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  • 1
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    Sea surface temperature reconstruction for sediment core MD02-2515
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Calculated from TEX86 (Kim et al., 2010); Calculated from UK'37 (Müller et al, 1998); CALYPSO; Calypso Corer; Guaymas Basin; IMAGES VIII - MONA; Marion Dufresne (1995); MD022515; MD02-2515; MD126; Sea surface temperature, annual mean
    Type: Dataset
    Format: text/tab-separated-values, 506 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table 1) Age determination of sediment core MD02-2515
    PANGAEA
    In:  Supplement to: McClymont, Erin L; Ganeshram, Raja S; Pichevin, Laetitia; Talbot, Helen M; van Dongen, Frank H; Thunell, Robert C; Haywood, Alan M; Singarayer, Joy S; Valdes, Paul J (2012): Sea-surface temperature records of Termination 1 in the Gulf of California: Challenges for seasonal and interannual analogues of tropical Pacific climate change. Paleoceanography, 27(2), PA2202, https://doi.org/10.1029/2011PA002226
    Details
    Publication Date: 2023-06-27
    Description: Centennial-scale records of sea-surface temperature and opal composition spanning the Last Glacial Maximum and Termination 1 (circa 25-6 ka) are presented here from Guaymas Basin in the Gulf of California. Through the application of two organic geochemistry proxies, the UK37' index and the TEX86H index, we present evidence for rapid, stepped changes in temperatures during deglaciation. These occur in both temperature proxies at 13 ka (~3°C increase in 270 years), 10.0 ka (~2°C decrease over ~250 years) and at 8.2 ka (3°C increase in 〈200 years). An additional rapid warming step is also observed in TEX86H at 11.5 ka. In comparing the two temperature proxies and opal content, we consider the potential for upwelling intensity to be recorded and link this millennial-scale variability to shifting Intertropical Convergence Zone position and variations in the strength of the Subtropical High. The onset of the deglacial warming from 17 to 18 ka is comparable to a "southern hemisphere" signal, although the opal record mimics the ice-rafting events of the north Atlantic (Heinrich events). Neither the modern seasonal cycle nor El Niño/Southern Oscillation patterns provide valid analogues for the trends we observe in comparison with other regional records. Fully coupled climate model simulations confirm this result, and in combination we question whether the seasonal or interannual climate variations of the modern climate are valid analogues for the glacial and deglacial tropical Pacific.
    Keywords: Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; CALYPSO; Calypso Corer; DEPTH, sediment/rock; Guaymas Basin; IMAGES VIII - MONA; Marion Dufresne (1995); MD022515; MD02-2515; MD126
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Simulated mean climate response to Caspian Sea area change using the Community Earth System Model (CESM1.2.2) (2020)
    PANGAEA
    In:  University of Reading and University of Bremen
    Details
    Publication Date: 2024-04-20
    Description: The Caspian Sea (CS) is the largest inland lake in the world. Large variations in sea level and surface area occurred in the past and are projected for the future. The potential impacts on regional and large-scale hydroclimate are not well understood. Here, we examine the impact of CS area on climate within its catchment and in the wider northern hemisphere. The Community Earth System Model (CESM1.2.2) is used to simulate the climate of four scenarios: (1) larger than present CS area, (2) current area, (3) smaller than present area, and (4) no-CS scenario. The results reveal large changes in the regional atmospheric water budget. Evaporation (E) over the sea increases with increasing area, while precipitation (P) increases over the south-west CS with increasing area. P-E over the CS catchment decreases as CS surface area increases, indicating a dominant negative lake-evaporation feedback. A larger CS area reduces summer surface air temperatures and increases winter temperatures. The impacts extend eastwards, where summer precipitation is enhanced over central Asia and the north-western Pacific region experiences warming with sea ice reduction in winter. Our results also indicate a weakening of the 500-hPa troughs over the northern Pacific with larger CS area. Lastly, we find a thermal response triggers a southward shift of the jet stream in the upper troposphere during summer. Our findings establish that changing CS area results in climate impacts of such scope that CS area variation should be considered for incorporation into climate model simulations, including palaeo and future scenarios.
    Keywords: Area/locality; Binary Object; Binary Object (File Size); Binary Object (Media Type); Caspian Sea; CESM1.2.2 model; Community Earth System Model version 1.2.2 (CESM1.2.2) with Community Atmospheric Model version-5 (CAM5); Drivers of Pontocaspian biodiversity RIse and DEmise; Evaporation; precipitation; PRIDE; subtropical jet
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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