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Some notes on the interpretation and reliability of malacological proxies in paleotemperature reconstructions from loess- comments to Obreht et al.'s “A critical reevaluation of paleoclimate proxy records from loess in the Carpathian Basin”
Earth-Science Reviews ( IF 10.8 ) Pub Date : 2021-05-24 , DOI: 10.1016/j.earscirev.2021.103675
Sümegi Pál , Sándor Gulyás

The paper of Obreht et al., 2019 expresses strong criticism of malacothermometer-based summer paleotemperature reconstructions for the southern parts of the Carpathian Basin. Claims are given that malacological data yield anomalously higher temperatures for the glacials and the LGM compared to other proxy data indicating summer temperatures to be well below 15 °C even 10 °C. To support their arguments interpretations are provided on malacological results of two profiles from the region with data presented by depth rather than chronology making the assessment of chronological claims difficult. In this work we aim to pinpoint that their record and interpretations are burdened by potential biases of alleged sampling, stratigraphic misassignment of the samples, high uncertainty of the chronology and others, especially relevant for the LGM part of the profile leading to flawed conclusions. A new chronology for the LGM was also developed to better confine our mollusk data and give further support to our interpretations and tackle potential inconsistencies in accumulations. Besides our malacological data, some other regional proxy records, outputs of global and regional climate models clearly contradict claims that summer temperatures were lower than 10C° during the LGM in the Carpathian Basin. The 10 °C temperature gradient between the northern parts and southern parts of the basin for the LGM claimed by Obreht et al. (2019) also contradict our data showing only a couple of degrees difference. Recent global and regional climate models indicate much warmer conditions with only 3–6 °C lower global temperatures for the LGM than given by older models and claimed by Obreht et al., 2019. When modern summer temperatures of 21–22 °C are considered, the yielded temperatures are perfectly in line with malaco-thermometric mean July temperature values of 15–18 °C reconstructed for the area.



中文翻译:

从黄土到古温度重建中的胶乳作用代理的解释和可靠性的一些注释-Obreht等人的文章“对喀尔巴阡盆地黄土古气候代用记录的重新评估”

Obreht等人在2019年的论文中强烈批评了基于喀尔巴阡盆地南部的基于马拉默温度计的夏季古温度重建。有人声称,与其他代理数据相比,冰川学数据对冰川和LGM产生异常高的温度,表明夏季温度远低于15°C甚至10°C。为了支持他们的论点,对来自该地区的两种剖面的乳酸盐学结果进行了解释,并提供了深度而不是按时间顺序排列的数据,这使得按时间顺序排列的主张难以评估。在这项工作中,我们旨在查明它们的记录和解释受据称采样的潜在偏见,样品的地层分配不当,年代学的高度不确定性以及其他因素的影响,尤其与简介中的LGM部分相关,从而得出错误的结论。还为LGM开发了新的年表,以更好地限制我们的软体动物数据,并进一步支持我们的解释并解决积累中的潜在矛盾。除了我们的冰川学数据外,还有一些其他区域代理记录,全球和区域气候模型的输出明显与喀尔巴阡盆地LGM期间夏季温度低于10°C的说法相矛盾。Obreht等人声称,LGM盆地北部和南部之间的温度梯度为10°C。(2019)也与我们的数据相矛盾,该数据仅显示了几个度差。

更新日期:2021-05-25
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