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PLOS ONE  2011 

Projected Evolution of California's San Francisco Bay-Delta-River System in a Century of Climate Change

DOI: 10.1371/journal.pone.0024465

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Background Accumulating evidence shows that the planet is warming as a response to human emissions of greenhouse gases. Strategies of adaptation to climate change will require quantitative projections of how altered regional patterns of temperature, precipitation and sea level could cascade to provoke local impacts such as modified water supplies, increasing risks of coastal flooding, and growing challenges to sustainability of native species. Methodology/Principal Findings We linked a series of models to investigate responses of California's San Francisco Estuary-Watershed (SFEW) system to two contrasting scenarios of climate change. Model outputs for scenarios of fast and moderate warming are presented as 2010–2099 projections of nine indicators of changing climate, hydrology and habitat quality. Trends of these indicators measure rates of: increasing air and water temperatures, salinity and sea level; decreasing precipitation, runoff, snowmelt contribution to runoff, and suspended sediment concentrations; and increasing frequency of extreme environmental conditions such as water temperatures and sea level beyond the ranges of historical observations. Conclusions/Significance Most of these environmental indicators change substantially over the 21st century, and many would present challenges to natural and managed systems. Adaptations to these changes will require flexible planning to cope with growing risks to humans and the challenges of meeting demands for fresh water and sustaining native biota. Programs of ecosystem rehabilitation and biodiversity conservation in coastal landscapes will be most likely to meet their objectives if they are designed from considerations that include: (1) an integrated perspective that river-estuary systems are influenced by effects of climate change operating on both watersheds and oceans; (2) varying sensitivity among environmental indicators to the uncertainty of future climates; (3) inevitability of biological community changes as responses to cumulative effects of climate change and other drivers of habitat transformations; and (4) anticipation and adaptation to the growing probability of ecosystem regime shifts.


[1]  Hansen J, Ruedy R, Sato M, Lo K (2010) Global surface temperature change. Reviews of Geophysics 48: RG4004.
[2]  IPCC (2007) Climate Change 2007 - Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Fourth Assessment Report of the IPCC. Cambridge: Cambridge University Press.
[3]  Milly PCD, Betancourt J, Falkenmark M, Hirsch RM, Kundzewicz ZW, et al. (2008) Climate change. Stationarity is dead: Whither water management? Science 319: 573–574.
[4]  Rahmstorf S (2010) A new view on sea level rise. Nature Reports Climate Change 4: 44–45.
[5]  Knutson TR, McBride JL, Chan J, Emanuel K, Holland G, et al. (2010) Tropical cyclones and climate change. Nature Geoscience 3: 157–163.
[6]  Schneider P, Hook SJ (2010) Space observations of inland water bodies show rapid surface warming since 1985. Geophysical Research Letters 37: L22405.
[7]  Kaushal SS, Likens GE, Jaworski NA, Pace ML, Sides AM, et al. (2010) Rising stream and river temperatures in the United States. Frontiers in Ecology and the Environment 8: 461–466.
[8]  Winder M, Schindler DE (2004) Climate change uncouples trophic interactions in an aquatic system. Ecology 85: 3178–3178.
[9]  Boyce DG, Lewis MR, Worm B (2010) Global phytoplankton decline over the past century. Nature 466: 591–596.
[10]  Service RF (2007) Environmental restoration: Delta blues, California style. Science 317: 442–445.
[11]  US Department of Agriculture website. Available: Accessed 2011 Aug 17.
[12]  Bay Delta Conservation Plan website. Available: Accessed 2011 Aug 17.
[13]  Moyle PB, Lund JR, Bennett WA, Fleenor WE (2010) Habitat variability and complexity in the upper San Franciso Estuary. San Francisco Estuary and Watershed Science 8(3): 1–24. Available: Accessed 2011 Aug 17.
[14]  San Francisco Bay Conservation and Development Commission website. Available: Accessed 2011 Aug 17.
[15]  Knowles N (2000) Modeling the Hydroclimate of the San Francisco Bay-Delta Estuary and Watershed [Ph. D]. La Jolla, CA: Scripps Institution of Oceanography, University of California - San Diego.
[16]  Barnett TP, Pierce DW, Hidalgo HG, Bonfils C, Santer BD, et al. (2008) Human-induced changes in the hydrology of the western United States. Science 319: 1080–1083.
[17]  Cayan DR, Kammerdiener SA, Dettinger MD, Caprio JM, Peterson DH (2001) Changes in the onset of spring in the western United States. Bulletin of the American Meteorological Society 82: 399–415.
[18]  Knowles N, Dettinger MD, Cayan DR (2006) Trends in snowfall versus rainfall in the Western United States. Journal of Climate 19: 4545–4559.
[19]  Stewart IT, Cayan DR, Dettinger MD (2005) Changes toward earlier streamflow timing across western North America. Journal of Climate 18: 1136–1155.
[20]  Cayan DR, Bromirski PD, Hayhoe K, Tyree M, Dettinger MD, et al. (2008) Climate change projections of sea level extremes along the California coast. Climatic Change 87: 57–73.
[21]  Cayan DR, Maurer EP, Dettinger MD, Tyree M, Hayhoe K (2008) Climate change scenarios for the California region. Climatic Change 87: 21–42.
[22]  Cayan DR, Luers AL, Franco G, Hanemann M, Croes B, et al. (2008) Overview of the California climate change scenarios project. Climatic Change 87: S1–S6.
[23]  Vermeer M, Rahmstorf S (2009) Global sea level linked to global temperature. Proceedings of the National Academy of Sciences of the United States of America 106: 21527–21532.
[24]  Hayhoe K, Cayan D, Field CB, Frumhoff PC, Maurer EP, et al. (2004) Emissions pathways, climate change, and impacts on California. Proceedings of the National Academy of Sciences of the United States of America 101: 12422–12427.
[25]  Washington WM, Weatherly JW, Meehl GA, Semtner AJ Jr, Bettge TW, et al. (2000) Parallel climate model (PCM) control and transient simulations. Climate Dynamics 16: 755–774.
[26]  Delworth TL, Broccoli AJ, Rosati A, Stouffer RJ, Balaji V, et al. (2006) GFDL's CM2 Global Coupled Climate Models. Part I: Formulation and Simulation Journal of Climate 19: 643–674.
[27]  Theil H (1950) A rank-invariant method of linear and polynomial regression analysis. I Nederlands Akad Wetensch Proc 53: 386–392.
[28]  Sen PK (1968) Estimates of the regression coefficient based on Kendall's Tau. Journal of the American Statistical Association 63: 1379–1389.
[29]  Yue S, Pilon P, Phinney B, Cavadias G (2002) The influence of autocorrelation on the ability to detect trend in hydrological series. Hydrological Processes 16: 1807–1829.
[30]  Meehl GA, Covey C, Delworth TL, Latif M, McAvaney M, et al. (2007) The global coupled model dataset: A new era in climate change research. Bull Amer Meteor Soc 88: 1383–1394.
[31]  Hidalgo H, Dettinger M, Cayan D (2008) Downscaling with constructed analogues—Daily precipitation and temperature fields over the United States. 48 p. California Energy Commission PIER Final Project Report CEC-500-2007-123.
[32]  Maurer EP, Wood AW, Adam JC, Lettenmaier DP, Nijssen B (2002) A long-term hydrologically-based data set of land surface fluxes and states for the conterminous United States. J Clim 15: 3237–3251.
[33]  Cherkauer KA, Bowling LC, Lettenmaier DP (2003) Variable infiltration capacity cold land process model updates. Global Plan Change 38: 151–159.
[34]  Liang X, Lettenmaier DP, Wood EF, Burges SJ (1994) A simple hydrologically based model of land surface water and energy fluxes for general circulation models. J Geophys Res 99: 14415–14428.
[35]  Maurer EP, Hidalgo HG, Das T, Dettinger MD, Cayan DR (2010) The utility of daily large-scale climate data in the assessment of climate change impacts on daily streamflow in California. Hydrol Earth Syst Sci 14: 1125–1138.
[36]  Draper AJ, Munévar A, Arora SK, Reyes E, Parker NL, et al. (2004) CalSim: generalized model for reservoir system analysis. Journal of Water Resources Planning and Management 130(6): 480–489.
[37]  Brekke LDMN, Bahford KE, Quinn NWT, Dracup JA (2004) Climate change impacts uncertainty for water resources in the San Joaquin river basin, California. Journal of the American Water Resources Association 40(1): 149–164.
[38]  Dracup JA, Vicuna S, Leonardson R, Dale L, Hanneman M (2005) Climate Change and Water Supply Reliability. California Energy Commission, PIER Energy-Related Environmental Research, CEC-500-2005-053.
[39]  Vicuna S, Maurer EP, Joyce B, Dracup JA, Purkey D (2007) The Sensitivity of California Water Resources to Climate Change Scenarios. Journal of the American Water Resources Association 43(2): 482–498.
[40]  Anderson J, Chung FI, Anderson M, Brekke L, Easton D, et al. (2008) Progress on incorporating climate change into management of California's water resources. Climatic Change 87,: suppl. 191–108.
[41]  Brekke LD, Maurer EP, Anderson JD, Dettinger MD, Townsley ES, et al. (2009) Assessing reservoir operations risk under climate change. Water Resources Research 45: W04411.
[42]  Knowles N (1996) Simulation and Prediction of Salinity Variability in San Francisco Bay. [Master's Thesis]. La Jolla, CA: University of California, San Diego.
[43]  Peterson D, Cayan D, Dileo J, Noble M, Dettinger M (1995) The role of climate in estuarine variability. American Scientist 83: 58–67.
[44]  van der Wegen M, Jaffe BE, Roelvink JA (2011) Process-based, morphodynamic hindcast of decadal deposition patterns in San Pablo Bay, California, 1856–1887. Journal of Geophysical Research 116: F02008.
[45]  Wright SA, Schoellhamer DH (2004) Trends in the sediment yield of the Sacramento River, California, 1957–2001. San Francisco Estuary and Watershed Science 2(2): 1–14. Available: Accessed 2011 Aug 17.
[46]  Helsel DR, Hirsch RM (1992) Statistical methods in water resources. Amsterdam: Elsevier.
[47]  Wagner R, Stacey MT, Brown L, Dettinger M (2011) Statistical models of temperature in the Sacramento-San Joaquin Delta under climate-change scenarios and ecological implications. Estuaries and Coasts 34: 544–556.
[48]  Bennett WA (2005) Critical assessment of the delta smelt population in the San Francisco Estuary, California. San Francisco Estuary and Watershed Science 3(2): 1–73. Available: Accessed 2011 Aug 17.
[49]  Moyle PB (2002) Inland fishes of California. Berkeley: University of California Press.
[50]  Sommer T, Armor C, Baxter R, Breuer R, Brown L, et al. (2007) The collapse of pelagic fishes in the upper San Francisco Estuary. Fisheries 32: 270–277.
[51]  Swanson C, Reid T, Young PS, Cech JJ (2000) Comparative environmental tolerances of threatened delta smelt (Hypomesus transpacificus) and introduced wakasagi (H. nipponensis) in an altered California estuary. Oecologia 123: 384–390.
[52]  Nobriga ML, Sommer T, Feyrer F, Fleming K (2008) Long-term trends in summertime habitat suitability for delta smelt, Hypomesus transpacificus. San Francisco Estuary and Watershed Science 6(1). Available: Accessed 2011 Aug 17.
[53]  Moyle PB, Baxter RD, Sommer T, Foin TC, Matern SA (2004) Biology and population dynamics of Sacramento Splittail (Pogonichthys macrolepidotus) in the San Francisco Estuary: a review. San Francisco Estuary and Watershed Science 2(2): 1–4. Available: Accessed 2011 Aug 17.
[54]  Sommer T, Harrell B, Nobriga M, Brown R, Moyle P, et al. (2001) California's Yolo Bypass: Evidence that flood control can be compatible with fisheries, wetlands, wildlife, and agriculture. Fisheries 26: 6–16.
[55]  Sommer T, Baxter R, Herbold B (1997) Resilience of splittail in the Sacramento-San Joaquin Estuary. Transactions of the American Fisheries Society 126: 961–976.
[56]  Schoellhamer DH (2011) Sudden clearing of estuarine waters upon crossing the threshold from transport- to supply- regulation of sediment transport as an erodible sediment pool is depleted: San Francisco Bay, 1999. Estuaries & Coasts 34: 885–899.
[57]  CALFED Science Program website. Available: Accessed 2011 Aug 17.
[58]  Dettinger MD, Culberson S (2008) Internalizing climate change — Scientific resource management and the climate change challenges. San Francisco Estuary and Watershed Science 6(2): 1–17. Available: Accessed 2011 Aug 17.
[59]  Nichols FH, Cloern JE, Luoma SN, Peterson DH (1986) The modification of an estuary. Science 231: 567–573.
[60]  Scavia D, Field JC, Boesch DF, Buddemeier RW, Burkett V, et al. (2002) Climate change impacts on US coastal and marine ecosystems. Estuaries 25: 149–164.
[61]  Lehman PW, Teh SJ, Boyer GL, Nobriga ML, Bass E, et al. (2009) Initial impacts of Microcystis aeruginosa blooms on the aquatic food web in the San Francisco Estuary. Hydrobiologia 637: 229–248.
[62]  Paerl HW, Huisman J (2008) Climate. Blooms like it hot. Science 320: 57–58.
[63]  Feyrer F, Newman K, Nobriga M, Sommer T (2010) Modeling the effects of future outflow on the abiotic habitat of an imperiled estuarine fish. Estuaries and Coasts 34: 120–128.
[64]  Winder M, Jassby AD, MacNally R (2011) Synergies between climate anomalies and hydrological modifications facilitate estuarine biotic invasions. Ecology Letters. in press: DOI 10.1111/j.1461-0248.2011.01635.x.
[65]  Petersen JK, Hansen JW, Laursen MB, Clausen P, Carstensen J, et al. (2008) Regime shift in a coastal marine ecosystem. Ecological Applications 18: 497–510.
[66]  Famiglietti JS, Lo M, Ho SL, Bethune J, Anderson KJ, et al. (2011) Satellites measure recent rates of groundwater depletion in California's Central Valley. Geophysical Research Letters 38: L03403.
[67]  California Department of Water Resources website. Available: Accessed 2011 Aug 17.


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