Surface Temperature Inversion Characteristics in Dissimilar Valleys, Yukon Canada

IF 2.7 3区地球科学 Q2 ECOLOGY

Arctic Science Pub Date : 2022-06-02 DOI:10.1139/as-2021-0048

Nicholas C. Noad, P. Bonnaventure

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引用次数: 1

Abstract

Permafrost distribution in high-latitude continental mountains is a product of both latitudinal and elevationally controlled attributes. Frequently occurring surface-based temperature inversions (SBIs) significantly modify surface lapse rates (SLRs) annually. We aim to identify and quantify patterns of SBI characteristics in two proximal yet morphologically and vegetatively dissimilar central Yukon valleys. Elevational transect analysis (ETA) is applied by using sensors in valley bottoms and 100 m upslope to determine in-situ SLRs for the study period (August 2017 – August 2021). SLRs were shown to vary significantly between these dissimilar valleys. Climate reanalysis products (ClimateNA and Globsim) underestimated or almost entirely missed the presence of strong SBIs which produce annual average SLRs that range from 0.46 - 1.2 °C 100 m-1. The magnitude of these hyper-inversions was grossly underpredicted by previous surface air temperature modelling that attempted to account for SBIs across Yukon. Our results support the previously conceptualized framework that strong SBIs influence surface air temperatures and the pattern of permafrost distribution.

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加拿大育空地区不同山谷地表温度反演特征

高纬大陆山区多年冻土带的分布是纬度和海拔共同控制的产物。频繁发生的地表温度逆温(sbi)每年显著改变地表递减率(SLRs)。我们的目的是确定和量化两个近端但形态和营养不同的育空中部山谷的SBI特征模式。在研究期间(2017年8月至2021年8月)，通过使用山谷底部和100米上坡的传感器，应用高程样带分析(ETA)来确定原位单反。在这些不同的山谷之间，单反显示出显著的差异。气候再分析产品(ClimateNA和Globsim)低估或几乎完全忽略了强sbi的存在，这些sbi产生的年平均单反在0.46 - 1.2°C 100 m-1之间。这些超逆温的强度被以前的地表气温模型严重低估，这些模型试图解释育空地区的sbi。我们的研究结果支持了先前概念化的框架，即强sbi影响地表气温和永久冻土分布模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Arctic Science Agricultural and Biological Sciences-General Agricultural and Biological Sciences

CiteScore

5.00

自引率

12.10%

发文量

期刊介绍： Arctic Science is an interdisciplinary journal that publishes original peer-reviewed research from all areas of natural science and applied science & engineering related to northern Polar Regions. The focus on basic and applied science includes the traditional knowledge and observations of the indigenous peoples of the region as well as cutting-edge developments in biological, chemical, physical and engineering science in all northern environments. Reports on interdisciplinary research are encouraged. Special issues and sections dealing with important issues in northern polar science are also considered.