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Noah Knowles

Research Hydrologist

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Short Biography

My work involves the application of climate science, numerical modeling, and analysis of large datasets to diverse natural systems. I work both alone and in multidisciplinary projects studying systems in which climate change in various manifestations could have an important influence. My work has included documenting hydrometeorological changes on a west-wide scale, hydrologic changes in California, and estuarine water-quality issues associated with climate change. Since 2006, I have been involved with a large, multidisciplinary project to assess the impacts of projected climate change on California's primary hydrological system, the San Francisco Estuary and its watershed.

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Knowles, N. 2015. Trends in Snow Cover and Related Quantities at Weather Stations in the Conterminous United States. J. Climate, 28, 7518–7528. [Link]

Cloern J.E., Knowles N., Brown L.R., Cayan D.R., Dettinger M.D., Morgan T.L., Schoellhamer D.H., Stacey M., van der Wegen M., Wagner R.W., Jassby A.D. 2011. Projected evolution of California’s San Francisco Bay-Delta-River system in a century of climate change. PLoS ONE, 6(9). [Link]

Brown, L.R., W.A. Bennett, R.W. Wagner, T. Morgan-King, N. Knowles, F. Feyrer, D. Schoellhamer, M. Stacey, M. Dettinger. 2011. Implications for Future Survival of Delta Smelt from Four Climate Change Scenarios for the Sacramento-San Joaquin Delta, California. Estuaries and Coasts, 36(4). [Link]

Knowles, N., 2010. Potential inundation due to rising sea levels in the San Francisco Bay region. San Francisco Estuary and Watershed Science, 8(1). [Link]

Dettinger, M.D., H. Hidalgo, T. Das, Cayan, D.R., and Knowles, N., 2009. Projections of potential flood regime changes in California. California Climate Change Center publication CEC-500-2009-050-F, 68 pages. [Link]

Ganju, N.K., Knowles, N., and Schoellhamer, D.H., 2008. Temporal downscaling of decadal sediment load estimates to a daily interval for use in hindcast simulations. Journal of Hydrology 349(3-4): 512-523. [Link]

Knowles, N., Dettinger, M.D., and Cayan, D.R., 2006. Trends in snowfall versus rainfall in the western United States. Journal of Climate, 19(18), 4545–4559. [Link]

Cloern, J. E., Schraga, T.S., Lopez, C.B., Knowles, N., Labiosa, R.G., and Dugdale, R., 2005. Climate anomalies generate an exceptional dinoflagellate bloom in San Francisco Bay. Geophysical Research Letters, 32, L14608. [Link]

Knowles, N. and Cayan, D.R., 2004. Elevational dependence of projected hydrologic changes in the San Francisco Estuary and watershed. Climatic Change, 62, 319-336. [Link]

Cayan, D.R., Dettinger, M.D., Redmond, K., McCabe, G., Knowles, N., and Peterson, D.H., 2003. "The transboundary setting of California's water and hydropower systems—linkages between the Sierra Nevada, Columbia, and Colorado hydroclimates", book chapter. [Link]

Dettinger, M.D., Bennett, W.A., Cayan, D.R., Florsheim, J., Hughes, M., Ingram, B.L., Jassby, A., Knowles, N., Malamud, F., Peterson, D.H., Redmond, K., and Smith, L., 2003. Climate science issues and needs of the CALFED Bay-Delta Program. American Meteorological Society, 83rd Annual Meeting, Impacts of Water Variability Symposium, Long Beach, California, 7.11-1 to 7.11-4. [Link]

Knowles, N., 2002. Natural and human influences on freshwater inflows and salinity in the San Francisco Estuary at monthly to interannual scales. Water Resources Research, 38, 25-1-25-11. [Link]

Knowles, N. and Cayan, D.R., 2002. Potential effects of global warming on the Sacramento/San Joaquin watershed and the San Francisco Estuary. Geophysical Research Letters, 29, 38-1-38-4. [Link]

Stahle, D., Therrell, M., Cleaveland, M.K., Cayan, D.R., Dettinger, M.D., and Knowles, N., 2001. Ancient blue oaks reveal human impact on San Francisco Bay salinity. EOS: Transactions, American Geophysical Union, 82(12). [Link]

Knowles, N. 2000. Modeling the hydroclimate of the San Francisco Bay-Delta Estuary and watershed. Doctoral Dissertation, Scripps Institution of Oceanography. La Jolla, California, University of California, San Diego. [Link]

My USGS Science Strategy Areas

Understanding Ecosystems & Predicting Ecosystems Change

Climate Variability & Change

Related Web Sites

CASCaDE Project

Sea level rise and San Francisco Bay

Contact Information

Noah Knowles
345 Middlefield Road
Menlo Park, CA 94025
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