Ecohydrological Variables Underlie Local Moisture Recycling in Mediterranean-Type Climates

IF 3.7 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of Geophysical Research: Biogeosciences Pub Date : 2024-10-24 DOI:10.1029/2024JG008286

Jolanda J. E. Theeuwen, Stefan C. Dekker, Bert V. M. Hamelers, Arie Staal

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Abstract

Mediterranean areas are projected to face increased water scarcity due to global changes. Because a relatively large fraction of the precipitation in Mediterranean areas originates locally, changes at the land surface may further dampen local precipitation. Here, we study the contribution of evaporation to local precipitation for the first time on a scale of approximately 50 km using local evaporation recycling (ELMR) and local precipitation recycling (PLMR), and make a comparison among five Mediterranean climate regions: South West Australia, South West US, central Chile, the Mediterranean Basin, and the Cape region of South Africa. Specifically, this study aims to understand the effects of ecohydrological (dependent on vegetation or the hydrological cycle) and non-ecohydrological variables on ELMR and PLMR. We find that (a) on average, ecohydrological variables correlate more frequently and more strongly to ELMR and PLMR than non-ecohydrological variables; (b) ELMR is large over wet areas and PLMR is large over dry areas; and (c) there are differences in underlying factors of ELMR and PLMR among the regions due to differences in wetness, topography, and land cover. The results suggest that in Mediterranean regions, changes in vegetation cover or the hydrological cycle may strengthen the local water cycle through enhancing ELMR. Finally, ELMR and PLMR help to identify where in Mediterranean regions we might enhance the local water cycle through land cover changes.

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生态水文变量是地中海型气候中当地水分循环的基础

由于全球变化，地中海地区预计将面临更加严重的缺水问题。由于地中海地区很大一部分降水来自当地，地表变化可能会进一步抑制当地降水。在这里，我们首次在大约 50 公里的范围内，利用当地蒸发循环（ELMR）和当地降水循环（PLMR）研究了蒸发对当地降水的贡献，并对五个地中海气候区进行了比较：澳大利亚西南部、美国西南部、智利中部、地中海盆地和南非开普地区。具体而言，本研究旨在了解生态水文变量（取决于植被或水文循环）和非生态水文变量对 ELMR 和 PLMR 的影响。我们发现：(a) 平均而言，与非生态水文变量相比，生态水文变量与 ELMR 和 PLMR 的相关性更频繁、更强烈；(b) 在湿润地区，ELMR 较大，而在干旱地区，PLMR 较大；(c) 由于湿度、地形和土地植被的不同，各地区 ELMR 和 PLMR 的基本因素存在差异。结果表明，在地中海地区，植被覆盖或水文循环的变化可能会通过增强 ELMR 来加强当地的水循环。最后，ELMR 和 PLMR 有助于确定地中海地区哪些地方可以通过改变土地覆盖来加强当地的水循环。

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来源期刊

Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology

CiteScore

6.60

自引率

5.40%

发文量

242

期刊介绍： JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology