Holocene sea-surface temperature variability in the Chilean fjord region

Holocene sea-surface temperature variability in the Chilean fjord region
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智利峡湾地区全新世海面温度变化

DOI:
10.1016/j.yqres.2014.07.009
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发表时间:
2014
影响因子:
2.3
通讯作者:
Tiedemann
Tiedemann
中科院分区:
地球科学3区
文献类型:
--
作者:
Caniupán;M.· Lamy;Kaiser;Kilian;Mollenhauer;Sandoval;DeHolz;Pantoja;Wellner;Tiedemann

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本文提供了智利最南端(S)最南端(50-53°)全新世(11-0cal ka BP)由烯酮衍生的海表面温度(SST)的三个新记录。SST估计可能偏向于该地区夏季的温度,正如一大组表层沉积物所揭示的那样。全新世的记录表明,除过去约0.6卡的ka BP外,其余的海温都比现在的海温高。然而,它们并没有表现出智利以北和南极洲记录的早期全新世的最佳温度。这可能是一系列因素所致,包括海平面下降导致较温暖的开阔海域流入减少,较冷和较新鲜的内湾水域平流增强,以及更强的西风。在中全新世,记录到了高达2.5℃的显著短期变化和以~5cal ka BP为中心的降温,这与南安第斯山脉第一次新冰川推进相吻合。最新的全新世有两次明显的冷事件,分别集中在约0.6和0.25卡BP,即小冰期。这些冷事件在近海记录中的幅度较低,表明内峡湾的SST信号被放大。
Here we provide three new Holocene (11–0 cal ka BP) alkenone-derived sea surface temperature (SST) records from the southernmost Chilean fjord region (50–53°S). SST estimates may be biased towards summer temperature in this region, as revealed by a large set of surface sediments. The Holocene records show consistently warmer than present-day SSTs except for the past ~ 0.6 cal ka BP. However, they do not exhibit an early Holocene temperature optimum as registered further north off Chile and in Antarctica. This may have resulted from a combination of factors including decreased inflow of warmer open marine waters due to lower sea-level stands, enhanced advection of colder and fresher inner fjord waters, and stronger westerly winds. During the mid-Holocene, pronounced short-term variations of up to 2.5°C and a cooling centered at ~ 5 cal ka BP, which coincides with the first Neoglacial glacier advance in the Southern Andes, are recorded. The latest Holocene is characterized by two pronounced cold events centered at ~ 0.6 and 0.25 cal ka BP, i.e., during the Little Ice Age. These cold events have lower amplitudes in the offshore records, suggesting an amplification of the SST signal in the inner fjords.
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发表时间: 2007
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发表时间: 2007
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