欧洲森林当前和未来叶片汞吸收通量的空间评估

IF 5.4 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Lena Wohlgemuth, Aryeh Feinberg, Allan Buras, Martin Jiskra
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引用次数: 0

摘要

大气中的汞主要通过植被吸收沉积到地表。叶片气孔气体交换对植被净吸收汞起着重要作用,因为叶片通过气孔吸收汞。在这里,我们使用森林树种叶片汞吸收的经验关系,生成了一个生长季节欧洲森林叶片汞通量的空间高分辨率(1平方公里)图。模拟的森林叶片汞吸收通量为23±12 Mg Hg季节−1,这与文献中先前的估计一致。我们在空间上比较了森林汞通量与化学迁移模型GEOS-Chem的模拟通量,发现总体一致性良好。对于欧洲松林,气孔汞吸收对相对较高的环境水汽压亏缺(VPD)的主要条件敏感。我们测试了之前四个生长季节(199420032015/20172018)和两个气候变化情景(RCP 4.5和RCP 8.5)的总松针汞吸收通量的气孔吸收模型。由此模拟的欧洲松针汞总吸收通量在8.0–9.3 Mg Hg季节−1(min–max)的范围内。在所有调查的生长季节中,欧洲松林针汞吸收通量最低(8 Mg Hg季节−1)与2018年欧洲夏季异常炎热干燥的环境条件有关,这突出了调查通量对长期高VPD的敏感性。我们的结论是,气孔建模对于研究极端气候事件背景下汞沉积的变化特别有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A Spatial Assessment of Current and Future Foliar Hg Uptake Fluxes Across European Forests

A Spatial Assessment of Current and Future Foliar Hg Uptake Fluxes Across European Forests

Atmospheric mercury (Hg) is deposited to land surfaces mainly through vegetation uptake. Foliage stomatal gas exchange plays an important role for net vegetation Hg uptake, because foliage assimilates Hg via the stomata. Here, we use empirical relationships of foliar Hg uptake by forest tree species to produce a spatially highly resolved (1 km2) map of foliar Hg fluxes to European forests over one growing season. The modeled forest foliar Hg uptake flux is 23 ± 12 Mg Hg season−1, which agrees with previous estimates from literature. We spatially compared forest Hg fluxes with modeled fluxes of the chemical transport model GEOS-Chem and find a good overall agreement. For European pine forests, stomatal Hg uptake was shown to be sensitive to prevailing conditions of relatively high ambient water vapor pressure deficit (VPD). We tested a stomatal uptake model for the total pine needle Hg uptake flux during four previous growing seasons (1994, 2003, 2015/2017, 2018) and two climate change scenarios (RCP 4.5 and RCP 8.5). The resulting modeled total European pine needle Hg uptake fluxes are in a range of 8.0–9.3 Mg Hg season−1 (min–max). The lowest pine forest needle Hg uptake flux to Europe (8 Mg Hg season−1) among all investigated growing seasons was associated with unusually hot and dry ambient conditions in the European summer 2018, highlighting the sensitivity of the investigated flux to prolonged high VPD. We conclude, that stomatal modeling is particularly useful to investigate changes in Hg deposition in the context of extreme climate events.

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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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