Evaluating potential evapotranspiration methods in a rapidly warming Arctic region, SW Spitsbergen (1983–2023)

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2024-09-21 DOI:10.1016/j.ejrh.2024.101979

Nicole Hanselmann, Marzena Osuch, Tomasz Wawrzyniak, Abhishek Bamby Alphonse

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引用次数: 0

Abstract

Study regions

Hornsund, SW Spitsbergen, Svalbard – area representing atlantic sector of High Arctic

Study focus

Svalbard's warming climate significantly alters its hydrological conditions. Evapotranspiration, a crucial hydrological component, is understudied in this High Arctic environment. In this study, daily potential evapotranspiration (PET) estimates for the period 1983–2023 were calculated using meteorological data from the Polish Polar Station Hornsund (SW Spitsbergen). 11 different PET methods were applied, those include radiation-based, temperature-based, radiation-temperature-based, and combined methods.

New hydrological insights for the region

The results show a large spread in the annual sum of PET ranging from ∼20 mm/y (Kharrufa) through ∼300 mm/y (Penman-Monteith) up to ∼450 mm/y (Abtew). Trends analysis shows different outcomes depending on the length of the averaging period. Using a daily timescale, PET methods tend to show more similar patterns of changes than using monthly timescales. The changes in PET estimates differ between the models, hence classifying PET methods should consider their sensitivity to meteorological changes. PET estimates were compared with pan measurements at a daily time scale in 2022–2023. The Penman method produced the best results in relation to pan measurements. In other cases, despite a relatively high linear correlation, calibration to local conditions is needed to scale the outcomes and limit biases. This study improves understanding of how PET models perform in the rapidly changing High Arctic climate.

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评估迅速变暖的北极地区斯匹次卑尔根西南部的潜在蒸散方法（1983-2023 年）

研究地区霍恩松、斯匹次卑尔根西南部、斯瓦尔巴--代表北极高纬度地区大西洋部分的地区研究重点斯瓦尔巴气候变暖极大地改变了其水文条件。蒸发蒸腾作用是水文的重要组成部分，但对这一北极高纬度环境的研究却很不够。本研究利用波兰霍恩松极地站（斯匹次卑尔根西南部）的气象数据，计算了 1983-2023 年期间的日潜在蒸散量 (PET) 估计值。结果显示，该地区的年潜在蒸散量总和相差很大，从 20 毫米/年（卡鲁法）到 300 毫米/年（彭曼-蒙蒂斯）再到 450 毫米/年（阿布图）。趋势分析显示，平均期的长短不同，结果也不同。使用日时间尺度，PET 方法往往比使用月时间尺度显示出更相似的变化模式。不同模型的 PET 估计值的变化各不相同，因此在对 PET 方法进行分类时应考虑其对气象变化的敏感性。2022-2023 年，PET 估计值与每日时间尺度的平移测量值进行了比较。彭曼方法得出的结果与泛区测量结果相比最好。在其他情况下，尽管线性相关性相对较高，但仍需要根据当地条件进行校准，以扩展结果并限制偏差。这项研究加深了人们对 PET 模型在瞬息万变的北极高纬度气候中的表现的理解。

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

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.