Seasonal temperatures in West Antarctica during the Holocene
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Seasonal temperatures in West Antarctica during the Holocene. / Jones, Tyler R.; Cuffey, Kurt M.; Roberts, William H. G.; Markle, Bradley R.; Steig, Eric J.; Stevens, C. Max; Valdes, Paul J.; Fudge, T. J.; Sigl, Michael; Hughes, Abigail G.; Morris, Valerie; Vaughn, Bruce H.; Garland, Joshua; Vinther, Bo M.; Rozmiarek, Kevin S.; Brashear, Chloe A.; White, James W. C.
I: Nature, Bind 613, Nr. 7943, 12.01.2023, s. 292-297.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Seasonal temperatures in West Antarctica during the Holocene
AU - Jones, Tyler R.
AU - Cuffey, Kurt M.
AU - Roberts, William H. G.
AU - Markle, Bradley R.
AU - Steig, Eric J.
AU - Stevens, C. Max
AU - Valdes, Paul J.
AU - Fudge, T. J.
AU - Sigl, Michael
AU - Hughes, Abigail G.
AU - Morris, Valerie
AU - Vaughn, Bruce H.
AU - Garland, Joshua
AU - Vinther, Bo M.
AU - Rozmiarek, Kevin S.
AU - Brashear, Chloe A.
AU - White, James W. C.
PY - 2023/1/12
Y1 - 2023/1/12
N2 - The recovery of long-term climate proxy records with seasonal resolution is rare because of natural smoothing processes, discontinuities and limitations in measurement resolution. Yet insolation forcing, a primary driver of multimillennial-scale climate change, acts through seasonal variations with direct impacts on seasonal climate(1). Whether the sensitivity of seasonal climate to insolation matches theoretical predictions has not been assessed over long timescales. Here, we analyse a continuous record of water-isotope ratios from the West Antarctic Ice Sheet Divide ice core to reveal summer and winter temperature changes through the last 11,000 years. Summer temperatures in West Antarctica increased through the early-to-mid-Holocene, reached a peak 4,100 years ago and then decreased to the present. Climate model simulations show that these variations primarily reflect changes in maximum summer insolation, confirming the general connection between seasonal insolation and warming and demonstrating the importance of insolation intensity rather than seasonally integrated insolation or season duration(2,3). Winter temperatures varied less overall, consistent with predictions from insolation forcing, but also fluctuated in the early Holocene, probably owing to changes in meridional heat transport. The magnitudes of summer and winter temperature changes constrain the lowering of the West Antarctic Ice Sheet surface since the early Holocene to less than 162 m and probably less than 58 m, consistent with geological constraints elsewhere in West Antarctica(4-7).
AB - The recovery of long-term climate proxy records with seasonal resolution is rare because of natural smoothing processes, discontinuities and limitations in measurement resolution. Yet insolation forcing, a primary driver of multimillennial-scale climate change, acts through seasonal variations with direct impacts on seasonal climate(1). Whether the sensitivity of seasonal climate to insolation matches theoretical predictions has not been assessed over long timescales. Here, we analyse a continuous record of water-isotope ratios from the West Antarctic Ice Sheet Divide ice core to reveal summer and winter temperature changes through the last 11,000 years. Summer temperatures in West Antarctica increased through the early-to-mid-Holocene, reached a peak 4,100 years ago and then decreased to the present. Climate model simulations show that these variations primarily reflect changes in maximum summer insolation, confirming the general connection between seasonal insolation and warming and demonstrating the importance of insolation intensity rather than seasonally integrated insolation or season duration(2,3). Winter temperatures varied less overall, consistent with predictions from insolation forcing, but also fluctuated in the early Holocene, probably owing to changes in meridional heat transport. The magnitudes of summer and winter temperature changes constrain the lowering of the West Antarctic Ice Sheet surface since the early Holocene to less than 162 m and probably less than 58 m, consistent with geological constraints elsewhere in West Antarctica(4-7).
KW - ICE-SHEET
KW - CLIMATE VARIABILITY
KW - GLACIAL CYCLES
KW - ISOTOPIC DIFFUSION
KW - LATE PLEISTOCENE
KW - SEA-LEVEL
KW - CORE
KW - MODEL
KW - INSOLATION
KW - HISTORY
U2 - 10.1038/s41586-022-05411-8
DO - 10.1038/s41586-022-05411-8
M3 - Journal article
C2 - 36631651
VL - 613
SP - 292
EP - 297
JO - Nature
JF - Nature
SN - 0028-0836
IS - 7943
ER -
ID: 345056613