, G.J. McCabe, B. Rajagopalan, G.H. Leavesley
Multidecadal climate variability of global lands and oceans
Principal components analysis (PCA) and singular value decomposition (SVD) are used to identify the primary modes of decadal and multidecadal variability in annual global Palmer Drought Severity Index (PDSI) values and sea-surface temperature (SSTs). The PDSI and SST data for 1925-2003 were detrended and smoothed (with a 10-year moving average) to isolate the decadal and multidecadal variability.
Authors
G.J. McCabe, M.A. Palecki
Associations between accelerated glacier mass wastage and increased summer temperature in coastal regions
Low-elevation glaciers in coastal regions of Alaska, the Canadian Arctic, individual ice caps around the Greenland ice sheet, and the Patagonia Ice Fields have an aggregate glacier area of about 332 ?? 103 km 2 and account for approximately 42% of all the glacier area outside the Greenland and Antarctic ice sheets. They have shown volume loss, especially since the end of the 1980s, increasing from
Authors
M. Dyurgerov, G.J. McCabe
The state of the Colorado River ecosystem in Grand Canyon: A report of the Grand Canyon Monitoring and Research Center 1991-2004
This report is an important milestone in the effort by the Secretary of the Interior to implement the Grand Canyon Protection Act of 1992 (GCPA; title XVIII, secs. 1801-1809, of Public Law 102-575), the most recent authorizing legislation for Federal efforts to protect resources downstream from Glen Canyon Dam. The chapters that follow are intended to provide decision makers and the American publi
Trends and variability in snowmelt runoff in the western United States
The timing of snowmelt runoff (SMR) for 84 rivers in the western United States is examined to understand the character of SMR variability and the climate processes that may be driving changes in SMR timing. Results indicate that the timing of SMR for many rivers in the western United States has shifted to earlier in the snowmelt season. This shift occurred as a step change during the mid-1980s in
Authors
G.J. McCabe, M.P. Clark
Climate patterns as predictors of amphibians species richness and indicators of potential stress
Amphibians occupy a range of habitats throughout the world, but species richness is greatest in regions with moist, warm climates. We modeled the statistical relations of anuran and urodele species richness with mean annual climate for the conterminous United States, and compared the strength of these relations at national and regional levels. Model variables were calculated for county and subcoun
Authors
W. Battaglin, L. Hay, G. McCabe, P. Nanjappa, Alisa L. Gallant
Climatic fluctuations, drought, and flow of the Colorado River
No abstract available.
Authors
Robert H. Webb, Gregory J. McCabe, Richard Hereford, Christopher D. Wilkowske
Pacific and Atlantic Ocean influences on multidecadal drought frequency in the United States
More than half (52%) of the spatial and temporal variance in multidecadal drought frequency over the conterminous United States is attributable to the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO). An additional 22% of the variance in drought frequency is related to a complex spatial pattern of positive and negative trends in drought occurrence possibly related
Authors
G.J. McCabe, M.A. Palecki, J.L. Betancourt
Science and Products
Filter Total Items: 85
Warming may create substantial water supply shortages in the Colorado River basin
The high demand for water, the recent multiyear drought (1999-2007), and projections of global warming have raised questions about the long-term sustainability of water supply in the southwestern United States. In this study, the potential effects of specific levels of atmospheric warming on water-year streamflow in the Colorado River basin are evaluated using a water-balance model, and the result
Authors
G.J. McCabe, D. M. Wolock
Rain-on-snow events in the western United States
Rain-on-snow events pose a significant flood hazard in the western United States. This study provides a description of the spatial and temporal variability of the frequency of rain-on-snow events for 4318 sites in the western United States during water years (October through September) 1949-2003. Rain-on-snow events are found to be most common during the months of October through May; however, at
Authors
G.J. McCabe, M.P. Clark, L.E. Hay
Associations of decadal to multidecadal sea-surface temperature variability with Upper Colorado River flow
The relations of decadal to multidecadal (D2M) variability in global sea-surface temperatures (SSTs) with D2M variability in the flow of the Upper Colorado River Basin (UCRB) are examined for the years 1906-2003. Results indicate that D2M variability of SSTs in the North Atlantic, North Pacific, tropical Pacific, and Indian Oceans is associated with D2M variability of the UCRB. A principal compone
Authors
G.J. McCabe, J.L. Betancourt, H.G. Hidalgo
Shifting covariability of North American summer monsoon precipitation with antecedent winter precipitation
Previous research has suggested that a general inverse relation exists between winter precipitation in the southwestern United states (US) and summer monsoon precipitation. In addition, it has been suggested that this inverse relation between winter precipitation and the magnitude of the southwestern US monsoon breaks down under certain climatic conditions that override the regional winter/monsoon
Authors
G.J. McCabe, M.P. Clark
Assimilation of snow covered area information into hydrologic and land-surface models
This paper describes a data assimilation method that uses observations of snow covered area (SCA) to update hydrologic model states in a mountainous catchment in Colorado. The assimilation method uses SCA information as part of an ensemble Kalman filter to alter the sub-basin distribution of snow as well as the basin water balance. This method permits an optimal combination of model simulations an
Authors
M.P. Clark, A.G. Slater, A.P. Barrett, L.E. Hay, G.J. McCabe, B. Rajagopalan, G.H. Leavesley
Multidecadal climate variability of global lands and oceans
Principal components analysis (PCA) and singular value decomposition (SVD) are used to identify the primary modes of decadal and multidecadal variability in annual global Palmer Drought Severity Index (PDSI) values and sea-surface temperature (SSTs). The PDSI and SST data for 1925-2003 were detrended and smoothed (with a 10-year moving average) to isolate the decadal and multidecadal variability.
Authors
G.J. McCabe, M.A. Palecki
Associations between accelerated glacier mass wastage and increased summer temperature in coastal regions
Low-elevation glaciers in coastal regions of Alaska, the Canadian Arctic, individual ice caps around the Greenland ice sheet, and the Patagonia Ice Fields have an aggregate glacier area of about 332 ?? 103 km 2 and account for approximately 42% of all the glacier area outside the Greenland and Antarctic ice sheets. They have shown volume loss, especially since the end of the 1980s, increasing from
Authors
M. Dyurgerov, G.J. McCabe
The state of the Colorado River ecosystem in Grand Canyon: A report of the Grand Canyon Monitoring and Research Center 1991-2004
This report is an important milestone in the effort by the Secretary of the Interior to implement the Grand Canyon Protection Act of 1992 (GCPA; title XVIII, secs. 1801-1809, of Public Law 102-575), the most recent authorizing legislation for Federal efforts to protect resources downstream from Glen Canyon Dam. The chapters that follow are intended to provide decision makers and the American publi
Trends and variability in snowmelt runoff in the western United States
The timing of snowmelt runoff (SMR) for 84 rivers in the western United States is examined to understand the character of SMR variability and the climate processes that may be driving changes in SMR timing. Results indicate that the timing of SMR for many rivers in the western United States has shifted to earlier in the snowmelt season. This shift occurred as a step change during the mid-1980s in
Authors
G.J. McCabe, M.P. Clark
Climate patterns as predictors of amphibians species richness and indicators of potential stress
Amphibians occupy a range of habitats throughout the world, but species richness is greatest in regions with moist, warm climates. We modeled the statistical relations of anuran and urodele species richness with mean annual climate for the conterminous United States, and compared the strength of these relations at national and regional levels. Model variables were calculated for county and subcoun
Authors
W. Battaglin, L. Hay, G. McCabe, P. Nanjappa, Alisa L. Gallant
Climatic fluctuations, drought, and flow of the Colorado River
No abstract available.
Authors
Robert H. Webb, Gregory J. McCabe, Richard Hereford, Christopher D. Wilkowske
Pacific and Atlantic Ocean influences on multidecadal drought frequency in the United States
More than half (52%) of the spatial and temporal variance in multidecadal drought frequency over the conterminous United States is attributable to the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO). An additional 22% of the variance in drought frequency is related to a complex spatial pattern of positive and negative trends in drought occurrence possibly related
Authors
G.J. McCabe, M.A. Palecki, J.L. Betancourt