Response of California Current forcing to mid‐Holocene insolation and sea surface temperatures

Diffenbaugh, Noah S.; Ashfaq, Moetasim

doi:10.1029/2006pa001382

Cited by 25 publications

(22 citation statements)

References 38 publications

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“…RegCM3 has been used extensively to study the potential response of regional climate to anthropogenic increases in greenhouse forcing [e.g., Ashfaq et al , 2009; Diffenbaugh et al , 2005; Gao et al , 2008; Gao and Giorgi , 2008; Seth et al , 2007; Trapp et al , 2007; White et al , 2006]. The RegCM3 performance over the contiguous United States has been detailed in a number of previous studies [e.g., Diffenbaugh et al , 2006; Diffenbaugh and Ashfaq , 2007; Rauscher et al , 2008; Walker and Diffenbaugh , 2009]. For this study, RegCM3 data are obtained from simulations with a domain covering the contiguous United States at 25 km horizontal grid spacing and 18 levels in the vertical, with initial and lateral boundary conditions provided by the NASA Finite Volume General Circulation Model (FVGCM) [ Atlas et al , 2005].…”

Section: Methodsmentioning

confidence: 99%

Influence of climate model biases and daily‐scale temperature and precipitation events on hydrological impacts assessment: A case study of the United States

et al. 2010

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[1] The Intergovernmental Panel on Climate Change's Fourth Assessment Report concludes that climate change is now unequivocal, and associated increases in evaporation and atmospheric water content could intensify the hydrological cycle. However, the biases and coarse spatial resolution of global climate models limit their usefulness in hydrological impact assessment. In order to reduce these limitations, we use a high-resolution regional climate model (RegCM3) to drive a hydrological model (variable infiltration capacity) for the full contiguous United States. The simulations cover in the historic period and 2071-2100 in the future (A2) period. A quantile-based bias correction technique is applied to the times series of RegCM3-simulated precipitation and temperature. Our results show that biases in the RegCM3 fields not only affect the magnitude of hydrometeorological variables in the baseline hydrological simulation, but they also affect the response of hydrological variables to projected future anthropogenic increases in greenhouse forcing. Further, we find that changes in the intensity and occurrence of severe wet and hot events are critical in determining the sign of hydrologic change. These results have important implications for the assessment of potential future hydrologic changes, as well as for developing approaches for quantitative impacts assessment.Citation: Ashfaq, M., L. C. Bowling, K. Cherkauer, J. S. Pal, and N. S. Diffenbaugh (2010), Influence of climate model biases and daily-scale temperature and precipitation events on hydrological impacts assessment: A case study of the United States,

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Section: Methodsmentioning

confidence: 99%

Influence of climate model biases and daily‐scale temperature and precipitation events on hydrological impacts assessment: A case study of the United States

et al. 2010

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“…The interaction between atmospheric circulation (the Aleutian Low and North Pacific High) and northeast Pacific sea surface temperature produce climate variations that drive large-scale variations in the composition and distribution of terrestrial ecosystems in CSC (Namias and Cayan, 1981;Trenberth and Hurrell, 1994;Harrison, 2003;Diffenbaugh and Ashfaq, 2007). Strong correlations between marine and continental records from coastal northern California and Oregon have shown that the response time of the two regions to changes in millennial scale climate forcing is similar, and that oceanographic conditions on these time scales have a direct impact on coastal climates (Pisias et al, 2001).…”

Section: Paleoclimate Change In Coastal Southern California and Offshmentioning

confidence: 99%

Pollen-based evidence of extreme drought during the last Glacial (32.6–9.0 ka) in coastal southern California

Heusser

Kirby

Nichols

2015

Quaternary Science Reviews

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a b s t r a c tHigh resolution pollen analyses of sediment core LEDC10-1 from Lake Elsinore yield the first well-dated, terrestrial record of sub-centennial-scale ecologic change in coastal southern California between~32 and 9 ka. In the Lake Elsinore watershed, the initial, mesic montane conifer forests dominated by Pinus, and Cupressaceae with trace amounts of Abies and Picea were replaced by a sequence of multiple, extended severe mega-droughts between~27.5 and~25.5 ka, in which halophytic and xerophytic herbs and shrubs occupied an ephemeral lake. This prolonged and extended dry interval, which corresponds with warm waters offshore, imply strengthening of the North Pacific High and persistent below-average winter precipitation. The subsequent, contrasting monotonic occurrence of montane conifers reflects little variation in cold, mesic climate until~15 ka. Postglacial development of Quercus woodland and chaparral mark the return to more xeric, warmer conditions at this time. A brief reversal at~13.1e~12.1 ka, as reflected by an expansion of Pinus, is correlative with the Younger Dryas and interrupts development of warm, postglacial climate. Subsequent gradual expansion of xeric vegetation post e Younger Dryas denotes the establishment of a winter hydroclimate regime in coastal southern California that is more similar to modern conditions. Pollen-based reconstructions of temperature and precipitation at Lake Elsinore are generally correlative with pollen-based paleoclimatic reconstructions and foraminiferabased sea surface temperatures from Santa Barbara Basin in marine core ODP 893. The conspicuous absence of the~27.5e~25.5 ka glacial "mega-drought" in the Santa Barbara Basin pollen record highlights the sensitivity of Lake Elsinore to hydroclimate change, and thus, the importance of this new record that indicates that mega-drought can occur during the full glacial when climatic boundary conditions and forcings differed substantially from the present.

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“…Cooling of late Holocene SSTs in the Santa Barbara Basin (SBB) has been attributed to a stronger influence of the California Current during the spring, which likely caused an increase in spring upwelling (Barron and Bukry, 2007;Diffenbaugh and Ashfaq, 2007). In particular, the Neogloquadrina pachyderma isotope data reflect the penetration of cool waters of the California Current into the SBB during the spring, leading to greater diatom (opal) productivity Kennett et al (2007).…”

Section: Santa Barbara Basinmentioning

confidence: 99%

Enhanced Late Holocene ENSO/PDO expression along the margins of the eastern North Pacific

Barron

Anderson

2011

Quaternary International

143

158

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a b s t r a c tPacific climate is known to have varied during the Holocene, but spatial patterns remain poorly defined. This paper compiles terrestrial and marine proxy data from sites along the northeastern Pacific margins and proposes that they indicate 1) suppressed ENSO conditions during the middle Holocene between w8000 and 4000 cal BP with a North Pacific that generally resembled a La Niña-like or more negative PDO phase and 2) a climate transition between w4200 and 3000 cal BP that appears to be the teleconnected expression to a more modern-like ENSO Pacific. Compared to modern day conditions, the compiled data suggest that during the middle Holocene, the Aleutian Low was generally weaker during the winter and/or located more to the west, while the North Pacific High was stronger during the summer and located more to the north. Coastal upwelling off California was more enhanced during the summer and fall but suppressed during the spring. Oregon and California sea surface temperatures (SSTs) were cooler. The Santa Barbara Basin had an anomalous record, suggesting warmer SSTs.Late Holocene records indicate a more variable, El Niño-like, and more positive PDO Pacific. The Aleutian Low became more intensified during the winter and/or located more to the east. The North Pacific High became weaker and/or displaced more to the south. Coastal upwelling off California intensified during the spring but decreased during the fall. Oregon and California SSTs became warmer, recording the shoreward migration of sub-tropical gyre waters during the fall, while spring upwelling (cooler SST) increased in the Santa Barbara Basin. The high-resolution proxy records indicate enhanced ENSO and PDO variability after w4000 cal BP off southern California, w3400 cal BP off northern California, and by w2000 cal BP in southwestern Yukon. A progressively northward migration of the ENSO teleconnection during the late Holocene is proposed.

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Response of California Current forcing to mid‐Holocene insolation and sea surface temperatures

Cited by 25 publications

References 38 publications

Influence of climate model biases and daily‐scale temperature and precipitation events on hydrological impacts assessment: A case study of the United States

Influence of climate model biases and daily‐scale temperature and precipitation events on hydrological impacts assessment: A case study of the United States

Pollen-based evidence of extreme drought during the last Glacial (32.6–9.0 ka) in coastal southern California

Enhanced Late Holocene ENSO/PDO expression along the margins of the eastern North Pacific

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