Chasing Interannual Marine Paleovariability

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Paleoceanography and Paleoclimatology Pub Date : 2023-08-01 DOI:10.1029/2023PA004723

K. Thirumalai, C. Maupin

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引用次数: 0

Abstract

Several modes of tropical sea‐surface temperature (SST) variability operate on year‐to‐year (interannual) timescales and profoundly shape seasonal precipitation patterns across adjacent landmasses. Substantial uncertainty remains in addressing how SST variability will become altered under sustained greenhouse warming. Paleoceanographic estimates of changes in variability under past climatic states have emerged as a powerful method to clarify the sensitivity of interannual variability to climate forcing. Several approaches have been developed to investigate interannual SST variability within and beyond the observational period, primarily using marine calcifiers that afford subannual‐resolution sampling plans. Amongst these approaches, geochemical variations in coral skeletons are particularly attractive for their near‐monthly, continuous sampling resolution, and capacity to focus on SST anomalies after removing an annual cycle calculated over many years (represented as geochemical oscillations). Here we briefly review the paleoceanographic pursuit of interannual variability. We additionally highlight recent research documented by Ong et al., (2022, https://doi.org/10.1029/2022PA004483) who demonstrate the utility of Sr/Ca variations in capturing SST variability using a difficult‐to‐sample meandroid coral species, Colpophyllia natans, which is widespread across the Caribbean region and can be used to generate records spanning multiple centuries.

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追逐海洋年际古变率

热带海面温度（SST）的几种变化模式在每年（年际）的时间尺度上运行，并深刻地影响了邻近陆地的季节性降水模式。在持续温室变暖的情况下，SST变化将如何改变，这一问题仍存在很大的不确定性。对过去气候状态下变化的古海洋学估计已成为阐明年际变化对气候强迫的敏感性的一种有力方法。已经开发了几种方法来研究观测期内外的年际SST变化，主要使用提供亚年度分辨率采样计划的海洋钙化仪。在这些方法中，珊瑚骨架的地球化学变化特别有吸引力，因为它们具有近月的连续采样分辨率，并且在去除多年计算的年周期（表示为地球化学振荡）后能够关注SST异常。在这里，我们简要回顾了古海洋学对年际变化的追求。我们还强调了Ong等人（2022，https://doi.org/10.1029/2022PA004483)他们使用一种难以采样的普通珊瑚物种Colpophyllia natans证明了Sr/Ca变化在捕捉SST变化方面的实用性，该物种广泛分布于加勒比海地区，可用于生成跨越多个世纪的记录。

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来源期刊

Paleoceanography and Paleoclimatology Earth and Planetary Sciences-Atmospheric Science

CiteScore

6.20

自引率

11.40%

发文量

107

期刊介绍： Paleoceanography and Paleoclimatology (PALO) publishes papers dealing with records of past environments, biota and climate. Understanding of the Earth system as it was in the past requires the employment of a wide range of approaches including marine and lacustrine sedimentology and speleothems; ice sheet formation and flow; stable isotope, trace element, and organic geochemistry; paleontology and molecular paleontology; evolutionary processes; mineralization in organisms; understanding tree-ring formation; seismic stratigraphy; physical, chemical, and biological oceanography; geochemical, climate and earth system modeling, and many others. The scope of this journal is regional to global, rather than local, and includes studies of any geologic age (Precambrian to Quaternary, including modern analogs). Within this framework, papers on the following topics are to be included: chronology, stratigraphy (where relevant to correlation of paleoceanographic events), paleoreconstructions, paleoceanographic modeling, paleocirculation (deep, intermediate, and shallow), paleoclimatology (e.g., paleowinds and cryosphere history), global sediment and geochemical cycles, anoxia, sea level changes and effects, relations between biotic evolution and paleoceanography, biotic crises, paleobiology (e.g., ecology of “microfossils” used in paleoceanography), techniques and approaches in paleoceanographic inferences, and modern paleoceanographic analogs, and quantitative and integrative analysis of coupled ocean-atmosphere-biosphere processes. Paleoceanographic and Paleoclimate studies enable us to use the past in order to gain information on possible future climatic and biotic developments: the past is the key to the future, just as much and maybe more than the present is the key to the past.