Predicting Antarctic sea ice is of substantial academic and practical significance.However,current prediction models,including deep learning(DL)-based models,show notable bias in the marginal ice zone.In this study,we...Predicting Antarctic sea ice is of substantial academic and practical significance.However,current prediction models,including deep learning(DL)-based models,show notable bias in the marginal ice zone.In this study,we developed a pure data-driven DL model for predicting the Antarctic austral summer monthly-to-seasonal sea ice concentration(SIC)by incorporating a novel hybrid sea ice edge constraint loss function(HybridLoss).The model is referred to as ASICNet.Independent testing based on the last five years(2019–23)demonstrates that ASICNet with HybridLoss achieves significantly higher skill metrics than without,with a reduced mean absolute error of 0.021 from 0.022,a reduced integrated ice edge error of 1.714×10^(6)from 1.794×10^(6)km^(2),but an increased pattern correlation coefficient of 0.40 from 0.38,although both ASICNet versions outperform dynamical and statistical models.Furthermore,enhanced heat maps were developed to interpret the predictability sources of sea ice within DL-based models,and the results suggest that the predictability of Antarctic sea ice is attributable to factors like the Antarctic Dipole(ADP),Amundsen Sea Low(ASL),and Southern Ocean sea surface temperature(SST),as revealed in previous studies.Thus,ASICNet is an efficient tool for austral summer Antarctic SIC prediction.展开更多
人类起源及演化与地球系统环境演化相互关联的科学研究不仅是传统第四纪研究的关键内容之一,也是当今宜居地球研究的首要问题。文章回顾了黄土高原及邻近地区第四纪地层中发现的重要古人类遗存(包括古人类化石和旧石器)的主要成就,阐述...人类起源及演化与地球系统环境演化相互关联的科学研究不仅是传统第四纪研究的关键内容之一,也是当今宜居地球研究的首要问题。文章回顾了黄土高原及邻近地区第四纪地层中发现的重要古人类遗存(包括古人类化石和旧石器)的主要成就,阐述了前人提出的“黄土石器工业”和“黄土地质考古带”研究思路的萌生和发展历程,介绍了学者们运用黄土-古土壤序列对第四纪不同类型沉积物中埋藏的古人类遗存研究的概况。在此基础上,根据前人的大量资料以及笔者自身数十年积累的第一手调查研究数据,提出了一种新的科学思路:针对“全球变化”研究中的薄弱环节,运用独一无二的中国黄土连续序列的“地圈”优势,去寻找“生物圈”古人类活动的连续“序列性”踪迹,研究古气候古环境演化对古人类生存环境的制约及其反馈等重大科学问题。以新的思路和科学问题为宗旨,运用黄土-古土壤序列标准年代框架标尺,以蓝田地区上陈、公王岭、陈家窝、吉家湾-甘峪-刁寨剖面的含石器或古人类化石的26个黄土-古土壤组合旋回(其中包括21个古土壤层和15个黄土层)为基础数据,初步构建了一个年代大约2.12~0.01 Ma B. P.的较高分辨率的古人类古文化演化序列——“黄土-古土壤-古人类遗存序列”框架,期望为人类演化和黄土环境研究拓展新路。展开更多
基金jointly supported by the National Natural Science Foundation of China(Grant No.42376250)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA19070402).
文摘Predicting Antarctic sea ice is of substantial academic and practical significance.However,current prediction models,including deep learning(DL)-based models,show notable bias in the marginal ice zone.In this study,we developed a pure data-driven DL model for predicting the Antarctic austral summer monthly-to-seasonal sea ice concentration(SIC)by incorporating a novel hybrid sea ice edge constraint loss function(HybridLoss).The model is referred to as ASICNet.Independent testing based on the last five years(2019–23)demonstrates that ASICNet with HybridLoss achieves significantly higher skill metrics than without,with a reduced mean absolute error of 0.021 from 0.022,a reduced integrated ice edge error of 1.714×10^(6)from 1.794×10^(6)km^(2),but an increased pattern correlation coefficient of 0.40 from 0.38,although both ASICNet versions outperform dynamical and statistical models.Furthermore,enhanced heat maps were developed to interpret the predictability sources of sea ice within DL-based models,and the results suggest that the predictability of Antarctic sea ice is attributable to factors like the Antarctic Dipole(ADP),Amundsen Sea Low(ASL),and Southern Ocean sea surface temperature(SST),as revealed in previous studies.Thus,ASICNet is an efficient tool for austral summer Antarctic SIC prediction.
文摘人类起源及演化与地球系统环境演化相互关联的科学研究不仅是传统第四纪研究的关键内容之一,也是当今宜居地球研究的首要问题。文章回顾了黄土高原及邻近地区第四纪地层中发现的重要古人类遗存(包括古人类化石和旧石器)的主要成就,阐述了前人提出的“黄土石器工业”和“黄土地质考古带”研究思路的萌生和发展历程,介绍了学者们运用黄土-古土壤序列对第四纪不同类型沉积物中埋藏的古人类遗存研究的概况。在此基础上,根据前人的大量资料以及笔者自身数十年积累的第一手调查研究数据,提出了一种新的科学思路:针对“全球变化”研究中的薄弱环节,运用独一无二的中国黄土连续序列的“地圈”优势,去寻找“生物圈”古人类活动的连续“序列性”踪迹,研究古气候古环境演化对古人类生存环境的制约及其反馈等重大科学问题。以新的思路和科学问题为宗旨,运用黄土-古土壤序列标准年代框架标尺,以蓝田地区上陈、公王岭、陈家窝、吉家湾-甘峪-刁寨剖面的含石器或古人类化石的26个黄土-古土壤组合旋回(其中包括21个古土壤层和15个黄土层)为基础数据,初步构建了一个年代大约2.12~0.01 Ma B. P.的较高分辨率的古人类古文化演化序列——“黄土-古土壤-古人类遗存序列”框架,期望为人类演化和黄土环境研究拓展新路。
