Noah Knowles
Noah Knowles is a Research Hydrologist with the USGS Water Resources Mission Area.
Science and Products
Filter Total Items: 31
Trends in snowfall versus rainfall in the western United States Trends in snowfall versus rainfall in the western United States
The water resources of the western United States depend heavily on snowpack to store part of the wintertime precipitation into the drier summer months. A well-documented shift toward earlier runoff in recent decades has been attributed to 1) more precipitation falling as rain instead of snow and 2) earlier snowmelt. The present study addresses the former, documenting a regional trend...
Authors
N. Knowles, M. D. Dettinger, D.R. Cayan
Snowmelt discharge characteristics Sierra Nevada, California Snowmelt discharge characteristics Sierra Nevada, California
Alpine snow is an important water resource in California and the western U.S. Three major features of alpine snowmelt are the spring pulse (the first surge in snowmelt-driven river discharge in spring), maximum snowmelt discharge, and base flow (low river discharge supported by groundwater in fall). A long term data set of hydrologic measurements at 24 gage locations in 20 watersheds in...
Authors
David Peterson, Richard Smith, Iris Stewart, Noah Knowles, Chris Soulard, Stephen Hager
Recent changes toward earlier springs---early signs of climate warming in western North America Recent changes toward earlier springs---early signs of climate warming in western North America
No abstract available.
Authors
D. Cayan, M. Dettinger, I. Stewart, N. Knowles
Climate anomalies generate an exceptional dinoflagellate bloom in San Francisco Bay Climate anomalies generate an exceptional dinoflagellate bloom in San Francisco Bay
We describe a large dinoflagellate bloom, unprecedented in nearly three decades of observation, that developed in San Francisco Bay (SFB) during September 2004. SFB is highly enriched in nutrients but has low summer‐autumn algal biomass because wind stress and tidally induced bottom stress produce a well mixed and light‐limited pelagic habitat. The bloom coincided with calm winds and...
Authors
J. E. Cloern, T.S. Schraga, C.B. Lopez, N. Knowles, Labiosa R. Grover, R. Dugdale
Elevational dependence of projected hydrologic changes in the San Francisco Estuary and watershed Elevational dependence of projected hydrologic changes in the San Francisco Estuary and watershed
California's primary hydrologic system, the San Francisco Estuary and its upstream watershed, is vulnerable to the regional hydrologic consequences of projected global climate change. Previous work has shown that a projected warming would result in a reduction of snowpack storage leading to higher winter and lower spring-summer streamflows and increased spring-summer salinities in the...
Authors
N. Knowles, D.R. Cayan
Climate science issues and needs of the CALFED Bay-Delta Program Climate science issues and needs of the CALFED Bay-Delta Program
No abstract available.
Authors
M. D. Dettinger, W.A. Bennett, D.R. Cayan, J. Florsheim, M. Hughes, B.L. Ingram, A.D. Jassby, N. Knowles, F. Malamud, D. H. Peterson, K. Redmond, L. Smith
Science and Products
Filter Total Items: 31
Trends in snowfall versus rainfall in the western United States Trends in snowfall versus rainfall in the western United States
The water resources of the western United States depend heavily on snowpack to store part of the wintertime precipitation into the drier summer months. A well-documented shift toward earlier runoff in recent decades has been attributed to 1) more precipitation falling as rain instead of snow and 2) earlier snowmelt. The present study addresses the former, documenting a regional trend...
Authors
N. Knowles, M. D. Dettinger, D.R. Cayan
Snowmelt discharge characteristics Sierra Nevada, California Snowmelt discharge characteristics Sierra Nevada, California
Alpine snow is an important water resource in California and the western U.S. Three major features of alpine snowmelt are the spring pulse (the first surge in snowmelt-driven river discharge in spring), maximum snowmelt discharge, and base flow (low river discharge supported by groundwater in fall). A long term data set of hydrologic measurements at 24 gage locations in 20 watersheds in...
Authors
David Peterson, Richard Smith, Iris Stewart, Noah Knowles, Chris Soulard, Stephen Hager
Recent changes toward earlier springs---early signs of climate warming in western North America Recent changes toward earlier springs---early signs of climate warming in western North America
No abstract available.
Authors
D. Cayan, M. Dettinger, I. Stewart, N. Knowles
Climate anomalies generate an exceptional dinoflagellate bloom in San Francisco Bay Climate anomalies generate an exceptional dinoflagellate bloom in San Francisco Bay
We describe a large dinoflagellate bloom, unprecedented in nearly three decades of observation, that developed in San Francisco Bay (SFB) during September 2004. SFB is highly enriched in nutrients but has low summer‐autumn algal biomass because wind stress and tidally induced bottom stress produce a well mixed and light‐limited pelagic habitat. The bloom coincided with calm winds and...
Authors
J. E. Cloern, T.S. Schraga, C.B. Lopez, N. Knowles, Labiosa R. Grover, R. Dugdale
Elevational dependence of projected hydrologic changes in the San Francisco Estuary and watershed Elevational dependence of projected hydrologic changes in the San Francisco Estuary and watershed
California's primary hydrologic system, the San Francisco Estuary and its upstream watershed, is vulnerable to the regional hydrologic consequences of projected global climate change. Previous work has shown that a projected warming would result in a reduction of snowpack storage leading to higher winter and lower spring-summer streamflows and increased spring-summer salinities in the...
Authors
N. Knowles, D.R. Cayan
Climate science issues and needs of the CALFED Bay-Delta Program Climate science issues and needs of the CALFED Bay-Delta Program
No abstract available.
Authors
M. D. Dettinger, W.A. Bennett, D.R. Cayan, J. Florsheim, M. Hughes, B.L. Ingram, A.D. Jassby, N. Knowles, F. Malamud, D. H. Peterson, K. Redmond, L. Smith