Glacial melting pulses in the Antarctica: Evidence for different responses to regional effects of global warming recorded in Antarctic bivalve shell (Laternula elliptica)
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- Glacial melting pulses in the Antarctica: Evidence for different responses to regional effects of global warming recorded in Antarctic bivalve shell (Laternula elliptica)
- Other Titles
- 남극의 융빙수 펄스: 남극 이매패류 Laternula elliptica에 기록된 지구 온난화 반응
- Woo, Kyung Sik
Lee, Jae Il
Lim, Hyoun Soo
Summerhayes, Colin P.
- Geology; Marine & Freshwater Biology; Oceanography
- Antarctic bivalve shell; Antarctica; Glacier melting; Global warming; Laternula elliptica; Maxwell Bay
- Issue Date
- Woo, Kyung Sik, et al. 2019. "Glacial melting pulses in the Antarctica: Evidence for different responses to regional effects of global warming recorded in Antarctic bivalve shell (Laternula elliptica)". JOURNAL OF MARINE SYSTEMS, 197(1): 103179-103187.
- Meltwater history of the Antarctic bivalve Laternula elliptica in Maxwell Bay, King George Island near the
Antarctic Peninsula was reconstructed during the shell growth. High resolution trace elemental and stable
isotopic compositions along the aragonite outer part of the shell together with growth bands shows that the shell
lived for 9 years with distinct annual cycles. Also oxygen and carbon isotope values reveal the local meltwater
history in Antarctic Peninsula region. More negative oxygen isotope values than the predicted equilibrium values
clearly show that oxygen isotope depletion is due to lower salinity of seawater by glacial melting. This is also
confirmed by the similar trend of low carbon isotope values as well as monitored sea surface salinity values.
Comparing δ18O values of previous results using the same bivalve species, more negative values from the
Antarctic Peninsula (Maxwell Bay) during the austral winter than from East Antarctica (Syowa Coast and Ross
Sea) suggests that perennial glacial melting influenced seawater δ18O composition near the peninsula. Also,
more negative and variable bivalve δ18O values during austral summer indicate that meltwater pulses fluctuated
greatly in the study area. Distinctively different trends in bivalve δ18O profiles between the Antarctic Peninsula
and East Antarctica may reflect differential responses to regional warming with regard to the recent global
warming over the past few decades.
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