温带和北方森林日二氧化碳和水汽通量对极端温度和降水的响应

IF 3 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Climate Pub Date : 2023-10-12 DOI:10.3390/cli11100206
Daria Gushchina, Maria Tarasova, Elizaveta Satosina, Irina Zheleznova, Ekaterina Emelianova, Ravil Gibadullin, Alexander Osipov, Alexander Olchev
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引用次数: 0

摘要

北半球中纬度地区的森林生态系统受到频繁的极端天气事件的严重影响。不同的森林生态系统如何应对这些变化是一项重大挑战。本研究旨在评估不同北温带生态系统和大气对极端天气事件(如异常温度和降水)的日净生态系统交换(NEE)和潜热通量(LE)的响应差异。为了实现本研究的主要目标,我们利用了全球和区域FLUXNET数据库中现有的大气湍流通量和气象参数的再分析数据和信息。对高/低温和降水的NEE和LE响应分析表明,温带和北方针叶林通量响应存在较大差异,主要与森林类型、地理位置、区域气候条件和植物物种组成有关。在暖季和寒季,极端高温通常导致所有森林类型的CO2释放增加,其中针叶林的响应最大。暖季气温的下降主要导致二氧化碳吸收量的增加,表明夏季相对较低的气温对光合作用更有利。寒冷季节的极低温不伴有明显的东北东东距平。LE对温度变化的响应全年变化不显著,温度升高导致LE增加,温度降低导致LE减少。对强降水的直接反应是二氧化碳释放的增加和蒸发的减少。强降水的累积效应与暖季的直接效应相反,在土壤水分充足的条件下,由于活植物的光合作用增强,导致CO2吸收量增加。
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The Response of Daily Carbon Dioxide and Water Vapor Fluxes to Temperature and Precipitation Extremes in Temperate and Boreal Forests
Forest ecosystems in the mid-latitudes of the Northern Hemisphere are significantly affected by frequent extreme weather events. How different forest ecosystems respond to these changes is a major challenge. This study aims to assess differences in the response of daily net ecosystem exchange (NEE) of CO2 and latent heat flux (LE) between different boreal and temperate ecosystems and the atmosphere to extreme weather events (e.g., anomalous temperature and precipitation). In order to achieve the main objective of our study, we used available reanalysis data and existing information on turbulent atmospheric fluxes and meteorological parameters from the global and regional FLUXNET databases. The analysis of NEE and LE responses to high/low temperature and precipitation revealed a large diversity of flux responses in temperate and boreal forests, mainly related to forest type, geographic location, regional climate conditions, and plant species composition. During the warm and cold seasons, the extremely high temperatures usually lead to increased CO2 release in all forest types, with the largest response in coniferous forests. The decreasing air temperatures that occur during the warm season mostly lead to higher CO2 uptake, indicating more favorable conditions for photosynthesis at relatively low summer temperatures. The extremely low temperatures in the cold season are not accompanied by significant NEE anomalies. The response of LE to temperature variations does not change significantly throughout the year, with higher temperatures leading to LE increases and lower temperatures leading to LE reductions. The immediate response to heavy precipitation is an increase in CO2 release and a decrease in evaporation. The cumulative effect of heavy precipitations is opposite to the immediate effect in the warm season and results in increased CO2 uptake due to intensified photosynthesis in living plants under sufficient soil moisture conditions.
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来源期刊
Climate
Climate Earth and Planetary Sciences-Atmospheric Science
CiteScore
5.50
自引率
5.40%
发文量
172
审稿时长
11 weeks
期刊介绍: Climate is an independent, international and multi-disciplinary open access journal focusing on climate processes of the earth, covering all scales and involving modelling and observation methods. The scope of Climate includes: Global climate Regional climate Urban climate Multiscale climate Polar climate Tropical climate Climate downscaling Climate process and sensitivity studies Climate dynamics Climate variability (Interseasonal, interannual to decadal) Feedbacks between local, regional, and global climate change Anthropogenic climate change Climate and monsoon Cloud and precipitation predictions Past, present, and projected climate change Hydroclimate.
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